What You’ll Do

Define and evolve the backend technology stack based on system constraints, trade-offs, and long-term maintainability
Drive architectural decisions across backend services, infrastructure, and the data layer
Design and build systems where correctness, security, and performance are non-negotiable
Architect APIs and services for high concurrency and large volumes of real-money transactions
Design data models and transaction flows with strong guarantees around consistency and integrity
Make informed trade-offs between latency, consistency, and scalability in distributed systems
Identify bottlenecks early and continuously improve throughput, latency, and reliability
Own critical systems end-to-end, from design and implementation to behavior in production
Collaborate with experienced engineers to challenge assumptions, refine designs, and raise the technical bar
Strengthen engineering quality through code reviews, design discussions, and knowledge sharing

Who You Are

You have strong computer science fundamentals and substantial experience building reliable, observable, high-performance backend systems
You have experience designing and operating high-volume distributed systems
You think in terms of data integrity, concurrency, failure modes, and long-term maintainability
You understand scalability beyond infrastructure alone, including data modeling, caching, consistency, and concurrency control
You are comfortable making architectural decisions with long-term consequences
You take ownership of problems and drive them to a reliable outcome
You are curious, rigorous, and motivated to continuously improve both systems and engineering practices

Relevant Experience

Designing backend systems for high-throughput, low-latency, business-critical workloads
Distributed systems design, especially around consistency, partitioning, concurrency, and failure handling
Transactional data modeling and correctness guarantees in financial or otherwise high-integrity domains
API and service design for high concurrency and strict reliability requirements
Production observability, including metrics, tracing, structured logging, alerting, and performance analysis
Security-minded engineering, including authentication, authorization, secrets handling, secure service communication, and defensive design
Performance engineering across application, database, cache, and network layers
Operating services in production with strong reliability and incident ownership

Bonus Experience

Payments, fintech, gaming, trading, or other regulated or real-money transaction domains
Multi-region system design with low-latency routing and strong data integrity guarantees
Event-driven architectures, messaging systems, and idempotent workflow design
Postgres or other strongly consistent data stores in high-write environments
Caching and data-access strategies under strict correctness constraints
Containerized infrastructure and cloud-native operations
Infrastructure as code and automated delivery pipelines
Load testing, capacity planning, and performance regression prevention

This Role Is Likely Not for You If

You prefer clearly scoped implementation tasks over owning technical direction
You are uncomfortable making decisions with architectural or long-term design impact
Your experience with backend systems at scale is limited or surface-level
You tend to treat performance, scalability, or security as secondary concerns rather than core design constraints

How To Apply

Please send:

A short note on why this role is a strong fit for you
Your resume or LinkedIn profile
GitHub, portfolio, or code samples, if available
1-3 examples of backend systems or features you’ve built where scale, performance, security, or robustness were central, including the technical challenge, the system context, and your specific contribution

Our Benefits are

This is a 100% on-site position. Based in Stockholm, Sweden.

Senior Backend Engineer

Job Description