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What You'll Be DoingAs a Senior Python Engineer, you'll be responsible for designing, developing and enhancing the batch processing and operational systems that support one of the world's leading exchange operators. You'll: Design and build robust, highly reliable Python applications that underpin Client's Europe's trading operations. Collaborate closely with Product, Business Development and Sales teams to create innovative new exchange services and features. Champion software craftsmanship through clean architecture, maintainable code and rigorous testing practices. Participate in research and development initiatives, evaluating and implementing emerging technologies that can drive competitive advantage. Support critical production systems as part of a rotating support rota, responding to incidents and contributing to root cause analysis and continuous improvement initiatives. Work alongside talented engineering teams across our global organisation, sharing knowledge and driving technical excellence. What We're Looking ForEssential SkillsStrong commercial experience with Python development. Passion for writing clean, maintainable and testable code. Solid understanding of Linux environments. Experience with SQL and advanced database querying techniques. Strong grasp of algorithms, data structures and software engineering fundamentals. Computer Science degree or equivalent technical background. Highly DesirableExperience with Test-Driven Development (TDD), Behaviour-Driven Development (BDD) or similar testing methodologies. Experience implementing AI-enabled software development lifecycles and practical use of modern engineering tools such as Claude Code, OpenAI Codex, or similar AI-assisted development platforms. Preferred ExperiencePostgreSQL and/or Snowflake. Modern Python web frameworks including Django, Flask or FastAPI. Event-driven architectures and streaming technologies such as Apache Kafka. Data orchestration and pipeline platforms such as Apache Airflow. Java development experience. Financial technology experience, including market data, order management, algorithmic trading, exchange technology, financial systems integration, regulatory compliance or related domains. To find out more about Huxley, please visit Huxley, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC387148 England and Wales

Essential SkillsExpert-level Python development experience. Strong commitment to writing clean, maintainable and testable code. Advanced SQL knowledge and database optimisation experience. Deep understanding of Linux environments. Excellent knowledge of algorithms and data structures. Proven experience leading technical projects and mentoring engineers. Degree in Computer Science or a related technical discipline, or equivalent commercial experience. Highly DesirableExperience with Test-Driven Development (TDD), Behaviour-Driven Development (BDD) or similar testing methodologies. Knowledge of PostgreSQL and/or Snowflake. Experience with modern Python web frameworks such as Django, Flask or FastAPI. Familiarity with event-streaming technologies including Apache Kafka. Experience building data pipelines using Apache Airflow. Exposure to Java development. Why Join?Work on cutting-edge electronic trading technology. Influence the architecture of business-critical systems. Lead projects with real commercial impact. Collaborate with high-performing engineering teams across Europe and the US. Gain exposure to complex, high-throughput, low-latency environments. Grow your leadership and technical expertise in a challenging and rewarding setting. To find out more about Huxley, please visit Huxley, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC387148 England and Wales

A leading organisation is seeking a Regulatory Reporting Engineer to join their team on a contract basis, working onsite in London. In this role, you will be responsible for designing and developing technology solutions that address global trade and transaction reporting requirements. You will work closely with engineering, compliance, operations, and business stakeholders to ensure that regulatory obligations are translated into robust, scalable technical implementations. Your primary responsibilities will include designing, developing, testing, and deploying regulatory reporting applications and data pipelines. You will build solutions that model complex trading workflows and business processes, and maintain systems that support global reporting standards. Investigating reporting exceptions, reconciling data discrepancies, and implementing automated solutions to enhance accuracy and efficiency will be key aspects of your role. You will also optimise data processing frameworks and support the full software development lifecycle, including production monitoring and troubleshooting. Leveraging modern data engineering technologies and AI-enabled workflows to improve automation and control frameworks is expected. The ideal candidate will hold a bachelor's degree in Computer Science, Engineering, or a related technical field, and demonstrate strong professional experience developing software in Python. Expertise in SQL and relational databases, as well as a solid understanding of software engineering principles, system design, and data architecture, are essential. Experience building scalable data processing solutions and distributed systems is highly valued. Strong analytical, problem-solving, communication, and collaboration skills are required. Preferred qualifications include experience in regulatory or transaction reporting, financial controls, or highly regulated environments, as well as knowledge of financial markets and trading systems. Familiarity with cloud platforms, modern data engineering technologies, AI-enabled workflows, and large-scale financial datasets will be advantageous. Please click to find out more about our Key Information Documents. Please note that the documents provided contain generic information. If we are successful in finding you an assignment, you will receive a Key Information Document which will be specific to the vendor set-up you have chosen and your placement. To find out more about Huxley, please visit Huxley, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC387148 England and Wales

Site Reliability Engineer with Python Our Client looking to bring on a site reliability engineer to help deploy, manage, troubleshoot, and enhance our complex cloud-based set of internal tools and externally managed services for a variety of users across our wide-ranging organization. You will have at least 7 to 10 years hands-on expertise working as a Site Reliability Engineer. You will work closely with IT, product, and engineering to extend and maintain this set of tools and services and to help debug and resolve problems. In addition, the ideal candidate will proactively look for system weaknesses and find ways to resolve them before they can cause production issues via monitoring and data we aggregate through various tools within our organization's IT & DevOps toolkit. Responsibilities ●Keep our suite of internal apps and services up and running or getting it back up and running quickly if a failure were to occur ●Be the technical point person of operational responsibility for two core platforms (one mobile and one web application) i.e. engaging as appropriate upon escalations from the IT support group whether it be problem solving, addressing production issues, enhancing features etc. - collaborating with engineers and others as needed ●Work closely with internal partners and teams as well as external vendors to ensure that we ship software that meets our code quality, security and performance requirements ●Write, update, and use our documentation, including runbooks and/or playbooks ●Help automate existing or build new internal workflows including ongoing infrastructure needs, testing, failover mitigations, and more ●Debug complex problems across our entire web and mobile application stack and advise key stakeholders on solutions, as well as implement said solutions if appropriate. ●Further our internal CI/CD processes to improve release cadence and developer experience ●Participate in the daily / weekly software development process (standups, sprint planning, retros, issue tracking, etc.) ●Actively lead any critical issue post-mortem processes, including coordination of any meetings and further steps to take Qualifications ●7+ years experience with software engineering, software development, and/or system operations ●Experience debugging complex problems and implementing timely cost-effective solutions ●Experience designing, building, and operating large-scale production systems ●Deep knowledge of Python is preferred, though other languages like Java, Go, Rust, or similar will also be heavily considered ●Experience using source control (Git, GitHub) and feature branching strategies ●Experience with a variety of open-source databases (MySQL, Postgres, Redis, etc.) ●Experience with DevOps engineering and working with container orchestration, such as with Docker or Kubernetes ●Experience with log monitoring and observability via platforms like Sumologic or Cloudwatch ●Experience automating infrastructure, testing, and deployments using tools like CircleCI Configuration management tooling and infrastructure as code knowledge is preferred but not required ●Experience working with AWS services, with knowledge of Azure / Google ecosystems helpful but not required ●Strong familiarity with general modern web and mobile application development, including hands-on experience working with JavaScript (Typescript preferred) and Python stacks ●Cross functional team collaboration experience, especially working with engineers and user experience / product designers, as well as external stakeholders ●Strong skills for weighing and managing scope, risk, quality and timelines ●Strong focus on quality, security, performance, and end user experience This is an exciting position with an exciting organisation based in Central London and New York. The position can be London or New York based. The salary for this position will be circa £80K - £100K. Do send your CV to us in Word format along with your salary and notice period.