As a Senior Backend Engineer, you’ll play a key role in building the backend of our high-performance fintech platform, designed to handle thousands of real-time trading operations per second. You’ll be responsible not only for delivering clean, scalable code, but also for shaping the architecture, driving technical decisions, and mentoring less experienced engineers.
Tech stack you’ll work with
Core: Golang, AWS Serverless (Lambda, API Gateway, SQS)
Data: DynamoDB, PostgreSQL
Messaging: Kafka
Ops / Tooling: Terraform, Gitlab Actions (CI/CD)
(If you haven’t touched every tool yet, no worries — we’ll get you up to speed.)
responsibilities :
Implement new micro-services and extend existing ones in Go.
Help groom user-story requirements and surface performance / scaling concerns early.
Write unit, integration and API tests; review PRs.
Tune data-models in DynamoDB & Postgres for low-latency, high-throughput workloads.
Pair with DevOps on CI/CD and observability improvements.
Design and drive high-scale, low-latency services (tens of thousands of orders / sec).
Lead architecture reviews, challenge assumptions and keep tech debt in check.
Partner with Product on roadmap feasibility & effort sizing.
requirements-expected :
5 years of professional back-end experience (ideally 2 years+ in Go)
Exposure to serverless architectures on AWS
Solid grasp of cloud-native design (RESTful APIs, event-driven patterns)
Working SQL and NoSQL skills; know when each shines
Comfort diagnosing performance bottlenecks in distributed systems
Experience with Kafka or another high-volume message bus
Familiarity with Infrastructure-as-Code (Terraform or CDK)
offered :
Hybrid model – 2 days/week in office in Warsaw
B2B or Employment Contract
20 days paid time off on B2B
Multisport card and other benefits
Occasional work travel to Germany (Munich / Berlin)
A seasoned team that values clean, well-tested, maintainable code
True product impact — your features will go straight to production
Modern stack, flexible hours, and a challenging fintech domain
