Senior or Mid Backend Software Engineer (m/f/d)

Das ist der Job

Tech stack you’ll work with • Core: Golang, AWS Serverless (Lambda, API Gateway, SQS) • Data: DynamoDB, PostgreSQL • Messaging: Kafka • Ops / Tooling: Terraform, Guthub Actions (CI/CD) (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 • 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. • 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.

Darum lohnt es sich

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 B2B • Multisport card Apply now!

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 B2B / Employment contract Location Hybrid (Warsaw – in-office every Tuesday & Thursday) Why us? Apply now! About us Tradevest is a leading FinTech company offering an innovative platform for securities and cryptocurrency trading, specifically tailored for institutional clients.

In Germany, Tradevest holds BaFin licenses as a securities institution, ensuring full regulatory compliance. With our cutting-edge development hub located in Warsaw, Tradevest Polska Sp. z o.o. we drive the technical innovation behind our products.

Additionally, through our brand WAWEX, we operate a state-of-the-art cryptocurrency exchange, providing a seamless and secure trading experience. Our mission is to empower institutional traders with advanced tools and technologies that redefine the trading landscape.

WAWEX is a cutting-edge fintech platform at the forefront of the digital finance revolution. Empowering financial institutions, brokers, and banks, WAWEX delivers seamless access to over 75 cryptocurrencies, combining state-of-the-art security with unparalleled market depth.

Through innovative tokenization and real-time market insights, WAWEX is shaping the future of trading. With robust API integrations and 24/7 availability, this dynamic platform is designed for institutions ready to embrace the fast-paced world of digital assets and unlock limitless opportunities in global finance.