--- title: 'Full Stack JavaScript Engineer (based in Kaunas)_ at WISE INTEGRATION' canonical: 'https://feeny.ai/job/full-stack-javascript-engineer-based-in-kaunas-wise-integration-kaunas-b00vhxnaysvb' type: 'job' last_seen: '2026-09-07' --- # Full Stack JavaScript Engineer (based in Kaunas)_ at WISE INTEGRATION - **Company:** WISE INTEGRATION - **Location:** Kaunas, Lithuania - **Work type:** hybrid - **Posted:** 2026-09-01 - **Last confirmed live:** 2026-09-07 - **Apply:** https://jobs.lever.co/wise-integration/11057043-2cbc-4b91-9d24-bfd5c48ea04f ## Job description We are looking for an experienced Full Stack JavaScript Engineer to join our team in Kaunas. In this role, you will design, develop, test, and maintain software applications across both the front-end and back-end. You will work primarily with JavaScript/TypeScript, Node.js, React, SQL, GraphQL, APIs and messaging systems. Strong experience with modern software architecture is essential. DDD, CQRS, and Clean Architecture are mandatory. ## What you’ll do - Develop and maintain front-end applications using React, TypeScript, HTML and CSS. - Design and develop back-end services using Node.js, GraphQL and other JavaScript frameworks and middleware. - Build and integrate RESTful APIs and web services. - Apply DDD, CQRS and Clean Architecture principles in software design and development. - Write unit and integration tests. - Participate in code reviews and contribute to technical decisions. - Troubleshoot and debug application issues. - Work with other engineers, product managers and stakeholders to define and deliver new features. - Take part in sprint planning, stand-ups, retrospectives and other agile activities. - Continuously improve code quality, development practices and engineering processes. - Keep up with relevant technologies and trends in the JavaScript ecosystem. ## What we’re looking for - 5+ years of professional software development experience. - Strong knowledge of JavaScript and TypeScript. - Solid experience with Node.js and React. - Good knowledge of HTML/CSS and SQL. - Strong understanding and practical experience with: - Domain-Driven Design (DDD) - CQRS - Clean Architecture - Experience designing and building production-grade software across the full stack. - Good understanding of APIs, software architecture and testing. - Ability to work independently and take ownership of technical solutions. ## Nice to have - CI/CD pipelines. - Message brokers. - ORM technologies. - GraphQL. - Deeper knowledge of vanilla JavaScript, V8, WebAssembly or related technologies. ## What we offer - Kaunas-based hybrid role with the possibility to work remotely 3 days per week. - Competitive salary of €4,485–€5,950 gross/month, depending on experience and technical expertise. - Additional health insurance, including gym subscription coverage. - Professional development opportunities, including access to Udemy. - Modern, well-equipped office. - Team events and other company benefits. - Opportunity to work on challenging software engineering projects and grow your technical expertise. ## About WISE INTEGRATION ## Company Overview - **One-liner**: Wise Integration is a fabless semiconductor company that develops gallium nitride (GaN) power ICs and digital control firmware to make power converters dramatically smaller, lighter, and more energy-efficient. - **Entity Type**: Private (Series B, raised $16.2M total) - **Headquarters**: Hyères, France (with offices in Grenoble, France; Ottawa, Canada; and Taipei, Taiwan) - **Founded**: 2020 (spinoff from CEA-Leti) - **Founders**: Ghislain Kaiser (CEO), Thierry Bouchet (CTO), Rym Benaboud Hamoumou (Chief Corporate Marketing & Strategic Communication) ## Core Business - **Primary industries**: Power electronics, semiconductors, GaN (gallium nitride) integrated circuits. - **Target customers**: B2B – manufacturers of consumer electronics chargers, data center power supplies, industrial equipment, light e-mobility, and automotive systems. - **Mission**: To push the boundaries of power conversion through GaN technology and advanced digital control, contributing to more efficient and sustainable power electronics. ## Products & Services - **WiseGan® Power ICs**: Gallium nitride integrated circuits that enable high-frequency, high-efficiency power conversion in a compact footprint. - **WiseWare® Digital Control Firmware**: Software-defined digital control that optimizes the performance of WiseGan ICs, enabling smaller size, better efficiency, and higher reliability. - **Co-packaged GaN Digital Controller** (in development): A next-generation solution combining GaN power stage and digital control in a single package, targeting AI data center infrastructure and other high-density applications. ## Market Standing - **Valuation / Market Cap**: Not publicly disclosed. - **Key Metric**: Total funding of **$16.2M** (Series B closed February 2024, led by imec.xpand). - **Notable Investors / Partners**: imec.xpand (lead investor), KEC, Powernet (partnership for AI data center power architecture). Additional investors from earlier rounds (Corporate Round, Non Equity Assistance, Venture Round). - **Growth Signals**: - Headcount of 32–40 employees, growing **+32.3% YoY**. - 6th anniversary celebrated in February 2026. - Strong IP portfolio and strategic partnerships with Korean companies KEC and Powernet for AI data center applications. - Recent news (June 2025) about co-packaged GaN digital controller plans. ## Competitive Advantages - **Integrated GaN + Digital Control**: WiseGan and WiseWare are designed to work together, offering a holistic solution that competitors often deliver as separate components. - **High-Frequency Architecture**: Enables dramatic miniaturization and efficiency improvements in power supplies. - **Proven Team**: Leadership with deep experience in deeptech (CEO co-founded Docea Power, acquired by Intel; CTO from CEA-Leti). - **Strong IP Foundation**: Spun out from CEA-Leti, a world-class semiconductor research institute, with a growing patent portfolio. ## Strategic Focus - **AI Data Center Infrastructure**: Partnering with KEC and Powernet to bring software-defined GaN power to high-density AI servers. - **Product Expansion**: Developing co-packaged GaN digital controllers to simplify customer designs and increase performance. - **Global Scale-up**: Expanding engineering and sales presence across Europe, North America, and Asia (Taiwan, South Korea, Hong Kong). ## Why Work Here - **Culture**: Emphasizes innovation, respect, diversity, and service. Described as “stimulating, supportive, collaborative, and inclusive” with a global team encouraged to contribute. - **Work Policy**: Hybrid workspace (employees combine remote and on-site work). Typical on-site presence expected. - **Team & Growth**: Fast-growing deeptech startup with a small, cross-functional team (30–40 people) across three continents. Opportunity to have high impact. - **Locations**: Offices in Hyères and Grenoble (France), Ottawa (Canada), and Taipei (Taiwan). International exposure. - **Tech Stack**: Work with C, Python, LabVIEW, MATLAB, Altium, Linux, and signal processing tools. ## Sources 1. [wise-integration.com](https://wise-integration.com/careers/) – Careers page 2. [wise-integration.com](https://wise-integration.com/about-us/) – About Us page 3. [linkedin.com](https://linkedin.com/company/wiseintegration) – LinkedIn company page (via web search summary) 4. [wise-integration.com](https://wise-integration.com/meet-our-team/) – Meet Our Team page 5. 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