Jobs JavaScript / Front-End

Required Experience/Qualifications 

• 3+ years of experience with JavaScript frontend development 

• Strong knowledge of React and Redux • Hands-on experience with Material UI (MUI v5) and Material Design 3 

• Experience with RESTful APIs and WebSocket-based interactions 

• Familiarity with external charting libraries (e.g., Chart.js, Recharts, etc.) • Good understanding of UI/UX principles and component-based architecture 

• Willingness to work with legacy code during a migration period 

Nice to have: 

• Initiative in introducing testing best practices (e.g., unit/integration tests) 

• Experience with performance tuning and accessibility 

• Familiarity with UI/UX best practices 

• Willingness to learn backend technologies (Go, Gin, Centrifuge) Responsibilities 

• Participate in the migration from Material Design 2 to Material Design 3 • Refactor and improve existing UI components and architecture 

• Implement new UI features and optimize existing ones 

• Collaborate with backend developers to integrate APIs and real-time data 

• Gradually phase out legacy UI while building the new frontend from the ground up 

• Participate in design discussions and propose improvements 

Company Offers 

• Fully remote work setup 

• Competitive compensation 

• 8-hour working day 

• 20 days paid vacation + 8 days paid sick leave 

• Medical insurance 

• Friendly, professional team and long-term project 

About the Project: Johnson Controls is an international developer and manufacturer of high quality electronic security systems and components, operating in Ukraine via its subcontractor in Kyiv. You will join during a critical UI modernization phase, contributing directly to the new user experience aligned with modern design standards.

Required skills experience

JavaScript

About Johnson Controls

Johnson Controls is a global leader in smart, sustainable building solutions, security, and fire protection. With over 140 years of innovation, we develop cutting-edge technologies that enhance efficiency, safety, and comfort in buildings worldwide. Our mission is to create a smarter, healthier, and more sustainable future through intelligent automation and advanced energy solutions.

Hi! We are Liven. We develop a global ecosystem of products that help people gain self-observability and steer away from negative thoughts, patterns, and behaviors on their personal journey.

Inside our ecosystem:

• Self-discovery companion — an app that helps 2.5M users build a deeper relationship with themselves. It’s a space for self-exploration through AI coaching, mood trackers, sound practices, and bite-sized learning.
• Online Coaching — sessions with certified experts to navigate complex life situations.
• Supplements — for physical recovery and bodily support.

Liven is a company for the curious. We are driven by curiosity — an inner need to ask questions, dig deeper, and never stop in the face of the unknown. We are passionate about creating products and solutions that truly help. Our entire culture of experimentation exists to find better ways to support and guide people on their self-discovery journey.

We are looking for a Lead FE Engineer at Liven. You will lead the development of builder solutions and complex automation systems. This is a challenge for those who enjoy creating tools used by others (internal products), where architectural flexibility, performance, and high-load visual editors must be carefully considered.

How Will You Make an Impact?

• Leading a team of developers with different experience levels;
• Participating in product planning;
• Improving and modernizing the frontend infrastructure;
• Growing both technically and from a product perspective;
• Actively contributing to process improvements, the technology stack, and development practices.

What’s Important to Us:

• 5+ years of experience working with JavaScript;
• Leadership experience or a strong desire to grow into a leadership role;
• Understanding and hands-on experience with CI/CD setup and configuration;
• Ability to write unit tests;
• Writing code in compliance with SOLID and GRASP principles;
• Strong experience with TypeScript and writing reliable, well-typed code;
• Experience with other major frontend ecosystems: Vue, Angular, React;
• Ability and willingness to mentor others;
• Writing clear, reliable, and well-thought-out code;
• Conducting constructive and thoughtful code reviews;
• Proposing optimal technical solutions for business needs;
• Managing technical debt and maintaining a healthy balance between product development and refactoring.

What will you enjoy most about being at Liven?

• Culture of Curiosity: a place for explorers who embrace the unknown and achieve stellar results even when there’s no playbook.
• Growth through Impact: your professional evolution is directly tied to the value you bring to the product and the business.
• Global Impact: develop a product that supports the mental well-being of millions of users worldwide every day.
• Trust and Ownership: the freedom to act, coupled with high responsibility for the outcome.
• Expert Community: access to professional clubs, specialized training, a knowledge base, and a library for your continuous learning.
• Space for Focus: autonomous offices in Kyiv and Warsaw with breakfasts, lunches, lounge areas, walking pads, and massage chairs.
• Sports Community: a running club, yoga, boxing, rock climbing, and functional training to keep you energized.
• Medical Insurance and a stable social package.
• Well-being Program: We care about the mental health of our team as much as we care about our users.
• Support during the war: we provide conditions for stable work and contribute to Ukraine’s recovery together.

Still on Day 1: A Constant Expedition

We’ve reached a scale we’re proud of, but inside, we keep the “Day 1” spirit — constantly asking questions, testing hypotheses, and adapting to new contexts. If you are driven by new challenges and want to empower the team with your vision, let’s connect.

Fuel your curiosity at Liven 🔎

This vacancy requires office attendance in Kyiv

Responsibilities

• Development and support of SPA on ReactJS: web version mobile-first of a high-load application, admin panels for internal use, and marketing pages
• Collaborate with other teams to effectively meet the product and technical needs of the project
• Proactively participate in improvements and existing solutions tuning
• Share expertise and knowledge with your teammates

Requirements

• At least 5 years of commercial experience in development in JS (ES6+)/Typescript
• Strong knowledge of CSS, HTML5, SASS, Jest
• At least 2 years of commercial experience in development in with ReactJS version 16+ (hooks)
• Experience with state management frameworks: Redux and Redux toolkit preferred
• Intermediate English

What we offer:

• International company with several offices in different locations : Tel-Aviv, Kyiv, Warsaw, Limassol.
• Granting an Option;
• A professional environment with great people to work with;
• Competitive salary, performance review;
• Flexible working hours, no one here tracks your work time because our culture is built on trust and cooperation;
• Social package, including sports coverage, elite medical insurance for you and family;
• 20 working days paid vacation and 100% sick leaves coverage;
• Opportunities to make a difference, to develop and grow;
• Regular corporate celebrations, team buildings and fun activities;
• Comfortable office close to the metro station. Our Kyiv office is open 24/7 with all safety and health measures in place.

Наш клієнт, Growe, провідна консалтингова компанія та група сервісів у сфері iGaming і розваг. Вони створюють стратегії, що працюють, та рішення, які масштабуються. Поєднуючи стратегічне бачення з практичним досвідом, Growe допомагає бізнесам орієнтуватися в динамічній індустрії, відкривати нові можливості, виходити на нові ринки та досягати сталого зростання.

Ідеально для тих, хто прагне:

• Очолити frontend-команду та визначати технічні рішення;
• Проєктувати та підтримувати frontend-архітектуру, забезпечуючи високу якість коду;
• Обирати, впроваджувати та вдосконалювати технології, стандарти й best practices;
• Проводити code review та менторити розробників;
• Планувати задачі та тісно співпрацювати з продуктом, дизайном і backend-командами;
• Оптимізувати продуктивність інтерфейсу та забезпечувати його стабільність.

Досвід, який стане твоєю перевагою:

• Впевнене володіння JavaScript і TypeScript, глибоке розуміння основ мови;
• Досвід побудови масштабованої та підтримуваної frontend-архітектури;
• Здатність працювати без прив’язки до конкретного фреймворку (framework-agnostic підхід);
• Досвід роботи з Web API, real-time комунікаціями (WebSocket/SSE) та інтеграцією API;
• Ґрунтовне розуміння продуктивності frontend, стабільності та методів оптимізації;
• Досвід проведення code review, менторства та підтримки стандартів якості коду;
• Досвід із SSR або backend-технологіями (наприклад, ASP.NET Core / Razor);
• Досвід роботи з високонавантаженими системами;
• Знання CI/CD інструментів (наприклад, GitLab CI);
• Досвід Tech Lead або керівної ролі (буде плюсом);
• Рівень англійської — Upper Intermediate.

Ми цінуємо:

• Сильні комунікаційні навички та здатність ефективно працювати в команді;
• Сильні навички вирішення проблем та аналітичне мислення;
• Лідерське мислення та здатність менторити й підтримувати інших інженерів;
• Здатність приймати технічні рішення та нести за них відповідальність.

Наші клієнти пропонують конкурентні переваги для підтримки вашого професійного та особистого зростання, зокрема:

• Орієнтація на здоров’я та добробут;
• Глобальне медичне страхування;
• Можливості для зростання;
• Програми бенефітів (компенсація спорту / стоматології / психолога тощо);
• Бонуси за досягнення результатів;
• Динамічне робоче середовище.

Долучайся — і нехай твоя історія зростання розпочнеться.

English version

Our client, Growe, is a leading business advisory and services group in iGaming and Entertainment. Сreators of strategies that work and solutions that scale. Combining strategic vision with hands-on expertise, Growe helps businesses navigate the fast-evolving industry, seize new opportunities, enter new markets, and achieve sustainable growth.

Perfect for those who aim to:

• Lead the frontend team and drive technical decisions;
• Design and maintain frontend architecture, ensuring high code quality;
• Select, implement, and improve technologies, standards, and best practices;
• Review code and mentor developers;
• Plan tasks and collaborate closely with product, design, and backend teams;
• Optimize interface performance and ensure stability.

Experience you’ll need to bring:

• Strong proficiency in JavaScript and TypeScript, with a solid understanding of core language concepts;
• Experience building scalable and maintainable frontend architecture;
• Ability to work without reliance on a specific framework (framework-agnostic mindset);
• Experience with Web APIs, real-time communication (WebSocket/SSE), and API integration;
• Solid understanding of frontend performance, stability, and optimization techniques;
• Experience with code reviews, mentoring, and maintaining code quality standards;
• Experience with SSR or backend-related technologies (e.g., ASP.NET Core / Razor);
• Experience working with high-load systems;
• Familiarity with CI/CD tools (e.g., GitLab CI);
• Previous Tech Lead or leadership experience (nice to have);
• Upper Intermediate level of English.

It’s a perfect match if you have those personal features:

• Strong communication skills and ability to work effectively in a team;
• Leadership mindset with the ability to mentor and support other engineers;
• Strong problem-solving skills and analytical thinking;
• Ability to make technical decisions and take responsibility for them.

Our clients offer competitive benefits to support your professional and personal growth, including:

• Health & Wellness Focus;
• Global Medical Coverage;
• Growth Opportunities;
• Benefits Programs (compensation for the gym/stomatology/psychological service & etc.);
• Performance-Driven Rewards;
• Dynamic Work Environment.

Apply, and let your growth journey begin.

We’re looking for a Senior Front-end Developer to join our team.

This role is for someone who wants to work on WEBSITES with complex animations and interactive experiences.

We’re looking for someone with 8+ years of experience.

You’ll be working from enterprise company websites to immersive microsites and event-based web experiences. You can see examples of our projects here:

https://noomoagency.com/work

Must-haves:

• React
• Zustand (or similar state manager)
• Tailwind (for styling)
• GSAP (for animations)
• Framer Motion (as a possible addition to GSAP)
• Fluent English

On behalf of our Client from Portugal, Mobilunity is looking for a Middle/Senior Frontend Engineer (3D & Graphics) on full-time engagement.

Our Client is building a new digital product with a strong 3D rendering component. Part of a broader initiative to scale digital solutions and establish a Data & AI Center of Excellence. They designs, engineers and manufactures structural connectors, fasteners, anchors, lateral-force resisting systems and related products for wood, steel and concrete construction in residential, commercial and infrastructure markets. The brand is widely recognized as the leading “genuine connector” supplier in North American residential construction and a global leader in structural product solutions.

Key Responsibilities:

• 3D Rendering & Interaction
  — Develop real-time 3D scenes using WebGL/WebGPU and frameworks like Three.js or Babylon.js.
  — Implement intuitive controls (orbit, pan, zoom, snapping, rulers, grids).
  — Optimize rendering for desktop and mobile browsers (LOD, batching, texture compression).
• DIY-Specific Features
  — Build parametric templates (e.g., shelves, tables) with adjustable dimensions.
  — Generate cut lists, bill of materials, and assembly steps from user configurations.
  — Implement exploded views and simple animations for assembly guidance.
• Performance & Accessibility
  — Ensure smooth performance across mid-tier hardware and mobile devices.
  — Apply Web Workers and WASM for heavy computations.
  — Make the 3D UI accessible (keyboard navigation, ARIA roles, color contrast compliance).
• Integration
  — Connect with backend APIs for project persistence and sharing.
  — Enable export to PDF plans.

Required Skills and Experience:

• 3+ years in web-based 3D development.
• Strong proficiency in: JavaScript/TypeScript and Three.js, Babylon.js, or similar frameworks.
• Solid understanding of WebGL/WebGPU, shaders, and 3D math (vectors, matrices, transformations).
• Experience with performance optimization for browser environments.
• Familiarity with responsive design and cross-browser compatibility.

Preferred Qualifications:

• Experience with CSG operations, parametric geometry, or CAD-style modelling is a plus.
• Experience building CAD-lite tools or product configurators.
• Knowledge of procedural geometry, snapping systems, and constraint logic.
• Familiarity with WebAssembly, Web Workers, and GPU profiling.
• Understanding of export pipelines for 3D and printable plans.
• UX experience for touch and mobile-first interactions.

Tech Stack:

• Frontend: TypeScript, React (or similar), Three.js/Babylon.js, WebGL/WebGPU.
• Build Tools: GitHub, ADO, Terraform.
• Testing: Jest/Vitest, Playwright/Cypress.
• Backend Integration: ASP.NET.

In return we offer:

• The friendliest community of like-minded IT-people
• Open knowledge-sharing environment – exclusive access to a rich pool of colleagues willing to share their endless insights into the widest variety of modern technologies.
• Mobilunity Medical Insurance program designed to meet our teams’ needs.
• Paid vacations and sick leaves, including 5 paid days per year that don’t require a sick note.
• Perfect office location in the city center (900m from Lukyanivska metro station with a green and spacious neighborhood) or remote mode engagement: you can choose a convenient one for you, with a possibility to fit together both.
• No open-spaces setup – separate rooms for every team’s comfort and multiple lounge and gaming zones.
• English classes in 1-to-1 & group modes with elements of gamification.
• Neverending fun: sports events, tournaments, music band, multiple affinity groups

Come on board, and let’s grow together!

As a Senior Frontend Developer, you will own the development of a platform layer that integrates HTML5 games into a seamless user experience.

You will design and implement scalable frontend architecture, build high-quality UI components, and ensure performance, responsiveness, and visual polish across the product.

This role requires strong React expertise, architectural thinking, and the ability to work across design, game clients, and backend systems.

Responsibilities

• Design and develop frontend architecture for the game catalog platform
• Build scalable and reusable UI components using React
• Implement responsive and high-performance interfaces
• Integrate with backend services via REST API and WebSockets
• Integrate with game clients via postMessage
• Optimize performance, loading speed, and resource usage
• Collaborate with designers, animators, and backend developers
• Contribute to code quality, architecture decisions, and development standards

Requirements

• 5+ years of commercial experience with modern React
• Strong knowledge of TypeScript, JavaScript, HTML, CSS
• Deep understanding of React ecosystem and frontend architecture
• Experience working with Node.js / NPM ecosystem
• Experience designing scalable frontend systems and components
• Experience integrating with APIs (REST, WebSockets)
• Experience with build tools (Webpack, Vite, Babel)
• Strong experience with Git, GitFlow, CI/CD
• Experience optimizing frontend performance and load times
• Ability to work independently and handle complex tasks

Would Be a Plus

• Experience with Jira, Bitbucket
• Understanding of casino platforms and game integration flows
• Experience with reskins, animations, and localization
• Experience working with game clients or similar interactive systems

What We Offer

• Ownership of frontend architecture for a product-level platform
• Opportunity to influence UI/UX and visual quality standards
• Product-driven environment with global roadmap
• Flexible working format (remote / hybrid, Malta office)
• Competitive compensation and career growth
• Collaboration with an international team of industry professionals

 Responsibilities:

• Write clean, efficient, and well-documented code following established software development standards and best practices
• Develop software applications in line with client requirements
  Participate in the planning, design, and implementation of software projects
• Test and debug applications to ensure they meet defined quality standards
• Collaborate with project managers, designers, and developers to ensure timely and successful project delivery
• Attend relevant technical meetings and provide regular updates to
  stakeholders and team members
• Participate in code reviews and provide constructive feedback to other developers

• Operate and maintain applications within a DevOps model
  
  Requirements:
   

  JavaScript / ADsafe:

• Experience with ADsafe in the context of JavaScript – minimum 3 years
  Frontend (SASS):
• Experience with SASS – minimum 5 years
• Frontend (TypeScript):

• Experience with TypeScript – minimum 5 years

  Testing (Jest):

• Experience with JavaScript testing framework Jest – minimum 5 years
• Test Automation:

• Experience with unit and/or integration testing – minimum 5 years
   

  Industry Experience:

• Experience with information systems in the transportation/logistics
  domain – minimum 5 years

  React:

• Experience within the last 5 years

• Spring Framework:Experience within the last 5 years
   

  Tools (Jira / Confluence):

• Experience with project tracking tools such as Jira Software and Confluence– minimum 5 years
• Agile (Scrum):
• Experience working in agile environments (e.g., Scrum) – minimum 5 years
  RIS-ATIC:

• Experience within the last 5 years –

  Communication Skills:

• Experience in communication and moderation with stakeholders, interface partners, and project teams – minimum 5 years
   

We are looking for a Senior Frontend Engineer to join our client's engineering team in a long-term engagement. This is a fully remote, full-time role for someone who takes real ownership of frontend systems end-to-end, collaborates naturally with backend engineers, and cares deeply about code quality, architecture, and user experience.

You will not be expected to work deeply on backend implementation — but you should be comfortable reading it, understanding it, and integrating cleanly with it.

This role is ideal for someone who enjoys ownership, product thinking, and building scalable, maintainable frontend systems used in real production environments.

Key Responsibilities:

• Architect, develop, and maintain complex frontend applications using React and TypeScript
• Build scalable, reusable UI components and architecture within a monorepo setup

• Own frontend features end-to-end — from requirements and UI logic through to API

  integration and production readiness

• Integrate with NestJS-based APIs, ensuring clean and well-typed contracts
• Drive technical decisions around frontend architecture and long-term maintainability
• Ensure high performance, accessibility, and responsiveness across all applications
• Contribute to shared tooling, libraries, and frontend standards within the monorepo
• Collaborate closely with product managers, designers, and backend engineers
• Improve frontend reliability through testing, code reviews, and engineering best practices

Requirements:

• 7+ years of commercial engineering experience — senior-level candidates only
• Expert-level knowledge of React and TypeScript
• Strong grasp of modern frontend architecture, state management (including xState), and performance optimisation
• Experience in monorepo environments (Nx, Turborepo, or similar)
• Solid understanding of API integration patterns — REST and/or GraphQL — and data flows
• Ability to work independently and deliver consistently in a distributed, remote team
• Excellent English communication skills — written and verbal
• AI-native engineering mindset — you actively use LLMs and AI tooling as part of your everyday development workflow
• Proven track record of long-term, high-impact contributions in previous roles

Nice to Have:

• Experience building AI-powered frontend features — streaming responses, AI chat interfaces, real-time feedback UX, or LLM-integrated workflows
• Familiarity with NestJS or backend service architecture
• Experience in fintech, KYC/KYB, or regulated industry products
• Open-source contribution history

What We Offer:

• Fully remote, flexible work culture with long-term stability
• High-impact product work using modern, state-of-the-art technologies
• Strong engineering standards and real technical ownership — no micromanagement
• Transparent, supportive team culture
• Competitive monthly compensation aligned with experience and contribution

How to Apply:

Send us a short intro about yourself and your relevant experience - and tell us your favourite ice cream flavour (ours is cherry🍒).

Attract Group is an IT service provider developing web/mobile products for European and US-based companies and startups.

We’re looking for a Senior Front-End Developer with Team Lead capabilities to lead a small front-end group across multiple projects.
 

Must-have:

• 5+ years front-end development, React ecosystem as primary stack
• React Native / mobile experience — ability to work across web and mobile projects
• Architecture ownership — can design and defend scalable front-end architecture independently
• Team leadership — experience managing 2-5 frontend developers: code reviews, mentoring, performance accountability
• Estimation & delivery — realistic estimates, ability to hold team to deadlines
• Proactive problem-solving — identifies risks early, escalates blockers, doesn’t wait to be told
• Fast learner — can onboard onto unfamiliar projects/codebases quickly and independently
• Strong TypeScript & modern JS fundamentals
• AI-assisted development (Cursor, Copilot, or similar)
• English — C1+ (daily communication with clients)
   

Nice-to-have:

• Node.js / full-stack capabilities
• CI/CD, automated testing setup
• Experience in outsourcing/agency environment (2-4 projects simultaneously)
• What we expect from the lead role:Own code quality across front-end team
• Make architecture decisions — and explain them to non-technical stakeholders
• Mentor and grow developers, conduct 1:1s
• Push underperformers — don’t avoid hard conversations
• Accurately estimate and distribute work
• Collaborate with PMs, designers, backend team
  
  What We Offer:
• Work on international projects
• Mentorship from co-founders and experienced PMs
• Real growth opportunities up to Project Manager
• A team that values initiative and independence
• Flexible schedule and remote format
• Full-time role with flexible hours after probation
• Ongoing training and educational opportunities
• Performance review once a year
• Competitive salary in USD
• 21 paid vacation days
• 7 paid sick days (+15 for serious cases like COVID or surgery)
• 10 floating public holidays
• Online team-building events & fun corporate activities
• Projects across diverse domains (e-commerce, healthcare, fintech, etc.)
• Clients from the USA, Canada, and Europe.
   

Interview stages:

• AI — Screening
• Interview with a recruiter
• Final Interview C-Level
• Reference check
• Offer

The ideal candidate for us will be responsible for designing client-side and server-side architecture. Build the front-end side of the application/website through appealing visual design. Write effective APIs.

Our ideal candidate is a passionate and hands-on team leader, and mentor, able to create an impact on the design and development of products.
 

DUTIES AND RESPONSIBILITIES

• Take full ownership of your work from the initial design phase through to production
• Develop reusable, stateless and styles components
• Develop and integrate our SDK solution

• Collaborate with the design and backend teams to ensure that the visual design of the app and backend services are in sync with the FE requirements

   

 SKILLS / KNOWLEDGE / ABILITIES
 

• Highly experienced in developing web interfaces in React.js for more than 5 years
• Extended experience with React Native
• Solid Typescript knowledge and experience
• Advanced level and experience with modern React ecosystem (Redux, Redux-Saga)
• Deep understanding and experience with front-end infrastructure tools — webpack, vite, babel, npm, yarn
• Strong Git knowledge
• Strong knowledge of front-end development best practices
• Experience with Scrum
• Excellent and fluent English verbal and written communication skills

NICE TO HAVE

• Has practical developer experience in software testing (Unit Tests, E2E, etc.)
• Experience with CMS systems
• Knowledge of cloud platforms such as AWS, Azure, and related services
• Familiarity with estimation processes and techniques, such as hours/story points
• Airline industry experience is a big plus

GO7 is an Equal Opportunity Employer. All aspects of consideration for employment and employment with the Company are governed on the bases of merit, competence and qualifications without regard to race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, or any other category protected by federal, state, or local law.

If you are looking for a new challenge and feel you have the relevant skills, then don’t miss out. 

In a partnership with a global consulting company we are seeking a versatile Senior Frontend Engineer to join our team and contribute to a large-scale, modular enterprise product.

Our ecosystem is in an active phase of evolution: while our core system is built on Sencha Ext JS (7.5+), we are strategically introducing React for new functional modules and high-performance UI components. The ideal candidate is a "bridge-builder"—an engineer who can navigate both frameworks, leveraging the power of modern React and the Carbon (Client Design System) while maintaining and optimizing our robust Ext JS foundation. The client is a British multinational enterprise software company.

Key Responsibilities

• Modern Feature Development: Build and scale new application modules using React (Hooks, Context API, and modern state management).
• Design System Implementation: Integrate Carbon (Sage Design System) to ensure consistent, accessible, and high-quality user interfaces.
• Enterprise Maintenance: Maintain and enhance existing enterprise modules built with Sencha Ext JS 7.5+ (Classic toolkit) using MVVM architecture.
• Hybrid Integration: Ensure seamless interaction and data flow between React-based components and the existing Ext JS environment.
• UI/UX Translation: Transform complex designs from Figma into responsive layouts using modern CSS (Flexbox, Grid, SASS).
• Performance Optimization: Profile and optimize data-heavy components and complex views across both frameworks.
• Collaborative Engineering: Work closely with backend teams (consuming RESTful APIs/JSON) and QA to deliver high-quality, maintainable code.

Required Skills & Experience

• React Mastery: 3+ years of professional experience with React and its modern ecosystem (Hooks, State Management).
• Ext JS Expertise: Solid experience with Sencha Ext JS (6.5+ / 7.5+), with a strong understanding of component inheritance, stores, models, and the MVVM/MVC lifecycle.
• Core Fundamentals: High proficiency in JavaScript (ES6+), object-oriented design, asynchronous programming, and advanced debugging.
• Modern Styling: Experience with Carbon or similar enterprise UI frameworks; deep knowledge of HTML5, CSS3, and SASS.
• Data Architecture: Proven track record of integrating with RESTful APIs and managing complex state in enterprise-scale applications.
• Workflow: Confidence using Git, package managers (NPM/Yarn), and modern build tools (Webpack/Vite).

Nice to Have

• Experience with TypeScript for large-scale application development.
• Familiarity with Ext JS theming and custom SASS/Compass theme development.
• Domain background in ERP, HRM, or HCM systems with complex user workflows.
• Knowledge of unit testing frameworks like Jest and React Testing Library.

About the role

We are looking for a Senior Full-Stack Developer to join as the first dedicated engineering team member and work directly with the founding team.

This is a hands-on role with strong architectural ownership across multiple production SaaS products. You’ll be involved in shaping system design, building new features, and improving reliability across the stack.

• Workload: 20–30 hours/week initially, with potential to scale

Requirements

• Strong experience with TypeScript (strict mode)
• Solid expertise in React (preferably React 19) and Next.js (App Router)
• Hands-on experience with Supabase (PostgreSQL, RLS, Edge Functions)
• Experience building and maintaining full-stack applications
• Strong understanding of API design, validation, and error handling
• Experience with relational databases, migrations, and query optimization
• Experience working with background jobs / async workflows
• Ability to work in an async, documentation-heavy environment
• Strong ownership mindset and ability to make architectural decisions

Will be a plus

• Experience with multi-tenant SaaS architectures
• Familiarity with Inngest or similar workflow orchestration tools
• Experience with real-time systems, voice or AI integrations
• Experience with Supabase Auth and RLS policies
• Knowledge of Redis (Upstash)
• Experience with Sentry or similar monitoring tools
• Experience integrating third-party APIs (CRM, telephony, etc.)
• Understanding of HIPAA-compliant systems

• Experience with tools like Twilio, Telnyx, Vapi, GoHighLevel, EasyPost

   

Responsibilities

Product Development

• Build new product modules based on architectural specifications
• Implement UI features and fix bugs across dashboards and interfaces
• Develop internal tooling and test harnesses for feature validation

Integrations & Orchestration

• Integrate and manage multiple external providers (AI, voice, APIs)
• Build reliable webhook pipelines (ingest, deduplication, processing)
• Implement CRM and third-party service integrations
• Work on campaign management logic (retry handling, orchestration, etc.)

Backend & Data

• Develop API routes with proper validation and error handling
• Implement background jobs and durable workflows
• Work with database migrations, RLS policies, and RPC functions

Project description

You will work across multiple production SaaS products that share a unified technical stack:

• Primary product (~70%):
  A multi-tenant AI platform for sales intelligence and conversation analytics with active clients and ongoing feature development. This is the most complex system with heavy integration and backend logic.
• Secondary product (~30%):
  A B2B healthcare portal focused on clinic workflows and order routing. The system includes role-based access, audit logging, and integrations with external providers.
• Additional product (as needed):
  An audience intelligence platform that is stable in production, requiring occasional feature updates and maintenance.

Core stack across all projects:
Next.js (App Router), React 19, Supabase (PostgreSQL, RLS, Edge Functions), TypeScript (strict mode), Tailwind CSS.

Hello.

We are looking for a Front-End Team Lead to join Ohayu (https://ohayu.com). We are building the easiest way for travelers to stay online anywhere in the world. We’re a fast-scaling B2C mobile + web app (iOS/Android/Web) that lets people buy eSIM data plans in minutes - cheaper than roaming, no SIM shops, no hassle. Thousands of travelers already use Ohayu worldwide, and we’re just getting started.
Our ambition is bigger than eSIM: we’re evolving Ohayu into a full Travel App that makes every journey smoother.

What you’ll do:

This role is for someone who wants real ownership and real product impact.

• Take full ownership of the frontend architecture and scalability, designing a target architecture to migrate our Preact SPA to Next.js SSR
• Optimize website performance ensuring the fastest load times for users around the world
• Design and implement a robust caching strategy to support global performance at scale
• Add multiple languages to our platform
• Collaborate closely with the design team to translate Figma designs into high-quality, responsive user interfaces and A/B tests
• Improve observability and error handling across the frontend stack
• Refine and implement proper CI/CD pipelines to streamline our development and deployment workflow
• Mentor, support and lead other frontend developers, conducting code reviews and sharing knowledge

What we’re looking for:

• 7+ years of JavaScript experience
• 4+ years of React experience
• 4+ years of Next.js experience (ideally with hands-on work with App Router or Pages Router)
• 3+ years of TypeScript experience
• Proven experience with migration projects - ideally having led or played a key role in SPA to SSR migrations
• Experience deploying and managing applications on Vercel
• Solid knowledge of crash analysis tools and production monitoring
• Experience designing and implementing caching strategies for high-traffic, globally distributed applications
• Familiarity with i18n solutions and adding multi-language support to web platforms
• Experience building and maintaining CI/CD pipelines
• Leadership, mentoring and knowledge-sharing skills; you'll be guiding two mid+ React developers that have some experience with Next.js (13/14)
• At least intermediate English level — all work communication is in English

Why to join us:

• Direct product impact: what you ship gets used immediately by real travelers.
• Ownership: you’re a builder leading the frontend direction.
• Product engineering culture: we care about UX and conversion as much as we care about clean code.
• Fast pace, real learning: constant iterations, clear feedback loops, real-world constraints.
• Genesis ecosystem: access to strong expertise, resources, and networking.
• Benefits: health insurance, 20 paid vacation days, annual performance review with clear salary progression.

Work format: Possibility to work fully remotely or from our offices in Warsaw, Kyiv or Lviv.

Join us in reshaping the future of connectivity.

As a Frontend Engineer at Wix, you’ll work on cutting-edge technologies that make a powerful impact on over 243 million users. You’ll build rich React applications with different state-management paradigms. In your day-to-day, you will:

- Tackle tough problems and find creative ways to solve them

- Write a lot of high-quality, functional Typescript and Javascript

- Work with Git, Node.js, React, Redux, MobX, and ES6+

- Manage and complete tasks using TDD, continuous integration, and modern development processes

- Invest time in personal growth and development

At Wix, we’re all about the flexibility of a hybrid setup — giving you the option to collaborate in the office when needed while also staying connected remotely.
We’re looking for Ukraine-based talents who can balance their time between in-office and remote engagement with the Wix team. This approach gives you the best of both worlds: flexibility of remote with the added benefit of in-person collaboration when it matters

Requirements

- Extensive experience in client-side development on large scales

- You’re an expert in the latest JavaScript technologies (React, Angular, Vue, etc.)

- You’re proficient in tools like Webpack, Rollup, Parcel, and Babel

- Fluent in languages like Typescript and ES6+

- You’re an independent worker, eager to learn more while sharing knowledge and best practices

- Experience in Test Driven Development (TDD) and Continuous Delivery - an advantage

Wix Kyiv’s Frontend Engineering group develops the best products in the world. Wix enables more than 200M users around the world to build an online presence and manage their business online. Our group of engineers in Kyiv is developing products at the core of the company’s focus, including our main Editor and ground-breaking Wix Studio, as well as Payments by Wix. We’re facing world-class engineering challenges that impact millions of users, and that’s why we’re obsessed with code quality, testing, performance and code reviews.

About the Guild

We are Wix’s Frontend Engineering Guild. We build unique, scalable, resilient products and technologies that empower anyone to succeed online. Our mission is to develop complex micro-frontends and maintain the highest development standards. We embrace cutting-edge technologies, TDD, and clean code. We work in small teams, follow agile work methods and use continuous integration and delivery methodologies to run quickly. We love sharing knowledge and contributing back to the open-source community.