React.js Web Development Company:
Services by Talent-plus-AI Engineers

Hire the elite 1.6% of engineers who combine human talent & AI tools
to outperform both humans and computers in React.js app development.

Award-Winning Human-AI Engineering:
Mastering React.js, One Solution at a Time

Your challenges become our mission, leading to transformative React.js solutions and occasional recognition.
We’re honored to make an impact with our human-AI engineering approach.

Unveiling the Secrets Behind Our
React.js Development Services:
Talent-AI Centaur Engineers

Code & Pepper embraces human–AI cooperation (so-called ‘centaur team’) rather than competition. The remaining challenge is how to distinguish talent from the average.

Our meticulous methodology – encompassing 8 categories, 42 areas, and 64 criteria – precisely defines talent and seniority for our engineers. Through rigorous verification, we confidently assert that our team comprises genuine senior-level talent, with a mere 1.6% of candidates deemed exceptional.

By having our highly skilled engineers harness AI tools, we eliminate the choice between machine-like efficiency and human expertise. Code & Pepper’s engineers expertly integrate AI with human talent, surpassing both humans and computers alone, delivering an unmatched, unified solution.

Hire true talents

Revealing the Outstanding Outcomes: The Elite
1.6% Emerge from Our Selection Process


Throughout a year, we assessed a remarkable 3083 candidates for inclusion on our team.

1 in every 60

Merely 1 out of every 60 candidates prevailed in our stringent technical and soft skills assessment, ultimately joining our outstanding team.

true talents

This signifies that a mere 1.6% of candidates genuinely embody exceptional talent, and as esteemed members of the Code & Pepper team, they stand ready to drive your project to success.

We have worked with Code & Pepper on our platform and they have displayed nothing short of React.js technical knowledge, commitment and overall
project management skills.

Case Study: React.js Development
Services for a Financial Advisor

Client: Aspen by North Capital

Aspen is a Scottish financial advisory tool. It offers investment analytics and an asset management platform for individual investors. By knowing the investors’ risk profile, the application can recommend them the right portfolio.

Code & Pepper built the application and designed the entire user experience, as well as user interface.

We worked closely with the client to create the product the right way. It needed to be simple but very efficient for daily use. Hiring React.js development services company was perfect for achieving this goal.

Read case study
See more case studies

Ready to Cook Up Some Top-Quality
React.js-Powered Software?

Add some spice to your business with
Code & Pepper’s React.js development services.

Olga Pogorzelska
New Business

Comprehensive React.js Services
to Elevate Your Projects

Explore our extensive range of React.js services, tailored to meet diverse needs.
From front-end and web development to staff augmentation, we’ve got you covered.

Ract.js Talents

Benefit from our React.js team augmentation services, granting your business flexible access to skilled engineers enhanced by AI tools. Seamlessly scale your development team with exceptional talent while avoiding the overhead expenses of traditional hiring.

React.js Web

Experience React.js web development efficiency with our expert
talent-AI centaur engineers. We craft engaging, responsive,
high-performance web apps that meet your unique requirements,
providing optimal user experience and driving business growth.

React.js Front-End

Revolutionize your front-end development using React.js and our human-AI centaur engineers. We implement engaging, intuitive interfaces that provide smooth interactions and exceptional user experiences. Rely on our expertise to build bespoke front-end solutions aligned with your goals.

The Technical Skills that
Distinguish Our React.js Team

We hold our React.js developers to high standards, evaluating their
expertise in 18 technical areas across 4 categories. This ensures
team members meet our distinct technical needs, including AI tooling.
Discover the full list of competencies and verification process below.

  1. Tech & Coding
    In the Tech & Coding category, we assess critical skills that directly influence the quality and efficiency of software development. Ensuring proficiency in these areas guarantees that our developers can build robust and maintainable solutions while effectively collaborating with their peers.
    • Frameworks
      & Libraries

      A competent engineer:

      • Has knowledge of popular frameworks and libraries (e.g., Angular, React, Next.js), their features, and optimal use cases
      • Is aware of new solutions introduced in the world of their chosen tool
      • Knows state management libraries and understands when and which library to use depending on the business requirements of the solution
    • TypeScript
      • Has a good understanding of TypeScript (e.g., knows and can use advanced typing)
      • Can explain the relationship between TypeScript and JavaScript
      • Can skillfully use existing types and create new advanced types for the solution
    • Design Patterns
      • Consciously uses established practices and patterns
      • Chooses solutions that ensure ease of maintenance for their written code
    • High-Quality
      • Produces code that is reliable, easy to maintain, reusable, and can be used across different platforms; writes tests that cover various test cases and are independent
      • Knows and applies metrics that demonstrate the good quality of their written code
    • Automated
      • Can write automated tests (unit, integration, end-to-end)
      • Can explain the role of different types of tests in the entire testing pyramid
      • Can (in collaboration with other developers and testers) make and justify decisions about the scope of test automation in various contexts (business, technical, human)
    • Git Knowledge
      • Is proficient with the Git version control system
      • Knows various Git workflows and can suggest the selection of one depending on the context (business, technical, human)
      • Can implement the chosen workflow in a project
    • API Knowledge
      • Understands the purpose, functionality, and usage of REST APIs
      • Knows and can explain the differences between REST and GraphQL APIs, as well as the factors that determine which type of API is a better solution in a given case
  2. Problem
    Evaluating the Problem-Solving category ensures our developers create tailored, effective solutions and tackle complex challenges. This verification guarantees they can adapt to emerging technologies and deliver high-performance applications aligned with business objectives.
    • Performance-Focused

      The engineer with these competencies:

      • Knows and applies concepts related to ensuring front-end performance (e.g., network communication, data loading time, resource management, user interactions, layout, animations)
      • Cares about conversion rates, considering application responsiveness on web and mobile platforms
      • Knows and uses tools to improve front-end performance, such as Lighthouse and Google Chrome Tools
    • Adequate
      • Proposes a solution adequate for current business and technical needs
      • Is not limited to one type of solution/architecture/tool (maintains a healthy distance from specific approaches or tools) and knows when to apply an existing solution or create a custom one
      • Identifies the advantages and disadvantages of various solutions/approaches in different contexts (business, technical, human)
      • Can explain the impact and role of non-functional requirements in selecting an appropriate solution
    • Technical
      • Can diagnose an occurring technical problem in a project and propose a solution for that problem
    • Research
      • Can conduct research on an unknown or previously unused solution or tool
      • Can present the advantages, disadvantages, or risks associated with the analyzed solution and suggest a decision regarding its implementation
  3. Infrastructure
    & Deployment
    Assessing the Infrastructure & Deployment category is crucial to ensure our engineers effectively manage resources, secure applications, and streamline deployments. This verification guarantees they can build and maintain robust, scalable, and efficient infrastructures for our clients’ projects.
    • Infrastructure

      A competent engineer:

      • Can identify and apply best practices for deployment, monitoring, debugging, and scalability of a solution deployed in a production environment
      • Knows various front-end libraries and uses them at the appropriate time
      • Can manage dependency updates in the project, knows versioning methods, and tracks vulnerabilities in used libraries for security gaps
      • Can deploy and manage an application in production at a basic level
    • OS & Network
      • Understands basic concepts related to operating systems, network communication, and takes their impact into account when creating frontend solutions
    • Security
      • Is knowledgeable about and can implement good security practices
      • Can practically implement security requirements
      • Understands data encryption methods in web and mobile applications and the tools required for that
      • Has experience in implementing secure authentication methods
      • Knows how to securely store sensitive data in applications, such as user login details and payment information
    • CI/CD
      • Can configure CI/CD pipelines optimally and compatibly with the adopted solution architecture, git workflow, and deployment method on cloud computing resources (or other server resources)
      • Is knowledgeable about tools and services that can help reduce application maintenance costs, such as alternative hosting solutions and open-source libraries
  4. Business
    & Process
    Evaluating skills in the Business & Process category is essential to ensure our engineers can effectively collaborate with stakeholders, comprehend project objectives, and optimize the development process. This verification confirms that they can adapt to clients’ needs and contribute to a streamlined, agile workflow.
    • Business

      A competent engineer:

      • Can identify areas of business requirements that need refinement
      • Can translate business requirements into technical requirements (propose an appropriate solution and plan its implementation)
    • Software
      • Understands the software development process using agile methodologies
      • Can report issues related to the current process or methodology being used

The Human Touch:
Unveiling the Essence of Our
React.js Engineers’ Excellence

The importance of soft skills cannot be overstated in our talent selection process. We meticulously assess them across well-defined categories and domains, such as teamwork and work ethic, to establish whether an engineer truly operates at a senior level.

If you’re in search of top-notch senior React.js developers, or simply curious about our strategy for evaluating soft skills, read on for more insights.

Hire true talents

The Soft Skills
that Distinguish Our React.js Team

To ensure our React.js developers meet our senior-level requirements,
we assess their soft skills in 11 areas within 2 categories. Below is a
complete list of the competencies we evaluate and how we verify them.

  1. Collaboration Skills
    We highly value soft skills such as effective communication, excellent
    English proficiency, a helpful and mentoring attitude, transparency,
    and openness to feedback in our team members.
    • Communication

      The engineer with these competencies:

      • Can communicate noticed problems and proposals for changes in a balanced, neutral, and unbiased way (does not judge, does not elevate themselves, does not ridicule)
      • Can communicate their own needs and problems in the project (especially difficulties encountered), while maintaining a non-entitlement attitude
      • Can participate in discussions in a way that encourages conversation. Can guide the discussion towards making decisions or defining a course of action
      • Can discuss and explain technical issues to non-technical people Category: Soft Skills/Communication
    • English
      • Can use the English language to a sufficient extent to effectively communicate their needs, noticed problems, and ideas
      • Can converse in English on non-technical topics
    • Helpfulness
      & mentoring
      • Is open to supporting other team members in carrying out their tasks (including being open to pair programming)
      • Can mentor less experienced team members (identify areas that need improvement/development, provide knowledge and best practices, check other people’s work and give constructive feedback)
    • Transparency
      • Can admit to a mistake and does not hide its consequences
      • Can admit to not knowing something or lacking experience
      • Does not hide their intentions and goals (if they affect their work in the team/project)
      • Can openly communicate the factors that affect their efficiency and motivation to work
    • Open
      to feedback
      • Understands the broader context of business needs, technical possibilities, and human potential, and their impact on the team’s work style
  2. Work Ethic and Responsibility
    We prioritize skills such as thoroughness, responsibility, engagement,
    effectiveness, good work organization, and flexibility to ensure
    our team members deliver high-quality work on time
    and adapt to changing needs.
    • Thoroughness

      The engineer with these competencies:

      • Can thoroughly analyze a technical problem and correctly diagnose its cause
      • Can thoroughly analyze a selected solution, approach, or tool and present the method and chances and risks associated with its implementation
    • Responsibility
      • Feels responsible for the tasks entrusted to them and does not evade responsibility for their actions and their consequences
      • Feels responsible for the solution being created and openly communicates the risks associated with the decisions/actions taken on the solution being created (e.g., its quality, safety, ease of maintenance)
    • Engagement
      & proactivity
      • Can proactively report the need for changes in the solution or the way it is being implemented
      • Openly signals problems and risks in the team/project
    • Effectiveness
      • Can effectively carry out the tasks entrusted to them (by completing them independently or engaging other team members)
      • Openly and without unnecessary delay communicates threats (risks), dependencies, and problems that may prevent them from effectively performing their tasks
    • Good work
      • Completes assigned tasks and duties within the agreed-upon timeframe, and communicates openly if unable to meet deadlines, especially when other team members’ work depends on it.
      • Can prioritize their tasks while considering the needs of other individuals or the entire team.
      • Respects the time and work hours of other team members when involving them in tasks or projects.
    • Flexibility
      • Can adjust their work style and communication method to the current team’s needs
      • Can adjust the scope of tasks performed to the team’s needs (while being able to communicate if the scope or frequency of changes has a negative impact on their efficiency and motivation to work — see Transparency)

AI-Driven Innovation:
Elevating Our Engineers’ Mastery

Discover how our engineers harness AI tools to enhance code completion, review, testing, and security. This unparalleled fusion of human talent and AI technology delivers top-notch solutions that surpass expectations and set new industry benchmarks.

Only the most skilled engineers, like our top 1.6%, can effectively steer these tools to achieve the right results, ensuring that our team maintains its position at the cutting edge of innovation.

By investing in exceptional talent, we empower our engineers to create solutions that truly redefine excellence.

Hire Human-AI talents

Empowering Our Engineers with AI Tools:
Unleashing the Synergy of Human-AI Collaboration

Merging human expertise & AI, our talented engineers unlock the power
of AI-enhanced collaboration, mastering complex challenges with
unrivaled efficiency & ingenuity.

  1. AI Tooling
    These AI tools, combined with the expertise of Code & Pepper’s elite 1.6% engineers, enable our Human-AI centaur teams to deliver high-quality, innovative, and reliable FinTech and HealthTech solutions by improving various aspects of the software development process.
    • Code completion and suggestion

      The engineer with AI tooling competencies:

      • Knows tools that use AI to analyse code and suggest code snippets, functions, and variables based on the context in which the user is coding (examples include GitHub Copilot and TabNine).
    • Code analysis
      and review
      • Knows tools that use AI to analyse code and provide feedback on code quality, security, and performance (examples include CodeGuru, CodeClimate, and Snyk).
    • Testing and debugging
      • Knows tools that use AI to help developers create tests, find bugs, and debug code (examples include: Applitools, Functionize, and Diffblue Cover).
    • Enhanced
      • Knows AI-driven security tools that use machine learning to monitor software for potential vulnerabilities and threats (examples include Darktrace and Snyk).

Ready to Elevate Your React.js Development?

Take the first step towards harnessing the power of our elite human-AI centaur engineers.
Get in touch with us today and let’s bring your vision to life,
one efficient web application at a time.

Olga Pogorzelska
New Business

Savor the Flavor of Success:
Why Hire Our React.js Company


Our specialized team brings extensive knowledge and experience to your project, focusing exclusively on TypeScript-related technologies, which obviously include React.js. We don’t try to be masters of everything – we excel at what we do best.

Quick Access to Talents

A React.js-focused development company has an established team of experienced and skilled engineers who are readily available to start working on your project. This can save you time and resources that would have been spent on recruiting and onboarding.

Access to Senior-Level Engineers

A React.js-focused development company typically has a team of senior-level engineers who have a deep understanding of the technology and industry best practices. This can provide you with access to top talent and expertise that you might not have been able to find on your own.

Save Time and Money

By hiring a React.js-focused development company, you can avoid the time and costs associated with recruitment, such as advertising, screening, interviewing, and training.

Flexible Team Scaling

A React.js-focused development company can adjust the team size and composition based on your project requirements. This flexibility allows you to scale up or down as needed without the hassle and risks of hiring and firing employees.

Spice up Your Web App
with More Than Just ReactJS

Having been building software for more than 15 years, we understand you may need different kinds of support: building a product
from end to end, delivering only a certain part of the app, or providing talented tech-specific engineers.
Our ReactJS web development company has it all.

Why Our React.js Development Company
is a Recipe for Success

With 14+ years of experience and a team of over 70 engineering experts, we have built a reputation for delivering top-quality solutions.
Our 4.6 rating score on Clutch is a testament to our commitment to customer satisfaction
and the trust that our clients have in us.

14+ years
on the market

70+ software

4.6 score
on Clutch

Client Reviews
That Are as Sweet as Dessert

The only proof you need is
what people say about our React.js development company.

Christian Schneider Co-founder

Code & Pepper has been very responsive to our business needs from the beginning. When new requirements emerged, they were both fast and diligent to provide us with candidates that fully met our requirements. Having a competent partner by your side is a great help to move quickly as a start-up!

See case study
Alexander Rainey CEO and Founder

I really value Code & Pepper for their proactive attitude, transparency, and detailed attention to security. These are what made the partnership trusted and solid. The product team was always very helpful in explaining all technical matters, along with a project manager who took care of work organisation.

See case study
Aurélien Bonnel Chief Technology Officer
TradeCrediTech (Nimbla)

Code & Pepper provides high-quality, reliable code and designs. Flexible, responsive, and dedicated to client satisfaction: working with their team continues to add a lot of value to the business overall.

See case study

Our Clients Are Backed
by Industry Leaders

Join the ranks of industry taste-makers:
who’s behind our React.js development company.

A Bite of Knowledge:
The Power of React.js

React.js is a powerful and efficient JavaScript library that has become increasingly popular in recent years due to its ability to build high-performance web applications. One of the reasons for its popularity is the virtual DOM feature, which allows React to quickly update the web page without reloading the entire page.

This feature significantly reduces the load on the web server, leading to faster load times and a smoother user experience. Additionally, React’s component-based architecture makes it easy to manage complex user interfaces, enabling developers to reuse and modify existing code to speed up the development process.

How to Create High-Performance React JS Web Apps

At our React JS web development company, we suggest to follow these 3 tips.
1. Optimize rendering by using pure components, memoization, and lazy loading. 2. Minimize bundle size
by code splitting and tree shaking. 3. Profile and optimize the performance of critical user interactions using tools
like Chrome DevTools and React Profiler.

5 Reasons to Choose React.js
for Your Web App Development

Faster performance

React.js has a virtual DOM, which means that it only updates the parts of the website that need to be changed instead of reloading the entire page. This leads to faster load times and a smoother user experience.

Reusable components

React.js allows developers to create reusable components that can be used throughout an application. This not only makes the development process more efficient but also makes it easier to maintain and update the app in the future.


React.js is highly scalable and can handle large and complex applications. It’s also easy to add new features or scale the app as needed, without having to rewrite the entire codebase.

Cross-platform development

React.js can be used to build web, mobile, and desktop applications. This makes it an ideal choice for companies that want to build applications across multiple platforms.

Large community

React.js has a large and active community of developers who are constantly contributing to the framework. This means that there are many resources available online, such as tutorials, documentation, and plugins, that can help developers create high-quality applications.

Frequently Asked Questions
about React.js Technology

Welcome to our FAQ section, where we answer some of the most common questions our clients and partners ask us about React.js development.

Our team of senior-level engineers has extensive experience working with this popular JavaScript library, and we’re happy to share our knowledge and expertise with you. We’ve gathered some of the most frequently asked questions we receive, and we’ve provided detailed answers that will help you better understand how React.js works and how it can benefit your web application. Whether you’re just starting out with React or you’re an experienced developer looking to learn more about this powerful technology, we hope you’ll find our FAQ section informative and useful.

If you have a question that’s not answered here, feel free to reach out to our team and we’ll be happy to help you.

contact us
  • How does the Virtual DOM work in React, and how does it differ from the traditional DOM?

    In React, the Virtual DOM is an abstraction of the real DOM, which is a representation of the structure and content of an HTML document. When a user interacts with a React app, the Virtual DOM updates first, and then the real DOM is updated based on the changes in the Virtual DOM. This process is called reconciliation and it is triggered by changes to the app’s state or props.

    Compared to the traditional DOM, the Virtual DOM has several advantages.

    • First, it enables efficient updates of the real DOM by minimizing the number of changes that need to be made. Instead of updating the entire DOM tree, React only updates the specific components that have changed, which reduces the amount of computation required and makes the app more performant.
    • Second, the Virtual DOM allows React to work with different platforms, not just web browsers. This means that developers can use React to build native mobile apps, desktop apps, and other types of applications.
    • Third, the Virtual DOM provides a more intuitive programming model for building complex UIs. By representing the UI as a tree structure, developers can more easily reason about the relationships between different components and their state. This helps to reduce bugs and makes it easier to maintain and scale the app over time.
  • Can you explain the concept of “props” in React and how they are used to pass data between components?

    In React, “props” (short for properties) are a way to pass data between components. Props are read-only and are passed down from parent components to child components. They allow for a more modular and reusable approach to building UIs.

    When a component is rendered, it can be passed one or more props by its parent component. These props can be any JavaScript data type, including strings, numbers, objects, or even functions. The receiving component can then use these props to customize its behavior and rendering based on the values of the props.

    Props can also be used to pass down event handlers, which allow child components to communicate with parent components. This is done by passing a function down as a prop, which can then be called by the child component.

    One of the benefits of using props in React is that it helps to keep components loosely coupled, meaning they are more modular and easier to maintain. Additionally, props can be validated using prop-types, a built-in library that helps ensure that components receive the correct props, which helps to reduce bugs and improve code quality.

  • What are some common lifecycle methods in React, and when are they called during a component’s lifecycle?

    In React, lifecycle methods are methods that get called at various points in a component’s lifecycle. Here are some of the most common lifecycle methods and when they are called:

    1. componentDidMount(): This method is called immediately after a component is mounted (i.e., inserted into the DOM). It is often used to fetch data from an API or initialize a third-party library.
    2. shouldComponentUpdate(nextProps, nextState): This method is called before a component is updated. It allows you to determine whether the component should be updated or not, based on changes to its props or state.
    3. componentDidUpdate(prevProps, prevState): This method is called after a component is updated. It is often used to update the component’s state based on the new props, or to interact with the DOM.
    4. componentWillUnmount(): This method is called immediately before a component is unmounted (i.e., removed from the DOM). It is often used to clean up any resources used by the component, such as event listeners.
    5. render(): This method is called whenever a component needs to be rendered. It is the only required lifecycle method, and is responsible for returning the component’s JSX.

    By using these lifecycle methods, you can control the behavior of your React components at various points in their lifecycle. This allows you to create components that are both flexible and powerful.

  • How does React handle state management, and what are some popular third-party libraries or patterns used to manage state?

    In React, state refers to the mutable data that is used to render the user interface. A component’s state can be updated using the setState() method, which triggers a re-render of the component and its children. This ensures that the UI is always up-to-date with the latest data.

    There are several popular third-party libraries and patterns for managing state in React, including:

    • Redux: A predictable state container that provides a centralized location for managing application state. It uses a single store to hold the state, and state mutations are only allowed through actions.
    • MobX: A lightweight state management library that uses observable objects to automatically track dependencies between components and re-render the UI when data changes.
    • Context API: A built-in feature of React that allows data to be passed down the component tree without having to pass props through every level. It can be used for small to medium-sized applications, but may not be ideal for larger, more complex applications.
    • React Hooks: A set of functions that allow state and other React features to be used in functional components, which simplifies state management and reduces the need for class components.

    The choice of state management library or pattern depends on the complexity and size of the application, as well as personal preference and team experience.

  • How can you optimize React performance, and what are some common performance pitfalls to avoid?

    React provides several techniques to optimize performance and improve the user experience. Here are some ways to optimize React performance and avoid common performance pitfalls:

    • Use the Virtual DOM: React’s Virtual DOM is a lightweight representation of the actual DOM. When a component’s state changes, React only updates the necessary part of the Virtual DOM and then compares it with the previous version to determine the minimal set of changes that need to be applied to the actual DOM.
    • Memoization: React provides the memo higher-order component (HOC) that can be used to memoize the result of a component’s rendering function. Memoization can reduce the number of unnecessary re-renders and improve performance.
    • Avoid unnecessary re-renders: Components should only re-render when their state or props change. To avoid unnecessary re-renders, use the shouldComponentUpdate lifecycle method or React’s built-in PureComponent and React.memo.
    • Use React.lazy and Suspense: React.lazy is a built-in function that allows you to load components lazily (i.e., on-demand) and only when they are actually needed. Suspense is a component that can be used to display a fallback UI while the lazily-loaded component is being loaded.
    • Optimize rendering: Avoid rendering large amounts of data at once. Use pagination or infinite scrolling instead. Use key props to help React identify which items have changed and need to be re-rendered.
    • Avoid unnecessary DOM manipulation: Manipulating the DOM is expensive in terms of performance. Use React’s state management and event handling to update the UI instead of manually manipulating the DOM.

    By following these best practices, you can optimize the performance of your React app and provide a faster, more responsive user experience.

contact us

Code & Pepper: The Secret Ingredient
for a Deliciously Performing App with React.js

There’s a difference between mediocrity and a fine product. Contact us for details!

Olga Pogorzelska
New Business