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.

Job Description

What You’ll Work With

You will work with a backend stack centred around:

Java
Spring Boot
Kafka
PostgreSQL
Kubernetes

What You’ll Do

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

Qualifications

Who You Are

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

Additional Information

We’re building something new within Evolution.

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, Sweden.

Senior Software Engineer – Backend Platform

Job Description