--- title: 'Senior Full Stack Software Engineer (Java/React) | Kaunas at WISE INTEGRATION' canonical: 'https://feeny.ai/job/senior-full-stack-software-engineer-java-react-kaunas-wise-integration-kaunas-fwkqyqsb6ewf' type: 'job' last_seen: '2026-09-07' --- # Senior Full Stack Software Engineer (Java/React) | Kaunas at WISE INTEGRATION - **Company:** WISE INTEGRATION - **Location:** Kaunas, Lithuania - **Work type:** hybrid - **Posted:** 2026-08-18 - **Last confirmed live:** 2026-09-07 - **Apply:** https://jobs.lever.co/wise-integration/6f701a01-122a-43f9-9331-37520c203bf5 ## Job description Sr. Full Stack Engineer is responsible for the design, development, and maintenance of software applications using Java, Kotlin, and React. This includes working with technologies such as Java, Kotlin, messaging brokers, ORM, as well as front-end web development technologies such as React, Next.js, TypeScript, HTML, and CSS. The Full Stack Engineer will be involved in all aspects of the software development life cycle, including requirement gathering, design, development, testing, and deployment. Strong technical skills and experience with both front-end and back-end development are essential for this role. Good knowledge of DDD design patterns, CQRS, and Clean architecture are mandatory. Strong React skills are expected. They will also be able to collaborate with other team members, including other engineers, product managers, and stakeholders, to deliver high-quality software on time. Key Responsibilities: - Participating in agile ceremonies such as sprint planning, stand-up meetings, and retrospectives. - Collaborating with other team members to gather and understand requirements for new features and enhancements. - Developing and maintaining front-end web components using React, Next.js, TypeScript, HTML, and CSS. - Designing and developing software using Java, Kotlin, and Hibernate. - Building and consuming RESTful web services and APIs. - Writing unit tests and integration tests to ensure code quality and maintainability. - Participating in code reviews and providing feedback to other team members. - Troubleshooting and debugging issues. - Continuously improving the software development process and practices. - Communicating with stakeholders and other team members to ensure project goals are met. - Keeping up-to-date with the latest technologies and industry trends to improve the software and the development process. Job Requirements: - Bachelor's or Master's degree. - 4-5 years of experience in software development. - Good knowledge of Java, Kotlin, React, and TypeScript. - Nice to have: Node.js, Next.js, GitHub Pipelines, Message Brokers, ORM, Azure, AWS, GCP. What we offer: - Opportunity to be part of a global organization. - Encouraging working atmosphere, engaging activities, and extra benefits (e.g., additional medical insurance (covers gym subscription), team events, outreach activities, and others). - Hybrid work model with remote work opportunities ( 3/5 days weekly from the office). - Open, modern, and ergonomic work environment when working from the office with the multicultural community. - Opportunity to grow professionally and personally (e.g., Udemy) and continuously develop within the domain. - The salary range for this position is from **4.485 to 5.950 EURO gross before taxes.**** The salary offer for the candidate is determined based on the predefined salary ranges for the position and depends on the level of competence and experience of the candidate. ## 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. [builtin.com](https://builtin.com/company/wise-integration) – Built In profile ## Other roles at WISE INTEGRATION - [Messaging Platform Engineer (Kafka) | Kaunas/Vilnius](https://feeny.ai/job/messaging-platform-engineer-kafka-kaunas-vilnius-wise-integration-vilnius-6dyv735sptgz) — Vilnius, Lithuania / Kaunas, Lithuania - [Senior Software Engineer (Java/React) | Vilnius](https://feeny.ai/job/senior-software-engineer-java-react-vilnius-wise-integration-vilnius-t84g2068zmkw) — Vilnius, Lithuania - [Sr. Software Engineer and Team Lead (Java, React) | Vilnius](https://feeny.ai/job/sr-software-engineer-and-team-lead-java-react-vilnius-wise-integration-vilnius-29frs87edj93) — Vilnius, Lithuania - [Senior Software Engineer and Team Lead (Java/.NET/Node.js) | Kaunas](https://feeny.ai/job/senior-software-engineer-and-team-lead-java-net-node-js-kaunas-wise-integration-15zsz9t6x7g2) — Kaunas, Lithuania - [Full Stack JavaScript Engineer (based in Kaunas)_](https://feeny.ai/job/full-stack-javascript-engineer-based-in-kaunas-wise-integration-kaunas-b00vhxnaysvb) — Kaunas, Lithuania - [Senior Full Stack JavaScript Engineer (based in Kaunas)](https://feeny.ai/job/senior-full-stack-javascript-engineer-based-in-kaunas-wise-integration-kaunas-k17xfee2kb9w) — Kaunas, Lithuania - [Senior iOS Software Engineer](https://feeny.ai/job/senior-ios-software-engineer-wise-integration-kaunas-10qnfmh9b2jx) — Kaunas, Lithuania - [Lead Sr. Software Engineer | Kaunas](https://feeny.ai/job/lead-sr-software-engineer-kaunas-wise-integration-kaunas-b1f86yzhaqxr) — Kaunas, Lithuania - [Sr. Software Engineer (NodeJS) | Kaunas](https://feeny.ai/job/sr-software-engineer-nodejs-kaunas-wise-integration-kaunas-53bqbtzn9ctp) — Kaunas, Lithuania - [Sr. Full Stack JavaScript Engineer | Vilnius](https://feeny.ai/job/sr-full-stack-javascript-engineer-vilnius-wise-integration-vilnius-4pc5sn27m5z0) — Vilnius, Lithuania