Jobs JavaScript / Front-End

Job Description

As a Software Engineer for Wix’s Editor platform, you'll work on building and designing infrastructure to enhance Wix's business solutions, creating scalable APIs, and improving application runtime and UX infrastructure used by millions of users. In your day-to-day, you will: 

• Build infrastructure to allow extendability of existing Wix business solutions 
• Design and build APIs for internal and external users 
• Work on application runtime and UX infrastructure used by millions of users 

• Communicate with colleagues inside and outside of the team: R&Ds, developers, UX designers, business analytics managers and more, to align requirements, dependencies, and move things forward 

   

Requirements

• 5+ years of experience in frontend development
• Proficient in TypeScript and comfortable with Vanilla JS, React Code, or server JavaScript 
• Skilled in solving complex challenges and delivering robust software design and architecture 
• Knowledge about WebWorkers and iframes 
• Ability to write clear, maintainable code 
• Direct communicator who loves owning a feature from end-to-end 

• Working beyond FED framework knowledge, with API design experience – an advantage

   

About the Team

Editor Platform makes products that the majority of FED developers inside Wix are using. We are developing a powerful and flexible infrastructure for App Development. 

Our main challenge is to find a solution that will empower application experience, and open new capabilities, and horizons for developers inside and outside of Wix. 

Part of our work is making great API, tools and providing platformized UX framework for App Experience. 

We are on the stage of opening our products for 3rd party developers and a huge development community. And that's why we need you so much.

We’re looking for a Senior Pixi.js Developer to build and optimize high-quality online casino games with complex mechanics, animations, and bonus systems.

You will work closely with Game Designers, Artists, Animators, and Backend Engineers to develop scalable game architecture, implement advanced gameplay features, and ensure smooth performance across platforms.

This role is ideal for someone who combines strong technical expertise with deep understanding of real-money gaming systems and production processes.

Responsibilities

• Develop online casino games using Pixi.js and TypeScript.
• Implement complex game mechanics, bonus features, and visual effects.
• Collaborate with cross-functional teams to deliver games from concept to release.
• Contribute to the development and improvement of the internal game framework.
• Optimize rendering and runtime performance for Canvas/WebGL environments.
• Maintain clean, scalable, and production-ready code architecture.
• Participate in technical discussions and feature decomposition.

Requirements

• 5+ years of commercial frontend/game development experience.
• 2+ years of experience in the Gambling/iGaming industry.
• Expert knowledge of Pixi.js and TypeScript.
• Strong understanding of casino math engine integrations and slot game architecture.
• Experience implementing bonus rounds, game states, and complex gameplay logic.
• Experience with GSAP, Spine, or similar animation libraries.
• Experience with Vite, Webpack, or similar build tools.
• Strong performance optimization skills for Canvas/WebGL applications.
• Understanding of Git-flow and collaborative development practices.

Would Be a Plus

• Experience leading projects from decomposition to release.
• Experience designing scalable architecture for game systems.
• Ability to independently coordinate delivery across departments.
• Experience mentoring developers or driving technical standards.

What We Offer

• Opportunity to build games played by thousands of users worldwide.
• Modern technology stack and product-focused environment.
• Strong team culture with open communication and collaboration.
• Professional growth and learning opportunities.
• Competitive compensation.

Location: United States (candidates must be physically based in the US)
Engagement: Short-term contract with a strong possibility of extension
Industry: Healthcare / HealthTech
Start Date: ASAP

Project Overview

We are looking for experienced Senior-level engineers to join a healthcare-focused project. This is an initial short-term engagement with the possibility of long-term extension if the collaboration proves successful.

The project is in the healthcare domain, so prior experience building applications for healthcare providers, insurance companies, EHR/EMR platforms, telemedicine, or other HIPAA-regulated environments is highly preferred.

We are open to considering Ukrainian candidates, provided they are currently located in the United States.

Senior Full-Stack Developer (Python/Node.js + React)

Tech Stack

Backend

• Python (preferred) with frameworks such as FastAPI, Django, or Flask
• OR Node.js with frameworks like NestJS or Express.js

Frontend

• React
• TypeScript
• Modern state management libraries (Redux, Zustand, React Query)

Cloud & Infrastructure

• Amazon Web Services (preferred), Google Cloud, or Microsoft Azure
• Docker, CI/CD pipelines
• PostgreSQL, MySQL, or MongoDB

Healthcare Integrations (Nice to Have)

• HL7/FHIR
• HIPAA compliance
• EHR/EMR integrations (e.g., Epic Systems, Cerner)
  
  Requirements
• 5+ years of professional software development experience.
• Strong experience with either:
  • Python + React, or
  • Node.js + React.
• Deep understanding of API design and distributed systems.
• Experience with SQL and NoSQL databases.
• Familiarity with cloud services and containerization.
• Experience in healthcare, HealthTech, or regulated industries.
• Strong English communication skills.
  
  2. Senior Front-End Developer (React or Angular)
• Tech Stack
• React or Angular
• TypeScript
• HTML5, CSS3, SCSS
• REST APIs
• State management (Redux, NgRx, Zustand)
• Testing tools such as Jest, React Testing Library, Cypress
  
  Requirements
• 5+ years of front-end development experience.
• Strong expertise in React or Angular.
• Advanced TypeScript and JavaScript skills.
• Experience with state management and component architecture.
• Understanding of responsive design and accessibility.
• Prior healthcare domain experience is strongly preferred.

We are seeking a talented Front End Engineer with over 5 years of professional experience to join our dynamic team. You will be responsible for building sleek, responsive, and user-friendly interfaces to enable real-time control and monitoring of robotic swarms and sensor systems. Your work will directly contribute to the usability and efficiency of our cutting-edge robotics solutions.

 

What is your Day to Day Mission:

• Design, develop, and optimize frontend applications for controlling and visualizing robotic swarms and sensor data.
• Collaborate with backend engineers to integrate APIs and ensure seamless data flow between frontend and backend systems.
• Build intuitive, performant, and responsive user interfaces using modern frontend frameworks such as React or comparable web component frameworks.
• Work closely with UX/UI designers to translate designs into functional applications.
• Ensure code quality, maintainability, and scalability through clean coding practices and code reviews.
• Troubleshoot and optimize frontend performance for real-time applications.

What you bring to the team:
 

• 5+ years of professional experience in frontend development.
• Proficiency in TypeScript and web component frameworks.
• Strong understanding of modern web development tools, concepts, and practices.
• Basic knowledge of backend systems and API integration.
• Experience with custom web-based rendering engines.
• Familiarity with RESTful APIs, WebSockets, and data visualization tools.
• Ability to write clean, efficient, and well-documented code.

• Excellent problem-solving skills and a passion for building user-friendly applications

  Nice-to-Have:

• Experience with robotics, sensor data visualization, or real-time control systems.
• Knowledge of state management libraries (e.g., Redux, MobX) and frontend build tools.
• Familiarity with backend technologies such as Node.js or similar.

• Understanding of testing frameworks and tools for front-end development.

   

Why Quantum-Systems:

• We stand with Ukraine.
• We believe in the power of combined efforts: straightforward tech expertise paired with a customer-centric focus.
• We are industry pioneers who are ambitious, bold, and visionary.
• We push limits, think outside-the-box and strive for technological excellence to shape the future of aerial data.
• We promise to be your runway for individual and professional growth.

Who we are:
Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.
 

About the Product:
The product is a fast-growing online entertainment platform focused on delivering browser-based games along with real-time interactive features. It serves an expanding audience and operates under conditions of high traffic, strict latency requirements, and secure micro-transaction processing within a social gaming environment.

The platform relies on a hybrid technology stack that combines a legacy codebase built with a widely used DOM-manipulation library and modern solutions based on React and Next.js. Current challenges include transforming legacy parts into a scalable, component-based architecture, implementing real-time interactions using WebSockets, maintaining consistency across mobile devices and browsers, and integrating payment and promotion management systems.

Strong engineering ownership is key to ensuring system stability, improving performance, and enabling fast, scalable feature delivery.

About the Role:
In this role, you will take ownership of frontend feature delivery from idea to production. You will work closely with frontend leadership, backend engineers, designers, QA, and DevOps to build and evolve a complex product.

A key part of your work will be driving the transition from a jQuery-based architecture to a modern React/Next.js setup. You will be expected to make architectural decisions, improve development workflows, and ensure high standards of performance, security, and code quality.

This position requires strong independence, solid technical judgment, and the ability to work in a fast-paced, evolving environment.
 

Key Responsibilities:

• Improve and maintain existing jQuery-based interfaces
• Build scalable and responsive UI using React and Next.js
• Refactor and structure CSS/SCSS for long-term maintainability
• Ensure cross-browser compatibility and strong mobile experience
• Implement and support real-time features using WebSockets
• Apply frontend security best practices
• Contribute to the design of a reusable component architecture
• Integrate APIs and collaborate closely with backend teams
• Set up and improve build tools and performance monitoring
• Implement and manage state using Redux, MobX, or similar
• Work with designers to deliver high-quality UI
• Develop key features such as payments, authentication, and promotions
   

Required Competence and Skills:

• 6+ years of experience in frontend development on production systems
• Strong experience working with legacy codebases (jQuery)
• Solid knowledge of React (Hooks, functional components)
• Hands-on experience with Next.js (SSR, SSG, API routes)
• Strong CSS/SCSS skills and responsive design expertise
• Proficiency in JavaScript (ES6+) and TypeScript
• Experience with WebSockets and async patterns
• Understanding of performance optimization and Core Web Vitals
• Familiarity with build tools like Webpack, Vite, or Gulp
• Experience integrating REST APIs
• Strong debugging and cross-browser troubleshooting skills
• Experience with state management libraries
• Git proficiency and experience working in teams
• Strong communication skills and ability to work independently
   

Nice to Have:

• Experience introducing TypeScript into existing projects
• Basic knowledge of PHP
• Experience with testing tools (Jest, RTL, Cypress)
• Experience with animation libraries like GSAP
• Familiarity with design tools (Figma, Zeplin, etc.)
• Understanding of CI/CD processes
• Knowledge of SEO and analytics
• Experience with hybrid mobile solutions (e.g., Cordova)
   

Why Us:

• We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in). 
• We provide full accounting and legal support in all countries we operate. 
• We offer a highly competitive package with yearly performance and compensation reviews.

As a Frontend Engineer at Wix Editor, you'll be part of our frontend community of over 1,000 talented developers. You'll take ownership of the technical side of projects, ensuring feasibility during the discovery phase, delivering features to production in a timely manner, and improving solutions during active development. Collaborating closely with product managers, designers, other developers, and QAs, you'll help create innovative and scalable solutions for our users.  

In your day-to-day, you will:  

• Be responsible for the technical side of projects  
• Participate in code review and pair programming  
• Implement features and help them become a reality  
• Share knowledge and collaborate with other teams  
• Discover the technical debt of features and help liquidate it  
• Participate in technical design, rollout, and post-production support for features  

Qualifications

• 5+ years of experience in frontend development  
• Strong proficiency in React, TypeScript, and frontend fundamentals like performance optimization, accessibility, and testing  
• Expertise in clean code practices and clean architecture principles  
• Passionate about programming  
• Based in Kyiv  

The team is part of the Harmony group, working on Wix Harmony — Wix’s AI-powered site creator. We have shipped big and complex products in less than a year. We are moving towards AI-driven development based on a strong understanding of how programming works. We focus on stable, efficient, and fast delivery while following high-quality standards, solid technical solutions, and complex architecture. We are a team of engineers where each member is proactive, efficient, and success-oriented. We support the growth of each team member and believe that the success of the company lies in its people. We also love sharing knowledge and contributing back to the open-source community.

We are a U.S.-based fintech startup operating in the investment and financial services space. Our distributed teams work across Poland, the United States, and Ireland, collaborating on technology-driven solutions related to stocks and investments.

Security, compliance, and the responsible handling of sensitive financial data are central to how we operate, as we build scalable products in a regulated environment.

Responsibilities

Design and develop full-stack applications using React.
- Build REST APIs following microservice standards.
- Implement user interfaces using Nexus design system.
- Refactor legacy components for modernization and performance. - Collaborate with architects to define scalable solutions.

- Participate in code reviews, testing, and sprint ceremonies.
- Optimize application reliability, performance, and maintainability. 

Skills
-  It will be beneficial if you have experience in Java, Spring Boot, REST API development. (4+ years of commercial experience)
- Expertise in React, JavaScript/TypeScript, UI state management.
- Experience with Nexus design system or similar component systems. - Understanding of cloud-native development and containerization.
- Knowledge of CI/CD, Git workflows, automated testing.
- Familiarity with security best practices for APIs.
- Good understanding of system integration patterns.

Senior Angular (v18+) and TypeScript Developer needed. Join the team for a UK-based healthcare company that enables remote patient monitoring, clinical research, and personalized healthcare.

What You’ll Do:

• Design and develop front-end features using Angular and TypeScript
• Contribute to front-end architecture decisions, ensuring scalability, performance, maintainability, and long-term code quality
• Work closely with UX/UI designers, product owners, backend engineers, and other stakeholders to shape product solutions
• Review code, provide technical guidance, and support other engineers in improving solution quality
• Identify technical risks, propose improvements, and help reduce technical debt
• Contribute to frontend standards, reusable components, and engineering documentation

What We’re Looking For:

• 5+ years of experience in frontend development, with strong hands-on expertise in Angular and TypeScript
• Deep knowledge of Angular v18+ and modern Angular patterns
• Strong experience with RxJS and reactive programming patterns
• Solid understanding of scalable frontend architecture, modularization, reusable components, and maintainable code structure
• Experience with Angular Material, SCSS/CSS3, responsive design, and cross-browser compatibility
• Strong knowledge of RESTful APIs, HTTP, authentication flows, and web application security principles
• Experience with unit and integration testing using tools such as Karma, Jasmine, Jest, or similar frameworks
• Strong Git experience and confidence working in collaborative development workflows
• Ability to mentor other developers, provide thoughtful code reviews, and raise engineering quality across the team

Nice to Have:
• Experience with performance optimization tools and techniques such as Lighthouse, lazy loading, bundle optimization, and runtime performance profiling
• Familiarity with CI/CD pipelines and deployment automation
• Exposure to backend development or full-stack experience
• Knowledge of accessibility standards (WCAG) and testing frameworks like karma

• Experience working with design systems or shared component libraries

Company Description

When you join Turnitin, you'll be welcomed into a company that is a recognized innovator in global education. For over 25 years, Turnitin has partnered with educators and institutions to develop learning integrity solutions that recognize the enduring value of critical thinking in a rapidly changing world. Over 16,000 academic institutions, publishers, and corporations use our services in more than 185 countries around the world: Turnitin Feedback Studio, Clarity, Originality, Gradescope, ExamSoft, Similarity, and iThenticate. Protecting the value of an authentic education is at the heart of who we are.

Experience a remote-first culture that empowers you to work with purpose and accountability in a way that best suits you, supported by a comprehensive package that prioritizes your overall well-being. Our diverse community of colleagues are all unified by a shared desire to make a difference in education.

Turnitin is a global organization with team members in over 35 countries including the United States, Mexico, United Kingdom, Australia, Japan, India, and the Philippines.

Job Description

Turnitin is seeking a Principal/Senior Frontend Engineer with strong expertise in modern frontend technologies such as web components, React, and microfrontends. This role is ideal for engineers passionate about designing and delivering intuitive, high-performing, and reliable user interfaces that support our award-winning educational platform.

As a core contributor to our product development team, you will play a critical role in shaping the user experience of both existing and new applications. You will collaborate closely with backend engineers, designers, and product managers to create scalable and engaging solutions that meet the needs of educators and students worldwide.

Responsibilities: 

• Component Development:
  • Design, develop, and maintain highly efficient, reusable, and scalable web components using Stencil.js, TypeScript, and React.
  • Build modular and reusable UI components to ensure consistency and maintainability across projects.
• Architecture & Best Practices:
  • Establish and enforce best practices for component design, including accessibility (WCAG compliance), performance optimization, and responsive design.
  • Collaborate with the team to define the architecture of the design system or reusable component library.
• Integration & Collaboration:
  • Ensure seamless integration of web components into various applications, particularly within React projects.
  • Work closely with backend engineers to design APIs that enable efficient data flow and interaction with frontend components.
• Code Quality & Standards:
  • Write clean, maintainable, and well-documented code, adhering to modern standards and practices.
  • Perform regular code reviews and ensure adherence to best practices and coding standards.
• Testing & Debugging:
  • Create robust unit and integration tests for web components.
  • Debug and resolve performance bottlenecks and other frontend issues.
• Collaboration & Mentorship:
  • Work closely with designers and product managers to understand requirements and provide technical insights during the planning phase.
  • Mentor junior frontend engineers, sharing knowledge on web components, Stencil.js, TypeScript, and React.
• Performance Optimization:
  • Continuously improve the performance of web components, ensuring compatibility with various browsers and platforms.
  • Optimize assets and rendering pipelines for faster load times and better user experience.
• Documentation & Support:
  • Create comprehensive documentation for the developed reusable components, including usage guidelines and examples.
  • Provide technical support to teams integrating the components into their projects.
• Continuous Learning:
  • Stay up-to-date with emerging frontend technologies, particularly in web components and frameworks like Stencil.js and React.
  • Proactively suggest improvements to existing tooling, frameworks, or processes to enhance team efficiency and product quality.
• Cross-functional Collaboration:
  • Collaborate with DevOps to streamline CI/CD processes for frontend builds and deployments.
  • Ensure smooth handoff of frontend deliverables to QA and collaborate on addressing issues during testing.

Qualifications

Essential Qualifications, Skills, and Knowledge/Experience

• 8+ years of professional experience in frontend development, with at least 2 years working on web components and React projects and building micro-frontends.
• Demonstrated experience in building and maintaining reusable component libraries or design systems used across multiple projects.
• Strong expertise in web components development using Stencil.js or similar frameworks. 
• Advanced knowledge of React and experience building reusable, high-performance components. Deep understanding of TypeScript, including advanced types, generics, and best practices for scalable codebases.
• Extensive experience with HTML5, CSS3, and modern JavaScript (ES6+). Familiarity with CSS-in-JS libraries and best practices for managing styles.
• Experience with unit testing, integration testing, and frameworks like Jest, React Testing Library, or similar tools.
• Strong debugging skills for browser-based issues and performance optimizations.
• Knowledge of frontend performance best practices, including rendering optimization, lazy loading, and asset management.
• Experience with modern build tools like Webpack, Rollup, or Vite.
• Proficiency with version control systems like Git.
• Familiarity with creating or maintaining design systems and component libraries.
• Understanding of accessibility standards (e.g., WCAG) and responsive design principles.
• Proven experience collaborating effectively with designers, product managers, and backend teams across geographically distributed time zones, including Europe and the USA, to deliver seamless and cohesive user experiences.
• Strong communication skills to articulate technical concepts and collaborate effectively.
• Hands-on experience writing comprehensive test cases to ensure code quality and reliability.

• Familiarity with integrating frontend builds into CI/CD pipelines, specifically using GitHub Actions.

   

Preferred Qualifications, Skills, and Knowledge/Experience:

• Understanding or experience with AI/ML.
• Understanding or experience with backend technologies.
• Knowledge of Progressive Web Apps (PWAs) and modern browser APIs.
• Familiarity with tools like Storybook for component documentation.

• Experience working with Agile/Scrum teams.

   

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.

Job Description

- 6+ years of relevant commercial experience as a frontend engineer.

- Deep expertise in the Chrome Extension API (permissions, declarativeNetRequest, messaging, storage). 

- Experience bypassing anti-scraping measures or handling highly obfuscated DOM structures. Familiarity with Shadow DOM and its impact on style isolation and scraping.

- Proven experience migrating or building under Manifest V3 architecture.

- Mastery of React for building extension-specific UIs (Sidepanels, Action Popups).

- Strong knowledge of Content Security Policy (CSP) and cross-origin resource sharing (CORS) in an extension context.

- Experience with TypeScript to ensure type safety across different extension environments.

- Expert-level understanding of DOM manipulation and scraping of asynchronous, "heavy" web apps. Knowledge of browser performance profiling to ensure the extension doesn't slow down the user's browser. Understanding of how to secure sensitive data within local extension storage.

- Proven experience contributing to mature Chrome extension projects maintained by multiple R&D teams, with complex shared codebases.

- Experience developing or maintaining automation and performance testing tools to monitor extension impact at scale, detect regressions, and ensure minimal disruption to end users.

Job Responsibilities

Our Chrome/Edge extension is a core part of the clinician's daily workflow. It lives alongside Electronic Health Record (EHR) systems, capturing data and providing real-time AI suggestions. We need a high-level specialist to lead the development of this extension, ensuring it remains robust against external site changes and maintains strict medical-grade security. Part of your responsibilities will include, but not limited to:

- Lead the architecture and development of our browser extensions using Manifest V3.

- Build sophisticated content scripts that reliably scrape and interact with dynamic EHR platforms.

- Manage complex background logic using Service Workers for session lifecycle management.

- Ensure the extension’s React-based UI (popups and overlays) is high-performance and non-intrusive.

- Implement secure, cross-context messaging between content scripts, service workers, and the main web app.

- Develop robust "DOM observers" to handle updates on third-party sites without breaking functionality.

- Collaborate effectively with multiple R&D teams on large, mature extension projects, contributing to a shared, scalable codebase.

- Design, implement, and maintain automation frameworks to continuously monitor extension performance, detect regressions, and measure the impact on browsers and external systems.

- Establish best practices for performance, security, and maintainability in large-scale, multi-team extension projects.

Department/Project Description

We are redefining the standard of care in mental health. Our platform empowers clinicians by automating administrative burdens—such as note-taking and compliance auditing—using cutting-edge AI and real-time audio analysis. By bridging the gap between clinical sessions and actionable data, we allow providers to focus on what matters most: the patient.

Requirements: 


-5+ years of experience in JavaScript game development
- Strong knowledge of HTML5, Canvas API, and DOM manipulation
-Proven track record in creating HTML5 games
-Advanced proficiency in JavaScript (ES6+), including async/await, modules, closures, and classes
-Experience with popular libraries/frameworks such as Phaser, Pixi and Three.js
-Solid understanding of object-oriented programming and expertise in performance optimization algorithms, memory management, and threading
-Experience integrating and optimizing Spine animations in game engines
-Experience with slots
-experience in leading and mentoring front-end development teams.
-strategic, structured and analytical thinking.
-strong collaboration and communication skills.


Responsibilities:

-Manage front-end developers team, and perform code reviews;
-Write clean, efficient, testable, and scalable code;
-Collaborate closely with the team to identify and prioritize areas for enhancement;
-Take part in the full development cycle and ensure smooth development and cooperation between the dev team and product owners
- Hands-on experience with AI tools as part of everyday work is a must


Nice to Have:

+ Experience optimizing HTML5 games for mobile browser performance
+ Understanding of CI/CD


Work conditions:

— 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.
 

Responsibilities and Duties:

● Designing and developing responsive user interfaces using React.
● Implementing and maintaining TDD in applications and continuous integration.
● Collaborating with a cross-functional team of project managers, project analysts, and sales staff to
deliver high-quality, interactive products on time.
● Driving best practices in testing, accessibility, and performance optimization.
● Collaborating cross-functionally with design, backend, QA, and product teams to deliver robust and
user-centric solutions.

Requirements:

● 6+ years of experience in JavaScript and TypeScript development.
● Should understand design patterns and their application to JavaScript development.
● Must know a modern front-end JS framework, such as React.js + Redux. Next.js is a bonus.
● Knows functional programming paradigms.
● Understands asynchronous programming paradigms and best practices.
● Git and branch management knowledge.
● Experience in debugging front-end problems and a knowledge of front-end debugging tools.
● Familiarity with custom package creation and integration.
● Should understand OO concepts and their application to JavaScript.
● Ability to work under pressure and deliver against tight deadlines.
● Hands-on experience with HTML5 and CSS3.
● Experience with Agile methodologies and development practices.
● Good communication skills and good organization skills.
● Proficiency in writing cross-browser compatible code.
● Bachelor’s degree in Computer Science or equivalent - preferred.

Шукаємо розробника для створення та розвитку HTML5 слот-ігор на Pixi.js: від сцен і анімацій до інтеграції з сервером та стабільної роботи на мобільних пристроях. Для нас важливі акуратна архітектура, висока продуктивність і переюзабельні рішення.

Задачі:

• Розробка клієнтської частини слот-ігор на Pixi.js / TypeScript: сцени, стани, UI, анімації, ефекти та переходи
• Реалізація ігрових механік: барабани (reels), paylines/ways, каскади, sticky, respin, hold&win, бонусні раунди (залежно від проєкту)
• Інтеграція з ігровим API: ставки, спіни, результати, бонуси, автоспін, історія, відновлення сесії
• Організація пайплайну ассетів: атласи (TexturePacker), шрифти, preloading, керування памʼяттю, версіонування ресурсів
• Оптимізація продуктивності (FPS, памʼять), профілювання, усунення витоків, стабільна робота в браузерах iOS/Android
• Підтримка спільного ядра / фреймворку: переюзабельні модулі, конфігурованість, документація, code review

Вимоги:

• Впевнене володіння JavaScript / TypeScript
• Досвід розробки ігор або високонавантажених інтерактивних web-застосунків
• Практичний досвід роботи з Pixi.js (контейнери, спрайти, текст, маски, фільтри, взаємодія, менеджмент текстур)
• Розуміння ігрового циклу (update/render), подієвої моделі, таймінгів та анімацій
• Досвід збірки та доставки проєктів: Vite / Webpack, Git, базове розуміння CI/CD (на рівні проєкту)
  
  Архітектура та ігрові патерни (обовʼязково):
• Впевнене застосування : Service Locator / DI, Command, State, State Machine, pub/sub
• Розуміння та практичний досвід з ECS: розділення даних і логіки, системи як обробники, керований update
• Практика MVVM та реактивності: звʼязування UI зі станом, однонаправлений потік даних, передбачувані сайд-ефекти
• Проєктування розширюваної архітектури: модульність, переюзабельні компоненти, контроль залежностей, тестованість
  
  Буде плюсом:
• Досвід роботи зі Spine / DragonBones
• Particles, shaders / filters, WebAudio
• Досвід роботи зі слот-математикою та форматами серверних відповідей провайдерів
• Підтримка кількох аспектів та орієнтацій екрана
• Локалізація, CDN-кешування ассетів
• Досвід створення внутрішнього SDK / рушія та супроводу набору ігор
  Нам важливо:
• Відповідальність за якість результату та дотримання дедлайнів.
• Ініціативність.
• Бажання професійного зростання та розвитку.
• Уміння самостійно розбиратися в задачах, знаходити рішення й відповіді на запитання, що виникають.
  
  Ми пропонуємо:
• Участь у створенні яскравих та інноваційних слот-ігор; 
• Роботу в міжнародній команді професіоналів; 
• Гнучкий графік та можливість працювати віддалено;
• Конкурентну винагороду, що залежить від досвіду та рівня експертизи;
• Простір для творчості, ініціативи та професійного зростання.

Job Description

5+ years of experience in front-end development.
At least 3 years of experience with React + TypeScript.
Experience building complex SPA applications using React.
Experience with RESTful APIs, component-driven development, and frontend architectural patterns (e.g., atomic design).
Experience building automation-friendly SPA applications.
Experience with cross-browser compatibility and WCAG accessibility implementation.
Experience with NextJs, Syncfusion UI and Tailwind CSS would be a plus.
Excellent problem-solving skills and ability to work in a fast-paced, agile environment.
Experience working with Azure DevOps for task tracking and code repository would be a plus.
Experience working with AI-based productivity tools would be a plus.
Experience with CI/CD pipelines, unit testing, and deployment automation tools would be a plus.

Job Responsibilities

• Perform as part of a team in designing, developing, and deploying high-quality applications using C#, React, and .NET Core working on one of the workstreams on the project in Healthcare domain.
• Take ownership of the front-end technical solutions for the project.
• Support development team in matters related to React and CSS.
• Conduct code reviews and support junior team members to ensure technical excellence and professional growth.

• Troubleshoot complex technical issues and optimize performance of applications.

   

Department/Project Description

Client is a leading global Contract Research Organization (CRO) that provides Phase I-IV clinical trial management, market access, and technology solutions with over 30 years of experience.