Senior Back-End Software Engineer at Marcura | London

Position Overview:We are in search of a skilled and enthusiastic Software Developer to become an integral part of our expanding team. In this pivotal role, you will be instrumental in the design, development, and maintenance of Squarepoint's internal frameworks, services, and platforms that drive our business operations. This is a fantastic opportunity to work with advanced technologies, directly influencing the efficiency and productivity of both our investment and technology teams at Squarepoint.Design, develop, and maintain high-quality, scalable, and high-performance software solutions.Contribute to the creation of company-wide productivity tools, frameworks, and platforms that enhance operations across the organization.Collaborate with fellow developers and stakeholders to collect requirements, design solutions, and implement features.Write clean, well-documented, and testable Python code.Engage in code reviews and help elevate code quality and development practices.Diagnose and resolve technical issues promptly and effectively.Stay informed about the latest advancements in Python technologies and industry best practices.

Position Overview: Join our dynamic team at Squarepoint Capital as a Software Developer specializing in Internal Compute Frameworks using Rust. In this pivotal role, you will design, build, and maintain essential internal frameworks, services, and platforms that drive our business operations. Your contributions will directly enhance the efficiency and productivity of our investment and technology teams, allowing you to work with cutting-edge technologies and make a significant impact. Key Responsibilities: Design, develop, and maintain scalable, production-grade distributed systems. Collaborate with investment stakeholders and technology teams to ensure alignment on project goals. Take full ownership of the systems developed, ensuring their reliability and performance. Provide effective support and troubleshooting for live production systems. Engage in all phases of the software development lifecycle, from gathering requirements to production support. Work comfortably with a diverse technology stack, including Rust, Python, Kubernetes, and more.

Join Squarepoint Capital as a Quantitative Developer specializing in High Performance Computing with expertise in Python. In this pivotal role, you will contribute to the development and optimization of advanced quantitative models, leveraging your technical skills to enhance performance in a fast-paced environment. Your work will directly influence trading strategies and investment decisions, making a significant impact on the firm's success.

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.

Position Overview: Join our dynamic Alpha Data team as a Software Developer specializing in Python. You will play a pivotal role in delivering extensive data solutions to our global clientele. As a key member of our expanding Data team, you will develop deep technical expertise and foster collaborative relationships with quantitative researchers, traders, and peers throughout our Technology division. The Alpha Data teams at Squarepoint are adept at rapidly deploying invaluable data across the organization. Our ingestion pipelines and data transformation processes are designed for resilience and maintainability, with data models crafted in close partnership with researchers to facilitate efficient query construction and alpha generation. We promote scalability by building innovative frameworks, libraries, and services that enhance team productivity, quality of work, and code integrity. We prioritize teamwork and collaboration, reward excellence, and value diverse perspectives and creative solutions. Our culture emphasizes continuous learning, development, and growth. Take shared ownership of our expanding array of data pipelines. Contribute innovative ideas for new abstractions and enhancements, making a significant positive impact on our global team. Design, implement, test, optimize, and troubleshoot our data pipelines, frameworks, and services. Collaborate with researchers to integrate new datasets. Lead production support operations during regular business hours.

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 LMAX seeks a C++ and Python Developer to join its Middle-Office Team in London. This group works alongside infrastructure, research, and treasury teams to advance trade reconciliation, back-testing frameworks, and trading monitoring systems. The main focus lies in data engineering and building trading systems from the ground up. Prior experience in finance or trading is not required for this position. Team approach The team operates at the intersection of C++ and Python. C++ powers the infrastructure, while Python supports research tasks like analysis and automation. Bridging these languages is central to the role, supporting integration and collaboration across disciplines. Performance and optimization Managing financial data introduces technical challenges, particularly around throughput. The team values software performance but never at the expense of maintainability. Developers work closely with the codebase to understand, optimize, and refine systems. Testing practices Comprehensive testing is a core part of the workflow. The team maintains test suites that include unit tests and full end-to-end simulations. Continuous integration runs these tests every 15 minutes, ensuring rapid feedback and no overnight waits for results. What you will do Write clear, well-structured, and thoroughly tested code in C++ and Python Develop software solutions that handle high throughput Pair program to share knowledge and prevent silos Design and implement features to enhance safety, performance, and usability Create interface code connecting C++ and Python using pybind Requirements Strong C++ skills, especially with modern C++ on Linux or UNIX Python development experience, including Numpy, Pandas, and SQL Experience with automated testing for both C++ and Python Ability to interpret business requirements and build effective systems Skilled at designing simple, well-documented, and maintainable solutions Comfortable working independently with minimal supervision No finance or trading background needed Bonus skills Experience with test-driven development and testing across multiple system levels Location This position is based in London, England, United Kingdom.

Internship Overview Wexler is seeking a Software Engineering Intern to join its London team. This is a hands-on role where interns work closely with experienced Software and Machine Learning Engineers, contributing directly to the company’s agent infrastructure and product innovation. The work impacts legal professionals who depend on Wexler’s technology every day. This internship is designed for students set to graduate in 2026 or strong second-year students from top UK universities, ideally studying Computer Science or a related field. A genuine interest in building, learning, and applied AI is important. About Wexler Wexler specializes in Legal AI, focusing on solutions tailored to the specific workflows of legal professionals. The company addresses the slow adoption of AI in the legal sector by offering targeted, precise tools rather than general-purpose platforms. Wexler’s approach has earned positive feedback for its attention to detail and commitment to supporting the needs of legal practitioners. What You Will Do Develop and improve Wexler’s agentic infrastructure. Work with the technical team on new projects that extend product capabilities. Help build user interfaces that make complex legal workflows accessible. Collaborate with AI engineers to bring LLM features into production systems. Participate in architecture discussions and learn best practices from experienced engineers. Tackle challenges such as delivering smooth user experiences, scaling performance, and upholding enterprise security standards. Technical Skills Back-end: Solid experience with Node.js, TypeScript, or Python (preferably both). Ability to write clean, testable server-side code. Databases: Familiarity with relational databases, especially PostgreSQL. Understanding of schema design and querying.

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 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.

At Fastly, we are dedicated to enhancing connectivity to the digital experiences that matter most to our users. Our cutting-edge edge cloud platform empowers our clients to rapidly and securely deliver exceptional digital solutions by processing, serving, and securing applications close to their end-users — right at the edge of the Internet. Built to leverage the modern internet, our platform is highly programmable and supports agile software development, serving a roster of prestigious clients such as GitHub, Yelp, Paramount, and JetBlue.Join us in our mission to create a more trustworthy Internet.Posting Open Date: 24 March, 2026Anticipated Posting Close Date*: 20 April, 2026*Job posting may close early due to the volume of applicants.Staff Software Engineer, Compute PlatformOur team is responsible for developing the Compute platform at Fastly — an advanced serverless solution built on open standards operating on our extensive global edge network. This platform meets the demands of modern application development, enabling customers to execute code in a secure environment with microsecond cold start times, at scale, right on the edge.We are seeking a talented Staff Software Engineer to join our dynamic team and help enhance our hosting infrastructure. This role will encompass essential networking and systems-level tasks, as well as cross-team collaboration and the design of high-quality APIs for our customers to leverage services developed by other teams. You will also have the opportunity to contribute to influential open-source projects (such as Wasmtime) that play a pivotal role in our Compute vision.What You'll Do:Facilitate seamless communication and coordination among team members and across various technical and product teams.Engage in code reviews to enhance the codebase and improve team processes.Lead projects from a technical standpoint, driving progress and keeping stakeholders informed on project status.Develop platform-level code in Rust that addresses host concerns such as back pressure, resource limits, and service interactions.Investigate and resolve performance and stability challenges to meet stringent scalability requirements.Take ownership of a large-scale production system characterized by exceptional performance and availability needs.

Position Overview: The Quantitative Development team collaborates closely with quantitative researchers to architect, implement, deploy, and utilize cutting-edge software for research and trading purposes. As an integral part of the technology team, we embrace modern software development methodologies and work alongside peers to innovate and enhance these tools for broader applications. Quantitative developers lead cross-functional initiatives with both technologists and quantitative researchers across diverse asset classes to fulfill Squarepoint’s strategic objectives. Engage with quantitative researchers to design and construct robust and scalable workflows for research and trading. Work collaboratively with team members and technical peers to ensure global consistency and maximize the reuse of software components. Take full ownership of projects throughout their complete engineering lifecycle. Provide level 2 support for mission-critical components.

Join Hudson River Trading (HRT), a leading global algorithmic trading firm, where innovation meets high-performance computing. Our research cluster is the cornerstone of our trading success, providing the robust environment where cutting-edge trading strategies are conceived and executed. At HRT, we leverage a state-of-the-art research ecosystem featuring advanced CPU and GPU computing, expansive storage solutions, and high-speed networking technologies. Our engineering team meticulously handles the software stack, optimizing everything from user-level APIs to low-level caching mechanisms. We tackle a diverse range of challenges—from theoretical resource scheduling to the practical optimization of trading program runtime performance. As a Distributed Compute Engineer, you will play a vital role in shaping the user experience for our research environment, developing and refining technical solutions that enhance research efficiency and accessibility. Collaborating daily with our talented quantitative traders and software engineers, you'll contribute to a dynamic environment that fosters innovation and excellence.

Join Isomorphic Labs, where we are harnessing cutting-edge AI to drive revolutionary scientific discoveries, accelerate breakthroughs, and develop transformative medicines, with the ultimate goal of tackling all diseases.We envision a future powered by the remarkable capabilities of machine learning—one where drug discovery is not only improved but revolutionized.Be a vital part of our dynamic interdisciplinary team, dedicated to pioneering innovations and playing a significant role in our ambitious mission, all while thriving within a culture that inspires collaboration and creativity.The future we aspire to is being shaped today, starting with our company culture and each one of us.About Isomorphic LabsFounded in 2021, Isomorphic Labs is committed to enhancing human health through advanced AI technologies, building on the Nobel-winning AlphaFold system. Our diverse team of drug discovery professionals and machine learning experts has developed powerful predictive and generative AI models that expedite scientific discovery at an unprecedented pace.Our name embodies our belief in the intrinsic symmetry between biology and information science. By leveraging AI’s robust capabilities, we model intricate biological phenomena to design innovative molecules, predict drug performance, and create groundbreaking treatments for some of the world’s most pressing health challenges.We have established a leading drug design engine featuring AI models adept at working across various therapeutic areas and drug modalities. Our commitment to continuous innovation in model architecture and the development of advanced capabilities propels the future of rational drug design.With each breakthrough, we are inching closer to the realization of digital biology and our ambitious mission to ultimately conquer all diseases with the power of AI.

Join Vortexa, a dynamic and rapidly expanding technology firm, dedicated to bridging the significant information gap in the energy sector. Leveraging extensive satellite data combined with cutting-edge artificial intelligence, we provide a revolutionary perspective on global seaborne energy movements in real-time. Our mission is to enhance transparency and efficiency within energy markets, ultimately benefiting society at large.The Data Platform Team at Vortexa oversees all aspects of our data, spanning from raw satellite AIS/imaging data to unstructured textual and graphical maritime data, including fixtures, port lineups, and customs filings. We also manage highly structured datasets, such as price and supply-demand forecasts, alongside modeling global energy flows and tanker fleet distributions.Our team has developed a diverse array of procedural, statistical, and machine learning models that enable us to deliver the most accurate and comprehensive insights into energy flows. We take pride in applying advanced research to real-world challenges in a sustainable, robust, and maintainable manner, with our data quality rigorously evaluated by seasoned market and data analysts.As a Software Engineer, you will play a vital role in designing and developing the infrastructure and applications necessary for the design, deployment, and benchmarking of both existing and new pipelines and machine learning models. Collaborating with software engineers, data scientists, and market analysts, you will ensure the reliability and fault tolerance of every component in the team’s data pipelines, ensuring our systems maintain 100% uptime.

About the Role:Join our client, a premier provider of online Brand Protection solutions, safeguarding the intellectual property of over 600 brands across the globe.As a vital part of our team, you will be instrumental in the design and development of systems dedicated to monitoring and enforcing against counterfeit brand-name products and digital content. Your expertise will be leveraged to enhance both the user interface and back-end functionalities, aligned with our product roadmap.Responsibilities:Engage in the complete Agile software development lifecycle.Architect and develop innovative features.Continuously refine and improve the existing codebase.Diagnose and resolve application functionality issues while providing support and troubleshooting for both the development team and clients.Your Profile:A genuine passion for technology and working on cutting-edge software.Self-driven with strong prioritization skills, able to meet deadlines and manage evolving priorities independently and collaboratively.Enthusiastic and committed to delivering high-quality work.Collaborative mindset with a willingness to find common ground and solutions.Results-driven and thrives in fast-paced environments, maintaining composure and sound judgment under pressure.Exceptional interpersonal and communication skills.

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.

At Suade, we are pioneering cutting-edge regulatory technology designed to avert future financial crises. Our success hinges on the collaborative efforts of our engineers and domain experts, who work together to transform complex financial and regulatory concepts into robust code. As a RegTech Engineer, you will play a vital role in driving the continuous growth of our business.This position is ideal for seasoned software engineers who have a passion for structuring and solving real-world challenges through technology. If you possess an eagerness to learn about finance, a strong analytical mindset, and enjoy collaborating with non-technical teams to convert their insights into functional code, we would love to connect with you.Please note that we cannot provide visa sponsorship for this role. Applications from candidates requiring visa sponsorship will not be considered.Suade is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without bias.

Skin + Me is a pioneering technology start-up dedicated to transforming personalized skincare solutions. We have successfully delivered millions of treatments through our diverse multi-brand ecosystem, which includes Skin + Me, Hair + Me, and Renew + Me. Our proprietary technology stack supports everything from our e-commerce platform to in-house manufacturing processes.As we enter an exciting new growth phase, we are seeking a Senior Full Stack Software Engineer to join our dynamic and high-impact team. We leverage cutting-edge tools like Claude Code and Cursor to enhance our modern, fast-paced workflows.Our MissionAt Skin + Me, we prioritize tangible results over mere hours logged. Your objective will be to utilize advanced tools to streamline mundane tasks, allowing you to focus on tackling complex challenges related to scalability, experimentation, and architecture.Your ResponsibilitiesAgentic Workflows: Employ agentic tools to plan, refactor, and deploy features throughout our Python/React stack, significantly enhancing your technical capabilities.Full-Stack Ownership: Architect and implement comprehensive features, managing everything from backend logic and database designs to contemporary frontend user experiences.Drive Engineering Advancement: Contribute to shaping our AI-native development standards and guide the team towards high-velocity delivery practices.Who You AreAI Proficiency: You are adept in utilizing agentic AI, capable of managing edits across multiple files and discerning any inaccuracies from language model outputs.Pragmatic Architect: With your senior experience, you know when to rely on automated tools and when to intervene personally. You appreciate clean code, robust type systems, and comprehensive testing.High Agency: You are a proactive problem-solver who flourishes in a fast-paced, self-directed environment.Technical Skills RequiredExpertise in Python and associated web development frameworks, such as Flask and Django.Experience with relational databases (MySQL preferred) and ORM frameworks (e.g., SQLAlchemy, Alembic).Proficient in TypeScript and React.Experience in building and maintaining frontend design systems.Familiarity with containerization (Docker) and cloud platforms (preferably AWS).Understanding of modern web architecture and performance optimization techniques.Why Join Skin + Me?High Leverage: We equip you with the best tools and the freedom to utilize them effectively.Make a Difference: Be part of a revolutionary company dedicated to enhancing millions of lives.Equity: Every team member has a stake in our success.Perks: Enjoy free breakfast and lunch on office days, a dog-friendly workplace, 25 days of holiday, and an annual £500 development budget.