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Full Stack Engineer (Fintech)
Posted on March 28, 2026
- Helsinki, Finland
- 0 - 0 USD (yearly)
- Full Time
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We’re looking for a Senior Full Stack Engineer with strong React expertise, solid backend experience, hands-on Supabase, and deep experience with Stripe integrations and financial transaction systems. This role is focused on building and scaling a fintech application where real-time payments, secure data handling, and seamless transaction flows are core to the product.
Responsibilities
- Build and maintain a full stack web application using React
- Develop and integrate REST APIs, webhooks, and third party services such as Stripe
- Design and manage PostgreSQL databases
- Implement secure authentication and authorization systems
- Ensure high performance for live, transaction based applications
- Sync data seamlessly between web and mobile platforms
- Maintain strong security practices around financial and sensitive user data
- Collaborate in a startup environment with a small, fast moving team
8+ years of software development experience- Strong spoken and written English
- Advanced experience with React on the frontend
- Mid to senior level backend development experience
- Hands on experience with Supabase
- Experience with Stripe integrations on the backend
- Strong knowledge of REST APIs and webhooks
- Solid experience with PostgreSQL
- Experience building or maintaining real time or transaction driven applications
- Availability to work EST hours
- Fintech or payments industry experience will be a plus
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