Senior Software Engineer - Backend Platform

Responsibilities

• Build and evolve backend services and platform components using Java and Spring Boot
• Design APIs, data models, transaction flows, internal tools, and product-facing systems
• Design and build Kafka-based event-driven services and high-throughput transaction flows
• Design event flows with careful attention to ordering, idempotency, retries, failure handling, and data consistency
• Build systems using PostgreSQL where performance, correctness, and data integrity matter
• Deploy and operate backend services in Kubernetes-based production environments
• Drive technical decisions around consistency, latency, scalability, reliability, and security
• Make informed trade-offs between correctness, performance, complexity, and long-term maintainability
• Identify bottlenecks and continuously improve throughput, latency, observability, and system quality
• Own critical systems end-to-end, from design and implementation to production behaviour
• Strengthen engineering quality through code reviews, design discussions, and knowledge sharing

Requirements

• You have strong computer science fundamentals
• You have substantial experience building reliable, observable, high-performance backend systems
• You are comfortable working with distributed systems, databases, and production services
• You can reason clearly about correctness, concurrency, failure modes, performance, and system design
• You understand scalability beyond infrastructure alone, including data modelling, consistency, caching, and concurrency control
• You are comfortable making architectural decisions with long-term consequences
• You take ownership of problems and drive them to reliable outcomes
• You want to work in a small team with high standards and direct technical feedback
• What Will Strengthen Your Application
• Strong professional experience with Java and Spring Boot
• Strong experience with Kafka or similar event-streaming/message-driven systems
• Experience designing event flows with careful attention to ordering, idempotency, retries, failure handling, and data consistency
• Strong understanding of PostgreSQL, relational database design, transactions, indexing, and query performance
• Strong experience deploying, operating, or troubleshooting backend services in Kubernetes-based production environments
• Experience designing backend systems for high-throughput, low-latency, business-critical workloads
• Experience with distributed systems design, especially around consistency, partitioning, concurrency, and failure handling
• Experience with transactional data modelling and correctness guarantees in financial, gaming, trading, payments, or other high-integrity domains
• Experience with production observability, including metrics, tracing, structured logging, alerting, and performance analysis
• Security-minded engineering, including authentication, authorisation, secrets handling, secure service communication, and defensive design
• Clear communication and the ability to discuss technical trade-offs thoughtfully
• Bonus Experience
• Payments, fintech, gaming, trading, or other real-money transaction domains
• Multi-region system design with low-latency routing and strong data integrity guarantees
• Caching and data-access strategies under strict correctness constraints
• Infrastructure as code and automated delivery pipelines
• Load testing, capacity planning, and performance regression prevention
• Incident response and production reliability ownership
• 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, reliability, or security as secondary concerns rather than core design constraints
• 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, using modern backend technologies to solve hard engineering problems under real production constraints.
• 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 optimise for later. They are design constraints from day one.
• We are looking for senior engineers who want to work close to the core of the platform: backend services, event-driven systems, databases, production infrastructure, and performance-critical product flows.
• Our benefits are
• Competitive 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. Based in Stockholm, Swed

Benefits

Additional Information

What You'll Work With You will work with a backend stack centred around: Java Spring Boot Kafka PostgreSQL Kubernetes

Your Match

How well this role fits your profile.

Company Intel

What employees say

Worked at Evolution? Share your experience