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Key Responsibilities:Analyze data to identify fraud trends and develop an in-depth understanding of fraudulent behaviors using SQL, Google BigQuery, and Google Looker. Formulate and implement detection rules to minimize fraudulent activities on our platform. Conduct investigations on escalated cases of potential misuse of our platform and assist with legal and customer inquiries. Collaborate with data science and engineering teams to enhance our technological capabilities in fraud detection.
About the job
Join us as a Fraud Analyst in London, where we are revolutionizing the travel industry.
Are you passionate about data analysis and fraud prevention? At Duffel, we are committed to simplifying travel by enhancing payment systems and ensuring secure transactions for over 4 billion airline passengers.
As a part of our dynamic London team, you will play a crucial role in identifying fraudulent activities, formulating detection rules, and collaborating with our engineering and data science teams.
If you thrive on solving complex challenges and making a significant impact, this is your opportunity to contribute to the future of travel!
About Duffel
At Duffel, we are on a mission to transform the travel experience by rebuilding the underlying infrastructure of the travel industry. Backed by notable investors such as Benchmark and Index Ventures, we are committed to creating tools that make travel effortless and secure.
Join Us in Shaping the Future of TravelTravel is an integral part of our lives, whether it's to reconnect with loved ones, embark on thrilling adventures, or navigate crucial business journeys. Unfortunately, the process of reaching our destinations can often be frustrating. Over 4 billion airline passengers currently depend on technology that has not evolve…
Join us as a Fraud Analyst in London, where we are revolutionizing the travel industry.Are you passionate about data analysis and fraud prevention? At Duffel, we are committed to simplifying travel by enhancing payment systems and ensuring secure transactions for over 4 billion airline passengers.As a part of our dynamic London team, you will play a crucial role in identifying fraudulent activities, formulating detection rules, and collaborating with our engineering and data science teams.If you thrive on solving complex challenges and making a significant impact, this is your opportunity to contribute to the future of travel!
Transforming Travel into an Effortless ExperienceAt Duffel, we believe travel should be seamless and enjoyable. Whether it's reconnecting with loved ones, embarking on thrilling adventures, or navigating pivotal business journeys, travel is vital to our lives. However, the traditional processes have often led to frustration and inefficiency. With over 4 billion airline passengers depending on outdated technology, we recognize the urgent need for innovation.That's why we're committed to revolutionizing the travel industry infrastructure. Join us as we simplify complex systems and create cutting-edge tools designed to make travel effortless and accessible for everyone.As proud alumni of Y Combinator's S18 cohort and backed by renowned investors including Benchmark, Blossom, Index Ventures, and Kima Ventures, we are poised to reshape the future of travel.The Finance Team at DuffelOur dynamic Finance team oversees comprehensive financial operations to support the Duffel Group, which encompasses six reporting entities across four regions. This role presents a unique opportunity for those eager to dive into a multifaceted position, fast-track their learning, and contribute to our exciting mission. You will manage vital aspects of financial operations, drive process enhancements, and apply sound business judgment in your responsibilities.Your Role as a Reconciliation SpecialistIn this critical position, you will manage reconciliation processes across diverse accounts and entities, ensuring the precision and reliability of financial records. Collaborating closely with the finance team and operations, you will maintain streamlined workflows, investigate discrepancies, and partner with product development for process automation. Your contributions will be essential in ensuring our financial data is accurate, trustworthy, and primed for high-level analysis, thereby supporting our agency operations.
Duffel is building infrastructure and tools to simplify travel for individuals and companies alike. The team’s mission is to make travel systems easier to use and more reliable. Supported by investors including Y Combinator, Benchmark, Blossom, Index Ventures, and Kima Ventures, Duffel focuses on improving the travel experience for airline passengers around the world. Role overview The Partnerships Operations Executive, based in London, plays a key part in Duffel’s global supply strategy, especially across airlines and new travel sectors. As Duffel expands its supplier network, this role ensures operational coordination and commercial accuracy. Daily work centers on keeping partnerships organized, transparent, and functioning smoothly. What you will do Performance reporting: Prepare and manage regular supplier performance reports for airlines, hotels, and other travel partners. Commercial oversight: Track commission structures, incentives, and contract terms to keep internal records up to date. Operational support: Coordinate tasks that help maintain efficient operational workflows. Requirements Experience: 2-4 years in travel partnerships, commercial operations, or airline account management. Industry knowledge: Familiarity with airline distribution systems (GDS and NDC) is a strong advantage. Data skills: Comfortable working with performance data, commercial reports, and commission models. Attention to detail: Careful and proactive in both strategic and routine tasks. Communication: Confident working with external partners and internal teams in a startup environment. Location This role is based in London, United Kingdom.
Join Duffel as a Backend Software Engineer and play a pivotal role in shaping the future of travel technology. We are seeking passionate individuals who thrive on solving complex challenges and are excited about creating scalable and efficient backend systems.
Travel Support Engineer (Backend)*Fullstack experience is a plus. London (Hybrid - 2 days onsite) Permanent | Visa sponsorship available | Immediate start Experience: Mid–SeniorTransform travel support with your expertiseAt Duffel, our passion for travel drives us to enhance the experience for every traveler. We understand the challenges faced when systems falter, and we are committed to developing innovative, efficient, and user-friendly support tools.In this position, you won't merely be coding; you'll play a key role in developing our first LLM-powered assistant within our support product. Your efforts will automate repetitive processes, allowing our Travel Operations team to tackle more complex issues, while creating enjoyable tools for travelers and colleagues alike. Each line of code you produce will make a significant difference.Key Responsibilities:• Develop full-stack features using React, TypeScript, Next.js, and Elixir that users engage with daily• Collaborate with designers to craft self-service tools that enhance traveler satisfaction• Integrate internal and external systems to deliver a seamless support experience• Streamline repetitive tasks, empowering your colleagues to focus on uniquely human challenges• Explore AI and automation technologies, contributing to the evolution of real-world applicationsIdeal Candidate:• Prioritizes the user experience over mere functionality• Enjoys simplifying complex challenges into clear, effective solutions• Exhibits curiosity about AI and automation, eager to integrate it into tangible products• Communicates technical concepts in a straightforward manner for broad understanding• Is passionate about delivering an exceptional user experiencePreferred Qualifications: Experience in SaaS/B2B, cloud platforms (GCP, Vertex AI), or familiarity with operational or support tooling.Why Join Us?At Duffel, you'll be part of a team that values meaningful work while fostering a fun environment: Competitive salary and potential equity Work From Anywhere – Choose your work location, locally or globally Duffel Travel Allowance – Experience the product you contribute to Generous parental leave Sabbatical programme – 3 months paid leave to recharge Visa sponsorship available Enjoy a vibrant Shoreditch office with regular team gatherings.
Join our dynamic team at Duffel as a Fraud Analyst in London, where you will play a crucial role in identifying and preventing fraudulent activities. Your keen analytical skills will be essential in assessing risks and implementing effective strategies to safeguard our operations. If you are passionate about leveraging technology and data analysis to combat fraud, we want to hear from you!
Join our dynamic team at duffel as a Customer Success Manager in London, where you will play a pivotal role in ensuring our clients achieve maximum value from our innovative travel technology platform. You will be responsible for developing strong relationships with our customers, understanding their goals, and proactively managing their success journey.Your efforts will not only enhance customer satisfaction but will also contribute to the overall growth of our business. If you are passionate about enhancing customer experiences and driving success, we would love to hear from you!
Full-time|£75K/yr - £140K/yr|Hybrid|London, England, United Kingdom
Corgi is an insurance carrier designed for tech startups, using AI to make underwriting and operations more efficient. With $108 million in funding and full licensing, Corgi is expanding into the UK and EU. The core platform runs on Django and uses Stripe for payments, blending strong engineering with insurance expertise. Role overview This Senior Backend Engineer role is based in London. The position centers on building and deploying products, often independently and without a fixed roadmap. Engineers who have shipped live projects, whether through side work, weekend builds, or prior roles, are especially valued. Key responsibilities Independently design, build, and launch backend systems and features. Turn ideas into production-ready products within tight timelines. Work with a Django-based stack, integrating Stripe and AI-driven workflows. Adapt to new technical challenges as the company grows. What Corgi looks for Proven ability to build and ship impactful projects independently. Comfort working at a startup pace, delivering results in hours or days. Ability to work across the stack and solve a range of technical problems. Strong opinions paired with openness to feedback and new ideas. Focus on outcomes and results rather than titles or hierarchy. High energy, collaborative spirit, and humility. How work happens at Corgi Quick decision-making, prioritizing action over waiting for perfect solutions. Products and improvements ship regularly, not just on a set schedule. Iterative development is preferred over long review cycles. Momentum is maintained even outside of major launches. Transparency is standard; decisions are made openly. Internal competition is encouraged to raise standards for everyone. This is a hands-on position for engineers who want to build and make an impact. Behaviors that lead to removal Office politics, blame-shifting, or gossip. Taking feedback personally rather than constructively. Introducing unnecessary bureaucracy. Missing deadlines after making commitments. How to apply Send links to your GitHub, personal website, or live projects you have shipped. CVs are not required. Email applications to: sergio@corgi.com Evidence of shipped work is required. Location and compensation London-based role, with on-site or hybrid options. Salary range: £75,000 to £140,000, plus equity. Salary depends on demonstrated ability to ship, not job title.
Join Our Dynamic Team at XapienAt Xapien, we empower businesses to truly understand their connections with suppliers, investors, partners, and third parties. Our innovative approach merges speed, scale, and precision, utilizing advanced AI technology.Since our inception in 2018, we've evolved from a deep-tech startup to a key player in AI-driven due diligence and risk intelligence. The year 2024 marked a significant milestone, with the successful closure of a $10M Series A funding round and accolades in the Chartis RiskTech100® and Everest Group’s Leading 50™. Our expansion has led to a broader product range, new market entries, and an expanding customer base.Our Growth TrajectoryWe're witnessing accelerated demand across various industries, especially in wealth management, financial services, and supply chain onboarding, extending our reach beyond the UK to customers in the Middle East, Asia, and Oceania.Why Now is the Perfect Time to Join UsThis position is not just another role; it’s a chance to influence the future of the due diligence sector with a market-leading product that organizations worldwide trust. Whether your expertise lies in marketing, communications, sales, or finance, your contributions will be vital in driving growth, enhancing credibility, and connecting our product with a swiftly changing market.As we scale rapidly, with an increasing number of customers and product releases, we face larger regulatory and market challenges. The expectation for real-time insights in due diligence is higher than ever. Your role will go beyond routine tasks; you will be shaping strategy, refining processes, and positioning a brand that is redefining trust and transparency.If you're passionate about learning, innovating, and making a meaningful impact, now is the time to join Xapien.The RoleWe are seeking a skilled Senior Backend Engineer to take on a pivotal technical leadership role within our engineering team. You will tackle our most complex technical challenges, take ownership of critical components within our platform’s architecture, and help guide our technical direction to ensure we continue to stay ahead in the industry.
Join us in revolutionizing travel!Travel is more than just a journey; it connects us with loved ones, opens up new adventures, and creates unforgettable experiences. Yet, the frustrations of travel can often overshadow the excitement. Over 4 billion airline passengers depend on outdated technology that fails to meet the expectations of today's connected traveler.At Duffel, we are on a transformative mission to modernize the travel infrastructure. We aim to simplify complex systems and develop innovative tools that ensure a seamless travel experience for everyone.As part of the Y Combinator S18 cohort, we are proudly backed by notable investors including Benchmark, Blossom, Index Ventures, and Kima Ventures, who have played a pivotal role in the growth of some of the world’s leading companies.Position OverviewIf you are passionate about customer success and excel at solving intricate technical challenges, this is the perfect opportunity for you. Duffel is seeking a Customer Success Engineer (CSE) to deliver expert technical support to our key clients. In this role, you'll assist customers by answering their inquiries and recommending effective ways to leverage our APIs to create outstanding travel experiences. Furthermore, you will work closely with various teams across Duffel, including Product, Engineering, Finance, and Travel Operations, to guarantee an exceptional customer journey with our products and services.
Join Aircall, a revolutionary unicorn in the AI-powered customer communications sphere, trusted by over 22,000 companies globally to enhance revenue, expedite issue resolution, and empower customer-facing teams. We are transforming the landscape of customer communications by integrating voice, SMS, WhatsApp, and AI into a unified workspace.Our growth is driven by a straightforward principle: to enable teams to work smarter, not harder. Our AI Voice Agent automates routine calls, while AI Assist simplifies post-call tasks, and AI Assist Pro provides real-time insights, allowing individuals to excel in their roles. This synergy results in increased revenue, quicker resolutions, and scalable teams.Headquartered in Paris, with a solid presence in North America anchored in Seattle, Aircall also has teams in vibrant cities such as Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our product is beloved by customers, and we are rapidly scaling, supported by top-tier investors and continuous AI advancements across multiple product lines.At Aircall, you'll become part of a dynamic company. We are ambitious, focused on product development, and execution-oriented, with a clear impact, swift decision-making, and genuine growth opportunities.Our Work Culture at Aircall: We prioritize customer satisfaction, leverage data for decision-making, and are dedicated to delivering significant outcomes. We cherish ownership, continuous improvement, and thoughtful agility. If you thrive in a collaborative, fast-paced environment where trust and impact are essential, you will thrive here.Position Overview:As a Senior Backend Software Engineer, you will take charge of designing, developing, deploying, and maintaining essential features that enhance customer value on our voice platform.You will be expected to advocate for best practices, mentor team members, and contribute to the broader Engineering community as part of your daily responsibilities.Quality, excellence, and agility are at the core of our delivery process, and you will play a pivotal role in elevating these standards.Utilizing a diverse array of backend technologies tailored to specific needs, all hosted on AWS, we create resilient services that deliver added value on top of voice while fully integrating with our customers' critical business tools (CRM, Helpdesk, E-Commerce, etc.).
Are you passionate about transforming the travel experience? Join Duffel as a Travel Support Consultant and help us revolutionize the way people travel.In this role, you will work UK business hours, with a degree of flexibility in your shift patterns. Your mission will be to assist travelers with their booking queries, ensuring exceptional service whether it’s through voluntary changes requested by passengers or involuntary changes from airlines.Travel opens up a world of possibilities, from visiting loved ones to embarking on new adventures or attending important business meetings. At Duffel, we recognize the challenges travelers face and are committed to making travel seamless and enjoyable.Having been part of the Y Combinator S18 cohort and supported by notable investors like Benchmark and Index Ventures, Duffel is at the forefront of transforming travel infrastructure. Join us on our mission to simplify travel systems and create tools that will make future travel effortless.About the Travel Operations TeamOur Travel Ops team is dedicated to managing all booking-related inquiries, ensuring that every traveler receives the highest level of customer service. This position goes beyond traditional customer support, allowing you to make a real impact on the travel experience.
About XapienAt Xapien, we redefine the landscape of due diligence by empowering businesses with essential insights about their suppliers, investors, partners, and third parties. Our innovative approach integrates speed, scale, and precision through advanced AI technology.Since our inception in 2018, we have evolved from a deep-tech startup into a significant global player in AI-enhanced due diligence and risk intelligence. The year 2024 marked a pivotal moment for us, as we secured a $10 million Series A funding, achieved accolades in the Chartis RiskTech100® and Everest Group’s Leading 50™, and broadened our product offerings and market reach.Looking ahead to 2025, we are poised for even greater achievements. As organizations face mounting compliance demands and heightened reputational risks, they are increasingly seeking intelligent, efficient solutions—turning to Xapien for rapid, reliable insights that transform days of manual research into actionable intelligence in mere minutes.Our Growth JourneyWe are proud to serve customers across a multitude of industries, with notable expansion in wealth management, financial services, and supply chain onboarding. Our reach extends beyond the UK, with a growing clientele in the Middle East, Asia, and Oceania.Why Join Us Now?This role offers a unique opportunity to influence the future of the due diligence industry with a leading product that global organizations trust. Regardless of your background—be it marketing, communications, sales, or finance—you will play a vital role in driving growth, enhancing credibility, and connecting our product with an ever-evolving market landscape.As we scale rapidly, with increasing customer demand, product releases, and complex regulatory challenges, the stakes are higher than ever. Due diligence now demands instantaneous insights that are delivered effectively and impactfully. Your contributions will transcend traditional roles, as you will help shape strategies, refine processes, and elevate a brand that is setting new benchmarks for trust and transparency.For those passionate about learning, innovating, and making a significant impact, now is the perfect time to join Xapien.The PositionWe are in search of a Senior Backend Engineer to become a pivotal member of our engineering team, tackling some of our most complex technical challenges. You will be responsible for owning critical components of our platform’s architecture, driving innovation and quality in our backend systems.
About 9fin9fin is a cutting-edge AI platform revolutionizing the global debt markets, which represent the largest asset class exceeding $145 trillion.The landscape of debt markets is extensive, global, and essential, yet it often relies on disjointed data, PDFs, and manual processes. 9fin transforms this outdated infrastructure by providing a unified platform that consolidates proprietary credit data, in-depth analysis, and efficient workflows across international markets.Currently, 9fin empowers over 300 prestigious institutions worldwide, including leading banks, asset managers, private equity firms, law firms, and consulting advisors. The company is experiencing rapid growth, particularly in the US, with exceptional retention rates driven by robust workflow adoption.We are at a pivotal moment. With a validated product-market fit and strong global demand, 9fin is propelling towards becoming the definitive platform for debt markets globally.What You'll Work OnAs a Senior Backend Engineer on our Structured Credit team, you will contribute to the development of our market-leading CLO product and assist in the launch of a new vertical.Our team is dedicated to making a significant impact, leveraging technology to create value for the business. While we have overarching business goals, we enjoy the autonomy to define our team objectives and determine our success metrics. We uphold accountability and proactive behaviors such as ownership.Lead projects within a cross-functional team by defining and designing systems, building proof of concepts, and delivering new service functionalities—including APIs, data processing, and automation—while collaborating with Product and Clients.Engage in backend development and engineering primarily on the services and web applications hosted on the 9fin platform.Play a crucial role within project teams as a senior individual contributor, conducting code reviews, mentoring fellow developers, and participating in early research and experimentation with new technologies to provide insights for new features and products.Continuously enhance the 9fin codebase by seizing opportunities to automate, refactor, and document processes when it has the most significant impact.Work across diverse web platforms involving complex financial data modeling, intricate access control logic, environmental data capture, integration of ML/AI prediction services, and data visualization.
Full-time|Remote|London - Remote in UK and Germany
About usOwkin is a pioneering AI company dedicated to unraveling the complexities of biology. Our goal is to develop the first Biology Super Intelligence (BASI) by integrating advanced biological large language models, diverse patient data, and intelligent software. Central to our innovation is Owkin K, an AI copilot, and our specially fine-tuned LLM, Owkin Zero, which researchers, clinicians, and drug developers utilize to gain deeper insights into biology, validate scientific hypotheses, and accelerate the delivery of improved diagnostics and therapies.Please submit your CV in EnglishAbout the role:As a Senior AI Backend Engineer at Owkin, you will be instrumental in developing our leading Agentic AI product for biomedical researchers by merging robust engineering practices with state-of-the-art AI technologies. You will engage with a real-time system that integrates LLMs, tool-calling, and interactive UI elements, ensuring our users can interact seamlessly with intricate, domain-specific data.This position demands a balance of traditional engineering principles and innovative methodologies as you integrate LLMs and AI into our technology stack. If you are passionate about building and enhancing a dynamic product, this opportunity is tailor-made for you.Your expertise and experience will be vital in steering our multidisciplinary team towards strategic choices and empowering your colleagues.In particular, you will:Collaborate within a multidisciplinary team of product managers, designers, software engineers, machine learning experts, and biomedical scientists.Design, build, and maintain scalable, reliable AI systems.Drive technical decisions and provide context-aware solutions for AI systems in biological research.Leverage and pioneer evaluation methodologies to ensure continuous product enhancement.Experiment with cutting-edge industry solutions, including orchestration patterns, fine-tuning, specialized monitoring, feedback loops, and more.Lead core stack component development with a focus on sustainability, scalability, security, reliability, and performance.Foster team growth by sharing your expertise and mentoring colleagues through code reviews, technical discussions, and knowledge sharing.About you...
About Mistral AIAt Mistral AI, we harness the transformative power of artificial intelligence to simplify daily tasks, save precious time, and enhance learning and creativity. Our innovative technology is crafted to seamlessly integrate into the fabric of everyday work life.We are on a mission to democratize AI through high-performance, optimized, and cutting-edge open-source models and solutions. Our robust AI platform is tailored to meet the diverse needs of enterprises, whether on-premises or in the cloud. Our flagship offerings include Le Chat, your AI assistant for both life and work.We pride ourselves on being a dynamic, collaborative team deeply passionate about AI and its potential to reshape society. Our diverse workforce thrives in competitive environments and is dedicated to fostering innovation. With teams distributed across France, the USA, the UK, Germany, and Singapore, we embody creativity, humility, and a strong team spirit.Join us on this exciting journey as we shape the future of AI, making a meaningful impact together. Discover more about our vibrant culture at https://mistral.ai/careers.Role OverviewWe are on the lookout for passionate and talented Software Engineers to join our team. As a Backend Engineer, you will play a pivotal role in developing the core systems that power our key products: AI Studio, Le Chat, and Mistral Code. You will shape how users and developers interact with our AI platform at scale. Your focus will be on building reliable, high-performance backend systems and APIs that support millions of users and developers. Your contributions will directly enhance the user and developer experience, making it more engaging, efficient, and intuitive. We welcome engineers at all levels, from fresh graduates to seasoned professionals who are eager to learn, collaborate, and deliver impactful solutions.Key ResponsibilitiesBased on your expertise, you will engage in crucial components of our technology, including:Backend Development- Design, develop, and maintain scalable and robust backend features and APIs using modern frameworks.- Ensure high performance and reliability across our distributed systems.- Contribute to systems that support authentication, billing, AI tooling, and observability.
Full-time|Hybrid|London, England, United Kingdom (Hybrid)
Join commercetools as a Senior Backend Engineer, where you will play a pivotal role in shaping innovative backend solutions using TypeScript. Collaborate with cross-functional teams to create scalable and resilient microservices that empower our clients to deliver exceptional digital commerce experiences.
About the CompanyAffinidi is a pioneering technology firm focused on reimagining data ownership. We empower both businesses and individuals to take control of their data, providing a holistic approach to managing their digital identity while prioritizing privacy and security.Our innovative technology facilitates decentralized digital identity solutions, ensuring that everyone has the right to own and govern their data. We are dedicated to establishing a trustworthy ecosystem for digital credentials that allows secure data and service exchange across various sectors and borders. About the Role: We are seeking a solution-driven Senior Backend Engineer who possesses substantial expertise in Rust. The ideal candidate will have a track record of delivering robust backend solutions and is eager to contribute to our mission of transforming digital identity.
About UsAre you ready to embark on a thrilling challenge?At XYZ Reality, a dynamic and award-winning Series-A startup, we're on a rapid ascent toward our next funding milestone. Our vision is to revolutionize the construction sector by enhancing our platform's features, performance, and scalability.We thrive in a fast-paced, multi-disciplinary environment, engaging in various domains such as cloud development, electronics, embedded software/hardware, mechanical design/manufacturing, AI & computer vision, and data science—all contributing to our innovative BIM Platform.To propel this mission forward, we are in search of a Backend Engineer with extensive Node.js experience to assist in our transition from Java to Node.js and develop high-performance, scalable backend services. You will collaborate closely with our API development, client applications, and data pipeline teams to design and deliver robust, efficient solutions.Our office is situated in central London, just a short stroll from Angel Station.
