---
title: 'Freelance Senior .NET Developer / Tech Lead at WISE INTEGRATION'
canonical: 'https://feeny.ai/job/freelance-senior-net-developer-tech-lead-wise-integration-remote-y834rdgk3rqz'
type: 'job'
last_seen: '2026-10-17'
---

# Freelance Senior .NET Developer / Tech Lead at WISE INTEGRATION

- **Company:** WISE INTEGRATION
- **Location:** Remote
- **Compensation:** €30–€50/hr
- **Work type:** remote
- **Posted:** 2026-10-01
- **Last confirmed live:** 2026-10-17
- **Apply:** https://jobs.lever.co/wise-integration/829aa73e-904d-4acb-855e-7de426f7aea7

## Job description

Project/Client: Fintech

Location: Lithuania

**Start Date:**ASAP

Duration: 12 months

**Language:**English

Role Overview:

We’re looking for a Senior .NET Developer / Tech Lead to join our engineering team and build payment-focused backend solutions in a regulated fintech environment. This is a hands-on role combining software development with technical leadership. You’ll design and develop backend services, contribute to technical and architectural decisions, and help the team maintain high engineering standards.

Key Responsibilities:

- Design and develop backend services using C# / modern .NET
- Contribute to technical design and architectural decisions
- Build integrations with REST APIs, third-party platforms, messaging, and file-based interfaces
- Ensure code quality through code reviews and engineering best practices
- Mentor developers and lead technical discussions
- Work with SQL, relational databases, CI/CD, and Docker
- Build secure, reliable, and scalable software solutions
- Collaborate with product, compliance, QA, and other engineering teams

Must-Have Requirements:

- 7+ years of hands-on C# / .NET experience
- Strong backend development experience
- Experience with REST APIs, integrations, and distributed systems
- Strong SQL and relational database experience
- Experience with Docker and CI/CD
- Understanding of secure and reliable software development
- Experience as a Senior Engineer, Tech Lead, or similar
- Ability to take technical ownership and guide other developers

Nice to Have:

- Experience in payments, banking, fintech, or financial services
- Experience in a regulated / compliance-driven environment
- Knowledge of ISO 20022 / SEPA
- Understanding of clearing, settlement, or payment processing
- Experience with Azure or AWS

## 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

- [Product Owner (Fintech experienced)_cards aquiring CONTRACT (EU only)](https://feeny.ai/job/product-owner-fintech-experienced-cards-aquiring-contract-eu-only-wise-bvwzaxe9vtyp)
- [Android Software Engineer](https://feeny.ai/job/android-software-engineer-wise-integration-kaunas-qffsy7sygey4) — Kaunas, Lithuania
- [Platform Engineer (Candidates EU, EE, UK only)_Danske contract start 12 Oct](https://feeny.ai/job/platform-engineer-candidates-eu-ee-uk-only-danske-contract-start-12-oct-wise-ccmy0j650q2f)
- [Freelance Mid/Senior Analytics Engineer (EU citizenship (preferably Lithuania))](https://feeny.ai/job/freelance-mid-senior-analytics-engineer-eu-citizenship-preferably-lithuania-3qqtm951hrep)
- [Freelance Senior Data Engineer](https://feeny.ai/job/freelance-senior-data-engineer-wise-integration-remote-jze7nkv1sg6v)
- [Project Manager (IT infrastructure & application projects)_Lithuanian Citizens only](https://feeny.ai/job/project-manager-it-infrastructure-application-projects-lithuanian-citizens-only-7ttt0w05wts5)
- [MS Foundry Cloud / Networking Engineer | B2B Contract](https://feeny.ai/job/ms-foundry-cloud-networking-engineer-b2b-contract-wise-integration-remote-xxy9sryk97g0)
- [Azure AI / MS Foundry Consultant | B2B Contract](https://feeny.ai/job/azure-ai-ms-foundry-consultant-b2b-contract-wise-integration-remote-k08700ptxdqt)
- [Senior Java Developer | B2B Contract](https://feeny.ai/job/senior-java-developer-b2b-contract-wise-integration-mvaktg3t5bd3)
- [Senior DevOps Engineer](https://feeny.ai/job/senior-devops-engineer-wise-integration-vilnius-nkyphrjsvjg4) — Vilnius, Lithuania