Jobs React.js

Are you passionate about building innovative solutions and working with cutting-edge AI technologies? We are looking for a Middle Front-End Developer to join our fully remote team at Sigma Software. You will contribute to the development of advanced AI-powered documentation tools, helping shape the future of intelligent content creation.

At Sigma Software, we value innovation, ownership, and collaboration. This role offers the opportunity to work with global ICT leaders, integrating AI frameworks and agent-based solutions into high-quality front-end applications.

Why join us? You will work in a flexible, remote environment, participate in challenging projects, and enjoy a supportive culture with professional growth opportunities.

Customer

Our customer is a global leader in Information and Communication Technology (ICT), serving telecom service providers worldwide. They deliver cutting-edge products and services for mobile and fixed communication networks, radio systems, and transmission infrastructure. The company is recognized for driving innovation in connectivity and enabling next-generation communication solutions.

Project

The project focuses on developing intelligent documentation solutions powered by AI. Following a successful proof of concept, the current phase involves refining and validating content according to defined writing standards, with automated suggestions and corrections. The main scope centers on front-end development for AI-driven documentation tools, integrating advanced agent-based frameworks and orchestration systems to enhance usability and efficiency.

Key Technologies: React (TypeScript, Vite), Python, LangChain, LangGraph, Aegra, Kiro-CLI, Docker

Responsibility

• Participate in research and development activities for AI-driven documentation solutions
• Take ownership of features from concept to implementation, including front-end development, AI components, and service integrations
• Develop and maintain front-end applications using React (TypeScript, Vite preferred)
• Work with agent-based AI solutions and orchestration frameworks
• Collaborate closely with cross-functional teams, including AI engineers, product managers, and designers
• Attend and actively participate in Agile ceremonies: stand-ups, refinement sessions, sprint planning, and demos

• Ensure high-quality code, maintainability, and adherence to project standards

   

Requirements

• 3+ years of development experience
• Proven experience in front-end development with React (TypeScript, Vite preferred)
• Experience with AI orchestration frameworks and agent-based systems (e.g., LangChain, LangGraph, Aegra)
• Experience with Docker and containerization for deployment
• Track record in AI development and integration with third-party services
• Strong understanding of Agile methodologies and collaborative workflows

• At least Intermediate level of English

   

Will be a plus

• Knowledge of Python for back-end tasks
• Experience with coding agents such as Kiro-CLI (Amazon Q)
• Experience working in fully remote Agile teams
• Proactive attitude with strong ownership and initiative
• Additional AI-related tools or frameworks beyond those listed

NextCRM — We're building a product CRM for e-commerce — a system where businesses manage orders, customers, analytics, and integrations.

What you'll be doing:

• Building complex data-heavy interfaces (tables, filters, bulk actions)
• Designing component architecture and evolving the design system
• Optimizing performance (large lists, SSR/SSG, caching)
• Working with realtime (WebSocket, live updates)
• Making technical decisions with the team, not just "following specs"
• Giving and receiving quality code reviews
•  

What matters to us:

• 5+ years of commercial experience with React
• Solid understanding of Next.js (SSR / SSG / routing)
• TypeScript as a primary tool, not "optional"
• Experience building architecture, not just markup
• Understanding of performance (memo, virtualization, splitting)
• Experience with REST API, WebSocket
• Ability to argue and defend technical decisions
•  

Our stack: React, Next.js, TypeScript, Tailwind, Django REST API

Why us:

• Product, not outsource — you see the result of your code
• Influence on architecture and technical decisions
• Opportunity to build the frontend system "the right way"
• Fast decisions, no bureaucracy

We are looking for a React Native Developer to join our team and help build and improve mobile applications. This is a great opportunity to work on real products, collaborate with a strong team, and grow professionally.
 

Requirements:

- 2+ years of experience with React Native

- Strong knowledge of JavaScript/TypeScript

- Experience with REST APIs integration

- Understanding of mobile app architecture and best practices

- Experience with Git

-  Experience with Expo

Responsibilities:

- Develop and maintain mobile applications using React Native

- Integrate APIs and third-party services

- Collaborate with designers and backend developers

- Debug and improve application performance

- Participate in code reviews and technical discussions

Would be a plus:

- Knowledge of native development (iOS/Android)

- Experience with state management libraries (Redux, Zustand, etc.)

- Experience with CI/CD for mobile apps

- Basic knowledge of Python

Role Overview

We are looking for a performance-driven Frontend Developer to join our core engineering team. You will be responsible for translating high-fidelity designs into modular, high-performance web applications. Your primary focus will be building "Headless" frontends—decoupling the CMS from the presentation layer to create lightning-fast, SEO-optimized user experiences.

Key Responsibilities

• Component Engineering: Build and maintain a robust library of reusable UI components using React, Tailwind CSS, and TypeScript.
• Architecture: Develop scalable frontend architectures using Next.js (App Router), focusing on Server Components and optimized data fetching.
• API Integration: Connect frontends to various data sources (Headless WordPress, Shopify, or Contentful) using GraphQL and REST APIs.
• Performance Optimization: Ensure all projects meet elite Core Web Vitals standards (Lighthouse scores of 90+).
• State & Logic: Implement complex client-side logic for multi-step forms, authentication flows, and interactive search interfaces.

• Accessibility: Ensure all code follows WCAG 2.1 standards to provide inclusive experiences for all users.

   

Technical Requirements

• React & Next.js: 2+ years of professional experience with a deep understanding of hooks, routing, and rendering strategies (SSG, ISR, SSR).
• Modern CSS: Mastery of Tailwind CSS and experience with UI primitives (like Shadcn/UI or Radix UI).
• State Management: Proficiency in Zustand, TanStack Query (React Query), or similar tools for managing server and client state.
• Tooling: Experience with Git/GitHub, Vercel/Netlify deployment workflows, and Figma-to-code workflows.

• Type Safety: Strong experience with TypeScript to ensure code reliability.

   

Preferred Qualifications

• Experience specifically with WPGraphQL and Advanced Custom Fields (ACF).
• Knowledge of SEO best practices for JavaScript-heavy applications.
• Experience integrating payment gateways (Stripe, PayPal) and third-party marketing APIs.

About the Company

We are a European IT company with 200+ specialists delivering SaaS platforms, enterprise solutions, and cloud-native products for clients worldwide. We focus on building strong, long-term teams and supporting continuous professional growth.

About the Internship & Project
We are looking for a motivated Intern Developer to join our team with the opportunity for further employment. You will work on a real project in the telecommunications domain, gaining hands-on experience in a professional environment.

Tech Stack

• Frontend: React, JavaScript, HTML, CSS
• Backend: Laravel 
   

Responsibilities
 

• Develop and maintain frontend features using React
• Collaborate with mentors and team members
• Learn backend basics with Laravel
• Contribute to improving product functionality and user experience

Requirements
 

• Basic knowledge of React and JavaScript (not mandatory commercial experience)
• Basic knowledge of PHP and Laravel (nice to have)
• English level: B2+
• Links to pet projects, GitHub, or course work
   

Why This Internship is Exciting

• Great opportunity to start your career in IT
• Work with experienced developers and mentors
• Gain real-world development experience
• Work with modern technologies

We are looking for a React Native Team Lead to take ownership of the mobile direction and build the architecture of our cross-platform application from the ground up. You will define technical standards, lead mobile development, and collaborate closely with backend engineers, designers, and product managers to deliver a scalable, high-quality mobile product.

Requirements:

• 6+ years of commercial experience in mobile development.
• 4+ years of experience with React Native in production.
• Proven experience as a Tech Lead or Team Lead on mobile projects.
• Strong knowledge of JavaScript (ES6+) and TypeScript.
• Deep understanding of mobile architecture patterns (MVVM, Clean
• Architecture, modular architecture).
• Experience designing and building scalable mobile applications from scratch.
• Strong experience with state management solutions (Redux, Zustand, React Query).
• Experience integrating REST APIs and working with asynchronous data flows.
• Solid understanding of mobile performance optimization and memory management.
• Experience with native modules (iOS/Android) and ability to work with platform-specific code.
• Familiarity with mobile CI/CD pipelines and app release processes (App Store / Google Play).
• Experience with testing (unit, integration, e2e) for mobile applications.
• Strong experience with Git and team collaboration workflows.
• Upper-Intermediate or higher level of English.

Responsibilities:

• Own and define the mobile architecture and technical vision of the product.
• Lead the development of the React Native application from scratch or scale existing solutions.
• Make key technical decisions regarding libraries, structure, and best practices.
• Build and mentor a mobile development team.
• Collaborate with backend, product, and design teams to define and deliver features.
• Ensure high code quality through code reviews and best practices.
• Implement complex mobile features and business logic.
• Optimize application performance, stability, and scalability.
• Establish development processes, CI/CD pipelines, and release workflows.
• Drive continuous improvement and modernization of the mobile codebase.

We offer:

• Competitive salary.
• Remote work format.
• Work on international, production-grade products.
• Salary tied to the dollar exchange rate.
• Influence product and technical decisions at the architectural level.

Build apps that truly make a difference. We're a fresh and ambitious AI studio creating meaningful, in-house products that empower people through better mental health, education, and personal growth. Our work combines human empathy with cutting-edge AI — and we're just getting started.

Role Description

We're looking for a versatile and experienced React Native Frontend Developer to join our passionate, fast-moving team. If you're excited by the idea of building mobile apps that are not just smart but soulfully designed, we want to hear from you.

What you'll do:

• Build and maintain cross-platform mobile apps using React Native and Expo
• Write clean, scalable, and maintainable code with attention to performance
• Work with the Expo toolkit (CLI, Go, EAS Build/Submit) to streamline development and delivery
• Collaborate closely with designers and backend developers to build seamless user experiences
• Integrate with RESTful APIs and backend services
• Use modern state management tools like Redux, Zustand, or Context API
• Build responsive UI components with care for animations and accessibility
• Identify and resolve bugs across platforms and devices
• Stay current with React Native, mobile UI/UX trends, and AI product design
• Contribute to product development through collaboration and experimentation

Qualifications

• 3+ years of professional experience with React Native
• Solid experience with the Expo ecosystem and its tools
• Strong knowledge of JavaScript (ES6+) and TypeScript
• Experience with state management libraries (Redux, Zustand, etc.)
• Comfortable working with REST APIs and modern development tools (Git, npm/yarn)
• Interest in AI-assisted development — experience with AI coding tools (Cursor, GitHub Copilot, or similar) is a plus
• Enthusiasm for building intuitive and well-designed mobile apps
• Strong problem-solving skills and debugging abilities
• Good communication and collaboration skills in a remote-first environment
• A portfolio showcasing React Native work (especially with Expo) is highly valued

What we offer:

• Full-time remote position with flexible schedule
• Work on meaningful AI-powered products that serve real human needs
• Culture of wellness, clarity, and purpose — we move fast, but with intention
• A small, values-driven team where your contributions matter
• The opportunity to build mindful, intelligent tech with lasting impact

Insiders is a fast-growing IT company which employs about 200 people. Our company focused on providing innovative digital services and cutting-edge technologies to solve complex business challenges.

We are located in Lviv and currently work in an office format. For candidates from other cities, we offer relocation (an apartment located near the office, this option is free).

What we expect from the candidate:

- Experience in building responsive user interfaces and designs using HTML/CSS.
- Solid knowledge of JavaScript and React/Next.js.
- Understanding of the latest trends and best practices in front-end development.
- Ability to use dev tools, debugger and package managers (npm, yarn).
- Basic understanding of REST principles.
- Experience with Git.
- Knowledge of how to effectively use GitHub during teamwork.

what we offer:

- free study in our Corporate English Academy

- growth and development opportunities for young developers even if you have no commercial experience

- regular salary review (after the completion of each contract)

- provision of Apple equipment

- comfortable office with all amenities not far from the center (uninterrupted internet, generator, tea and coffee, pastries).

- timely payment of salaries.

- corporate events, teambuildings, etc.

- working on projects side by side with Senior developers, which will give you the opportunity to learn and develop.

Get to know us

Ideals is a global B2B SaaS product company recognized as the most highly rated and customer-centric brand in the secure business collaboration market. Trusted by over 2,000,000 users from 300,000 companies globally, we help people run high-stakes processes and make important decisions with less stress, higher quality, and shorter hours.

Ideals Virtual Data Room (VDR): Secure document sharing and collaboration for due diligence, fundraising, corporate reporting, licensing, clinical trials, and other complex transactions.

Ideals Board: Board and leadership collaboration platform for faster, safer, and more compliant decision-making.

The role

As a Frontend Tech Lead (React), you’ll be a hands-on technical leader in a cross-functional product team building the Ideals Board. You will lead by example in engineering craftsmanship: owning frontend architecture decisions, raising delivery quality, and helping the team move faster with confidence.

What you will do

• Own frontend technical direction for a key area of Ideals Board: architecture, patterns, and long-term maintainability
• Make the design system work properly in real product development: ensure consistency, improve developer experience, and close gaps between design and implementation
• Lead redesigns of key product parts end-to-end (technical + UX): help shape solutions with Product Design and deliver robust implementations
• Raise quality ownership across the team: testing strategy, code review culture, definition of done, and proactive refactoring where it matters
• Drive technical design: write and review technical solutions, identify risks early, and align the team on implementation approaches
• Be a strong hands-on contributor: deliver features, tackle complex tasks, debug production issues, and improve performance and reliability
• Mentor and multiply: coach frontend engineers, share best practices, and grow overall team expertise and collaboration
• Collaborate closely with Product managers, Designers, Backend, QA, and DevOps Engineers to ensure smooth delivery and a great user experience

What you bring

• 6+ years of strong hands-on experience building production web applications with React + TypeScript
• Proven ability to lead technical design: decomposition, trade-offs, and aligning stakeholders on a clear approach
• Experience building or scaling design systems/component libraries, and enforcing consistency in a real product
• Strong engineering fundamentals: maintainability, performance, accessibility, security-minded UI development, and pragmatic quality practices
• Confidence with modern frontend tooling and delivery: testing (unit/integration/e2e), CI/CD, observability, and effective debugging
• Leadership through influence: mentoring, constructive feedback, driving alignment, and creating clarity in ambiguous areas
• A quality mindset: you care about outcomes, user impact, and leaving systems better than you found them

• English at the B2 level

   

Nice to have

• Experience with B2B SaaS products and high-trust environments (security/compliance-sensitive workflows)
• Familiarity with a broader stack and ecosystem (e.g., AWS/Kubernetes, backend integration patterns, API design collaboration)
• Experience running frontend initiatives that span multiple teams (shared components, platform improvements, standards)

What we offer

We highly value our people, so we will empower you with all the resources and support to help you reach your full potential.

For your best work

• Remote-first flexibility to shape your ideal workday
• Home workplace budget
• Resilient home budget for Ukraine-based teammates
• Resilient office in Kyiv & co-working expense coverage
• Individual IT budget for extra equipment
• Top-tier tech and AI-powered tools

For your growth

• Access to Ideals Academy with numerous courses
• Investment in external learning and development activities
• Guidance in Personal Development Plan creation
• Professional literature and subscriptions coverage
• Support of your passion as a speaker or writer
• Internal talent mobility opportunities

For your well-being

• Medical insurance and Wellness Package for sports activities
• Full coverage of mental health sessions for Ukrainian teammates
• Funding for sports competitions
• 20 business days of paid time off per year
• Unlimited health-related time-off

Extra perks

• Budget for meetups with your local team
• Generous internal referral program

Our culture

Commitment, Excellence, Collaboration, Trust and Care are core values to the Ideals team. For us, these are the principles that every Idealer lives and breathes. We are on the lookout for like-minded individuals who share our values. By doing so, we create a team where talents feel at ease and work to the best of their abilities.

Discover more.

Ideals is an equal opportunity employer

Ideals is made up of people from a wide variety of backgrounds and lifestyles. We embrace diversity and invite applications from people from all walks of life. We don’t discriminate against employees or applicants based on gender identity or expression, sexual orientation, race, religion, age, national origin, or citizenship.

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.

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

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

Pixel mindIT is an innovative IT company specializing in software development, web applications, and mobile apps. We bring together a team of professionals who work with the latest technologies. You’ll find a creative approach to solving complex challenges, efficient project management, and a continuous improvement process with us.

Requirements:

- knowledge JavaScript/TypeScript
- еxperience in developing on React.js;
- knowledge of Next.js would be an advantage

- familiarity with Redux/React Redux

- proficient in using Git.
- English level: B1 or higher.
 

What We Offer:
- Flexible working hours.
- A friendly and welcoming work environment in a comfortable office.
- Official employment with a competitive salary based on your experience and skills.
- An exciting opportunity to contribute to innovative projects.