OTC Trading Software Engineer
STS Digital (www.stsdigital.io) is a leading regulated digital asset trading firm specialising in OTC trading and market making. While trading is headquartered in Bermuda, technology development is provided by a vibrant global engineering team.
We are looking for a Software Engineer to join our OTC Trading Technology (OTC) team, which builds and maintains systems that power our OTC Spot and Options RFQ trading, structured products, and client-facing services. This includes our internal trading platforms, client portal, APIs, and integration with pricing and risk systems. The position will report to the OTC Team Lead.
Primary Responsibilities
• Design, implement, test, deploy, and maintain OTC trading systems (primarily in C#) supporting Spot, Options, and Structured Products workflows.
• Build and enhance API services (REST, WebSocket, FIX 4.4) used by clients and internal trading systems.
• Work closely with traders, quants, and other engineers to deliver performant, secure, and scalable solutions.
• Collaborate with the Principal Engineer and team leads to ensure systems meet engineering standards and business objectives.
• Contribute to development of the Client Portal, Admin Portal, and RFQ trading engines.
• Integrate with quantitative pricing models, market data, and downstream systems.
• Investigate and resolve production issues promptly, ensuring minimal impact on trading operations.
• Participate in code reviews, regression testing, and performance tuning of trading workflows.
• Contribute to continuous integration and delivery pipelines using GitHub and ArgoCD.
• Support infrastructure deployment and troubleshooting within AWS.
More Info
STS Digital provides trading solutions and market making for digital assets. As our client base and trading volumes grow, the OTC Trading Technology team is at the forefront of developing and maintaining systems that underpin our trading business. This is a hands-on engineering role focused on building robust and responsive trading systems that operate in a fast-paced environment.
We are seeking a proactive engineer who takes ownership of deliverables, works collaboratively across teams, and thrives in solving complex technical challenges that directly impact trading performance and client experience.
Expected Qualifications
• 3+ years’ experience in software engineering, ideally with C#.
• Solid understanding of trading technology and API-driven systems.
• Prior experience in financial markets, preferably OTC or RFQ trading systems.
• Strong problem-solving skills and a structured approach to design, troubleshooting, and debugging.
• Exposure to cloud and containerised environments (ideally AWS and Kubernetes/EKS).
• Good verbal and written communication skills; comfortable working with traders and cross-functional stakeholders.
• Fluent in English, both written and spoken.
Beneficial
• Experience with Python and React.
• Detailed experience with AWS (EKS, EC2).
• Experience working on real-time or low-latency distributed systems.
• Familiarity with quantitative pricing integration and automated testing frameworks.
• Understanding of risk management, order management systems (OMS), and trade lifecycle workflows.
• Experience building FIX or WebSocket APIs for trading.
• Options and structured products experience.
Our Tech Stack
• Backend: C#, Python
• Frontend: React
• Databases: PostgreSQL, DynamoDB
• Infrastructure: AWS (EKS, EC2)
• Version Control & CI/CD: GitHub, ArgoCD
This role offers an exciting opportunity to build mission-critical trading systems that directly support STS Digital’s OTC trading business. You will gain deep exposure to RFQ trading workflows, pricing integration, and client systems while contributing to a world-class digital asset trading platform.