SR. Full Stack Engineer (API)

Location: Oslo, Norway

Type of Contract: Full Time - Onsite

The Challenge:

At We Think Talent, we’re proud to partner with a fast-growing Norwegian fintech company building seamless, modern payment solutions for both online and physical retailers. With millions of API calls processed every day and high-profile clients across the Nordics, including Vy, Sport1, and Europris, our client is pushing the boundaries of what digital payments can be.

To support this ambitious growth, we’re looking for a Senior Backend Engineer to help drive the development of our client´s next-generation payments platform. This is your chance to take real ownership of the products you build, work in a highly technical environment, and shape the future of a company where engineers lead the way.

You'll work alongside a tight-knit team of experienced technologists in a startup-style culture with big goals, top-tier investors (including Schibsted Ventures and Bring Ventures), and a tech-first mindset.

What You’ll Do:

As a Senior Backend Engineer, you’ll play a leading role in building scalable, high-performance backend services that handle millions of requests per day. You’ll help design and implement robust APIs, integrate with third-party payment systems, and contribute to a flexible, microservices-based architecture built for speed and reliability.

You’ll be joining a team that believes in API-first design, fast deployment cycles, and taking ideas from concept to production quickly—without layers of bureaucracy.

Tech Stack:

• Node.js & TypeScript.

• AWS (Fargate, Lambda, DynamoDB, Aurora).

• Infrastructure as Code (AWS CloudFormation).

• Microservices Architecture.

Your Background:

• 4+ years of professional software engineering experience.

• Strong experience in building reliable, scalable APIs.

• Familiarity with third-party API integrations and modern web protocols.

• Experience with AWS and infrastructure automation is a strong plus.

• Comfortable working in a small, high-ownership team.

• Passionate about turning new ideas into robust production-ready features.

Benefits:

• Competitive compensation based on Tekna guidelines.

• Stock option opportunities in a rapidly growing fintech company.

• 5 weeks of paid vacation.

• Excellent private health insurance.

If you think your brain and heart are up for this challenge, click on the following link to apply: link