--- title: 'Freelance Senior (.NET) Software Engineer (B2B Contract) at WISE INTEGRATION' canonical: 'https://feeny.ai/job/freelance-senior-net-software-engineer-b2b-contract-wise-integration-vilnius-a8ed00pgcp7q' type: 'job' last_seen: '2026-09-19' --- # Freelance Senior (.NET) Software Engineer (B2B Contract) at WISE INTEGRATION - **Company:** WISE INTEGRATION - **Location:** Vilnius, Lithuania - **Compensation:** €50–€60/hr - **Work type:** remote - **Posted:** 2026-09-16 - **Last confirmed live:** 2026-09-19 - **Apply:** https://jobs.lever.co/wise-integration/4464652f-de05-4c77-a3af-a5740e212eb6 ## Job description Location: Vilnius, Lithuania — preferably hybrid, or remote within the EU / UK Contract period: 1 October 2026 – 31 December 2026 ## About the Role We are looking for an experienced .NET Software Engineer to join a mature, highly skilled squad working on a modern, distributed banking platform. You will contribute to the design and development of a scalable, reliable, and secure solution built around native AWS services and high-criticality data pipelines. ## Key Responsibilities - Design and develop robust enterprise applications using .NET 10. - Build modern, distributed solutions leveraging native AWS services. - Develop highly scalable and reliable solutions for high-criticality data pipelines. - Contribute to maintaining high standards of software quality, performance, and security. - Investigate and resolve incidents, bugs, and production issues. - Work effectively within a self-organizing Scrum team and contribute to an agile way of working. - Create and maintain comprehensive technical documentation where required. - Collaborate closely with software architects, engineers, business analysts, and other stakeholders. - Contribute to the development of a modern, robust, and secure banking platform. - Stay current with emerging technologies and contribute to continuous technical improvement. ## Requirements - 3–5+ years of professional experience developing and delivering robust enterprise products or applications. - Strong experience with .NET 10 / C#. - Thorough understanding of cloud technologies, particularly AWS, including services such as: - AWS Lambda - Amazon S3 - Amazon SQS - AWS Step Functions - Amazon DynamoDB - and other native AWS services. - Experience with GitHub Enterprise. - Hands-on experience with CI/CD automation. - Experience with Infrastructure as Code (IaC), particularly Terraform. - Experience working in Agile / Scrum environments. - Bachelor's degree or higher in Engineering, Computer Science, or a related field. - Upper-Intermediate English (B2+), both written and spoken. ## Nice to Have - Experience with enterprise-grade data platforms, particularly Databricks. - Experience with message streaming / queueing platforms such as Apache Kafka. - Experience working with distributed systems and high-volume data processing. - Previous experience in banking or other highly regulated environments. ## What You Can Expect - Work alongside a mature team of highly skilled technology professionals. - Opportunity to work with modern .NET and AWS technologies. - Exposure to distributed systems and high-criticality data platforms. - A self-organizing Scrum environment with a strong engineering culture. - Collaboration with experienced architects, engineers, and business analysts. - Opportunity to contribute to a modern banking platform where reliability, security, and scalability are critical. ## 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 - [Digital Experience Lead/UX Transformation Lead (Lithuanian citizens only)](https://feeny.ai/job/digital-experience-lead-ux-transformation-lead-lithuanian-citizens-only-wise-97n58yhzvzc3) - [Freelance Senior FLEXCUBE System Analyst (B2B Contract)](https://feeny.ai/job/freelance-senior-flexcube-system-analyst-b2b-contract-wise-integration-remote-k1wqc6pg8dtc) - [Freelance Chief Business Analyst (B2B Contract)](https://feeny.ai/job/freelance-chief-business-analyst-b2b-contract-wise-integration-remote-xgfxg3y1zydn) - [SharePoint/.NET Application Support Developer](https://feeny.ai/job/sharepoint-net-application-support-developer-wise-integration-vilnius-z63rmhhfc625) — Vilnius, Lithuania / Kaunas, Lithuania - [Senior SharePoint/.NET Application Support Developer](https://feeny.ai/job/senior-sharepoint-net-application-support-developer-wise-integration-vilnius-4qqb3v1r6z15) — Vilnius, Lithuania / Kaunas, Lithuania - [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