Backend Software Engineer - London £75-140k + Equity

Corgi builds insurance products for tech startups in the UK and EU, using AI-driven underwriting and a platform built on Django and Stripe. With $108M in funding and a licensed carrier status, the company focuses on new solutions tailored for the startup ecosystem. Role overview This backend software engineering position is based in London. Engineers here build and deploy products quickly, often working independently. The team values those who have taken projects from concept to launch, especially if they can point to live products or side projects with active users. What matters here Comfort with the pace and demands of a startup Proven ability to independently ship real projects Delivers results in hours or days, not weeks Works across the stack and adapts to new problems Shares strong opinions but stays open to better ideas Keeps ego low and focuses on real contributions How the team operates Quick decision-making, prioritizing progress over perfection Frequent product launches and process updates Short review cycles and regular releases High energy during launches, few quiet stretches Transparency in decisions and team communication Healthy internal competition that raises performance This is a build-focused role where steady contribution is expected. Behaviors that do not fit Office politics or gossip Taking feedback personally instead of using it constructively Introducing unnecessary bureaucracy Missing commitments or slow follow-through How to apply Send links to your GitHub, personal site, or live projects you have built and launched Do not send a CV Email your application to: sergio@corgi.com If you cannot show evidence of previous work, this role is not a fit Location and compensation London-based; on-site or hybrid options available Base salary ranges from £75,000 to £140,000, plus equity Compensation is based on proven ability to ship, not job titles

Corgi is an AI-driven insurance company serving tech startups. With $108 million in funding and full regulatory approval, Corgi operates as a licensed carrier. The platform is built with Django and uses Stripe for payments, while AI-enhanced underwriting powers the core product. Corgi is now expanding into the UK and EU markets. Role overview This Backend Software Engineer position is based in London. The role centers on building and shipping products from idea to live deployment. Candidates who have shipped side projects, launched products, or built anything that reached real users or traffic will stand out. The focus is on creating and delivering, not maintaining or coasting. What Corgi values Readiness to work at a startup's pace Proven track record of independently developing and launching projects Focus on outcomes, delivering results in hours or days Adaptability across the tech stack and willingness to tackle new challenges Strong opinions paired with openness to feedback Low-ego, motivated by impact rather than titles Team culture Quick decision-making, prioritizing progress over perfection Frequent product launches and process updates Ship-and-iterate approach instead of long review cycles Consistent intensity, both during launches and quieter periods Transparent decision-making Internal competition to drive high performance Behaviors that are not a fit Office politics or avoiding responsibility Taking feedback personally rather than using it for growth Adding unnecessary complexity Missing commitments or failing to deliver promptly How to apply Send links to GitHub, personal websites, live projects, or any shipped work. Do not send a CV. Email applications to: sergio@corgi.com. Evidence of shipped projects is required for consideration. Location and compensation This position is based in London, with on-site or hybrid options. Base salary ranges from £75,000 to £140,000, plus equity. Demonstrated ability to ship products is valued more than job titles.

Corgi is a licensed insurance carrier focused on tech startups, using AI to simplify and speed up coverage. The company has raised $108M and is expanding across the UK and EU. The platform relies on Django, integrates Stripe for payments, and features AI-driven underwriting. Role overview This founding engineer role is based in London and centers on building and launching new products, often independently. Corgi values engineers who turn ideas into live products, rather than following detailed roadmaps. Evidence of shipped side projects, weekend builds, or products that have reached real users is highly regarded. Who succeeds here Track record of independently building and delivering real projects Comfortable working across the full technology stack Delivers results quickly, in hours or days Low-ego, motivated by results rather than titles Open to feedback and willing to adopt better ideas Thrives in a high-energy startup setting How we work Decisions are made quickly; perfection is not the goal Products and processes ship regularly, not just quarterly Iteration happens after shipping, not after long review cycles High intensity during launches, with a steady pace year-round Transparent decision-making; no closed-door policies Internal competition is encouraged to raise standards This is a hands-on role for builders who want to make things happen. Behaviors that don’t fit Office politics, gossip, or avoiding responsibility Taking direct feedback personally instead of constructively Adding unnecessary overhead instead of streamlining Missing deadlines after committing to them Application process Send links to your GitHub, personal website, live projects, or shipped products CVs are not accepted Email applications to: sergio@corgi.com Evidence of shipped work is required for consideration Location and compensation Role is based in London; on-site or hybrid arrangements available Base salary: £75,000–£140,000, plus equity Salary band reflects proven shipping ability, not job titles

Corgi develops insurance products for technology startups using AI, Django, and Stripe. Backed by $108M in funding and licensed as a carrier, the company is expanding throughout the UK and EU. The engineering team builds new ways to deliver insurance, focusing on rapid product development and real-world impact. Role overview This Python Engineer role is based in London and suits builders who enjoy taking ideas from concept to launch. The team values independent thinkers who have shipped products, whether side projects, weekend experiments, or anything with real users. Engineers here often work autonomously and see projects through from start to finish. What we look for History of independently building and launching projects Ability to work across the stack and learn quickly Delivers results in short cycles, progress is measured in hours and days Strong opinions, but open to better approaches Focus on outcomes, not titles; low-ego attitude Work culture Quick decision-making; perfection is not required Frequent product launches and improvements Ship-and-iterate approach, rather than long review cycles High energy during launches, steady pace between projects Transparent, public-first decision-making Internal competition helps raise standards This position fits those who want to make a real impact, not those seeking to coast. Behaviors that won’t fit Avoiding accountability or engaging in office politics Taking feedback personally instead of using it to improve Adding unnecessary complexity Missing agreed deadlines How to apply Send links to your GitHub, personal site, live projects, or anything you’ve built and launched Resumes are optional Email applications to: sergio@corgi.com If you cannot show evidence of shipped work, this role is unlikely to be a fit Location and compensation London-based (on-site or hybrid options) Base salary: £75,000 to £140,000, plus equity Salary depends on shipping ability, not job title

Corgi builds insurance products for tech startups, using AI to drive its platform and underwriting. With $108 million raised and a carrier license in place, Corgi operates with regulatory approval and is expanding into the UK and EU. The core technology stack includes Django and Stripe for payments. Role overview This Full-Stack Software Engineer position is based in London. The work centers on building and deploying products independently, rather than following detailed roadmaps. Candidates who have shipped real products, whether side projects, weekend builds, or anything with actual users, will stand out here. What we look for Engineers who take ideas from concept to live product, hands-on. Proven experience shipping projects independently. Comfort working across the stack and adapting quickly to new challenges. Focus on achieving results in hours and days, not just over long sprints. Openness to feedback and new approaches, paired with strong opinions. Low-ego, outcome-driven mindset. How we work Decisions happen quickly, waiting for perfect solutions is not the norm. New products and changes go live regularly, not just quarterly. Shipping and iterating take priority over lengthy review cycles. Intensity remains high during both launches and quieter periods. Transparency matters; decisions are made openly. Internal competition is encouraged to raise the bar for everyone. This is a build-focused role. Coasting is not part of the culture. Behaviors that won't fit Office politics, gossip, or avoiding responsibility. Taking feedback personally rather than using it to improve. Adding unnecessary complexity instead of simplifying. Missing deadlines after making commitments. How to apply Share links to GitHub, personal sites, live projects, or any deployed products. CVs are not accepted. Email applications to: sergio@corgi.com If you cannot provide evidence of shipped work, this role is likely not a match. Location and compensation London-based, with on-site or hybrid options. Base salary: £75,000 to £140,000, plus equity. The salary range reflects a focus on demonstrated ability to ship, not job titles.

Corgi builds insurance products for tech startups, using AI to power underwriting and Django as the main platform. With $108 million raised and a full license as a carrier, Corgi is expanding into the UK and EU. The company integrates Stripe for payments and emphasizes rapid growth and innovation. Role overview This High-Intensity Engineer role in London is designed for builders who take projects from idea to live product with little direction. The position favors those who have shipped real products, whether personal projects, weekend builds, or anything with active users. Corgi cares about what has been launched, not job titles or formal credentials. What matters at Corgi Strong motivation and energy that matches startup demands A personal record of delivering projects independently Ability to turn ideas into results quickly, often in hours or days Comfort working across the full stack and tackling varied challenges Clear opinions with openness to better approaches Focus on outcomes and performance, not hierarchy How the team operates Quick decision-making, prioritizing action over perfection Frequent shipping of products and process improvements Minimal review cycles, favoring a ship-and-iterate approach High intensity during launches, steady engagement otherwise Transparent decisions, no closed-door meetings Internal competition used to raise standards This position is for those who want to build and ship, not coast. Behaviors that lead to quick removal Engaging in politics, avoiding responsibilities, or gossiping Taking feedback personally instead of improving from it Adding unnecessary processes rather than streamlining work Missing commitments or failing to deliver on time How to apply Send links to GitHub, personal sites, live projects, or any shipped work Do not send a CV Email applications to: sergio@corgi.com This role requires proof of shipped work Location and compensation London-based, with on-site or hybrid options Base salary: £75,000 to £140,000, plus equity Compensation is based on ability to ship products, not job title

Corgi builds AI-powered insurance products for tech startups, operating as a licensed carrier with $108M raised. The team is expanding into the UK and EU, using a platform built on Django, Stripe for payments, and advanced AI underwriting. Role overview This Full-Stack Engineer role is based in London. The work centers on turning concepts into live products quickly, using the full technology stack. The team values those who enjoy building and shipping, rather than just designing or planning. Projects move from idea to launch at a fast pace, with engineers expected to execute and deliver real products for real users. What we value Experience independently building and launching polished products for actual users and real traffic Ability to make progress in hours and days, not months or quarters Comfort working across the stack and tackling new technical challenges as they arise Strong opinions paired with openness to feedback and change A humble approach and drive to improve both products and processes How we work Decisions happen quickly, without waiting for perfect information New products and process improvements ship regularly Iteration is valued over endless review cycles High energy during launches, steady focus during quieter periods Open communication and transparency are prioritized Healthy internal competition is encouraged to raise the bar This environment suits those who take pride in building and shipping. It is not a fit for those looking to coast. Behaviors that don’t fit here Engaging in office politics, blame, or gossip Treating direct feedback as personal criticism Adding unnecessary complexity instead of simplifying Missing deadlines after committing to them How to apply No CV required. Instead, send links to your work, such as GitHub, a personal website, live projects, or anything you’ve built and launched, to sergio@corgi.com. If there is no shareable work, this role likely isn’t the right match. Location This position is London-based. Both on-site and hybrid arrangements are available. Compensation Salary ranges from £75,000 to £140,000, plus equity. The range reflects a focus on what you can ship, not just your title.

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.

About JuniorAt Junior, we are on a mission to revolutionize the investment research landscape with innovative LLM-powered tools designed specifically for private market investors. Our clientele includes some of the world's leading private equity and consulting firms, collectively managing billions in annual investments. As a profitable and bootstrapped enterprise, we have grown our team to 24 talented individuals across our London and NYC offices, and we achieved a remarkable 10x revenue growth in 2025.Discover more about our mission and values here. Role DescriptionAs our first dedicated Backend Engineer focused solely on our internal go-to-market and operations stack, you will play a pivotal role in shaping our technology framework. Your responsibilities will include:Crafting an AI-first tech stack from the ground up, influencing infrastructure decisions and priorities.Rapidly deploying internal tools and receiving immediate feedback from your team members, who will quickly become your strongest advocates!Developing and managing our data warehouse and internal data architecture.Engaging in innovative projects that leverage LLMs, automation, and advanced agent technologies.Cultivating our engineering culture. Sample Set of ProjectsUser Health Reporting + CRM Data Quality: Automate data pipelines to enhance metrics visibility in BI dashboards and ML evaluations, while establishing alert systems for risk signals.User Feedback Integration: Develop a tool that summarizes user feedback calls, prioritizes feature requests, and communicates findings to our Product team.Billing and Invoicing: Implement complex B2B pricing models encompassing usage-based, seat-based, and platform fees, while automating financial reconciliation processes.Data Warehouse Development: Create a data warehouse to integrate product, CRM, and operational data, and generate tailored dashboards for different teams. About YouWe are searching for a backend/data engineer who...

alten seeks a Backend Software Engineer for its Space Department in London. This role centers on developing software solutions that contribute to important projects and advance the team's technology. Role overview The Backend Software Engineer will work on building and maintaining systems that support the department's ongoing initiatives. The position involves collaborating with colleagues to deliver reliable and effective backend solutions. Location This position is based in London.

Join Edra: Pioneering Solutions in Enterprise AIAt Edra, we're tackling one of the most challenging issues in enterprise AI: while AI models are inherently generic, company processes are uniquely specific. Our mission is to develop AI agents that comprehend how these processes operate and effectively manage their tasks.As a Series A startup, we are proudly supported by Sequoia and other prestigious venture capital firms. With our teams expanding in New York and London, we are a highly technical group comprising engineers, AI researchers, and strategists who all uphold a rigorous standard for talent. We believe that exceptional individuals are the cornerstone of our future success.Your RoleWe seek dedicated Backend Engineers who are passionate about the art of software development. Your focus will be on implementing strong typing, thoughtful API design, and robust data modeling. You will not be developing AI models; instead, you will construct the surrounding ecosystem: the platform, workflows, interfaces, integrations, and observability that render our AI applicable in real-world scenarios. As one of the early engineers at Edra, you will have the opportunity to influence not only the product but also the engineering culture, tooling decisions, and technical frameworks upon which our company is built.Our approach is intentional and thorough. There is no distinction between 'building it' and 'shipping it'—you will oversee the journey from conceptualization to deployment, taking full ownership of your outcomes. We prioritize thoughtful development over speed, striving for a balance between velocity and quality.Key ResponsibilitiesDesign and implement platform systems utilizing Python (FastAPI), including API contracts, database schemas, and infrastructureDevelop and sustain connectors, integrations, and data pipelines that link our platform to external systemsCreate internal libraries, tools, and interfaces that enhance the productivity of the engineering teamTake full ownership of your work by gathering context, managing dependencies, and driving tasks to completion independentlyEngage in multiple roles across the stack—design a schema in the morning, develop the API layer in the afternoon, and troubleshoot a deployment issue by day’s endParticipate in weekly product meetings, understand user interactions with your creations, and help shape future developmentsCollaborate daily with a small, elite team of engineers and AI specialistsHave a direct impact on the technical direction: select tools, establish patterns, and define conventions for the team

Role overview airapps is hiring a Backend Engineer for its London Metropolitan Area team. This role focuses on designing and building scalable server-side applications that support the company’s products and services. What you will do Work closely with colleagues across different functions to develop backend systems Contribute to the architecture and implementation of server-side features Help ensure backend solutions can scale and perform reliably Location This position is based in the London Metropolitan Area.

Join Us as a Senior Backend Software EngineerAt Freetrade, our mission is clear: to simplify investment for everyone. Investing shouldn’t be a convoluted or costly endeavor that deters individuals from maximizing their savings. We’re here to change that narrative!As we expand our team, we are searching for passionate individuals eager to redefine how our customers invest and enhance their wealth. If you are motivated by solving intricate problems and crafting innovative products, you will thrive in our environment.With a significant milestone approaching in 2026, following our transformative agreement to join the IG Group, we will continue to operate independently while benefiting from the resources and expertise of a leading player in the industry.This year marks a pivotal moment for us as we accelerate our product roadmap, introducing exciting new features including mutual funds, bonds, and family investment tools. We are also exploring the potential of AI to further enhance our customer experience.Our cloud-native infrastructure relies on Google Cloud Platform tools such as Firestore, Google Kubernetes Engine, PubSub, and Cloud SQL, enabling us to deliver a reliable and efficient platform built with Typescript. Here, your contributions will have a direct and positive impact on both customer experience and our overall business strategy. If you are eager to expand your technical expertise, contribute to new product development, and work in a creative, experimental atmosphere, this role is perfect for you!Why You Should Join Our Engineering Team?Become a vital part of a team that is shaping the future of investment. As a Senior Backend Software Engineer, you will lead the comprehensive development of impactful features, demonstrating your passion for independent problem-solving while scaling our next-generation, user-centric products. Our ideal candidate thrives in a dynamic, fast-paced environment and enjoys crafting innovative solutions.

Join our innovative team at reteam as a Backend Engineer! In this role, you will collaborate with cross-functional teams to develop robust backend solutions that power our applications.We are looking for an enthusiastic engineer who is passionate about creating efficient and scalable systems. Your expertise will contribute to enhancing our product offerings and improving user experiences.

Join Apron as a Senior Software Engineer - BackendAt Apron, our mission is to empower small and medium-sized businesses by ensuring their success. We understand that cash flow challenges often stem from the pressure of demand payments on business owners, which can hinder their ability to meet these obligations.We are bridging this gap by modernizing and simplifying the payment processing experience: from capturing invoices to issuing expense cards, and facilitating transactions—all in one seamless platform.As a rapidly growing company, we have expanded our team to approximately 100 talented individuals across the UK, Germany, Spain, and beyond. Backed by notable investors such as Index Ventures, Bessemer Venture Partners, Zinal Grow, and Tony Fadell, we have successfully raised $50 million to fuel our growth.Our Engineering CultureAt Apron, engineers play a pivotal role in our operations. Here's what you can expect:Customer-Centric Development: We utilize cutting-edge technology to create products that genuinely enhance our customers' lives.Ownership of Projects: From planning to execution, we take full responsibility for our work.Complex Financial Challenges: We embrace the intricacies of finance, navigating complex business logic and ensuring every detail is accounted for. Precision and attention to detail are paramount in creating a reliable product.Pride in Our Code: We prioritize building fast, secure, and scalable code that can grow with us.Integration of AI Tools: We leverage the best available technologies to ensure our product is genuinely beneficial.Your ResponsibilitiesWe are looking to expand our Card team, which has just launched. As a Senior Software Engineer, you will:Collaborate Across Teams: Work closely with Frontend Engineers, Product Managers, and Designers to develop innovative features.Design Robust Systems: Develop core financial integrations to ensure the security of customer funds and expedite transactions.Drive Innovation: Share your expertise with the team to foster innovation and proactively suggest improvements.

Join Nevis: Pioneering AI Wealth ManagementAt Nevis, we're on a mission to revolutionize wealth management through cutting-edge AI technology. Our innovative platform is designed to empower financial advisors, enabling them to enhance client relationships while our AI automates time-consuming workflows. As we build the future of wealth management, we have secured $40 million in funding from top-tier investors including Sequoia Capital, ICONIQ, and Ribbit, and are led by a talented team of ex-Revolut executives.Your Impact as a Software Engineer (Python)We are seeking a talented Software Engineer (Python) who is passionate about developing robust AI-driven platforms. In this key role, you will design and implement Python-based systems and services that drive intelligent workflows for leading financial firms. You will work on applied AI, data pipelines, model execution frameworks, and backend components that support our innovative AI products.If you thrive in a fast-paced environment, love creating production-grade AI solutions, and are eager to see your ideas come to life quickly, Nevis is the place for you. You'll join a world-class engineering team dedicated to building scalable AI systems.Your ResponsibilitiesDesign and enhance Nevis’ Python-based AI platform, enabling core workflows and agentic automation.Develop model orchestration, data processing pipelines, and execution runtimes for our applied AI features.Create scalable APIs and services that facilitate rapid development and deployment of AI systems.Architect systems for model inference, prompt execution, and multi-step agent reasoning.Maintain high engineering standards through clean code practices and CI/CD workflows.Collaborate with AI engineers, product managers, and designers to deliver impactful features used by thousands.Take ownership of greenfield AI platform components, from architecture to production.Engage in design and code reviews that shape Nevis’ technical future.

Who We AreLightning AI is the innovative force behind PyTorch Lightning, established in 2019. We provide a comprehensive platform designed to streamline the development, training, and deployment of AI systems, effectively bridging the gap between research and production.Our merger with Voltage Park, a neocloud and AI Factory, empowers us to combine developer-centric software solutions with economical, large-scale computing capabilities. We equip teams with essential tools for experimentation, training, and production inference, ensuring built-in security, observability, and control.We cater to solo researchers, startups, and large enterprises alike, operating globally with offices in cities such as New York City, San Francisco, Seattle, and London. Our efforts are supported by notable investors including Coatue, Index Ventures, Bain Capital Ventures, and Firstminute.What We’re Looking ForWe are seeking a skilled Backend Engineer to develop and enhance the Lightning AI platform across various components, from the frontend and CLI to API, billing, security, and integrations. You will take full ownership of key features, driving development from concept to production while collaborating with a talented team of engineers, product managers, and designers. This role offers the chance to create groundbreaking technology that will revolutionize the machine-learning ecosystem!This hybrid position is based in our London office with a requirement of 2 in-office days per week. The salary range for this role is $120,000 - $250,000.

Role Overview hook is hiring a Backend / Fullstack Engineer in London. This role involves building server-side applications and contributing to front-end features that improve how users interact with our products. What You Will Do Develop and maintain backend systems Work on front-end components to support a seamless user experience Participate in the full software development lifecycle, from initial idea through deployment Who We’re Looking For Comfortable working with both backend and frontend technologies Interested in taking projects from concept to launch Ready to collaborate with a team in London

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.

Join our innovative team as a Backend Engineer! At Lever, we are committed to revolutionizing the way companies recruit and hire top talent. Our cutting-edge software is trusted by industry giants such as Netflix, Shopify, and Spotify. As we expand, we are on the lookout for passionate individuals to help us lead the charge in transforming talent acquisition.Lever has been recognized as the #1 place to work in San Francisco and is celebrated as one of the best workplaces across the United States. Our 'Leveroos' are our greatest asset, and we pride ourselves on fostering a culture that prioritizes our people. If you're ready to make a significant impact on how the world hires, this is the opportunity for you!