Jobs Fullstack

A potential invitation to potential minds!

4K-Soft is People. People are most important to us. People are at the heart of every connection we build. Come and join 4K-Soft, where human minds come together to pave the way for the future. We offer a variety of full-time jobs, training programs and internships. Only imagine, how you can help our company and start your career with 4K-Soft!

We are looking for a Middle FullStack Web Developer.

What we expect from you:
English level: B2 or higher
Experience: 3+ years working with Node.js and React

We offer:

Competitive level of remuneration

Convenient work schedule, paid vacation and sick leaves

The opportunity to grow professionally by participating in the implementation of interesting and complex projects, as well as showing personal initiative.

We are looking for a AI Developer (Full stack / AI Automation) to join our team

What You Will Do:

• Develop and implement AI-driven solutions and AI agents to automate business processes.
• Build backend services using Node.js to integrate AI models into products.
• Work with databases (SQL / NoSQL) for data storage and processing.
• Deploy and manage services using Docker.
• Develop systems using different LLM providers
• Build and optimize AI agent architectures and automation pipelines.
• Create agency multi-agent systems on different harnesses
• Work in Linux environments (Ubuntu) for development and deployment.
• Analyze user needs and design AI solutions to solve user problems.

What We Offer

• 21 days of paid leave per year
• 7 days of sick leave annually
• Health insurance
• English-speaking clubs
• Corporate events and team-building activities
• Long-term cooperation
• Annual performance review
• All necessary technical equipment provided
• Hybrid work format: 4 days in the office, 1 day fully remote

Hiring Process

1. Initial interview
2. Test task
3. Interview with a manager
4. Final interview with CTO.

Required Experience to Succeed in This Role:

• Strong experience with Node.js development.
• Experience working with databases (SQL or NoSQL).
• Ability to write clean, maintainable, and scalable code refactoring.guru
• Understanding of AI concepts, LLMs, or AI agents.
• Experience building and integrating REST APIs.
• Experience with Docker.
• Comfortable working in Linux (Ubuntu) environments.
• Ability to write clean, maintainable, and scalable code.
• English (spoken and written).
• Location - Kyiv

 Required skills 

• +4 years of active practice in C# .NET / .Net Core / ASP.NET Core  
• Knowledge at JS/HTML/CSS with commercial development experience minimum 2 years; 
• Experience in React, MaterialUI, Vite; 
• Experience of Mobx, Typescript; 
• Hands-on experience of building RESTful API’s and SPA’s; 
• Experience in MS SQL; 
• Experience in authentication and authorization; 
• Experience with code reviews and maintaining code quality standards. 
• Ability to take full responsibility for delivered code and its quality, including code generated or suggested by AI tools. 
• Intermediate+ English level.  

As a plus: 

• Knowledge of Rabbit MQ, Redis, Hangfire, SignaIR; 
• Experience in Docker; 
• Experience with micro front-end approach; 
• Experience of Unit test (XUnit, jest-junit); 
• Experience in ES6; 
• Experience in Bank, Retail, Financial or/and Point of Sales projects; 
• Experience in IdentityServer 4/ Duende 
• Experience in AppInsights, GrayLog, troubleshooting 
   

Responsibilities: 

• Integration with 3d party API’s and systems; 
• Support of existing and creation of new applications.  
• Active participation in discussions and decision making on internal products; 
• Proposing technical solutions based on business needs; 
• Participation in an estimation process for short, long term planning; 
• Active collaboration with team (participation in refinement sessions, daily meetings, planning sessions etc.) 

Project Description:

Wireless Standard POS (Point-Of-Sales) (www.b2bsoft.com) is our retail management solution for the Telecom Market.

It provides thousands of retailers with features and functionalities they need to run their businesses effectively with full visibility and control into every aspect of sales and operations. 

It is simple to learn, easy to use and as operation grows, more features can be added on.

Our system can optimize and simplify all processes related to retail in this business area. 


 

Few things that our product can do:

• Robust Online Reporting
• Repair Management Software
• 3rd Party Integrations
• Customer Connect Marketing
• Time and Attendance
• Carrier Commission Reconciliation

As a member of one of 5 product development teams in Kiev you will have the opportunity to work on a very complex product with microservice architecture (50+ for now) and communicate with Product, QA, Business analytics, Architecture and Customer Support teams to help improve product quality.

From a technology standpoint you will also have the opportunity to work with and develop the following technology stack which we use in our product development:

• For Back End development we use .Net Framework technologies, C# and .NET last LTS version etc.

• For Front End development we use React JS framework (Typescript).

On a daily basis we use additional technology stacks including: .NET, Microsoft Azure, MS SQL, HTML, CSS, JavaScript and many others.

We are looking for a Mid-level Full-Stack Developer (3+ years of experience) to work on a modern web project using an up-to-date technology stack.

🧩 Responsibilities:

• Develop and maintain the backend using NestJS (Node.js)
• Work with MySQL databases via TypeORM
• Develop the frontend using Angular 21
• Integrate third-party services and APIs
• Write clean, maintainable, and scalable code
• Participate in code reviews and team-based development

• Work with Git (version control)

  
  🛠 Requirements:

• 3+ years of commercial experience in Full-Stack development
• Strong knowledge of TypeScript
• Experience with NestJS / Node.js
• Experience with TypeORM
• Hands-on experience with MySQL
• Experience developing with Angular (version 21 or a close equivalent)

• Confident use of Git

   

  ⭐ Nice to have:

• Experience working with the OpenAI API
• Experience using Docker
• Writing and maintaining automated tests with Playwright

🎯 We offer:

• Work on an interesting and technology-driven project
• A friendly team and comfortable communication
• Fully remote work format
• Competitive salary (depending on experience)

We are looking for a Full-Stack Developer to join a long-term project for a marketplace platform in KSA.

The project is a full-time engagement for 12+ months, with the expected start date in approximately one month.

Responsibilities

• Develop and maintain scalable web applications for a marketplace platform.
• Build backend services and APIs using Java and Spring Boot.
• Develop responsive and user-friendly frontend interfaces using React / Next.js.
• Work with MySQL and other data storage technologies.
• Integrate and work with Redis and ActiveMQ.
• Implement new features and improve existing functionality.
• Write clean, maintainable, and well-tested code.
• Participate in code reviews and contribute to technical discussions.
• Collaborate closely with Tech Leads, Solution Architect, QA Engineers, and UI/UX Designers.
• Troubleshoot and resolve technical issues across both frontend and backend.
• Contribute to application performance, reliability, and scalability.

Requirements

• 3+ years of commercial experience as a Full-Stack Developer.
• Strong commercial experience with Java and Spring Boot.
• Solid experience with React and/or Next.js.
• Good knowledge of MySQL and relational databases.
• Experience working with REST APIs and backend integrations.
• Understanding of Redis and message brokers such as ActiveMQ.
• Good understanding of Git and modern software development practices.
• Experience working in Agile development teams.
• Ability to work across both frontend and backend layers.
• Good analytical and problem-solving skills.
• English — B1 or higher.

Would be a plus

• Experience developing marketplace, e-commerce, or other transactional platforms.
• Experience with Kubernetes and containerized applications.
• Understanding of Modular Monolith Architecture.
• Experience with distributed systems and asynchronous communication.
• Experience with CI/CD pipelines.
• Experience with cloud platforms.
• Familiarity with automated testing practices.

Project & Engagement

• Domain: Marketplace
• Client: KSA
• Employment: Full-time
• Duration: 12+ months
• Start: Approximately 1 month
• English: B1+
• Level: Middle+ Full-Stack Developer
• Open positions: 6

Playtech‘s IMS Engagement Unit is looking for a self-motivated Fullstack Developer with strong attention to detail and excellent collaboration skills.  

Please note that this is a temporary position (Military Service Cover).

Your influential mission. You will... 

• Work with a complex codebase that includes multiple Java versions and various architectural patterns. 
• Maintain and update legacy while preserving functionality. 
• Develop new features based on business requirements. 
• Write comprehensive tests for new and old functionality. 
• Debug and fix reported issues across the system. 
• Perform root cause analysis for critical bugs. 
• Monitor and optimize system performance. 
• Conduct code reviews and maintain code quality standards. 

Components for success. You... 

• Approximately 3 years of experience as a Fullstack Developer or several years of experience in Java development. 
• Have a strong background in Java development and front-end development using React with TypeScript. 
• Possess strong expertise in application performance optimization and database query optimization. 
• Are proficient in modern software design patterns and best practices to create scalable, maintainable, and high-performing applications. 
• Have experience with performance monitoring tools and profiling techniques. 
• Have experience in maintaining and modernizing legacy systems. 
• Are knowledgeable in Hibernate, JDBC, MariaDB, Kafka, Docker, Maven. 
• Understand GIT flow (pull requests, branches, etc.). 
• Are skilled with front-end tools and technologies: TypeScript, React, Redux, ES2020, HTML5, SCSS. 
• Have experience with MaterialUI, Webpack, Jest. 
• Excel in collaboration and teamwork, are self-motivated, and pay attention to detail. 

Thrive in a culture that values...  

• Technical excellence and engineering ownership.
• Initiative-taking and confident decision-making.
• Strong team environment and the ability work with the most recent market-leading technologies.
• Initiative-taking and confident approach at the workplace.
• Global scope and inclusive working environment where you can engage with diverse teams and perspectives.
• Constant learning and development opportunities and professional growth programs.
• Active lifestyle and mental well-being, supported through sports classes, master classes, and monthly well-being activities.
• Medical insurance.
• Paid vacation days, sick leaves and national holidays.
• Fully-equipped cosy office space located in the city centre (Gulliver, “Palats Sportu” metro station)

IMS ENGAGEMENT UNIT 

The award-winning IMS (Information Management System) is the industry’s most compelling player management system and the power behind Playtech's entire product portfolio, providing the tools needed to run and manage every aspect of our online gaming operations.  Our team focuses on the development of Player Journey - a powerful, real-time platform automation tool that empowers organizations to design their players’ experiences and streamline operational workflows through personalized journeys. Whether the goal is to encourage newly signed-up players to deposit, re-engage lapsed players, or intervene to reduce the risk of gambling-related harm, Player Journey is a fast and reliable tool. By joining our team, you will have the ability to make a significant impact by creating balance and uniting the front-end and back-end functions. You'll work with the latest technologies on a constantly growing and advancing product. This stable opportunity offers you the chance to contribute to one of the top applications within the engagement unit. 

Playtech is an equal opportunities employer. Our mission is to welcome everyone and create inclusive teams. We celebrate differences and encourage everyone to join us and be themselves at work.

SBC Performance drives scalable growth for brands ready to expand globally.

Working across eCommerce, health & wellness, education, and entertainment, our team helps brands acquire customers faster and scale across 26+ global markets. We combine data-driven paid media, performance creative, and advanced analytics to turn marketing into a predictable revenue engine.
Trusted by 200+ companies, managing $150M+ in ad spend.
 

Scale faster. Grow smarter.

Now, we’re looking for a Full Stack Engineer to join our AdTech product team. Someone passionate about building scalable, data-driven systems that power performance marketing automation and analytics.
 

Key Responsibilities:

• Design, build, and maintain frontend and backend services for the internal AdTech platform.
• Develop Angular (v12+) applications with TypeScript, using reactive patterns (RxJS, Angular Material, reactive forms).
• Implement and optimize state management and change detection for high-performance UI.
• Build and maintain Node.js microservices with TypeScript and RESTful APIs.
• Work with PostgreSQL (TypeORM) and Firestore (NoSQL) for data modeling and storage.
• Implement asynchronous patterns, error handling, and background data processing.
• Integrate with Google Cloud Platform (GCP): Cloud Functions, Firestore, Cloud Storage, and Secret Manager.
• Utilize Redis caching, message queues (RabbitMQ / Pub/Sub), and efficient pagination/filtering for large datasets.
• Collaborate with product, analytics, and QA teams to deliver robust, scalable AdTech solutions.
   

Requirements:

• 3+ years of experience as a Full Stack Engineer
• Experience with Node.js, Angular (v12+), and TypeScript in production environments
• Strong knowledge of RxJS, Angular Material, and reactive forms
• Experience with state management and change detection optimization
• Experience with microservices architecture and RESTful APIs
• Proficiency with PostgreSQL (TypeORM) and Firestore (NoSQL)
• Understanding of asynchronous patterns and error handling
• Experience deploying and managing Cloud Functions (triggers, logs, monitoring)
• Knowledge of Firestore queries, indexing, and data modeling
• Familiarity with Cloud Storage and Secret Manager
• Docker basics for local development and testing
• Experience with message queues (RabbitMQ or Pub/Sub)
• Redis caching and session management
• Handling large datasets (pagination, filtering, sorting)
   

Nice to Have

• Experience with ad platform APIs (TikTok Business API, Facebook Graph API, Google Ads API)
• Working knowledge of BigQuery for analytics and data aggregation
• Experience building worker pools and parallel processing pipelines
• Familiarity with CI/CD pipelines and deployment automation
• Understanding of AdTech concepts — campaigns, budgets, pixels, conversions
• Experience with high-volume, real-time data systems
   

What We Offer

• Hybrid job in Prague/Warsaw or remote
• Competitive compensation
• Flexible working hours: we start our operation day between 9:00 — 11:00 CET
• All necessary equipment
• Paid vacation and sick leaves
• Educational support: reimbursement of certification, training, and a knowledge-sharing atmosphere
• Company events and multiple internal activities
• Open feedback and transparent direct communication

Platipus is looking for an experienced Fullstack Developer with strong Node.js skills to join our team. Your role will involve building new internal services and supporting existing ones. If you’re looking to grow professionally, work on interesting projects, and be part of our team, we’d be happy to hear from you! 🚀

Requirements:

- 3+ years of Node.js experience, or strong hands-on experience with a solid project portfolio;

- Experience with TypeScript, React, and Next.js;

- Strong practical experience with AI-assisted development tools and workflows;

- Experience with Koa, Nest.js, or similar Node.js frameworks;

- Experience with RESTful APIs and third-party integrations;

- Experience with PostgreSQL and Redis;

- Experience with modern UI frameworks and component libraries such as shadcn/ui, MUI, or Ant Design;

- Ability to build polished, reusable, and user-friendly interfaces following modern UI/UX and frontend best practices;

- Experience with landing pages, public-facing websites, admin panels, dashboards, and CMS integrations;

- Experience with Docker, Git, and GitHub.

Responsibilities:

- Develop and maintain fullstack applications using Node.js, TypeScript, React, and Next.js;

- Use AI-assisted development tools and workflows to improve development speed and productivity;

- Maintain and improve existing applications and services;

- Build backend services, RESTful APIs, and third-party integrations;

- Develop admin panels, dashboards, internal tools, websites, and landing pages, as well as integrate and customize CMS solutions;

- Build clean, responsive, and user-friendly interfaces using reusable components and consistent frontend patterns;

- Improve application performance and maintainability;

- Participate in technical and architectural discussions.

It will be a plus:
- Experience with Redis, Docker, and additional modern frontend or backend technologies.

Work conditions:
- Medical insurance;
- Regular salary reviews and timely payments;
- Provision of necessary equipment for work as needed.

Professional development:
- Corporate English classes;
- Mentoring from experienced Team Leads;
- 50% reimbursement for courses/certifications/webinars, etc.;
- Development towards leadership positions within the company.

Work-life balance:
- Ability to work fully remotely;
- 20 days of vacation;
- Days off on public holidays;
- Paid sick leave;
- Informal online/offline events.

📌 Важливо: резюме без портфоліо ми не розглядаємо 📂

Про роль

Шукаємо Full-Stack розробника в інженерну команду для побудови сучасних високопродуктивних веб-застосунків.
Робота 50/50 на фронтенді та бекенді: проєктування масштабованих рішень, розробка нових фіч, оптимізація продуктивності системи.

Обов'язки

• Розробляти та підтримувати фронтенд-застосунки на Next.js 14, React 18 і TypeScript.
• Будувати адаптивні та перевикористовувані UI-компоненти на Tailwind CSS.
• Проєктувати та розробляти REST API на FastAPI і Starlette.
• Проєктувати, оптимізувати та підтримувати бази даних PostgreSQL і TimescaleDB.
• Реалізовувати кешування та оптимізацію продуктивності на Redis.
• Співпрацювати з продакт-менеджерами, дизайнерами та інженерами для поставки якісних фіч.
• Писати чистий, підтримуваний і покритий тестами код.
• Брати участь у код-рев'ю та технічних обговореннях.
• Діагностувати, дебажити та оптимізувати продуктивність застосунку.

Вимоги (must-have)

• Свіжий релевантний досвід в iGaming!
• Frontend: Next.js 14, React 18, TypeScript, Tailwind CSS
• Backend: FastAPI 0.111, Starlette
• Database & Infrastructure: PostgreSQL, TimescaleDB, Redis

Буде плюсом

• Docker і контейнеризовані деплої.
• CI/CD пайплайни.
• Хмарні платформи (AWS, GCP або Azure).
• Автентифікація (JWT, OAuth).
• Досвід побудови масштабованих високонавантажених застосунків.

Що пропонуємо

• Сучасний технологічний стек.
• Складні технічні проєкти.
• Гнучкий графік роботи.
• Професійне зростання та можливості для навчання.
• Колаборативна та підтримуюча інженерна культура.

Опис

Шукаємо Fullstack-розробника (Node.js / TypeScript + React) у два високонавантажені проєкти у сфері мобільного трафіку та атрибуції:

• Система атрибуції встановлень — serverless-пайплайн на AWS, який у реальному часі обробляє кліки та встановлення, визначає джерела й передає події у зовнішні системи (трекери, MMP, пікселі, пуші).
• Платформа керування доменами та трафіком — бекенд на базі Cloudflare Workers (Workers for Platforms) із динамічним роутингом і високою відмовостійкістю, а також власна вебпанель для керування доменами, воркерами та конфігураціями.
   

Вимоги

• 3+ роки комерційного досвіду розробки на Node.js / TypeScript.
• Досвід frontend-розробки на React + TypeScript.
• Впевнене розуміння асинхронності, досвід роботи із зовнішніми API, чергами та вебхуками.
• Досвід роботи з AWS (Lambda, Step Functions) або аналогічними serverless-рішеннями та готовність швидко опанувати необхідний стек.
• Практичний production-досвід із PostgreSQL та Redis.
• Розуміння принципів роботи розподілених систем: гонки, ретраї, ідемпотентність, консистентність.
• Git, CI/CD та code review як невіддільна частина процесу розробки.
   

Обов'язки

• Розробляти та підтримувати сервіси на Node.js / TypeScript і вебпанель на React.
• Проєктувати та розвивати serverless-логіку на AWS Lambda + Step Functions (Serverless Framework): атрибуція, обробка подій, черги (SQS), кешування (Redis), зберігання даних у PostgreSQL.
• Писати та деплоїти Cloudflare Workers (роутинг, KV, dispatch namespaces), працювати з Cloudflare API (zones, routes, workers).
• Розвивати адмінпанель для керування доменами та воркерами: UI, інтеграція з backend API.
• Інтегруватися із зовнішніми API: трекерами та MMP (Keitaro, Binom, Affise, Tenjin, AppsFlyer), піксельними API (Meta CAPI, TikTok Events) і push-платформами.
• Забезпечувати надійність систем: валідацію вхідних даних, обробку помилок, ідемпотентність, алертинг і self-healing.
• Брати участь у code review та delivery.
   

Буде плюсом

• Бекграунд в AdTech / трекінгу / атрибуції; розуміння мобільної атрибуції (postbacks, deep links, SKAdNetwork).
• Досвід інтеграції трекерів і MMP (Keitaro, Binom, Affise, Tenjin, AppsFlyer).
• Досвід роботи з high-load системами та обробкою великих обсягів подій у реальному часі.
• Досвід роботи із Serverless Framework, Infrastructure as Code та інструментами спостережуваності (Prometheus/Grafana).

Привіт! 👋

Ми - newage., digital-рекламна агенція, партнер Google Marketing Platform та TikTok, одна з найсильніших аналітичних команд у сфері digital-маркетингу в Україні.

Ми створюємо технологічні рішення, які допомагають автоматизувати маркетингові процеси, працювати з великими обсягами даних та будувати продукти, що реально впливають на ефективність рекламних кампаній. Зараз ми шукаємо Full Stack Developer, який допоможе розвивати внутрішні сервіси та будувати якісну, масштабовану архітектуру наших продуктів.

Що для нас важливо

• Комерційний досвід роботи Full Stack Developer від 3 років.
• Впевнене володіння Node.js та Python.
• Досвід роботи з сучасним фронтендом (React або аналогічні фреймворки).
• Практичний досвід роботи з Google Cloud Platform (GCP).
• Досвід роботи з Firebase.
• Розуміння принципів побудови масштабованої архітектури застосунків.
• Досвід проектування та розробки REST API.
• Вміння працювати з Git.
• Розуміння принципів UX та бажання брати участь у покращенні користувацького досвіду.
• Самостійність, відповідальність та системний підхід до розробки.

Чим будете займатись

• Розробляти та підтримувати backend-частину продуктів на Node.js та Python.
• Розробляти frontend-функціонал та вдосконалювати інтерфейси користувача.
• Проектувати та розвивати архітектуру нових і існуючих сервісів.
• Інтегрувати зовнішні API та внутрішні сервіси.
• Оптимізовувати продуктивність і масштабованість застосунків.
• Співпрацювати з командою щодо покращення UX-рішень та реалізації нових функцій.
• Брати участь у code review та технічному розвитку продукту.

Що пропонуємо

• Роботу з великими міжнародними брендами;
• Професійний розвиток в одній із найсильніших команд на ринку digital реклами;
• Досвід роботи зі світовими брендами;
• Гідна оплата праці;
• Гнучкий графік: пн-пт, з 9-11:00 — 18-20:00;
• Локація: віддалений або гібридний формат співпраці. Офіс у Києві з резервним живленням та доступом до стабільного інтернету - ст.м. Палац Спорту, вул. Шота Руставелі, 11;
• Роботу в команді, у якої є чому повчитися і яка завжди готова прийти на допомогу;
• Соц.пакет: оплачувані лікарняні, відпустки, компенсація навчання, корпоративна англійська, Mental Care-program;