Quantitative Developer - High Performance Computing (Python)

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 …

Exciting News! We're thrilled to announce that we've successfully raised $60 million in our Series B funding round, achieving a valuation of $685 million. Learn more about this significant milestone here. At Lawhive, our mission is clear: to democratize access to legal services for everyone. The legal landscape is often hindered by outdated technologies and practices, which is why we've fundamentally reimagined the model, leveraging our proprietary AI operating system as the foundation.As a regulated law firm, Lawhive integrates cutting-edge AI technology to enhance legal expertise and revolutionize the practice of law, delivering outstanding outcomes for both clients and legal professionals.Our innovation hub, Lawhive Labs, embodies this vision. Here, we unite elite engineers, designers, AI specialists, and legal experts from across the globe to shape the future of law.With the backing of prestigious investors like Google Ventures, Balderton Capital, and TQ Ventures, we are poised for international expansion following our recent funding success. Having launched in the US in 2025, we are only at the beginning of our journey.Engineering at LawhiveOur engineering team of 40 talented individuals is dedicated to architecting, developing, and maintaining Lawhive's platform, which is trusted by numerous legal professionals daily across the UK, US, and beyond.In the coming year, we are committed to addressing numerous challenges, particularly:Enhancing the user experience for AI interactions within legal practice, moving beyond conventional chat interfaces to pioneering new methods of human-machine engagement.Integrating modularity and international adaptability into our platform as we build the world’s first global consumer law firm.Our approach to legal services is holistic; we are not just developing software, we are an AI-driven law firm.

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.

About LendableLendable is committed to revolutionizing the way individuals access credit and save money. As one of the UK's most dynamic fintech firms, we are proud to have achieved significant milestones:Recognized as one of the UK’s newest unicorns, with a growing team of over 700 professionals.Ranked among the fastest-growing technology companies in the UK.Profitable since 2017.Supported by leading investors such as Balderton Capital and Goldman Sachs.Highly rated by customers, boasting a 4.9 rating on Trustpilot based on thousands of reviews.We have successfully reimagined the Big Three consumer finance products: loans, credit cards, and car finance, enabling us to deliver funds to our customers in minutes rather than days.As we continue to expand, our ambitions are set on capturing the two largest Western markets—the UK and the US—where vast financial resources remain tied up in outdated systems and cumbersome processes.Why Join Us?Empower Yourself: Enjoy the autonomy to make impactful decisions that shape the success of Lendable from day one.Collaborate with Talent: Work within intimate teams of exceptional individuals who are adept at problem-solving and innovative thinking.Innovate In-House: Develop cutting-edge technology using advanced data sources, machine learning, and AI to streamline operations.About the RoleWe are seeking a skilled Mid-Level PHP Engineer to enhance our UK Loans team.Our engineering division consists of over 160 dedicated engineers across various disciplines, including backend, frontend, mobile, and platform.In this role, you will engage in diverse activities, from creating and integrating new APIs to improve the customer experience, to optimizing our lending platforms and participating in in-depth architectural discussions. There are numerous challenges ahead, and we are eager to find the right talent to join us.

Join Reddit as a Senior Client Account Executive for the Mid-Market segment in the UK and play a pivotal role in driving our growth. You will be responsible for developing and nurturing relationships with clients, understanding their needs, and leveraging Reddit's advertising solutions to deliver exceptional results. This is a fantastic opportunity to work with a dynamic team in a fast-paced environment, where your contributions will make a significant impact.

Location: Hybrid in central London (3 days onsite per week) Contract Type: Contract Role overview minderacraft seeks a Senior Python Engineer to support the scaling and enhancement of the AI Stylist, a live AI-powered recommendation system for web and mobile users. As the product enters a rapid growth phase, the team faces a substantial backlog of features and improvements. This contract role sits within the Recommendations team, focusing on integrating advanced AI capabilities and blending conversational interfaces with recommendation logic. The work directly affects the quality, relevance, and reliability of a customer-facing system in production. What you will do Develop and refine AI-driven services using Python Design and implement evaluation frameworks for large language model (LLM) systems Enhance output quality through structured evaluations, beyond just code changes Apply techniques such as LLM-as-a-Judge to assess recommendations and responses Manage and iterate on non-deterministic systems, using real-world performance data Integrate AI features into a broader platform and API ecosystem Contribute to production readiness, focusing on reliability, observability, and performance metrics Collaborate closely with data scientists on prompt engineering, model selection, and evaluation strategies Requirements Core experience Strong Python engineering background in production environments Experience building AI-enabled applications, especially recommendation or conversational systems Direct experience with evaluation frameworks for LLM or AI systems Understanding of how AI systems differ from traditional deterministic software Ability to design effective evaluations and drive ongoing system improvement Track record of collaborating in cross-functional teams with engineering, data, and product stakeholders Nice to have Familiarity with Azure AI services or similar platforms Knowledge of OpenAI or comparable SDKs Exposure to infrastructure and distributed systems Experience with tools like Terraform or Kafka Benefits Competitive day rate

Python Developer - Data & Analytics Team - Options Market Making Maven is a leading proprietary trading firm dedicated to optimizing internal capital across discretionary, systematic, and market-making strategies. Our team comprises experienced traders, engineers, and technologists, all committed to advancing our role as a top liquidity provider in the global derivatives market. Our engineering teams are at the forefront of developing innovative execution, pricing, and data systems that revolutionize the functionality of financial markets. As a Python Developer, you will collaborate closely with traders, quantitative researchers, and fellow developers to create reliable, timely, and accurate data and analytics solutions for our trading and research teams. Our data pipelines process terabytes of exchange traffic, executing numerous real-time transformations. We conduct analyses that range from nanosecond-level investigations on low-latency trading systems to research on pricing algorithms and trading strategies.

About UsIn just 18 months, Heidi has revolutionized healthcare by providing over 18 million hours back to clinicians. We support 73 million patient visits across 116 countries in more than 110 languages. Currently, we empower more than two million visits each week globally, striving to build the most advanced AI Care Partner that assists clinicians before, during, and after every patient visit.Founded by a diverse team of clinicians, engineers, designers, and scientists, we share a unified mission: to enhance the human connection that lies at the core of healthcare.With hundreds of thousands of clinicians already utilizing Heidi with great satisfaction, we are now focusing on scaling our impact to the next level.Why This Role MattersWith the activation of Product-Led Growth (PLG), we witnessed an overwhelming response from clinicians. Our next challenge is to convert this enthusiasm into widespread organizational adoption.This role extends beyond just Ambient Voice Technology (AVT):Heidi Scribe - our foundational toolHeidi Comms - enhancing patient interactions and workflowsHeidi Evidence - providing trusted clinical decision supportHeidi Remote - innovative hardware eliminating the need for a phoneFuture Initiatives: Developing agentic workflows that automate significant aspects of care deliveryYour ResponsibilitiesAs the Senior Sales Manager, you will lead our Mid-Market & SMB sector across the UK & Ireland, overseeing:Primary Care SMB (Account Executives + Sales Development Representatives)Private Market Mid-Market & SMB (Account Executives, Sales Development Representatives, Business Development Representatives)This position is primarily a new business role, emphasizing the strategy of land → expand → scale.Your leadership will extend beyond managing a team; you will be responsible for developing the infrastructure that the team operates on, including sales playbooks, organizational structure, and performance standards.

Job Title: Python Developer – Front Office R&D Trading SystemsLocation: London, UKEmployment Type: Permanent or ContractAbout MARGOMARGO is a cutting-edge consultancy providing invaluable IT expertise to the financial services sector. We excel in complex Front Office environments where software engineering, quantitative analysis, and production stability converge. Our specialists collaborate closely with trading and research teams to enhance real-time trading platforms, pricing models, and analytical systems.The RoleAs a key member of our Front Office R&D and Trading Technology team, you will be responsible for designing, maintaining, and evolving the ecosystem utilized by traders and quantitative analysts. This role involves 70% Development & Engineering and 30% Production Support, allowing you significant ownership over the platform.The environment is dynamic and characterized by rapid iterations, direct trader interaction, and stringent reliability standards. You will primarily work with Python to develop essential frameworks, analytical libraries, and monitoring tools.Key ResponsibilitiesDevelopment & Engineering (Approx. 70%)- Design, develop, and maintain core libraries and frameworks in Python.- Collaborate with traders and research teams to gather requirements for new analytical and trading tools.- Enhance the performance, scalability, and maintainability of the Python platform.- Upgrade existing monitoring, analysis, and control tools to support research workflows.Support & Production (Approx. 30%)- Provide L1/L2 support to Front Office users to ensure system stability during market hours.- Investigate and resolve production incidents promptly.- Develop tools to enhance system reliability and operational efficiency.- Contribute to the evolution of performance-sensitive, low-latency setups.RequirementsEssential Skills:Strong Python Proficiency: Deep expertise in core Python development and performance-oriented coding.Linux/UNIX: Robust knowledge of Linux environments for production and debugging.Database Skills: Proficiency with SQL and relational databases.Production Experience: Capacity to perform under pressure and strong troubleshooting and analytical abilities.Communication: Clear communication with a structured approach to problem-solving.Valued (but not mandatory):Experience in Front Office R&D or Electronic Trading environments.

JetBrains is seeking an AI Lead focused on Python tools. This position centers on advancing AI technologies across the company’s product suite, with the goal of improving both user experience and product capabilities. Role overview The AI Lead will guide the development and integration of AI features into JetBrains products. The role involves direct oversight of AI project initiatives and regular collaboration with teams from various disciplines. Expect to play a key part in shaping technical direction and ensuring that Python-powered solutions continue to set a high standard in the industry. What you will do Oversee AI-focused projects from conception through implementation Work closely with engineers, designers, and product managers to align AI features with product goals Drive innovation by applying Python expertise to create and refine AI solutions Locations This role is open to candidates based in Amsterdam, Belgrade, Berlin, Limassol, London, Madrid, Munich, Paphos, Prague, remote within Germany, Warsaw, and Yerevan.

Join Ratio Recruitment Ltd as a Mid-Level UX Developer where your creativity and technical skills will play a crucial role in shaping user experiences. You will collaborate closely with cross-functional teams to design interactive and user-friendly applications that delight users. This position offers an opportunity to work in a dynamic environment while contributing to exciting projects.

Salary: £55k to £65KMethods is seeking a skilled Back-end Developer with expertise in Java Spring Boot and Python to enhance our team within the private sector business unit on a permanent basis.This hybrid role requires three days a week on-site in our London office, offering an excellent work-life balance.Key Responsibilities:Architectural Rebuild: Take a pivotal role in migrating and reconstructing our core architecture using Java Spring Boot to align with a composable, cloud-native environment.Connector Development: Design and fine-tune technical connectors for a wide range of global channels, including generalist marketplaces, social commerce platforms (e.g., TikTok Shop), and quick-commerce services (e.g., Glovo, Deliveroo).Catalog Publication Flow: Lead efforts in rebuilding the catalog publication flow, resolving technical challenges such as category mapping, product variant synchronization, and asynchronous marketplace APIs.Business Logic Migration: Work collaboratively to transition complex legacy business rules (including pricing calculations, stock filtering, and fulfillment decisions) into dedicated BCP assets, ensuring OMC focuses solely on orchestration and connectivity.System Reliability: Guarantee 100% accurate real-time synchronization of stock and price updates to prevent financial discrepancies, thereby enhancing the customer experience.

Role overview Wise is looking for a Senior Data Platform Engineer I to help shape and improve the database platform. This position focuses on building and supporting data infrastructure, with Python as a core tool. The engineer will help ensure the platform is reliable and ready for new solutions.

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.

Our MissionBe part of a revolution in paid search intelligence.At Adthena, we are an award-winning search intelligence platform that leverages patented AI technology and a skilled team to empower brands, marketers, and agencies to excel in their competitive environments. Our innovative solutions, including Whole Market View, Smart Monitor, and Local View, provide clients with critical insights to optimize their spending, boost ROI, and maintain a competitive edge.With a trusted client roster that includes global brands like Citibank, L’Oréal, and Volvo, and supported by Updata Partners, we have been at the forefront of search intelligence since our inception in 2012.In 2025, Adthena achieved remarkable recognition, winning 8 prestigious search industry awards, including Best AI Search Software Solution at the US Search Awards, Best Search Software Tool at the European Search Awards, and Best Software Innovation at the Global Search Awards.Are you ready to make a difference in an industry-leading company? Join us on this journey!Why Join Us?We offer the perfect blend of stability and innovation, combining the reliability of a well-established company with the dynamic environment of a rapidly growing tech organization.If you have been wary of typical tech companies due to concerns about disorganization, instability, or unpredictability, Adthena is your solution.Experience a smaller company environment that fosters autonomy, minimizes bureaucracy, and accelerates your growth.Here’s what we offer:A Thriving Engineering CulturePositive Work Environment: Our quarterly surveys reveal a 93% average approval rating for our company culture, with an overall eNPS of 27.Award-Winning Solutions: Recognized as the Best AI Search Software Innovation at the US 2025 Search Awards.Equity Opportunities: Our employees make significant contributions, and as we grow, they share in the success.Flexible Time Off: Enjoy a trust-based vacation policy allowing you to take time off as needed.Remote-First Approach: 52% of our team works fully remotely, with others opting for hybrid roles at our three geographical hubs (London, Austin, Sydney).Flexible Work Arrangements: Work in a way that suits you best, with full autonomy over your daily schedule.

Join Our Innovative Team at FreetradeAt Freetrade, we're on a mission to simplify investing, making it accessible and affordable for everyone. Our goal is to empower individuals to maximize their savings and grow their wealth.We're building an exceptional team of innovators who are passionate about transforming the investment landscape. If you're someone who thrives on tackling challenging problems and crafting cutting-edge products, you will find your place here.The upcoming year, 2026, promises exciting developments for us. Following our partnership with IG Group, we will continue to operate independently while benefiting from their extensive resources and expertise.This year, we aim to elevate our offerings by introducing new features such as mutual funds, bonds, and family investment tools. We're also exploring the integration of AI to enhance our customer experience further.Why You Should Join Our Engineering Team?Become a crucial part of a team that is redefining the investment future. As a Software Engineer, you will be instrumental in creating and maintaining a robust and scalable platform that serves thousands of users daily. We embrace complex technical challenges, foster innovation, and develop solutions that make a tangible difference. Here, your contributions will influence investment decisions throughout the UK. Join us to transform ideas into reality.We are on the lookout for a talented Mid-Level Software Engineer to join our Backend Engineering team.Our Primary Tech Stack:NodeJS/TypescriptGoogle Cloud PlatformPostgreSQLKey Responsibilities:Deliver high-quality software solutions within set timelines, tackling complex problems by proposing multiple solutions and evaluating trade-offs to assist your team in making sound technical decisions.Address technical challenges by providing scalable and maintainable solutions efficiently, considering trade-offs.Understand the core features and KPIs of your product, collaborating closely with the Product Manager to drive product development.Be prepared for on-call responsibilities, effectively responding to high-priority issues and knowing when to escalate them.About You:You have a solid background in software engineering, with experience in the technologies we use.

Join Our Team as a Full Stack Java/Python Engineer!We are seeking a talented Full Stack Java/Python Engineer for an exciting 6-month contract starting as soon as possible.Work Schedule: 2 days a week in our London office.Key Responsibilities:Leverage your extensive commercial software development experience, demonstrating a strong command of Java and Spring Boot, while crafting robust end-to-end full stack applications encompassing frontend, backend, and APIs.Utilize your proficiency in Python for agent services, orchestration, and LLM integrations.Implement modern frontend frameworks, such as React or Typescript, to deliver high-quality user experiences.Engage with cloud technologies and containerization (AWS/GCP/Azure, Docker), with a preference for candidates with Kubernetes experience.Handle data and retrieval mechanisms, including Postgres/NoSQL, vector databases, embeddings, and semantic search.Collaborate effectively in an agile development environment.Communicate technical challenges and influence decisions within the team, ensuring stakeholder satisfaction.Exhibit a strong understanding of engineering best practices, such as TDD, SOLID principles, and XP methodologies.Our Commitment to Diversity:We are proud to be an equal opportunity employer and encourage applications from all qualified candidates. We actively promote inclusivity and welcome applications from women, ethnic minorities, and individuals with disabilities. We consider all flexible working arrangements, tailored to the needs of the role, and strive to accommodate reasonable adjustments.

We are looking for a Senior Staff Python Software Engineer to join our dynamic team at abound. In this role, you'll leverage your expertise in Python to design, develop, and maintain high-quality software solutions that meet our clients' needs. You'll work closely with cross-functional teams to deliver innovative products that drive our mission forward.

This position can be based out of either our Amsterdam or London office.At Stacks, we prioritize in-office collaboration, believing that great products emerge from teamwork.About StacksAt Stacks, we are revolutionizing the financial close process for mid to large enterprises, turning a traditionally tedious task into an efficient and strategic initiative. Our mission is to simplify the monthly close through innovative AI technology, enabling finance teams to gain accurate insights immediately at the start of each month. By reclaiming valuable time, we empower these teams to concentrate on high-impact strategic work that propels their companies forward.Our dynamic team comprises finance, product, and tech experts from renowned companies like Uber, Plaid, Miro, Mollie, and Bunq, all motivated by the shared goal of delivering a transformative solution. Nestled in the heart of Amsterdam, our office boasts inspiring views of the iconic canals. With backing from leading VCs and industry pioneers from Stripe, Plaid, and OpenAI, we are poised to redefine the landscape of finance.About the RoleWe are searching for a highly driven and entrepreneurial Mid-Market Account Executive to join our London team.In this impactful position, you will play a key role in shaping and executing our go-to-market strategy. If you thrive in fast-paced environments and are eager for limitless growth, this is a unique chance to advance your career while contributing to Stacks' future. ResponsibilitiesRevenue Generation: Manage the entire sales cycle from outbound prospecting to closing deals. Engage regularly with Controllers, VPs of Finance, and CFOs to advocate for Stacks as the leading solution in modern close management.Consultative Selling: Identify each prospect’s financial close challenges and align them with Stacks through customized, value-oriented discussions.Engagement with Financial Decision-Makers: Target senior finance leaders, skillfully navigating complex organizational structures and purchasing processes in the upper Mid-Market and Enterprise sectors.Collaborative Strategy Development: Work closely with internal teams to refine sales processes, improve customer engagement, and enhance overall performance.

Join our innovative team at Upbeat Ideas UK Ltd as a Senior Ruby Developer. We are looking for an experienced developer who is passionate about building high-quality applications using Ruby on Rails. You will play a crucial role in designing, developing, and maintaining scalable web applications that enhance user experience and drive business success.The ideal candidate will have a strong background in software development, a knack for problem-solving, and the ability to work collaboratively in a dynamic environment.