Top Python Jobs in London

Build and maintain scalable Python backend microservices: productionize data science prototypes, fix production issues, improve monitoring, and ensure tested, well-documented code following engineering best practices.

As a Senior Data Engineer, you will design data pipelines, collaborate with teams, build demos, and improve data processes within a cloud-native environment.

Build and automate end-to-end GTM systems across marketing, CRM, sales engagement, and analytics. Design scalable workflows, integrations, and automations, embed AI for lead scoring and prioritisation, improve data quality and reporting, and enable Sales, Partnerships, and Customer teams via training and tooling. Partner with Engineering and Commercial teams to deliver and optimise revenue-driving systems.

Provide first-line technical support for Forter customers: manage and resolve inbound tickets to SLAs, troubleshoot platform issues, collaborate with engineering and product teams to identify bugs and implement solutions, train clients, standardize documentation, document resolutions, set follow-ups, and participate in on-call rotations.

Maintain and scale data and ML infrastructure, build CI/CD pipelines, implement observability, ensure high availability and disaster recovery, manage access and secrets, troubleshoot incidents, and provide 24/7 coverage across time zones.

Lead technical strategy and roadmap for developer productivity infrastructure. Design and build scalable, reliable distributed systems, build environments, package/dependency management, CI/CD and developer tooling to enable fast, reproducible builds and improve engineering workflows across a large monorepo.

Produce ecommerce insights across the customer journey using SQL and Python. Build cohort, LTV, segmentation, funnel and A/B test analyses. Create Looker dashboards, partner with product/commercial/data engineering, surface data quality gaps, and translate findings into actionable recommendations for stakeholders.

Generate ecommerce insights across the customer journey through cohort analysis, segmentation, LTV modelling, funnel and A/B test analysis. Track core ecommerce metrics, evaluate feature and pricing performance, build Looker dashboards, and collaborate with product, commercial and data engineering teams to translate analytical findings into actionable recommendations for stakeholders.

Lead design and deliver scalable XVA risk software, embed AI/ML and Generative AI into workflows, own projects end-to-end, drive architecture and Agile delivery, ensure regulatory compliance, and mentor engineering teams.

The role involves creating realistic simulations for visual effects including particles, fluids, and cloth using Houdini and Maya, while collaborating with others to enhance the final output.

First-line support for a high-performance research and trading platform: monitor alerts and logs, triage and resolve infrastructure incidents, handle onboarding and environment requests, maintain runbooks, improve monitoring and automation, escalate complex issues, and participate in on-call rotation to ensure platform reliability and responsiveness.

Design, build, and deploy AI-powered solutions (LLMs, RAG, agents) to improve productivity and operational efficiency. Partner with business teams to define use cases, integrate AI with enterprise systems, create production-ready prototypes, and ensure solutions meet governance, security, and responsible AI standards.

Lead quality efforts within an embedded product team: define test strategy, shift-left QA, build/maintain test automation frameworks, test web, mobile and backend systems, coach engineers, and drive process, tooling and documentation improvements.

Lead web analytics strategy and a team to ensure robust data collection, transformation, and reporting across platforms (GA4, Adobe, Mixpanel). Oversee technical setup, tag management, measurement frameworks, and stakeholder reporting to drive digital performance and client growth. Collaborate with data, tech, and client teams to deliver scalable, secure analytics solutions and mentor staff.

Provide architectural leadership for Railpen's data ecosystem, defining enterprise data architecture standards, modelling, integration patterns, and platform design. Ensure scalable, secure data platforms supporting Member Services, Finance, and Pension Investment Management. Govern data solutions, guide engineers, and collaborate across teams to deliver data warehousing, ETL/ELT, reporting, and analytics capabilities aligned with technology and AI strategy.

Centralise and clean People data in Elmo, build recurring reports and at least one dashboard, and create automated workflows (using Elmo API, Zapier/Make or similar) to flag missing documents and trigger scheduled reports. Collaborate with managers to resolve data gaps and hand over documentation for ongoing maintenance.

Design, build, deploy, and support secure, scalable production software and AWS infrastructure. Implement CI/CD with GitHub Actions, monitoring and alerting, and maintain engineering standards. Work in a cross-functional Agile team, mentor colleagues, and improve processes to ensure stable, repeatable releases.

The Senior Software Engineer will develop and maintain a large-scale calculation engine, mentor other developers, optimize performance, and support customer needs for distributed calculations.

Lead pricing for Financial Lines and Cyber across EMEA, manage a small actuarial team, develop and calibrate exposure and experience rating models, support case pricing, forecasting, underwriting risk parameterisation, reinsurance submissions, and actuarial/analytics projects to drive profitable portfolio performance.

Design and build scalable backend services and data pipelines in Python, deploy with Docker/Kubernetes, integrate enterprise systems (ERP, APIs, SFTP, event buses), process multi‑terabyte datasets, implement CI/CD and infra-as-code, ensure observability and reliability, and collaborate with customers and ML teams to deliver production enterprise features.

Develop and scale APIs, web services, and internal content systems for high-traffic public-facing radio products. Collaborate in cross-functional teams, write tests, follow CI practices, and apply sound software engineering principles while learning new technologies.

Develop, optimize, and maintain high-performance C#/.NET applications for equity derivatives technology risk. Design scalable systems, write comprehensive unit tests, profile and resolve performance bottlenecks, integrate messaging and web technologies, and collaborate with global teams on large, complex financial projects.

Manage and develop Citi's electronic execution platform for cash equities, coordinating cross-functional teams to enhance trading solutions and ensure regulatory compliance.

The Software Engineer will manage data collection for model training, operate cloud infrastructure, and collaborate on data management strategy to enhance Speechify's AI capabilities.

Work on platform engineering to build, automate and maintain cloud infrastructure and platform components; support operational excellence through on-call rotations, incident management, CI/CD, monitoring, and BAU; collaborate with engineering and data teams to design secure, scalable systems and reduce operational toil.