Technical Lead - Capital Markets

Lenstra was founded by passionate computer science engineers with a proven track record of delivering high-quality solutions. By combining technical excellence with a strong vision, we support top-tier clients across industries such as Banking & Insurance, Luxury, and Technology.

Our expertise is structured around four core pillars: Software Development, DevSecOps, Data & AI, and Product . Through a holistic understanding of our clients’ environments, we help them address their most complex challenges—from building robust software and secure cloud platforms to designing data-driven solutions that accelerate business impact.

We are looking for a Tech Lead to join a mission-critical Middle Office platform supporting trading and portfolio operations within a major Capital Markets environment .

This role sits at the center of the post-trade ecosystem , covering allocation workflows, trade lifecycle, and position management , while driving the modernisation of the platform toward a Python-first architecture .

You will combine production leadership, system reliability, and strategic transformation projects in a high-impact environment.

Role:

Own critical post-trade systems

• Become quickly operational on Middle-Office allocation workflows
• Ensure the continuity and reliability of the allocation platform

Production leadership

• Deliver actionable Root Cause Analysis (RCA) and ensure fixes are implemented
• Improve monitoring, alerting, and operational processes

Drive Python-first modernisation

• Lead migration of business logic from Oracle / PL-SQL to Python
• Deliver structural refactors improving maintainability and robustness
• Reduce technical debt across allocation and production systems

Enable operations & support

• Build delegation frameworks with Front-Support / Operations teams
• Create runbooks, incident notebooks, and documentation
• Improve operational autonomy through monitoring and guardrails

Contribute to strategic execution programs

• Participate in major Capital Markets initiatives around execution and allocation platforms
• Identify dependencies, risks, and integration points
• Help secure robust production releases

Skills needed:

• 10–15+ years experience working on critical systems in Capital Markets
• Strong knowledge of Middle-Office / Post-Trade processes
• Proven ability to work on complex trading systems in production
• Strong technical background in Python and system design
• Experience interacting with Trading Support, Operations, and Portfolio teams

Nice to have

• Experience migrating Oracle / PL-SQL systems to Python
• Experience with allocation or execution platforms
• Experience using GenAI tools for engineering productivity

Location: This job is based in Paris, on a hybrid set-up (3 days onsite, 2 days at home).

Our recruitment process consists in 3 interviews: