--- title: 'Lead Senior Software Engineer – JavaScript, TypeScript, Node.js, React_based in Kaunas (Lithuanian citizens only) at WISE INTEGRATION' canonical: 'https://feeny.ai/job/lead-senior-software-engineer-javascript-typescript-node-js-react-based-in-te75cpxkcw0y' type: 'job' last_seen: '2026-10-24' --- # Lead Senior Software Engineer – JavaScript, TypeScript, Node.js, React_based in Kaunas (Lithuanian 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/4472bab7-30d2-45dd-9067-682677a5e62c ## Job description Hitcontract is looking for a Lead Senior Software Engineer for an international client – a global technology and business consulting organization delivering digital solutions and large-scale software projects for clients worldwide. The company operates in a multicultural, international environment and works with modern technologies to develop and maintain complex enterprise-level applications. We are looking for an experienced Lead Senior Software Engineer to join a team working across the full software development lifecycle. The role focuses on both front-end and back-end development, with JavaScript/TypeScript, Node.js, React, GraphQL, REST APIs, databases, and messaging systems at its core. The successful candidate will also play a key role in technical leadership, contributing to architecture and development practices while collaborating closely with engineers, product managers, stakeholders, and other teams. ## Key Responsibilities - Participate in and lead Agile ceremonies, including sprint planning, stand-ups, and retrospectives. - Collaborate with team members and stakeholders to gather and understand requirements for new features and enhancements. - Develop and maintain front-end web components using React, TypeScript, HTML, and CSS. - Design and develop software solutions using Node.js, GraphQL, and JavaScript frameworks and middleware. - Build and consume RESTful web services and APIs. - Apply software architecture and design principles, including DDD, CQRS, and Clean Architecture. - Write unit and integration tests to ensure code quality, reliability, and maintainability. - Participate in code reviews and provide constructive technical feedback. - Troubleshoot, debug, and resolve complex technical issues. - Contribute to the continuous improvement of software development processes, tools, and practices. - Communicate effectively with stakeholders and team members to ensure project objectives are achieved. - Stay up to date with emerging technologies and industry trends and identify opportunities to improve development practices. - Provide technical leadership and support to other team members. ## Requirements - 6+ years of professional experience with JavaScript, TypeScript, Node.js, React, HTML/CSS, and SQL. - Strong experience in both front-end and back-end development. - Proven team leadership experience, either in a technical leadership or managerial capacity. - Strong understanding and practical experience with: - Node.js - React - TypeScript / JavaScript - SQL - GraphQL - REST APIs - CI/CD pipelines - Message brokers - ORM - Strong knowledge of Domain-Driven Design (DDD), CQRS, and Clean Architecture. - Experience working in Agile development environments. - Excellent communication and collaboration skills. - Good command of English. ## Nice to Have - Knowledge of Vanilla JavaScript. - Understanding of V8. - Experience with WebAssembly. - Experience working with complex enterprise applications and large-scale software systems. - Experience mentoring and supporting other engineers. What Is Offered - The opportunity to join an international technology and business consulting organization working on complex, large-scale digital solutions. - An encouraging and collaborative working environment with a multicultural community. - Additional benefits, including private medical insurance with gym coverage, team events, outreach activities, and other employee benefits. - Hybrid working model with the opportunity to work remotely and from the office, with approximately 3 days per week in the office. - An open, modern, and ergonomic office environment. - Opportunities for professional and personal development, including access to learning platforms such as Udemy. - The opportunity to continuously develop your technical expertise and take on technical leadership responsibilities. Salary €6,000–€7,300 gross per 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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