Backend Engineer
0to9 AB / Datajobb / Stockholm
2025-09-29
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Team Is All
Ideas matter - but people make them real. In finance, that's harder than it should be. Innovation shapes how we live, but progress is slowed by complexity, regulations, and outdated systems. Too often, great people go elsewhere.
0TO9 exists to change that.
We're a fintech venture builder and investor - a bank for entrepreneurship, founded in Stockholm in 2025 by serial entrepreneur Oliver Hildebrandt.
Our mission: bring the right people, skills, and resources together so fintech founders can focus on building. From capital and compliance to tech and talent, we create an infrastructure for success.
Numbers are the building blocks of finance and with zero to nine, we can build anything. Our name says it all: From you to a team. From idea to impact. From now to what's next.
With offices in Stockholm and Berlin, operations across the Nordics, and a growing portfolio - we're just getting started.
About the role
At 0TO9, you won't just build services - you'll shape the core banking platform powering the next wave of fintech ventures. This is a chance to work with and solve complex problems at scale, and be part of building something from the ground up.
Build and maintain C#/.NET Core microservices on AWS ECS for the banking platform
Collaborate with product managers, architects, and engineers to deliver high-performance APIs
Write clean, testable code following SOLID principles
Apply DDD and CQRS to create modular, scalable, and maintainable systems
Design event-driven communication using NATS
Ensure reliability through idempotency, retries, and self-healing services
Implement observability: logging, metrics, tracing, and performance monitoring
Working with both relational (MS SQL Server) and NoSQL (DynamoDB) databases.
Contribute to secure design (auth, secrets, compliance)
Improve CI/CD, containerized workflows, and engineering practices
About you
We think you'll be a great fit if you:
Have backend experience working with microservices and distributed systems, C# and .NET Core and AWS
Take ownership, challenge unclear requirements, and prioritize reliability
Have applied DDD and CQRS in real-world systems
Understand event-driven architectures (ideally with NATS)
Care about writing clean, maintainable, testable code
Nice to have:
Previous fintech or banking industry experience
Hands-on experience with integration testing, contract testing, or end-to-end service testing
Knowledge of observability tools and testing strategies for microservices
Understanding of cloud security, governance, and compliance
What we offer: Be part of the leading fintech venture builder
A dynamic, entrepreneurial, international and fast-paced environment
Beautiful office in the heart of Stockholm
Strong opportunities for growth and development
Ersättning Lön enligt överenskommelse
Så ansöker du Sista dag att ansöka är 2026-03-18
Klicka på denna länk för att göra din ansökan Omfattning Detta är ett heltidsjobb.
Arbetsgivare 0to9 AB (org.nr 556976-4110),
https://www.0to9.com/ Arbetsplats 0TO9
Kontakt Amir Heiwandi
amir@0to9.com Jobbnummer 9531889