Senior or Mid Backend Software Engineer (m/f/d)
Veröffentlicht am
Stellenbeschreibung
Tech stack you’ll work with
(If you haven’t touched every tool yet, no worries — we’ll get you up to speed.)
Your mission and responsibilities
Mid Backend Software Engineer
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Implement new micro-services and extend existing ones in Go.
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Help groom user-story requirements and surface performance / scaling concerns early.
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Write unit, integration and API tests; review PRs.
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Tune data-models in DynamoDB & Postgres for low-latency, high-throughput workloads.
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Pair with DevOps on CI/CD and observability improvements.
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Participate in on-call rotation as we’re building high available fintech system
Additional tasks of the Senior
- 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.
- Be a mentor to less experienced colleagues
Your qualifications and experience
- 3+ years of professional back-end experience (ideally 1 year+ in Go).
- 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.
- Ability to work on-site in Warsaw twice a week (Tue & Thu) and remotely otherwise.
Nice to have
- Exposure to serverless architectures on AWS.
- Experience with Kafka or another high-volume message bus.
- Knowledge of automated trading, market data, or FIX/crypto exchanges.
- Familiarity with Infrastructure-as-Code (Terraform or CDK).
Contract
B2J / Employment contract
Location
Hybrid (Warsaw – in-office every Tuesday & Thursday)
Why us?
What We Offer:
- An experienced, welcoming team that loves clean, well-tested code.
- Real impact: the features you ship go straight into production for live traders.
- Flexible hours, modern tooling, and a fintech domain that’s never boring.
- Occasional work travel to Germany (Munich / Berlin)
- 20 days PTO on B2J
- Multisport card