Flow Traders is building the next generation of its post-trade platform, covering trade capture, reconciliation, settlement, booking, reporting, and operational workflows across Equities, ETFs, Fixed Income, and Crypto. We are looking for a Senior Software Engineer to take end-to-end ownership of key post-trade domains, helping shape the platform architecture while building reliable, automated, and data-driven services. This role is ideal for an engineer who enjoys solving complex problems, thinking in systems, and building high-quality platforms that deliver real business impact. What you will do • Own and develop critical post-trade domains such as reconciliation, settlement, booking, and reporting • Work closely with Trading, Operations, Risk, Compliance, and Data teams to understand workflows and requirements • Design and build scalable backend services and data pipelines • Improve automation, data quality, resilience, and operational efficiency • Contribute to the target architecture and technical roadmap of the post-trade platform • Ensure observability, reliability, and data correctness across systems   What you need to succeed • 5+ years of experience building distributed backend systems using Java or C++, with exposure to Python • Strong understanding of distributed systems, data structures, algorithms, and event-driven architectures • Experience with messaging technologies such as Kafka • Hands-on experience building data-intensive systems, ETL pipelines, and analytical data solutions • Strong SQL and data modelling skills • Proven ability to own complex technical domains from design through production support • Strong stakeholder management and communication skills Nice to have • Experience with post-trade workflows, including reconciliation, settlement, booking, or regulatory reporting • Background in financial services, proprietary trading, or market making • Experience with GCP, Kubernetes, CI/CD, Airflow, Spark, Flink, or similar technologies • Knowledge of observability tools such as Prometheus, Grafana, or OpenTelemetry What we offer At Flow Traders, we create the conditions for hard‑working, high‑performing people to do their best work. From a thorough onboarding and ongoing access to Flow Academy, to latest technology and a collaborative, non‑hierarchical culture, we give you the tools, ownership, and support to move fast and drive outcomes. We keep a close‑knit, small‑company feel while offering competitive salary, annual discretionary profit share, and comprehensive benefits, so talent can grow here, and stay here. See our benefits below: • Flow Academy and opportunities to attend domain-related conferences • Daily catered lunch, great coffee, and a fully stocked kitchen and snack bar • In-house Bar and Lounge with arcade, table tennis, billiards, and game consoles • Company boat • In-house gym and sessions with our nutritionist or personal trainer • Bi-weekly massages • Annual company trip and a variety of events throughout the year, such as the New Years Event • Global rotations across our offices worldwide • and more This role may require participation in an on-call rotation outside normal business hours and on applicable National Holidays. Employees on call must remain available to respond to urgent matters necessary to ensure business continuity or 24/7 coverage of trading activities. On-call duties, scheduling, and compensation are governed by the applicable company policy, arrangements, and Dutch labour-law requirements.   Flow Traders does not accept unsolicited resumes from any professional staffing or search firms. All resumes, and any other information identifying potential candidates, submitted to any employee at Flow Traders via-email, the Internet or directly without a valid and signed search agreement will be deemed free to contact by Flow Traders without any restrictions and no placement fee of any kind will be paid in the event the candidate is hired by Flow Traders