--- title: 'Senior Software Engineer | JavaScript/TypeScript, Node.js, React | Kaunas | €4,485–€5,950 gross*EU citizens only at WISE INTEGRATION' canonical: 'https://feeny.ai/job/senior-software-engineer-javascript-typescript-node-js-react-kaunas-4-485-5-950-q3dfa03b78q4' type: 'job' last_seen: '2026-10-24' --- # Senior Software Engineer | JavaScript/TypeScript, Node.js, React | Kaunas | €4,485–€5,950 gross*EU citizens only at WISE INTEGRATION - **Company:** WISE INTEGRATION - **Location:** Kaunas, Lithuania - **Work type:** hybrid - **Posted:** 2026-09-22 - **Last confirmed live:** 2026-10-24 - **Apply:** https://jobs.lever.co/wise-integration/9afc2c2d-f332-45c4-8365-0c1b0c12aad1 ## Job description Hitcontract is looking for an experienced Senior Software Engineer for our client, a global technology and business consulting company delivering digital solutions and large-scale software projects for international organisations. The company works with modern technologies and complex enterprise systems, offering an international and multicultural environment where engineers have the opportunity to work on challenging projects and continuously develop their technical skills. We are looking for a strong Full Stack Engineer who enjoys working across both front-end and back-end development and has solid experience with JavaScript/TypeScript, Node.js, and React. ## What You Will Do - Develop and maintain web applications using React, TypeScript, JavaScript, HTML, and CSS. - Design and develop back-end solutions using Node.js and JavaScript/TypeScript. - Build and integrate RESTful APIs and GraphQL services. - Work with SQL databases and related technologies. - Participate in the full software development lifecycle, from requirements and design to development, testing, and deployment. - Write and maintain unit and integration tests. - Participate in code reviews and provide constructive feedback. - Troubleshoot and resolve technical issues. - Participate in Agile ceremonies, including sprint planning, stand-ups, and retrospectives. - Collaborate with developers, product managers, and other stakeholders. - Contribute to improving development processes, code quality, and engineering practices. - Stay up to date with modern technologies and industry trends. ## Requirements - 5+ years of professional software development experience with: - JavaScript / TypeScript - Node.js - React - HTML / CSS - SQL - Strong understanding of both front-end and back-end development. - Experience working with modern web applications and REST APIs. - Good understanding of software development principles and practices. - Experience working in an Agile environment. - Good communication and teamwork skills. - Good command of English. ## Nice to Have - Knowledge of CI/CD pipelines. - Experience with Message Brokers. - Experience with ORM technologies. - Experience with GraphQL. - Knowledge of Vanilla JavaScript. - Understanding of V8. - Experience or interest in WebAssembly. - Knowledge of software architecture and design patterns. What Is Offered - Opportunity to join a global technology and business consulting organisation and work on international projects. - An encouraging and collaborative working environment. - Additional benefits, including private medical insurance with gym coverage, team events, and other employee benefits. - Hybrid work model – 3 days per week working from the Kaunas office and 2 days remotely. - A modern, open, and ergonomic office environment with an international and multicultural community. - Professional and personal development opportunities, including access to learning platforms such as Udemy. - Opportunity to work with modern technologies and develop your expertise in complex enterprise-level projects. Position Details - Position: Senior Full Stack Engineer - Main technologies: JavaScript, TypeScript, Node.js, React - Location: Kaunas - Work model: Hybrid – 3 days/week from the office - Experience: 5+ years - Salary: €4,485–€5,950 gross/month, before taxes ## 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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