Senior Software Engineer - OTCTECH

As a Senior Software Engineer at Flow Traders, you will work with the OTCTECH team to transform the institutional trading platform across Equities, ETFs, Fixed Income, and Crypto. You will take ownership of complex problems from discovery through production, working directly with traders, quants, Operations, Risk, and Compliance to design and deliver a new OTC Trading Engine, automate operational workflows, and modernise existing applications into reliable, maintainable systems.

What you'll do

• Work directly with traders, quants, Operations, Risk, and Compliance to understand requirements and how trading workflows operate in practice.
• Trace business processes and data flows across pre-trade research, execution, post-trade processing, risk, and compliance.
• Identify opportunities to improve resilience, consistency, automation, and operational efficiency.
• Build a shared understanding of system responsibilities, dependencies, and operational considerations.
• Help design and deliver a new OTC Trading Engine spanning Equities, ETFs, Fixed Income, and Crypto.
• Define appropriate service boundaries, data models, interfaces, and event flows.
• Modernise existing applications where new business or engineering requirements create opportunities for improvement.
• Make and document architectural decisions, balancing performance, reliability, simplicity, and delivery speed.
• Design greenfield services and platforms that can be operated and evolved safely over time.
• Develop high-performance services, data pipelines, and integrations across Java, C++, and Python environments.
• Build event-driven systems using messaging and pub/sub patterns.
• Engineer for production from the outset, including testing, observability, failure handling, and operational support.
• Embed monitoring, root-cause analysis, and recovery mechanisms so issues are identified and resolved quickly.
• Take ownership of delivery from design and implementation through deployment and production operation.

What you bring

• Strong experience building and operating distributed backend systems in production
• Expert proficiency in Java or C++, with working knowledge of Python
• Strong understanding of distributed systems, concurrency, and scalable system design
• Experience with event-driven architectures and messaging platforms such as Kafka
• Proven track record building high-performance, low-latency systems
• Ability to translate complex business requirements into robust technical solutions
• Ownership mindset with strong stakeholder management and communication skills
• Experience with modern engineering practices including testing, code reviews, observability, and automation
• Comfortable leveraging AI tools to improve productivity while maintaining quality and accountability

Nice to have

• Experience in trading, capital markets, or financial services
• Exposure to Google Cloud Platform (GCP)
• Experience with Kubernetes, Docker, and cloud-native technologies
• Knowledge of BigQuery or large-scale data platforms
• Experience working in low-latency, high-throughput environments

What we offer

• 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 a nutritionist or personal trainer
• Bi-weekly massages
• Annual company trip and a variety of events throughout the year
• Global rotations across offices worldwide
• Competitive salary and annual discretionary profit share
• Comprehensive benefits

About Flow Traders

Flow Traders is transforming its institutional trading platform, creating conditions for high-performing people to do their best work. The company maintains a close-knit, small-company feel while offering competitive compensation, comprehensive benefits, and a collaborative, non-hierarchical culture.