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

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

Contract B2B / 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 B2B
• Multisport card

Apply now! Apply now!

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).

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.