Jobs React.js

The client is a market leader in the provision of employee benefits in the West of Europe.

The scope of the project is : Development, sustaining, testing and support for existing and new software applications, products and platforms.
We are following the client processes in terms of development, testing, product development, security and quality, in order to provide the needed support in maintaining and extending their internal tools.

Must-Have
3+ years recent React Native production experience (not web React)
Shipped apps to App Store and Google Play
TypeScript proficiency
Native module bridging experience (iOS & Android)
Modular architecture / app shell design thinking
State management at scale (Redux, Zustand, etc.)
Mobile CI/CD experience (Fastlane, Bitrise, or similar)
Performance awareness (startup time, bundle size, Hermes)
Ability to mentor engineers transitioning from Flutter
Pragmatic delivery mindset — MVP speed over perfection

Nice-to-Have
Swift/Kotlin basics for native debugging
E2E testing (Detox, Maestro)
OTA updates (CodePush or similar)
Deep linking, push notifications, OAuth/OIDC flows

Soft Skills
Clear architectural communication
Cross-team collaboration (module teams integrate into the shell)
Comfortable with code reviews as a teaching tool
Working proficiency in English

Job Responsibilities

• Take a full ownership of ReactNative development, including mentoring and leading an existing team
• Cooperate with web designers and Product Owner to define user experience and interface
• Close cooperation with customer R&D team on regular basis, full driving of e2e service creation
• Speed up application development, help to improve application performance and infrastructure, move endpoints to use GraphQL
• Write well designed and efficient code by using the best software development practices, participate in code review process

Our Customer:

Our client is a fast-growing cybersecurity technology company developing a large-scale platform for simulating cyberattacks and assessing security posture. The product includes complex web interfaces, high-load backend services, and cloud-native components.

Your Tasks:

• Design, develop, and maintain advanced frontend features using React and modern JavaScript (ES6+).
• Build complex UI components, interactive dashboards, and scalable, reusable component libraries (including Storybook).
• Own and evolve the frontend architecture, ensuring high performance, maintainability, and a consistent user experience across the platform.
• Optimize rendering behavior and application performance, minimizing unnecessary re-renders and improving perceived UI responsiveness.
• Collaborate closely with product managers, designers, and backend engineers to deliver high-quality features end to end.
• Participate in technical discussions, frontend architecture decisions, and code reviews.
• Integrate frontend applications with backend APIs (Node.js-based services).
• Work with Git-based workflows and CI/CD pipelines to ensure smooth delivery and deployment.
• Ensure clean, testable, and well-documented code following frontend best practices.

Required Experience & Skills:

• 5+ years of professional experience in frontend or web development.
• Senior-level expertise in React and the modern frontend ecosystem.
• Excellent command of JavaScript, with a deep understanding of how the language works (execution context, async behavior, data handling).
• Strong experience designing and maintaining reusable UI components and design systems (Storybook or similar).
• Solid understanding of frontend application architecture, state management strategies, and data flow patterns.
• Experience optimizing React applications for performance and scalability.
• Working knowledge of backend integration (REST APIs, Node.js services).
• Experience working with relational and/or NoSQL databases (e.g., PostgreSQL, MongoDB) at an integration level.
• Familiarity with CI/CD pipelines and modern development workflows.
• Strong focus on code quality, testing, and maintainability.
• English — Upper-Intermediate+ (written and spoken).

- 3-5 years of JavaScript game development experience;
- Strong knowledge of HTML5/CSS3;
- Advanced Experience in creating HTML5 games;
- Advanced Javascript ES6+;
- Advanced Experience with some of libraries/frameworks (Phaser, Pixi, Three);
- Strong knowledge of object oriented and functional programming, knowledge of game programming patterns, practices and techniques;
- Understanding of performance optimization algorithms, memory management, threading;
- Good delegation and time management skills
- Problem-solving abilities
- Design highly scalable software solutions to improve functionality and system longevity
- Collaborate with project managers to implement end-to-end solutions for complex projects
- Analyze current systems to maintain integrity and improve architecture
- Train in-house personnel and other end users on software and applications
- Remain informed of current trends and technology developments

Обов'язки

- Creating browser-based HTML5 slot games for desktop and mobile devices;
- Participate in code review and tasks planning activities;
- Participate in discussion with clients on requirements for the game;

Буде плюсом

- Knowledge and practical experience with React;
- Experience with Spine animations;
- Understanding WebGL;

When you join Twin Win Games, you can expect the following perks and benefits:
- Flexible working hours and the freedom to work remotely;
- Paid vacation of 20 workdays/year and 5 workdays/year for sick leaves;
- Unlimited unpaid day-offs to take care of personal matters;
- A range of paid benefits to choose from;
- Personal development plan to support your growth
- Skills training to sharpen your expertise;
- Education office featuring internal and external experts and mentorship programs;
- Structured processes through our corporate confluence;
- Open-minded management style with transparent communication of company strategy and plans;
- Performance-based reviews to recognize and reward your contributions;
- Stress management initiatives, including 1-1 meetings and a feedback culture;
- Engaging in corporate team-building events, marathons, and online challenges;
- Family-friendly policies, including special congratulatory gifts for personal milestones like the birth of a child or a wedding.

If you are an ambitious and enthusiastic professional, always eager to learn and achieve the best results, Twin Win Games is the place for you! We offer ample opportunities for personal development and professional growth. Join us as we continue to create innovative and exciting gaming experiences.

We are seeking a skilled Front-end React Developer who can perform some back-end tasks (Nest.js) if needed. This is a full-time, long-term project with our client from Norway.

‼️ Important: The client would like the developer to come to Norway for onboarding for a few weeks/month (for onboarding, personal introduction). The client will cover all the expenses related to this. ‼️

About the project: The client is working on developing a product for the maritime industry that will analyze and help plan energy-saving measures to reduce fuel use and greenhouse gas emissions and, accordingly, reduce the taxes that ship owners currently pay for their environmental footprint.

Requirements and details:

• Minimum 4 years of experience in software development.
• Experience with the required technologies: React and TypeScript (highest priority); Nest.js comes secondary.
• Experience with Microsoft SQL Server and TypeORM.
• Experience with Azure.
• Minimum Upper-Intermediate level of English.
• Full-time.
• Fully remote.
• Long-term.
• B2B contract.
• Start date — asap.

Frontend (React + TypeScript)

• React patterns: Hooks, composition, controlled/uncontrolled forms, states, and error boundaries.
• Tooling: Vite, ESLint/Prettier, code-splitting, lazy loading, asset optimization, Core Web Vitals, and MUI library.
• API clients: OpenAPI-first workflow; experience with generators like Orval and typed clients.

Backend (NestJS + TypeScript)

• Modular architecture: Modules, providers, DI, guards, interceptors, filters, pipes, and middleware.
• API design: REST standards, versioning, idempotency, pagination, consistent error contracts.
• AuthN/Z: JWT, role/permission models, secure headers

Data & Database

• TypeORM with Microsoft SQL Server (Azure SQL Database): Schema design, relations, migrations, indexing, and query performance.

CI/CD & Cloud

• GitHub Actions: Design and maintain reusable workflows for frontend and backend (build, test, lint), caching, secrets, environments, and required checks on PRs.
• Deployment pipelines: Automated deploys to dev/staging/production, integration of database migrations, basic rollback strategies, and approval gates.
• Azure App Service (Web App): Slot deployments (blue-green/staging), app settings and connection strings, health checks, and basic scaling (scale up/out).
• Azure SQL Database: Environment setup (dev/prod), connection management (firewall rules, private endpoints or equivalent), and backup/restore basics.

Observability, Security & Compliance

• Telemetry: Azure Application Insights logs/metrics/traces, dashboards, and alerting (SLOs/error budgets).

CrunchCode — міжнародна сервісна ІТ-компанія з досвідом близько 7 років у розробці вебсервісів і вебзастосунків. Ми працюємо у форматах staff augmentation (outstaff) та outsourcing і підключаємо спеціалістів до проєктів клієнтів у довгостроковій моделі співпраці.

Ми працюємо переважно з проєктами в доменах логістики (включно з last mile),e-commerce, fintech та банкінгу, а також enterprise-рішеннями.
Для нас важливо, щоб проєкт був “чистим” і зрозумілим з точки зору етики та цінності для користувачів.

Ми принципово не беремо проєкти, пов’язані з:
● gambling / гемблінгом,
● adult-контентом та порнографією,
● шахрайством або будь-якою розробкою, що спрямована на обман чи маніпуляції.

What We Offer:
● Fully remote work
● Long-term, stable project
● High level of autonomy and trust
● Minimal bureaucracy
● Direct impact on business-critical logistics systems
● Long-term engagement, not a short-term contract.

Project Overview:
E-commerce platform (built with Next.js, React, Tailwind, Contex

Requirements (Must-have):
- 5+ years React experience (modern ecosystem)
- Strong Next.js (production apps, data fetching, caching)
- Experience with BFF, APIs, backend workflows
- Knowledge of Redis/caching, performance tuning
- CMS experience (Uniform or similar)
- Strong architecture mindset (scalability, performance, API design)

Responsibilities:
- Improve code quality, propose architecture, and guide best practices
- Coordinate with Design on complex UI changes
- Work with Algolia, Uniform CMS, Salesforce (CloudCraze), SAP integrations
- Build and maintain BFF layer (caching, API orchestration, resiliency)
- Refactor legacy code while balancing delivery timelines
- Handle bug fixing, enhancements, and feature delivery (based on Figma)
- Ensure proper testing before review

Nice to Have:
- Salesforce (CloudCraze) or e-commerce platforms
- Azure DevOps, CI/CD
- Stripe or payment systems
- Algolia

Hiring Process:
- Intro call
- Technical discussion (focused on real experience)
- Offer
Start: ASAP

Senior Frontend Engineer (React)  -  Growth to Frontend Lead
Fintech 
Remote

Russian language proficiency is required for effective communication within the team.
 

COCA is building a next-generation stablecoin banking app that allows users to spend, save, and manage digital dollars in everyday life.
We’re looking for a developer who is motivated to grow into a Frontend Lead role over time.

What you will be doing 

• Lead frontend development for the web platform

• Build and maintain applications using React and TypeScript

• Design and evolve the frontend architecture

• Develop complex product features and user interfaces

• Optimize application performance and rendering

• Integrate frontend with REST APIs

• Maintain and improve the existing codebase, including refactoring legacy code where needed

• Participate in code reviews and contribute to improving overall code quality

• Collaborate with designers, backend engineers, and QA

• Participate in planning and estimation in Agile/Scrum

 

What you’ll need

 

• 5+ years of frontend development experience

• 3 + years of experience with React 

• Strong knowledge of JavaScript and TypeScript

• Solid experience with:React functional components, React Hooks, Context API

• Experience with Storybook

• Experience with Redux or similar state management libraries

• Experience integrating REST APIs

• Strong understanding of frontend architecture and clean code principles

• Solid experience with Git workflows
• Russian and English languages - must have 
• Higher education in Software Engineering, or a related field

Nice to have

• Experience with styled-components or other CSS-in-JS solutions

• Experience with React Hook Form and Zod

• Experience building dynamic components, theming, or UI animations

• Experience developing and maintaining a scalable component library

• Knowledge of Node.js / Express

• Understanding of Docker and CI/CD

• Interest in fintech, crypto, or Web3

Project Description

Our project is a high-impact initiative focused on modernizing and scaling the Data Intelligence platform into a cloud-native, high-availability ecosystem.

Job Description

• 0-1 years of experience in software development with a focus on programming concepts.
• Remote work is expected, allowing for flexibility in your work environment while collaborating with the team.
• Foundational understanding of React and its core principles.

Job Responsibilities

• Assist team members in understanding and documenting key capabilities related to the client platform.
• Support the improvement of data movement across the platform under supervision.
• Learn to build and maintain applications that enhance administrative capabilities.
• Collaborate with other teams to observe best practices in separating key concepts in administrative functions.
• Participate in discussions to grow knowledge and capabilities for future contributions.
• Help in documenting processes and improvements for better clarity.
• Observe and learn from experienced developers in the team.
• Contribute under guidance to ensure alignment with project goals and standards.

We are looking for a senior-level React engineer to own critical frontend experiences, collaborate closely with product and design teams, and help scale a high-growth platform to millions of users.

What you’ll do
• Design, build, and ship high-performance, responsive web UIs
• Partner with product managers, designers, and analysts to translate user needs into elegant product experiences
• Plan and execute short- and long-term roadmaps, balancing user impact, technical quality, and delivery speed
• Raise the bar through code reviews, mentoring, and improvements to our tooling and processes

Must-have expertise
• Next.js (the web app is built with Next.js)
• Monorepos using Yarn Workspaces or Nx
• Tailwind CSS (the primary design system)

Technical requirements
• 5+ years of professional software development experience
• 5+ years of experience with React and its ecosystem (e.g., Redux, React Router)
• Strong proficiency in JavaScript (ES6/ES7) and TypeScript
• Deep knowledge of HTML/CSS, responsive design, and accessibility (a11y) best practices
• Hands-on experience with modern build tooling and package managers (Vite, esbuild, Yarn)
• Experience with server-side rendering and Next.js, plus working knowledge of Node.js
• Comfortable with Git workflows and agile methodologies
• 3+ years of experience working with major cloud providers (AWS/GCP/Azure)
• Experience with Storybook

Nice to have
• Experience with monorepo release management and internal package versioning
• Familiarity with performance profiling, Web Vitals, and SEO in Next.js
• Experience with E2E testing (Playwright/Cypress) and CI/CD pipelines
• Experience building data-heavy, real-time applications

Only React.js devs please apply, fullstacks and other candidates will be ignored.

In connection with the expansion of the company, we are looking for a talented React front-end developer to join our friendly studio team in the Sumy office!

Feel free to contact us — if you are a pro and write code well, you should join us :)

Requirements:

— At least 2 years experience in front-end development (web development only).

— Knowledge of React js (next / ssr) is a must!

— Strong knowledge of TypeScript, JavaScript (ES 6).

— Intermediate level of English.

— Understanding how REST APIs work.

— Knowledge of HTML 5, CSS 3 (styled components).

— Understanding of Svn/Git principles is a must.

— Be able to understand other people’s code.

— Knowledge of Figma/Adobe XD at layout level.

— Punctuality and responsibility, meeting deadlines, willingness to learn new technologies.

We offer:

— work in a stable, dynamically developing company.

— the opportunity to participate in interesting projects, develop professionally and receive good bonuses!

— a great friendly atmosphere in the team, where the team knows how to interact effectively and always strives to give an excellent result!

— flexible schedule from 9 to 18.

Salary — according to the results of the interview, depending on knowledge and experience. Possibility of official registration after the trial period.

Duties:

— Development of the front-end part of mobile projects: creating the architecture of projects, writing the logic of functioning.

— Write cool code, and be the hero of our time :))

— Desire to work and develop further, master mobile technologies.

— Technologies and frameworks: GIT, Node JS, React, React Native, Redux (Saga), Context API, Rest API, WebSocket, SCSS, LESS, Styled-components, Google API, Facebook API, One Signal API, LiqPay API, Express JS, Mongoose.

about projects:

projects from scratch in the field of e-commerce, fintech, transport, etc.

you can cool skills up!

We are looking for a highly experienced Senior Frontend Developer (Electron) with deep expertise in desktop applications to help build a truly high-performance, native-feeling desktop product. This role is for someone who is not just strong in React UI, but who deeply understands the desktop layer itself and knows how to push Electron far beyond a standard web app in a shell.

You will be responsible for bridging product experience with low-level implementation, designing native-feeling interactions, and defining the architecture for how the desktop app interacts with the system. We want a hands-on builder who cares deeply about how windows behave, how performance holds up under pressure, and how to create an experience that feels polished and deeply integrated with the operating system.

Key Responsibilities

• Build and improve a high-performance desktop application using React and Electron.
• Architect system-level interactions, managing IPC boundaries, windowing, and process architecture.
• Design and implement native-feeling desktop experiences across macOS and Windows.
• Develop or integrate native modules to bridge the frontend layer with OS-level capabilities.
• Ensure the UI is sharp, fluid, and production-grade, focusing on responsiveness and smooth interactions.
• Collaborate with engineering and product teams to define the overall desktop architecture and system integration strategies.
• Take ownership of complex engineering problems, troubleshooting performance bottlenecks and resource usage.

Requirements

• 4+ years of frontend engineering experience with a deep mastery of React.
• Strong, hands-on experience building and scaling complex desktop applications with Electron.
• Deep understanding of desktop-native behaviors, window management, and system integrations on macOS and Windows.
• Solid grasp of process architecture, IPC boundaries, permissions, and performance optimization.
• Experience developing or integrating native modules using technologies such as Swift, C++, Rust, or similar.
• Ability to comfortably go below the web layer when needed to ensure correctness and fluidity.
• High ownership, strong engineering judgment, and a passion for building real software, not just shipping surfaces.

Nice to Have

• Experience with low-level system design and OS APIs.
• A strong portfolio of desktop applications demonstrating high UI polish and a native feel.
• Understanding of cryptography fundamentals or security-first engineering.

We offer:

• Participation in a high-impact, global engineering project;
• Long-term engagement with a stable roadmap;
• Competitive compensation;
• Remote-first collaboration model;
• Engineering-driven culture focused on quality, security, and performance.

Recruiting process:

• HR Interview
• Technical Interview with Engineering Team
• Interview with Hiring Manager
• Job offer

What is the purpose of this position?
We are looking for a skilled React Native Developer to join our team and take full responsibility for mobile development. 
Currently, potential clients make many requests, so we want to engage a new specialist on board and provide fast staffing.

Must have skills:

- 4+ years of commercial experience in mobile development, with at least 2 years in React Native.
- Strong understanding of React Native fundamentals, including components, hooks, and state management.
- Familiarity with TypeScript.
- Experience with mobile-specific features like push notifications, permissions, and platform-specific optimizations.
- Familiarity with integrating REST APIs and handling asynchronous data.
- Solid knowledge of mobile app performance optimization and debugging tools.
- Proficiency with Git and version control workflows.
- Upper-Intermediate English level.

Nice to Have:

- Experience with third-party libraries and native modules in React Native
- Knowledge of automated testing frameworks for React Native.

We offer:

— Remote Work Environment. Work from anywhere and be part of a geographically diverse team
— Stay Ahead of the Curve. Work with cutting-edge technologies
— Possibility of payment by FOP, or Payoneer
— Referral & Bonus system
— Paid 12 vacations and 5 sick leaves per year 
— Flexible hours
— Compensation program for purchasing new laptops
— Paid professional certifications & educational courses
— Paid English classes
— Friendly atmosphere with quarterly team buildings
— No bureaucracy

Key Requirements

HTML/CSS/Preprocessors:

• Strong command of HTML5 and CSS3.
• Hands-on experience with SASS, including mixins and style generators.
• Ability to build websites that work smoothly across different browsers, adapt to various screen sizes, and include responsive mobile layouts.

JavaScript/TypeScript:

• Confident use of modern JavaScript (ES6+).
• Solid foundational understanding of TypeScript.
• Competence in handling and managing DOM events.

React & State Management:

• Practical background in developing applications with React.
• Experience applying modern React hooks in real projects.
• Working knowledge of state management tools, including Redux

We are looking for a Front-End Developer (React) to join our team and work on modern web applications for international clients. You will be responsible for building user interfaces, improving existing features, and collaborating closely with designers, backend developers and product managers.

Responsibilities

• Develop and maintain web applications using React
• Build reusable components and scalable frontend architecture
• Implement responsive UI based on Figma designs
• Integrate frontend with backend via REST APIs
• Optimize application performance and user experience
• Participate in code reviews and technical discussions
• Fix bugs and support existing functionality

• Collaborate with cross-functional teams

   

Requirements

• 1.5+ years of commercial experience as a Frontend / React Developer
• Strong knowledge of JavaScript and TypeScript
• Solid experience with React and modern React features (Hooks, Context)
• Experience with state management (Redux, Zustand, MobX, etc.)
• Experience with Next.js
• Understanding of HTML5, CSS3, responsive and cross-browser layout
• Experience working with REST APIs
• Familiarity with UI libraries (MUI, Ant Design, Tailwind CSS, etc.)
• Experience with testing tools (Jest, React Testing Library)
• Experience with Git and common Git workflows
• Ability to work independently and manage own tasks
• English level: Intermediate or higher

Project description

Apiko is looking for a React Native developer to join the team working on a large-scale digital product.

The project is an international sports betting community platform offering real odds from online bookmakers and comprehensive coverage of sports events worldwide. It provides pre-match, live, and post-match coverage, including odds comparison, advanced statistics, live scores, team line-ups, video highlights, and sports news.

Users can make sports picks for fun using real odds, participate in free con

Requirements to candidate

• 3+ years of experience
• Good knowledge of React-Native, Expo, Mobx, Typescript, Unistyles, React-Navigation;
• English: B1 or higher.

Company & benefits description

• Work in a progressive and fast-growing international team with democratic management;
• Smooth onboarding process;
• Competitive salary & regular performance reviews;
• Official long-term employment;
• Healthcare compensation;
• All the necessary equipment provided or additional compensation for your own equipment usage;
• Complete tax compensation & assistance of a personal accountant;
• Comfortable office in the city center in Ternopil or remote work;
• Opportunity to grow professionally and develop your skills.

We are looking for an experienced Team Lead / Senior React Developer to join a fast-growing crypto trading product company. You will take ownership of frontend architecture, lead development efforts, and build high-performance, real-time web applications used by traders worldwide. The role combines hands-on development with technical leadership in a dynamic fintech environment.

Details: 

Employment Type: B2B

Work Mode: Fully Remote

Industry: Crypto / FinTech / Trading Products

Start: ASAP 
English: Fluent 
Ukrainian: Native 

Key Responsibilities

Lead and contribute to the development of a high-performance web trading platform

Design and maintain scalable frontend architecture following best practices

Develop clean, efficient, and maintainable code using JavaScript, TypeScript, and React

Work with real-time streaming data, WebSockets, and REST APIs

Manage application state using Redux and related libraries

Collaborate closely with backend engineers, product managers, and UI/UX designers

Implement UI animations and ensure pixel-perfect design implementation

Optimize performance, debug complex issues, and ensure application stability

Introduce and maintain unit and UI tests to ensure code quality

Take ownership of technical decisions and mentor team members

Required Skills & Experience

7+ years of professional experience in web development

5+ years of experience on a leading position

Strong expertise in JavaScript, TypeScript, and React

Solid knowledge of HTML, CSS, and modern frontend standards

Experience with Redux and common React ecosystem libraries

Strong understanding of RESTful APIs, networking concepts, and WebSockets

Hands-on experience with SignalR for real-time communication

Experience using debugging and monitoring tools such as Sentry

Strong problem-solving skills and attention to performance optimization

Ability to thrive in a fast-paced fintech or product-driven environment

Experience with development of crypto/trading project - MUST!

Nice to Have

Experience with TradingView or similar charting libraries

Background in fintech, trading platforms, or crypto products

Understanding of financial markets and trading workflows

Experience using modern AI tools to improve development speed and productivity

Strong collaboration experience with designers using Figma