Jobs Poland, JavaScript / Front-End

Rock&Apps is looking for a detail-oriented and motivated Junior Frontend Developer who cares about clean UI, performance, and real business impact 💻✨ 

This role is a great fit for someone who wants to strengthen their frontend fundamentals, work on real production tasks, and clearly see how their work affects users and revenue. 

You’ll collaborate closely with designers and the team to turn layouts into fast, responsive, and reliable interfaces. We value responsibility, clear communication, and the ability to move quickly without sacrificing quality.

What you’ll do

- Build and maintain marketing landing pages 

- Develop and improve the UI of our internal admin system 

- Work closely with designers to implement UI accurately 

- Optimize pages for performance, loading speed, and usability 

- Debug and improve existing layouts and frontend logic

What we’re looking for

- Strong knowledge of HTML and CSS, including responsive mobile-first layout, cross-browser compatibility, and working with Flexbox and CSS Grid 

- Solid understanding of JavaScript (ES6+), including vanilla JS, DOM manipulation, events, async/await, fetch, and basic API interaction 

- Experience with styling using SCSS and a CSS methodology such as BEM 

- Experience working with Git: branches, commits, and resolving merge conflicts 

- Basic understanding of modern build tools such as Webpack or Vite 

- Understanding of frontend performance and optimization techniques, including lazy loading, image optimization (WebP), and page load speed 

- Ability to work fast, decompose tasks, and confidently debug issues using browser DevTools (Elements, Console, Network) 

- Clear communication skills and the ability to explain technical details to designers and non-technical stakeholders 

- High level of responsibility

Extra points if you have

- Experience with React

What we offer

- A fast-growing environment with minimal bureaucracy 

- Support for professional development 

- 15 paid vacation days 

- 15 paid sick days 

- 5 paid days off 

- Benefit bar

We are looking for an experienced JavaScript developer with a strong understanding of React.

Role Overview:We are looking for an experienced JavaScript developer with a deep understanding of React. The main responsibilities will include the development of user interface components, refactoring and optimisation of existing code, and participation in mobile application development. Companies' projects are stable and long-term, with an active backlog of new front-office features.Key Responsibilities:

• Performing a technical assessment of business requirements to ensure the possibility of their implementation within a reasonable time;
• Fixing bugs in existing projects;
• Refactoring and optimising existing code;
• Optimising components for maximum performance across browsers;
• Creating new and modifying existing websites;
• Be proactive in communication with team members.

Ideal profile for the position:

• 5+ years of experience as a Front-End Engineer;
• Solid background in coding pure JavaScript;
• Strong proficiency in React 18+, including hooks, context, and modern patterns;
• Expert-level TypeScript experience with advanced types and strict configurations;
• Strong knowledge of state management tools (Redux, MobX, Zustand, etc.);
• Proven experience in building SPAs, PWAs, and working with RESTful and GraphQL APIs;
• Familiarity with front-end build tools (Webpack, Vite, Rollup) and CI/CD pipelines;
• Solid understanding of browser rendering behaviour and performance optimisation;
• Experience with automated testing frameworks (Jest, Cypress, etc.);
• At least 1-2 years of professional experience with React Native;
• Hands-on experience developing a React Native SDK for cross-platform projects;
• Level of English language – Upper-Intermediate or higher.

Will be a plus:

• Experience with micro frontends, monorepos, or component libraries (Storybook, Bit);
• Knowledge of design systems (Material UI, Tailwind, or similar);
• Exposure to WebAssembly, WebSockets, or real-time applications;
• Experience integrating third-party tools and libraries (e.g. Trustly, Whizdom);
• Ability to understand business requirements and translate them into technical requirements.

The company guarantees you the following benefits:

• Global Collaboration: Join an international team where everyone treats each other with respect and moves towards the same goal;
• Autonomy and Responsibility: Enjoy the freedom and responsibility to make decisions without the need for constant supervision.
• Competitive Compensation: Receive competitive salaries reflective of your expertise and knowledge as our partner seeks top performers.
• Remote Work Opportunities: Embrace the flexibility of fully remote work, with the option to visit company offices that align with your current location.
• Flexible Work Schedule: Focus on performance, not hours, with a flexible work schedule that promotes a results-oriented approach;
• Unlimited Paid Time Off: Prioritise work-life balance with unlimited paid vacation and sick leave days to prevent burnout;
• Career Development: Access continuous learning and career development opportunities to enhance your professional growth;
• Corporate Culture: Experience a vibrant corporate atmosphere with exciting parties and team-building events throughout the year;
• Referral Bonuses: Refer talented friends and receive a bonus after they successfully complete their probation period;
• Medical Insurance Support: Choose the right private medical insurance and receive compensation (full or partial) based on the cost;
• Flexible Benefits: Customise your compensation by selecting activities or expenses you'd like the company to cover, such as a gym subscription, language courses, Netflix subscription, spa days, and more;
• Education Foundation: Participate in a biannual raffle for a chance to learn something new unrelated to your job as part of your commitment to ongoing education.

Interview process:

1. HR Interview with the Recruiter;
2. A 1-hour Tech Interview;
3. A 1.5-hour Final interview with the team.

If you find this opportunity right for you, don't hesitate to apply or get in touch with us if you have any questions!

Sprinterra invites you to be part of a team that creates impactful digital products in the healthcare, real estate and other popular domains. We work on dynamic projects and provide a growth-oriented, collaborative environment where your expertise will make a difference.

Job Description:

We are looking for a proactive and independent Frontend / Mobile Developer (Angular + React + React Native) to join our team and take a central role in building and supporting digital solutions.

This role is ideal for someone who enjoys ownership, thrives in full-cycle development, and is comfortable working across web and mobile platforms. You will be involved in developing applications from scratch, maintaining and evolving existing codebases, and communicating directly with clients to ensure smooth delivery and an excellent user experience.

Key Responsibilities:

• Support and maintain existing mobile and web applications using Angular, React and React Native
• Build and maintain new mobile and web applications from scratch using Angular, React and React Native
• Plan and execute migrations of applications from older versions of Angular, React, and React Native to the latest stable versions, minimizing risks and downtime
• Refactor legacy code to improve maintainability, performance, and scalability during migration
• Design and implement intuitive UI/UX components across platforms
• Ensure performance, scalability, and cross-platform consistency
• Communicate directly with stakeholders and clients, gathering requirements and providing updates
• Collaborate with other developers, QA engineers, and product owners
• Follow best practices for security and compliance, especially in healthcare contexts

Requirements:

• 3+ years of professional experience in JavaScript/TypeScript development
• Proven experience with Angular, React and React Native in production environments
• Ability to develop applications from scratch and take ownership of technical decisions
• Hands-on experience migrating applications from legacy versions of Angular, React, and/or React Native
• Strong understanding of mobile app lifecycle, UI performance optimization, and REST API integration
• Experience with state management (Redux/MobX/Recoil or similar)
• Good knowledge of version control tools (Git) and CI/CD workflows
• Exposure to DevOps tools and cloud deployment (e.g., Firebase, AWS, Fastlane) – basic level
• Excellent communication skills and fluent English (Upper-Intermediate or higher) – must be able to interact directly with clients
• Familiarity with security and compliance standards in healthcare (HIPAA, GDPR) is a plus

Nice to Have:

• Familiarity with analytics, notifications, deep linking, and app store deployments
• Knowledge of testing frameworks such as Jest, Detox, Cypress, or similar
• Background working in Agile/Scrum environments
• UI/UX design skills or experience collaborating closely with designers

Sprinterra invites you to be part of a team that creates impactful digital products in the healthcare, real estate and other popular domains. We work on dynamic projects and provide a growth-oriented, collaborative environment where your expertise will make a difference.

Job Description:
We are looking for a proactive and independent Frontend / Mobile Developer (Angular + React + React Native) to join our team and take a central role in building and supporting digital solutions.

This role is ideal for someone who enjoys ownership, thrives in full-cycle development, and is comfortable working across web and mobile platforms. You will be involved in developing applications from scratch, maintaining and evolving existing codebases, and communicating directly with clients to ensure smooth delivery and an excellent user experience.

Key Responsibilities:

• Support and maintain existing mobile and web applications using Angular, React and React Native.
• Build and maintain new mobile and web applications from scratch using Angular, React and React Native.
• Plan and execute migrations of applications from older versions of Angular, React, and React Native to the latest stable versions, minimizing risks and downtime.
• Refactor legacy code to improve maintainability, performance, and scalability during migration.
• Design and implement intuitive UI/UX components across platforms.
• Ensure performance, scalability, and cross-platform consistency.
• Communicate directly with stakeholders and clients, gathering requirements and providing updates.
• Collaborate with other developers, QA engineers, and product owners.
• Follow best practices for security and compliance, especially in healthcare contexts.

Requirements:

• 3+ years of professional experience in JavaScript/TypeScript development.
• Proven experience with Angular, React and React Native in production environments.
• Ability to develop applications from scratch and take ownership of technical decisions.
• Hands-on experience migrating applications from legacy versions of Angular, React, and/or React Native
• Strong understanding of mobile app lifecycle, UI performance optimization, and REST API integration.
• Experience with state management (Redux/MobX/Recoil or similar).
• Good knowledge of version control tools (Git) and CI/CD workflows.
• Exposure to DevOps tools and cloud deployment (e.g., Firebase, AWS, Fastlane) – basic level.
• Excellent communication skills and fluent English (Upper-Intermediate or higher) – must be able to interact directly with clients.
• Familiarity with security and compliance standards in healthcare (HIPAA, GDPR) is a plus.

Nice to Have:

• Familiarity with analytics, notifications, deep linking, and app store deployments.
• Knowledge of testing frameworks such as Jest, Detox, Cypress, or similar
• Background working in Agile/Scrum environments.
• UI/UX design skills or experience collaborating closely with designers.

У NeverEnding ми створюємо ігри, які дійсно “затягують” - і зараз шукаємо Strong Middle JavaScript Developer, який допоможе нам оживити наші ідеї у вигляді слотів, instant та crash ігор.

Це роль для тих, хто хоче створювати нові ігри з нуля, працювати з сучасними технологіями та впливати на те, що бачать і відчувають гравці.

Що робити:

• Розробляти клієнтську частину ігор на JavaScript/TypeScript з використанням Pixi.js.
• Оптимізувати графіку, анімації та ефекти для швидкої й стабільної роботи на різних пристроях.
• Інтегрувати ігрову математику та логіку в готовий UI.
• Працювати разом із гейм-дизайнерами, математиками, художниками та продакт менеджерами для створення цілісного ігрового досвіду.
• Брати участь у проектуванні архітектури, визначати технічні ризики та пропонувати рішення.
   

Що очікуємо від тебе:

• 4+ роки досвіду в JavaScript/TypeScript розробці.
• Досвід роботи з Pixi.js (обов’язково).
• Практичний досвід у розробці слотів або інших азартних/геймінгових продуктів.
• Розуміння принципів побудови ігрової архітектури, оптимізації графіки та продуктивності.
• Досвід роботи з анімаціями, ефектами, інтеграціями API.
• Англійська мова - B1 (Intermediate)
• Аналітичне мислення, уважність до деталей, здатність оптимізувати складне.

Ми шукаємо людину, яка:

• Думає як гравець і кодить як інженер.
• Хоче створювати нові ігри, а не “перемальовувати скіни”.
• Любить швидкий темп, експерименти й технічні челенджі.
• Може брати відповідальність за свою частину продукту.

Чому варто приєднатися до NeverEnding?

• Робота з нуля над першими іграми компанії.
• Вплив на формування ігрової лінійки та технічного напряму.
• Пряма співпраця з фаундерами та продуктовою командою.
• Гнучкість, швидкість і відкрите поле для творчості.
• Стартап із амбіцією стати провайдером нового покоління.
   

📍 Формат: Remote / Hybrid — на твій вибір
🕐 Формат: Повна зайнятість | 40 год/тиждень | 5/2
💰 Зарплата: Конкурентна — обговорюється

NeverEnding тільки починається.

Tech stack: JavaScript, TypeScript, Pixi.js, WebGL (базово), Git