Senior Backend Engineer

Company Description We’re building something new within Evolution. This is not an iteration on an existing product or a role focused on maintaining established systems. It is a chance to help define a new platform from first principles, with the technical bar set by the realities of global scale, real-money transactions, and the need for predictable behavior under load. The system we’re building will operate across regions and process thousands of real-money transactions per second with strict consistency guarantees. Low latency, correctness, performance, and security are not goals we optimize for later. They are design constraints from day one. This role is for engineers who want to shape core technical decisions in a small, high-caliber team. We optimize for talent density, clear thinking, and execution speed, not headcount.   Job Description   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   Qualifications   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 Additional Information   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 Competitive salary, pension, health and medical insurance 30 paid vacation days Fitness benefit (Friskvårdsbidrag) Professional growth Sport activities, parties, team buildings This is a 100% on-site position. 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