Senior Python Engineer - Quantitative Trading - Selby Jennings

eFinancialCareersLondonreedpublished 09/21/2026
Must-have:PythonBackend

KeyResponsibilities

  • Design,buildandmaintainbusiness-criticaltradinginfrastructureandbackendservices.
  • Developsystemsacrosstradecapture,positionmanagement,reconciliationandsettlementworkflows.
  • Buildscalabledataplatformstosupporttrading,riskandoperationalprocesses.
  • Createinternaltoolingusedbytraders,quantitativeresearchersandoperationsteams.
  • Improvetheperformance,reliabilityandscalabilityofexistingsystems.
  • Collaboratecloselywithstakeholdersacrossengineering,trading,quantitativeresearchandoperations.
  • Takeownershipofprojectsfromdesignthroughtoproductiondeploymentandsupport.
  • Contributetoarchitecturaldecisionsandengineeringbestpracticesacrosstheplatform.
  • Troubleshootcomplexproductionissuesandcontinuouslyimprovesystemresilience.

Key Requirements

  • Strong commercial experience developing software in Python.
  • Experience within trading, market making, electronic trading or financial markets technology.
  • Strong knowledge of Linux environments and operating systems.
  • Solid SQL and PostgreSQL experience.
  • Experience building and operating production-grade backend systems.
  • Exposure to market data, execution systems, position management, reconciliation or settlement platforms.
  • Knowledge of C++ or other performance-oriented languages.
  • Strong understanding of software engineering fundamentals, design patterns and system architecture.
  • Experience working with distributed systems, messaging platforms or event-driven architectures.
  • Excellent problem-solving skills and ability to work independently.
  • Comfortable working directly with technical and non-technical stakeholders.