Backend Engineer
0TO9 | Bank of EntrepreneurshipSweden2 hours ago
ContractEngineering, Information Technology
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About 0TO9:
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 Innovation shapes how we live, but progress is slowed by complexity, regulations, and outdated systems.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.
We think you’ll be a great fit if you:
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 Innovation shapes how we live, but progress is slowed by complexity, regulations, and outdated systems.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
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
- 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
- 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
Key Skills
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