Senior Full Stack Developer (Java, Angular) - Join Our Innovative Team

Hello! We are Brainstack, a dynamic multi-product IT company based in Ukraine.If you are looking for a space where you can continuously scale your skills and enjoy tackling challenging tasks, then you’ve come to the right place. Here, you will find opportunities that will help you realize your ambitions, create profitable businesses without illusions, and transform ideas into successful IT products. Our team will always support you and never leave you alone with challenges.Our portfolio includes mobile and web applications and services with a million-strong audience, covering various niches: Health & Wellness, Mental Health, Astrology, AI, Utilities, Parental Control. We are also developing our own R&D center.We are seeking a Frontend Developer to join our experienced Mobile Studio team.About the Role:You will be responsible for creating fast, stable, and scalable web and mobile interfaces that implement the product's business logic and enhance user experience. Your work will help us quickly test and launch new solutions, including integrations with AI and analytical systems.What the Team Does:We maintain existing products and regularly create new applications from scratch, many of which are in the AI sector. Therefore, you will be involved in building architectures, interfaces, and overall user experiences for new products.Why You Might Be Interested:Work at the intersection of web, mobile, and AI technologiesOpportunity to expand your tech stack and work with new technologiesInfluence in creating new products, not just maintenanceStrong cross-functional collaborationAbout You:You have at least 2 years of commercial experience in frontend development.You are proficient in React, TypeScript, and SCSS, and have the ability to create fast, adaptive web interfaces, with experience in layout design and tools like Figma, Webflow.Code quality: You are familiar with testing tools (e.g., Jest), Git processes, and writing clean, maintainable code.You have experience working with REST API and WebSockets.Tools: You have experience with CI/CD, bug tracking systems (e.g., Sentry), and basic security practices.Your Responsibilities:Develop and maintain web and mobile applications using React.Create and integrate functionality and business logic into web applications: data visualization from the backend, working with analytics integrations and events.Collaborate with designers and product managers to ensure a smooth and user-friendly UX across all platforms.

Join our innovative technology team at Kyivstar as a Frontend Developer specializing in React! We are seeking a creative and enthusiastic developer to help design and build user-friendly applications that enhance the experience of our customers. This is a unique opportunity to work with a talented team in a dynamic environment where your ideas and contributions will directly impact our projects.

At Restream, we are searching for a skilled Senior Frontend Engineer to join our dynamic team in tackling complex challenges and creating top-tier products. In this pivotal role, you will be instrumental in developing new features, enhancing the user interface of our platform, and ensuring the reliability of our systems as we expand. You will work closely with a talented group of Engineers, driving processes and improving user-facing features. Your understanding of simplicity and reliability will guide your decisions, as each choice you make carries significant impact. We value small teams where every member plays a crucial role.Your ResponsibilitiesCreate visually appealing interfaces and interactions within Restream’s web services.Design and implement the UI and business logic required to support both new and existing features.Collaborate with product designers to develop exceptional and user-friendly UI/UX.Engage in code reviews, providing and receiving constructive feedback with the team.Stay abreast of emerging technologies and uncover potential opportunities within our environment.Desired QualificationsA proactive, entrepreneurial mindset that drives high-quality project delivery.Solid design sensibility, meticulous attention to detail, and a commitment to delivering an outstanding user experience.Proficient in JavaScript, TypeScript, and the latest ECMAScript specifications (experience with additional programming languages is advantageous).Deep expertise in React and its primary state management systems.Experience with CSS preprocessors such as LESS or SASS.Basic backend competencies: Node.JS, REST API development, and familiarity with relational or NoSQL databases.Comfortable with TypeScript, MobX, AWS, Linux, Docker, Kubernetes, and continuous deployment workflows.Strong verbal and written communication skills.Self-motivated, analytical, and effective within a team setting.Founded in 2015, Restream emerged from Ukraine with a passion for empowering creators to be seen and heard. As the leading multistreaming solution, we inspire over 10 million creators worldwide.

We are seeking a talented and passionate Embedded Developer to join our dynamic Fibra Team. In this role, you will work on cutting-edge embedded systems, contributing to the development and optimization of innovative solutions that enhance user experience and performance.You will collaborate with a team of skilled engineers to design, develop, and implement software for embedded systems. Your expertise will play a crucial role in driving our projects forward and ensuring high-quality standards are maintained.

Join the AI Creation Team, an integral component of Wix Harmony—Wix’s innovative AI-powered website builder. Our team is dedicated to developing the core functionalities that empower AI to craft real websites.Your Day-to-Day Responsibilities:Develop high-quality, scalable applications using React and TypeScript.Design and implement new features through the entire lifecycle, from concept to deployment.Review code contributions and uphold high engineering standards.Collaborate closely with product managers, designers, and engineers to launch AI-driven products.Tackle challenging tasks spanning both frontend and backend (Node.js).Engage in technical discussions, architectural decisions, and continuous improvements.

Join our dynamic team as a Frontend Engineer at Wix Editor, where you will collaborate with over 1,000 skilled developers in our frontend community. You will play a vital role in managing the technical aspects of various projects, ensuring they are feasible during the discovery phase, and delivering features efficiently to production. Your contributions will help enhance our solutions throughout the development process. By partnering with product managers, designers, fellow developers, and QA specialists, you will help design innovative and scalable solutions that elevate the user experience.In your daily tasks, you will:Oversee the technical execution of projectsEngage in code reviews and pair programming to enhance code qualityBring features to life through implementation and developmentCollaborate and share knowledge across different teamsIdentify and address technical debt related to featuresParticipate in the technical design, rollout, and support of features post-production

Join our innovative AI Creation Team at Wix Harmony, the forefront of Wix's AI-driven website development. We are dedicated to crafting the essential elements that empower AI to construct real, functional websites.Your Role:Develop high-quality and scalable code using React and TypeScript.Design and implement new features from conceptualization to production.Review code changes and uphold rigorous engineering standards.Collaborate effectively with product managers, designers, and other engineers to deliver AI-enhanced products.Tackle complex challenges in both frontend and backend (Node.js) development.Engage in technical discussions, make architectural decisions, and contribute to continuous improvement initiatives.

Role overview Vacancies seeks a Senior Frontend Developer in Kyiv to help grow our product team. This position focuses on expanding development capacity and improving the quality and scalability of our frontend architecture. The team values developers who bring strong Vue experience, care about clean code, and approach design thoughtfully. What you will do Work closely with the team to deliver new product features Refactor and improve existing frontend codebases Boost product performance and scalability Share ideas to enhance both code and workflow Own tasks and ensure they are completed Who thrives here Developers with deep Vue expertise People who show initiative and ownership Those who care about clean, maintainable architecture Individuals able to work independently and move projects forward without sacrificing quality The product Since 2020, the team has built a global platform connecting people across backgrounds, religions, and cultures. Over 1 million visitors use the site each month, with users from the USA, Australia, and other countries. The platform ranks among the top 5 in its category, recognized for high-quality video and a seamless experience even during peak traffic, maintaining 99.99% uptime. The product is ad-free, focusing on genuine connections supported by advanced UX/UI. Features include AI-powered content moderation, strong data protection, and tools for building authentic global relationships. The next milestone: reaching the top 3 among international web-based social networking services.

Role overview Miratech seeks a Senior Frontend Engineer in Kyiv with deep experience in React and design systems. The position centers on building scalable, user-focused web applications and strengthening design systems to ensure consistency throughout Miratech’s products. What you will do Collaborate with cross-functional teams to launch new features and refine existing ones Develop and maintain applications using React Enhance design systems to create a unified user experience across products Support projects at every stage, from initial concept to final implementation Location This is an on-site role based in Kyiv.

nix seeks a Senior Frontend Engineer to help build web applications that use AI and machine learning. The team develops platforms that streamline workflows such as content generation, validation, analysis, and transformation. Role overview This role centers on designing and maintaining frontend features for AI-powered platforms. The work involves creating interfaces that make it easier for users to interact with advanced AI tools. What you will do Develop and maintain frontend features for platforms that use AI and machine learning Design user interfaces that simplify interaction with complex AI tools Collaborate with engineers and product teams to deliver scalable, intuitive, and user-friendly web experiences Location This position is based in Ukraine.

ELEKS seeks a Middle Strong or Senior Full-Stack Developer skilled in .Net and React. This remote role is open to professionals based in Ukraine. Project Details Join a team building a large-scale Human Resources System funded by the US Government. The platform is designed to support several ministries in a Middle Eastern country, with the goal of streamlining human resource management across various departments. Key Focus Develop and maintain features using .Net and React Contribute to a project impacting government-level HR processes Collaborate with an international team on a long-term initiative Location This position is fully remote for candidates residing in Ukraine.

Join Restream as a Senior Frontend Software Engineer and take the lead in overcoming intricate challenges while crafting outstanding products. In this role, you will develop new functionalities, enhance the user interface of our platform, and boost the reliability of our systems as we expand. Collaboration is key; you will work alongside a team of dedicated engineers to refine processes and elevate user-facing features. You appreciate the significance of simplicity and dependability, evaluating the impact of every decision you make. We value small teams where each individual plays a pivotal role.Your ResponsibilitiesCreate visually appealing interfaces and interactions within Restream web services.Design and implement the UI and business logic necessary to support both new and existing features.Collaborate with a product designer to develop an exceptional and user-friendly UI/UX.Participate in code reviews, providing and receiving constructive feedback with team members.Stay updated on emerging technologies and uncover hidden opportunities within our ecosystem.What We SeekA dynamic, entrepreneurial spirit that drives high-quality projects to completion swiftly.A strong design sensibility, meticulous attention to detail, and a commitment to delivering an excellent user experience.Proficiency in JavaScript, TypeScript, and the latest ECMAScript specifications (experience with additional programming languages is advantageous).Expertise in React and its primary state management frameworks.Experience with CSS preprocessors such as LESS or SASS.Basic backend skills: Node.JS, building REST APIs, and working with relational or NoSQL databases.Familiarity with TypeScript, MobX, AWS, Linux, Docker, Kubernetes, and continuous deployment workflows.Excellent written and verbal communication capabilities.Self-motivated, analytical, and adept at thriving in a collaborative environment.Founded in 2015, Restream emerged from Ukraine with a passionate mission to empower creators to amplify their voices. As the leading multistreaming solution, Restream inspires over 10 million content creators globally, enabling them to reach wider audiences and enhance their online presence.

Join Wix as a Frontend Engineer for our dynamic Editor platform, where you'll play a vital role in enhancing our business solutions. You'll be responsible for designing and developing scalable APIs and improving the runtime and user experience infrastructure that serves millions of users globally. Your daily responsibilities will include:Creating robust infrastructure to extend existing Wix business solutionsDesigning and implementing APIs tailored for internal and external stakeholdersOptimizing application runtime and UX infrastructure utilized by millionsCollaborating with diverse teams including R&D, developers, UX designers, and business analysts to align requirements and drive progress

Our Mission and VisionAt Solidgate, we are dedicated to empowering visionary entrepreneurs in building exceptional internet companies. Our goal is to provide the financial infrastructure necessary for these innovators to thrive in the digital economy. We aim to establish ourselves as the leading payments orchestration platform globally.About the Team and RoleWe are seeking a talented Frontend Engineer to join our dynamic Finance Engineering team. This team is responsible for developing a robust finance system, essentially a powerful calculator that ensures the accurate and timely processing of payments for our merchants. With over 18 million payments processed monthly, your work will directly influence automated payouts and financial reporting.Why This Could Be Your Next Big MoveMeaningful Impact: Contribute to a mission-critical platform that shapes the financial landscape of our services.Collaboration with Industry Experts: Work alongside engineers with experience from Amazon, Revolut, Wix, and other leading companies.Autonomy and Ownership: Take full ownership of your projects from inception to deployment, allowing you to witness the direct impact of your contributions.AI-Enhanced Development: We prioritize developer productivity by providing tools like GitHub Copilot, Windsurf/Cursor, and Coderabbit to streamline your coding process and reduce repetitive tasks.Why Now is the Ideal Time to Join UsWe are building a next-generation financial system from the ground up, focusing on modular and transparent fee calculations while laying the groundwork for future financial modules.Explore our technology stack here.Your ResponsibilitiesEnhance the platform: Develop frontend solutions for new financial configurations, supporting various contract types and commission models.

Join our dynamic team at wix2 as a Frontend Engineer. In this pivotal role, you will leverage your skills in modern web technologies to create visually appealing and highly functional user interfaces. You will collaborate closely with designers and backend engineers to deliver seamless web experiences that delight our users.

N-iX is looking for a Senior React Engineer to join its Ukraine-based team. The team builds a platform that connects savers to high-yield savings accounts and investment products from over 400 partner banks worldwide. This marketplace aims to make saving more transparent and convenient, offering competitive rates for users and cost-effective deposit funding for banks. Technology Stack Backend: Java (Spring Boot), MySQL, Kafka, AWS Web: TypeScript, ReactJS Mobile: TypeScript, React Native What you will do Develop and maintain customer-facing platforms and internal tools, with a focus on strong user experiences. Lead application and service development from initial design through deployment and ongoing improvement. Own feature delivery throughout its lifecycle, from discovery and implementation to testing, iteration, and launch. Write secure, maintainable, and well-tested code, including unit, integration, component, and contract tests as needed. Collaborate with Product, UX, Risk, and other teams to turn complex requirements into practical, secure solutions. Contribute to architectural discussions and help define technical standards and best practices. Work to improve engineering processes, CI/CD pipelines, automation, and operational readiness. Participate fully in an agile, cross-functional team, taking responsibility for end-to-end delivery. Use AI tools thoughtfully to accelerate delivery and improve code quality. Foster a collaborative team culture by sharing knowledge, offering feedback, mentoring, and pairing. Support open communication and continuous improvement, focusing on both personal and team growth.

Embark on a thrilling journey with Innovecs Play as we explore the dynamic landscape of the Game Development industry! We are on the lookout for a talented Frontend Engineer who possesses the enthusiasm and expertise to transform innovative game concepts into robust and high-quality code. At Innovecs Play, we cultivate our skills through collaborative quests, working closely with industry leaders. We cherish teamwork, knowledge sharing, and an inquisitive spirit, all of which inspire us to excel and develop. As a member of our team, you will engage in multifaceted aspects of game development, from ideation to launch and beyond. You will skillfully navigate both 2D and 3D environments, enhancing user experiences while experimenting with diverse solutions to bring imaginative game designs to life. We provide a platform for you to break new ground, gain fresh insights, and bolster your existing skill set!

Join the Artificial Intelligence Office at ELEKS, where we are revolutionizing the energy sector. We are looking for a talented Data Scientist to support our projects in Poland, Croatia, or Ukraine. As a key member of our team, you will work closely with a British client that specializes in producing electricity with zero carbon emissions.

Empower the Digital Economy with SolidgateAt Solidgate, we are dedicated to empowering exceptional entrepreneurs to create outstanding internet companies. Our mission is to provide the financial infrastructure needed to fuel the builders and innovators shaping the digital economy. We are on a relentless journey to become the leading payments orchestration platform worldwide.Why Join Us?Work on a backend-driven product featuring intricate logic and a modern tech stack.Our AQA Tech Stack: Java, TestNG, Selenide, Retrofit, Testomatio.Emphasize quality from the very first line of code — it’s not an afterthought.Automation-first Culture: We believe in quality ownership by every engineer, searching for true engineers, not just testers.Testing at Scale: Our platform operates over 200 individual auto-test suites per service, generating more than 150,000 test results daily.AI-driven Code Review: Reduce boilerplate code, enhance deployment speed, and concentrate on solving real challenges rather than battling repetitive code.The Role and Team DynamicsWe are seeking a Middle / Senior Automation QA Engineer to enhance our Integrations Team, ensuring the reliability of Solidgate’s payment integrations with global payment providers.Your primary responsibility will be testing integrations with payment providers, including card payments and alternative payment methods (APMs). You will validate payment flows, assess provider responses, evaluate business logic, and ensure robust error handling for reliable integrations across various scenarios.Your ContributionsEstablish Test Coverage: Analyze functional requirements, risks, and technical specs to prioritize and focus on critical product aspects effectively.Create Meaningful Test Artifacts: Develop comprehensive automation plans and logical test scenarios to ensure coverage of essential functional areas and pinpoint critical defects.Build Reliable Automated Tests: Design and implement stable automated tests that deliver timely feedback within the CI/CD pipeline.