Senior Software Engineer - Payments
Epidemic Sound AB · Stockholm · Tills vidare · Deadline 2026-12-16
Epidemic Sound is seeking a **Senior Software Engineer - Payments** to join its payments team in Stockholm. The team fully owns checkout, subscriptions, invoicing, refunds, tax, and payment provider integrations from domain modelling to infrastructure, which includes **participating in on-call rotations**. Primary initiatives involve setting the technical direction for and building a greenfield purchase platform in Go alongside the current architecture, migrating live paying customers seamlessly, maintaining compliance-heavy integrations such as 3DS and SCA, and occasionally contributing to the customer-facing purchase flow in TypeScript. The work is carried out in short iterations in close collaboration with product, finance, and frontend web teams. Candidates must have several years of experience building and running backend services in production, with an emphasis on correctness over shipping speed. Essential requirements include **strong proficiency in Go or Python** with a willingness to work in both, solid skills in SQL and relational data modelling with Postgres, and hands-on cloud experience managing infrastructure via Kubernetes, Helm, and Terraform, preferably on Google Cloud. Applicants should also possess either working knowledge of or a genuine interest in TypeScript and React, alongside relevant payments experience or interest. Previous work migrating live billing platforms, managing event-driven systems, handling PCI scope, and using AI coding agents is advantageous.
We're looking for a Senior Software Engineer to join our Payments team in Stockholm. We're a small team that owns everything that happens when someone pays Epidemic Sound: checkout, subscriptions, invoicing, refunds, tax, and payment provider integrations happens through systems we build and run. We work in short iterations where our changes bring immediate customer value.
Our main initiative is a new purchase platform in Go: a greenfield subscription domain, built alongside today's system, including a seamless migration of live paying customers onto our new system. You'll help set and implement this technical direction.
We’re a small and collaborative team that owns services end to end, from domain model to Terraform, on-call included. You'll work closely with Product, Finance, and the web teams whose checkout journeys sit on our APIs. AI is part of our daily toolchain, which puts more weight on judgement: we read as much code as we write.
Your key responsibilities include
- Own payment and subscription services end to end: design, build, deploy and monitor them.
- Build the next generation of our purchase platform in Go, and move live subscriptions onto it safely.
- Build and maintain our payment provider integrations, including the compliance-heavy parts like 3DS and SCA.
- Work in the customer-facing purchase flow in our web codebase (TypeScript) when needed.
Requirements
- Several years building and running backend services in production, ideally in a space where correctness mattered more than shipping speed.
- Strong in Go or Python, and happy to get productive in the other. Our services are built in both.
- Good in SQL and relational data modelling. We use Postgres.
- Cloud experience, preferably Google Cloud, and comfortable owning your own infrastructure (Kubernetes, Helm, Terraform).
- Enough TypeScript and React to make changes in a shared frontend codebase, or a real interest in picking it up.
- Experience with payments, or a clear interest in it: subscriptions, billing, provider integrations, reconciliation, etc.
It would also be music to our ears if you have
- Migrated a billing or payment platform with live customers on it.
- Worked with PSPs, card networks, 3DS and SCA, or inside PCI scope.
- Experience building event-driven services using Pub/Sub or a comparable messaging system.
- Practical experience applying AI coding agents in production, and sound judgement about when to rely on them.