At Sytac, we build high-performing engineering teams for leading organizations in the Netherlands and beyond. We combine a pragmatic, people-first culture with strong technical craftsmanship — giving engineers autonomy in real production environments, backed by a consultancy that invests in growth, community, and long-term partnerships.

For one of our highly regulated, technology-driven clients in the financial services domain, we’re looking for a Senior Full Stack Developer to strengthen a core engineering team. You’ll work on complex, business-critical applications with a strong focus on backend development, integrations, and platform reliability.

This is a hands-on engineering role — not a lead or management position.

What you’ll do

• Design, build, and maintain backend services using Go (Golang)
• Develop and maintain frontend components using React & TypeScript
• Build integrations between internal platforms and applications
• Contribute to containerized application development using Docker
• Take ownership of services in production (build & run mindset)
• Write clean, testable code with a strong focus on stability and quality
• Collaborate closely within an agile, cross-functional team
• Actively contribute to code quality, documentation, and engineering standards

What we’re looking for

• Strong backend development experience, preferably with Go (Golang)
• Solid frontend experience with React and TypeScript
• Experience working with Python
• Hands-on experience with Docker and modern application development
• Understanding of IT security fundamentals
• Comfortable writing unit tests and building reliable software

Tooling & engineering practices

• Hands-on experience with most of: GitHub Actions, Jenkins, Docker, npm, skaffold, helm
• Able to work independently within an existing toolchain
• Comfortable owning applications end-to-end in production

Ways of working

• Strong analytical and problem-solving skills
• Truly hands-on developer (no lead/manager profile)
• Comfortable joining and contributing to an existing, complex codebase
• High sense of integrity and personal responsibility
• Curious mindset, continuously learning and adapting
• Team player: empathetic, collaborative, and open to diverse perspectives
• Feels at home in an agile environment and leads by example through code quality

Practical details

• Location: Amsterdam (office-based)
• Office presence: ~60% onsite
• Way of working: Agile team
• Focus: Backend-heavy full-stack development & integrations

What we offer

• High-impact role on business-critical platforms
• Hybrid working setup in Amsterdam
• Competitive salary or freelance rate
• Strong engineering culture focused on ownership, quality, and craftsmanship
• Long-term collaboration with room for growth and learning