Senior/Staff Backend Engineer (Java)

Quick Facts

• Title: Senior/Staff Backend Engineer (Java)

• Work model: Remote (Poland)

• Contract: B2B

Description

You will own critical parts of a real-time AI risk decisioning platform used for fraud, credit, and compliance decision-making. The role focuses on building and scaling low-latency Java services, working with streaming and data systems, and ensuring reliable production operations.

Responsibilities

• Own features end to end: design, build, safely ship (GitHub Actions, feature flags via LaunchDarkly), and keep them running in production

• Build and scale Java services where latency and reliability directly affect customers

• Work on real-time streaming and data systems handling high event volumes with tight latency requirements

• Build reliable processes with workflow orchestration (e.g., Temporal)

• Make architecture and design decisions; write design docs

• Collaborate with product, frontend, and customer-facing teams before writing code

• Own production: monitoring, performance tuning, and root-cause fixes

• Raise the engineering bar via code reviews, knowledge sharing, and mentoring

Requirements

• 5+ years of backend development, with deep expertise in Java and its ecosystem

• Track record taking work from concept to production with minimal hand-holding

• Solid experience with low-latency, high-scale distributed systems in production

• Hands-on experience with AWS, microservices, and containers (Docker, Kubernetes)

• Experience with event streaming/data systems such as Kafka, ClickHouse, PostgreSQL, and Redis

• Understanding of API design and security best practices

• Strong written and verbal communication skills for async collaboration

Benefits

• Competitive pay: 32,000–47,000 PLN net/month + VAT (B2B)

• Remote-first culture with daily collaboration across Poland, Brazil, and the US

• AI-first, engineering-heavy environment with significant engineering and product ownership

• Family-friendly culture with regular team events and offsites

• Strong learning and professional development opportunities

• Latest equipment (MacBook or Linux machine)

• Contractor relationship: flat monthly fee; contractors can take time off with advance notice