C++ and Python Developer at LMAX | London

Role Overview LMAX is looking for a C++ and Python Developer to join the Middle-Office Team in London. This group works closely with infrastructure, research, and treasury colleagues to evolve trade reconciliation, back-testing frameworks, and trading monitoring systems. The primary focus is on data engineering and the design and implementation of trading systems. Finance or trading experience is not required for this position. How This Team Works The codebase combines C++ (used by infrastructure) and Python (used by research for analysis and automation). This new team aims to bridge both languages, making integration and collaboration central to the role. Performance and Optimization Handling financial data brings unique technical challenges, especially around throughput. The team puts a strong emphasis on software performance without sacrificing maintainability. Developers work deep within the systems to understand and improve them. Testing Approach Comprehensive test suites are critical here. Testing covers everything from unit tests to full end-to-end simulations, running every 15 minutes on the CI system for fast feedback. There are no overnight waits for test results at LMAX. What You Will Do Write clear, well-structured, and thoroughly tested code in C++ and Python. Develop high-throughput software solutions. Pair program to share knowledge and avoid silos. Design and implement features to improve safety, performance, and usability. Create interface code connecting C++ and Python (using pybind). Required Skills and Experience Strong C++ skills, especially with modern C++ in Linux or UNIX environments. Python development experience, including Numpy, Pandas, and SQL. Experience with automated testing for both C++ and Python. Ability to understand business requirements and build matching systems. Skilled at designing simple, well-documented, and maintainable systems. Comfortable working independently with minimal supervision. No finance or trading background necessary. Bonus Skills Experience with test-driven development and testing at multiple system levels. Location London, England, United Kingdom

Talan is looking for a Python Developer to join its London office. This position centers on building and maintaining applications for a variety of client projects. The work includes both new software development and ongoing support, with a strong emphasis on delivering solutions that meet business needs. Key responsibilities Design, develop, and maintain Python-based applications Collaborate with colleagues across different teams to achieve project objectives Take part in planning and implementing technical solutions Support existing systems and address issues as they come up Role overview This role involves hands-on development as well as troubleshooting and supporting live systems. Working in a collaborative environment, the Python Developer will contribute to projects that serve a diverse group of clients.

Role Overview Talan is looking for a C# Developer in London. This role focuses on building, testing, and maintaining reliable software applications using C#. The position involves hands-on programming and close collaboration with colleagues from different teams. What You Will Do Develop and maintain software applications in C# Test new features and ensure software quality Work with cross-functional teams to gather requirements and design architecture Help implement systems that align with business goals Location This position is based in London.

Join our innovative team as a C# Developer, where you will design and implement cutting-edge software solutions that drive our projects forward. You will work closely with cross-functional teams to create robust applications, ensuring high performance and responsiveness. If you are passionate about coding and eager to tackle complex challenges, we want to hear from you!

About WintermuteWintermute is a pioneering technology firm and one of the foremost algorithmic trading companies specializing in digital assets. Our mission is to provide liquidity across a diverse range of cryptocurrency exchanges and trading platforms. We also offer comprehensive OTC trading solutions while supporting prominent blockchain initiatives and traditional financial institutions transitioning into the crypto space. Additionally, Wintermute Ventures invests in early-stage DeFi projects, further enhancing our influence in the industry.Founded in 2017, Wintermute has adeptly navigated through various industry cycles. We blend the high-frequency trading standards of traditional markets with the innovative spirit of technology startups. At Wintermute, we are committed to harnessing the disruptive potential of blockchain technology, maintaining a long-term perspective on the digital asset market, and leading the way in establishing a compliant and innovative trading environment. To learn more, please visit our website.Join Our TeamWe are on the lookout for a passionate C++ Quant Developer who thrives on technology and possesses a keen interest in both the intricate details of computer hardware and the overarching design of expansive systems, including data infrastructure. The ideal candidate enjoys exploring the inner workings of technology, has a solid understanding of data structures, and possesses experience in developing client-server network applications and optimizing high-performance code. We value prior experience from personal projects as well as professional backgrounds. A PhD in mathematics is common among our Quant Developers, and a solid grasp of mathematical concepts is essential. An interest in algorithmic and quantitative trading is a bonus.At Wintermute, you will have the unique opportunity to directly influence our trading activities by developing and enhancing various aspects of our trading platform, data infrastructure, and related software. You will receive guidance from seasoned developers and traders, including our founders. Expect immediate responsibility and independence, enabling you to learn at an unparalleled pace! We operate without legacy systems, bureaucratic hurdles, or multiple approval layers; all developers report directly to our hands-on CTO. The impact you make is truly up to you!

Join Mustard Systems, where we harness the power of statistical modeling to analyze sports events, enabling accurate predictions of future outcomes. By leveraging our proprietary datasets, sophisticated statistical models, and custom software solutions, we aim to deliver precise forecasts in the world of sports.We prioritize speed and real-world impact over perfection in code. If you are an engineer who excels at rapid problem-solving and thrives in a flexible, outcome-oriented environment, you'll find a home with us.Your Role:Enhance our connections to new liquidity providers using advanced web scraping and reverse engineering techniques.Create and maintain low-latency, real-time data feeds to support trading strategies based on extracted data.Improve system visibility for teams to gain insights into integration challenges and enhancements.Our agile methodology allows us to adapt plans as new information and opportunities arise. Developers play a pivotal role, taking complete ownership of their software from design through development, testing, review, and production support.Key Responsibilities:Design and Implement Impactful Features: Develop features that align with our business objectives, ensuring high-quality code that delivers measurable value.Collaborate on Code Quality: Review and test peer code to uphold functionality, maintainability, performance, and quality standards.Production Support: Take charge of your team’s software in production, ensuring stability and prompt resolution of any issues.Cross-Team Collaboration: Partner with other development teams on cross-functional projects, working alongside traders and quants to devise the best solutions to real business challenges.Participate in Out-of-Hours Support for our Software Systems.Core Technology Stack:Languages: Python (3.10+), JavaScript/TypeScript for frontend tasks, and Go for select infrastructure.Tools: RabbitMQ and Kafka for messaging, PostgreSQL and Redis for data storage.Environment: Linux servers.Observability: OpenTelemetry, Prometheus, Grafana, and Zabbix.Required Qualifications:Solid experience in software development, particularly with Python.A degree in Computer Science or a related quantitative field from a recognized university.Excellent communication skills, enabling you to explain complex technical concepts to both technical and non-technical audiences.Strong decision-making skills, with an ability to make informed trade-offs in implementation and architectural decisions, balancing innovation with practicality.Experience with web scraping and related technologies is essential.

We are seeking a talented Full Stack Developer to join our dynamic team at Vitol, where you will collaborate closely with various business lines. This role presents a unique opportunity to engage with both technical and non-technical experts to create innovative solutions and full-stack applications that are utilized globally across numerous commercial and operational desks. Your contributions will significantly influence decision-making through the development of cutting-edge solutions.In this role, you will play an integral part in transforming our existing application landscape. Your ability to swiftly comprehend business needs, communicate effectively, work autonomously, and rapidly prototype and iterate on new and existing requirements will be essential in delivering state-of-the-art solutions that empower our commercial teams.As a Full Stack Developer at Vitol, you will exemplify:Rapid Prototyping: Collaborate closely with operations and commercial teams to construct and support market-driven business development applications and enhance existing tools by swiftly iterating based on user feedback to create actionable, value-adding solutions.Project Management: Analyze ongoing business and user requirements while independently managing project lifecycles from start to finish within the team.Innovation: Propose innovative and reliable technical solutions that enhance existing processes or uncover new opportunities for the business.Platform Expertise and Integration: Develop a comprehensive understanding of Vitol's Management Information Systems (MIS) platforms and tools, including their functionalities and capabilities, to ensure their success.

Join Our Team at WintermuteWintermute is a pioneering technology unicorn and a leading player in the algorithmic trading space, focusing on digital assets. We excel in providing liquidity across major cryptocurrency exchanges and trading platforms, deliver comprehensive OTC trading solutions, and actively support renowned blockchain projects as well as traditional financial institutions making their foray into the crypto realm. Additionally, our Wintermute Ventures division invests in promising early-stage DeFi projects.Founded in 2017, Wintermute has adeptly navigated the evolving landscape of the industry. Our culture merges the technology standards of high-frequency trading firms in traditional markets with the innovative spirit and entrepreneurial environment found in tech startups. We are passionate about the transformative power of blockchain and are committed to fostering a compliant and forward-thinking market in the digital asset space. For more insights, click here.Position OverviewWe are in search of a skilled Core Developer to join our dynamic development team. This role offers the opportunity to work within a focused, high-performing group that has a wide-reaching impact across various business sectors. The ideal candidate will be pragmatic, dedicated to producing clean and efficient code, and possess strong interpersonal skills, as collaboration with traders, C++ developers, quantitative researchers, and the DeFi Team is essential. While prior experience in crypto or finance is not a prerequisite, a solid technical foundation and the right mindset are crucial.Our primary services are developed in Python, though we also maintain high-performance infrastructures utilizing C++. We prioritize using the latest versions for both languages. Our systems operate on Linux, utilize PostgreSQL for database management, and incorporate several custom in-house solutions tailored to address challenges common in high-frequency trading.

Role Overview LMAX Group is hiring a C++ Quality Assurance Engineer to join the development team in London. This role focuses on building and maintaining automated testing frameworks, as well as conducting exploratory testing for advanced trading applications. Working closely with developers, the engineer will help ensure that code is designed with testability in mind from the start. What You Will Do Create clear, maintainable automated tests in C++ Spot and escalate risks that could impact delivery, and help put mitigation plans in place Use pair programming to share knowledge and avoid information silos Explore and introduce new testing approaches to improve efficiency Analyze the trading platform and write failing tests to uncover bugs Work with developers to keep testability a priority in new code Essential Skills and Experience Experience writing automated tests in modern C++ on Linux or UNIX Ability to understand business requirements and turn them into effective tests Skill in designing tests that are well-documented, straightforward, and easy to maintain Comfort working independently with minimal supervision No finance or trading background required Desirable Skills Familiarity with the Catch2 testing framework Experience using Continuous Integration tools such as Jenkins Knowledge of Python testing frameworks, especially pytest Background in UI testing Understanding of Websocket and TCP/IP networking Degree in a science or mathematics-related subject Benefits 25 days of annual leave Performance-based bonus Pension contributions Private medical, dental, and vision insurance Life assurance Critical illness protection Wellness contribution program, including ClassPass access Mental health support through the Plumm platform Five volunteer days each year

Job Description:We are seeking an accomplished C# and .NET Developer to join our dynamic team. The ideal candidate will possess a deep understanding of C# and the .NET framework, demonstrating proficiency in developing robust applications and solutions.Mode of Interview: Telephonic & Face to Face.

Join our dynamic team as a Senior C# / Orchestrade Developer at Talan, where your expertise will help shape innovative financial solutions. In this role, you will be at the forefront of developing and enhancing our Orchestrade platform, ensuring high performance and scalability.Your responsibilities will include collaborating closely with cross-functional teams, providing technical leadership, and driving the implementation of best practices in software development. Bring your passion for coding and problem-solving to a vibrant workplace that values creativity and collaboration.

Maven Securities is a cutting-edge proprietary trading firm that strategically allocates its internal capital across diverse trading strategies, including discretionary, systematic, and market-making. Our dedicated team comprises skilled traders, engineers, and technologists, all united in our mission to optimize our role as a leading liquidity provider in the global derivatives market. By utilizing innovative execution and pricing technologies, we aim to transform and enhance the operation of financial markets. As a C++ Developer on our trading floor, you will collaborate closely with traders, quantitative researchers, and fellow developers to enhance system connectivity to new markets, refine order execution algorithms, and advance our trading strategies. You will also be involved in the development of automated pricing systems and infrastructure that bolster our options market-making business. Your contributions will directly influence the firm's success and visibility within the industry.

Join our dynamic team at Talan as an eTrading Python Developer where you will play a crucial role in enhancing our trading systems. You will collaborate with a talented group of engineers and developers to deliver innovative solutions for our clients in the financial sector. Your expertise in Python programming will help us streamline our trading processes and improve system performance.

Position Overview Join our dynamic and collaborative team as a Quantitative Developer specializing in C++. In this role, you will be instrumental in developing and maintaining high-performance trading systems and signal logic while supporting critical infrastructure. You will work closely with quantitative researchers and traders, assisting in the implementation of trading strategies and various research projects. Your collaboration with technology teams will involve providing strategy and signals containers, ensuring seamless integration with Squarepoint's comprehensive infrastructure. The ideal candidate will thrive in a fast-paced environment, adeptly balancing rapid tactical delivery with long-term strategic initiatives. Strong communication skills are essential for driving cross-team projects and daily interactions with quant researchers and traders. A solid work ethic, enthusiasm for cutting-edge technology, and the determination to navigate complex challenges are key attributes for success in this role. Attention to detail and experience with defensive programming are vital. Research and implement trading strategies and signals logic, including backtesting, simulations, and processing frameworks. Develop advanced tooling for analyzing large data sets using statistical methods to identify trading opportunities and assess impacts over time. Gain a thorough understanding of market operations and structures to effectively apply domain knowledge to software design and development. Focus on long-term design improvements and maximizing code reuse. Support quantitative researchers with technical aspects of trading strategies and contribute to R&D efforts. Participate in the strategic design and roadmap for high-performance trading infrastructure. Provide production support, primarily in a Level 2 capacity, with Level 1 support during specific strategy rollouts. Collaborate with cross-functional teams (feed handlers, order gateways, reference data) to drive initiatives including latency monitoring and product rollouts.

G-mass is collaborating with a distinguished global financial institution to find a seasoned Transaction Reporting Change & Release Lead. This individual will be responsible for managing the complete lifecycle of UK/EU transaction reporting changes, from regulatory interpretation to controlled production deployment.This is a hybrid role that combines the responsibilities of a Technical Business Analyst with hands-on SQL and development tasks. You will serve as a vital link between Compliance, Operations, Risk, and Technology, converting regulatory requirements into actionable change specifications, overseeing release delivery, and enhancing production controls. A key goal is to minimize reliance on key personnel by standardizing documentation, runbooks, knowledge transfer, and repeatable release processes.Please note that this role requires presence in the client’s London office (specific days to be confirmed).Key ResponsibilitiesChange, Release & GovernanceManage the full lifecycle of UK/EU transaction reporting changes, including regulatory interpretation, impact assessment, prioritization, build/test coordination, and production deployment.Oversee reporting logic changes across various platforms and upstream systems, leading release planning, prioritization, and timelines in accordance with regulatory and business deadlines.Ensure compliance with formal governance and approval processes (e.g., CAB, go/no-go decisions), with meticulous evidence capture and audit trails.Act as the primary liaison across Compliance, COO, Technology, Operations, Risk, and external ARMs/vendors.Technology & ProcessesCollaborate with developers and architects to gain a comprehensive understanding of transaction reporting infrastructure, data flows, dependencies, and the existing build/test/release processes.Convert regulatory and business requirements into clear, actionable deliverables such as requirements, functional specifications, rules, validation logic, and acceptance criteria.Enhance documentation and knowledge sharing to reduce key person dependency and improve cross-functional understanding of reporting systems and logic.Assist in designing and implementing more robust, scalable, and repeatable release processes for reporting changes.Transaction Reporting Subject Matter Expert (SME)Serve as an SME on UK/EU reporting requirements, including ARMs, reportable fields, and validation rules, translating regulatory texts into practical rules and specifications.Provide insights on regulatory interpretation, including ESMA Q&As and ARM feedback, ensuring alignment of reporting logic with current obligations.Specify technical change requirements across fields, mappings, validations, and exception handling.Testing, Release, Controls & Defect ManagementDefine and execute end-to-end testing and release strategies...

Role OverviewWe are seeking a talented Software Engineer specializing in Python to join our team at cfpenergy. In this pivotal role, you will be instrumental in designing, developing, and scaling our data infrastructure, which is crucial for driving our products and informed decision-making processes. You will help define the flow of data throughout the organization, ensuring it is efficiently ingested, processed, and transformed into actionable insights. Collaborating with developers, analysts, and trading teams, you will ensure our data is not only reliable and accessible but also future-proof. This position seamlessly blends hands-on engineering with architectural insight, allowing you to participate in design discussions, enhance data pipelines, and guide our technical strategy. We are looking for someone who takes initiative, relishes solving intricate problems, and can work collaboratively across various systems and teams to create meaningful impact.Key ResponsibilitiesArchitect, develop, and uphold robust applications within a domain-driven ecosystem.Engage in architectural dialogues and influence the long-term technical strategy.Manage tasks from requirements gathering to completion, showcasing creativity and adhering to coding standards.Create well-structured data models and maintain comprehensive documentation in collaboration with your team’s data engineers.Work closely with data engineers, developers, analysts, and trading teams to gather requirements and deliver dependable, well-architected data solutions.Identify and implement enhancements to performance, automation of manual tasks, and improvements in data quality and reliability across systems.Core Skills & ExperiencesCollaborative mindset: We seek individuals who are not only adept but also enjoyable to collaborate with, promoting a positive team culture through open communication.Analytical thinking: Accuracy and performance are central to our operations; your curiosity, structured approach, and meticulous attention to detail will drive every challenge.Problem-solving skills: You should be comfortable navigating complex systems to diagnose root causes while maintaining composure under pressure, striving for elegant, sustainable solutions.Effective communication: Your ability to articulate complex technical concepts clearly will bridge the gap between technical and non-technical teams, ensuring alignment.

About WintermuteWintermute is a pioneering technology firm and one of the largest algorithmic trading companies specializing in digital assets. We excel at providing liquidity across a multitude of cryptocurrency exchanges and trading platforms, offering a wide array of OTC trading solutions, while also bolstering high-profile blockchain initiatives and traditional financial institutions venturing into the crypto space. Additionally, Wintermute operates a ventures arm that invests in promising early-stage DeFi projects.Since our inception in 2017, Wintermute has adeptly navigated through various industry cycles. Culturally, we blend the technological excellence of high-frequency trading firms in traditional markets with the innovative spirit of technology startups. At Wintermute, we are committed to harnessing the transformative potential of blockchain technology. Our long-term vision focuses on the digital asset market, and we strive to play a leading role in establishing an innovative and compliant trading environment. You can learn more about us here.Join Our Team at WintermuteWe are on the lookout for a passionate C++ Trading Platform Developer who possesses a keen interest in both the intricate details of computer hardware and the overarching design of large-scale systems, including data infrastructure. Ideal candidates will have a natural curiosity to explore the inner workings of systems, a solid understanding of data structures, and experience in writing client-server network applications. Additionally, proficiency in writing and optimizing high-performance code is essential. We value both your commercial experience and personal projects that showcase your dedication to technology. A genuine interest in algorithmic and quantitative trading will be considered advantageous.At Wintermute, you will have the opportunity to grow your skills and make a direct impact on our trading activities by developing and enhancing various components of our trading platform, data infrastructure, and related software. You will receive mentorship and insights from seasoned developers and traders, including the founders of the company. Expect a high degree of independence and responsibility from the outset, with a learning curve that is second to none. We do not have legacy systems, excessive approvals, or bureaucracy; all developers report directly to the CTO, who is actively involved in day-to-day operations. Your contributions will be evaluated based on their impact rather than the hours you log.

Join our dynamic team at asos as a Senior Software Engineer specializing in Azure and C#. In this pivotal role, you'll be responsible for designing, developing, and deploying innovative software solutions that enhance our e-commerce platform. You'll collaborate with cross-functional teams to ensure the delivery of high-quality software that meets our business objectives and customer needs.

Application Notice: Please apply only to the position that aligns most closely with your skills and experience. If our team believes you are better suited for a different role, we will contact you regarding that opportunity.Position Overview:At Squarepoint Capital, we leverage Python to develop essential software that addresses pivotal challenges daily. You will engage with a diverse array of systems that drive our trading success, including core tools and frameworks, data pipelines that support predictive models in research and trading, and software products utilized globally by traders and researchers.Your collaboration with seasoned software developers and quantitative researchers will contribute to the ongoing expansion of our investment business, tackling problems at scale, while also providing a unique opportunity to learn from some of the industry's most talented professionals.

About AboundAt abound, we are revolutionizing the landscape of consumer lending across the UK and beyond. By leveraging cutting-edge AI and Open Banking data, we strive to make fair and affordable personal finance accessible to a wider audience. Unlike traditional lenders who heavily depend on credit scores, we analyze the complete financial picture of our customers—considering their spending patterns and repayment capabilities—to build a nuanced understanding of their unique financial situations.Our approach has proven successful at scale. We have facilitated over £1.3 billion in loans directly to customers while achieving exceptional credit performance—for every 10 defaults anticipated by the industry, we experience only 3. Remarkably, we reached profitability just 2.5 years post-launch.With backing from over £2 billion from prestigious investors including Citi, GSR Ventures, and Deutsche Bank, we are recognized as one of Europe’s fastest-growing fintech companies (Sifted, CNBC). As we expand into new markets and product lines, we are on the lookout for driven individuals eager to learn, take ownership, and grow alongside us.We are seeking a talented Senior Python Engineer to join our engineering team. In this role, you will collaborate closely with our Finance team to design and implement automation solutions that enhance our core financial operations. You will be responsible for translating business needs into robust, maintainable systems that increase accuracy and efficiency across critical workflows.This position requires a candidate who blends strong technical acumen with a desire to understand the business intricacies. You will be empowered to independently scope and execute changes, manage stakeholder expectations, and ensure every enhancement is durable. Your contributions will play a vital role in maintaining the smooth and scalable operation of our financial processes.We value engineers who take initiative, enjoy tackling complex challenges, and excel at clarifying ambiguous requirements. You will thrive in our environment if you are motivated by creating systems that deliver tangible business impact, can articulate technical concepts to non-technical partners, and take pride in producing high-quality, well-designed code.At abound, you will immerse yourself in a culture that champions autonomy, curiosity, and continuous improvement. You will engage with a modern Python-based tech stack, gain in-depth insights into how financial operations function in a rapidly growing lending business, and have the opportunity to enact significant technical changes in collaboration with experienced stakeholders.