Backend Developer jobs in London hiring now at vetted startups and product companies on Alion, updated daily. Average salary around $190,840/year. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.
freetrade.io · HQ: London, United Kingdom · Investing Apps & Robo-Advisors · Online Brokerage & Trading Platforms · 51-200 employees · Est. 2016 · Hiring 3, 1 new
HQ: London, United Kingdom · Investing Apps & Robo-Advisors · Online Brokerage & Trading Platforms · 51-200 employees · Est. 2016 · Hiring 3, 1 new
Freetrade is a London company founded in 2016 that offers commission free share dealing through a mobile app. It gives retail investors access to British, American and European equities alongside tax efficient accounts and pensions. The company was acquired by IG Group in 2025 while continuing to run its own platform.
worldpay.com · HQ: Cincinnati, United States · Payment Processing & Gateways · 1001-5000 employees · Est. 1971 · Trust B · Hiring 29
HQ: Cincinnati, United States · Payment Processing & Gateways · 1001-5000 employees · Est. 1971 · Trust B · Hiring 29
Worldpay is one of the largest merchant acquirers in the world, processing card and alternative payments for merchants across ecommerce, retail, restaurants and enterprise. Its history runs through NatWest, Royal Bank of Scotland, Vantiv and FIS, and it was separated from FIS in 2024 under GTCR ownership before agreeing to combine with Global Payments in 2025. Headquartered in Cincinnati with major operations in London, it handles payments in more than one hundred and forty currencies and competes with Stripe, Adyen and the bank-owned acquirers for large international merchants.
≈ $87k – $174k per year (Estimated) · Lead · 7+ years exp · Hybrid (London, United Kingdom, Atlanta, Cincinnati, United States) · Bachelor's Degree · Full-Time · Staff
smarkets.com · HQ: London, United Kingdom · Sports Betting · 51-200 employees · Est. 2008 · Hiring 5
HQ: London, United Kingdom · Sports Betting · 51-200 employees · Est. 2008 · Hiring 5
Smarkets is a technology company that runs a prediction market and betting exchange covering sports and political markets. It has handled over 29 billion pounds in volume since 2010 and serves more than 200,000 traders worldwide. The company is headquartered in London, United Kingdom.
daintta.com · HQ: London, United Kingdom · Information Security · Management Consulting · 51-200 employees · Est. 2019 · Hiring 16
HQ: London, United Kingdom · Information Security · Management Consulting · 51-200 employees · Est. 2019 · Hiring 16
Daintta is a values-driven consultancy delivering data, technology and engineering solutions across the UK public sector. It partners with clients in defence, national security, law enforcement and wider government, and hires platform engineers, quality assurance engineers and cyber security consultants. The company is headquartered in London, England, United Kingdom.
Transak is a fiat-to-crypto payments company founded in 2019 and headquartered in London. Its developer integration lets wallets, games and marketplaces accept local payment methods in more than a hundred countries. The company handles identity verification, licensing and settlement on behalf of the applications that embed it.
fuseenergy.com · HQ: London, United Kingdom · Ride Hailing · Energy & Utilities · Wind Energy · Solar Energy · 501-1000 employees · Est. 2022 · Startup · Trust A · Hiring 67, 5 new
HQ: London, United Kingdom · Ride Hailing · Energy & Utilities · Wind Energy · Solar Energy · 501-1000 employees · Est. 2022 · Startup · Trust A · Hiring 67, 5 new
Fuse Energy is a British household energy supplier headquartered in London, founded by former Revolut executives. It was the first new domestic energy supplier in Great Britain since the 2021 energy crisis and operates its own renewable generation assets.
HQ: Maidstone, United Kingdom · Commerce · Cybersecurity · Fraud Detection · 11-50 employees · Est. 2024 · Hiring 5
Fraud prevention and payment solutions that adapt to your challenges, risk appetite & goals so you can combat the fraud of today and be ready for tomorrow.
coreweave.com · HQ: Livingston, United States · Data Centers & Colocation · Cloud Platforms (IaaS & PaaS) · AI Compute & Inference · 1001-5000 employees · Est. 2017 · NASDAQ: CRWV · Trust B · Hiring 296, 4 new
HQ: Livingston, United States · Data Centers & Colocation · Cloud Platforms (IaaS & PaaS) · AI Compute & Inference · 1001-5000 employees · Est. 2017 · NASDAQ: CRWV · Trust B · Hiring 296, 4 new
Headquartered in Livingston, New Jersey, CoreWeave is a specialized artificial intelligence cloud computing enterprise providing high-performance GPU infrastructure. The company operates a global network of cloud data centers optimized for compute-intensive workloads, including large language model (LLM) training, generative AI inference, high-performance computing (HPC), and visual effects rendering. By deploying large-scale NVIDIA GPU clusters with Kubernetes-native software architecture, it delivers bare-metal compute acceleration and scalable infrastructure for AI research labs, tech enterprises, and digital developers worldwide.
cohere.com · HQ: Toronto, Canada · LLM & Generative AI · Foundation Models · AI Agents · 1001-5000 employees · Est. 2019 · Trust A · Hiring 117, 8 new
HQ: Toronto, Canada · LLM & Generative AI · Foundation Models · AI Agents · 1001-5000 employees · Est. 2019 · Trust A · Hiring 117, 8 new
Cohere is a Canadian artificial intelligence company founded in Toronto in 2019 by researchers including one of the co-authors of the transformer architecture paper. It builds large language models aimed specifically at enterprise use rather than consumer chat, with a product line covering text generation, embeddings, reranking and an agent platform, and it emphasises private deployment inside a customer's own cloud or data centre for regulated industries. The company has raised substantial funding from technology and industrial investors, and partners with cloud providers and system integrators to reach banking, healthcare and public sector customers.
comind.io · HQ: London, United Kingdom · Neurotech & Neuromodulation · Est. 2018 · Startup · Hiring 9, 1 new
HQ: London, United Kingdom · Neurotech & Neuromodulation · Est. 2018 · Startup · Hiring 9, 1 new
About Our mission is to redefine the way the brain is measured and treated to optimise patient outcomes across the care continuum. CoMind is a team of highly skilled and passionate individuals working towards the development of innovative neuromonitoring devices and neural interfaces.
xyzreality.com · HQ: London, United Kingdom · Construction · Construction Management Software · AR & VR Software · 51-200 employees · Est. 2017 · Startup · Trust B · Hiring 42, 6 new
HQ: London, United Kingdom · Construction · Construction Management Software · AR & VR Software · 51-200 employees · Est. 2017 · Startup · Trust B · Hiring 42, 6 new
XYZ Reality is a construction technology company that builds Atom, an engineering-grade augmented reality headset that overlays 3D BIM models on a building site with millimetre accuracy. Site engineers and surveyors use it to set out work and check installation against design on data centers, pharmaceutical plants and other complex projects in the United Kingdom, Europe and the United States. Founded in 2017, the company is headquartered in London, United Kingdom.
thehumanoid.ai · HQ: London, United Kingdom · Industrial Robotics · Logistics & Warehouse Robotics · Robotics AI · Humanoid Robots · 201-500 employees · Est. 2024 · Startup · Trust B · Hiring 88, 4 new
HQ: London, United Kingdom · Industrial Robotics · Logistics & Warehouse Robotics · Robotics AI · Humanoid Robots · 201-500 employees · Est. 2024 · Startup · Trust B · Hiring 88, 4 new
Humanoid is a British robotics company founded in 2024 that is developing general-purpose humanoid robots for industrial and logistics work. Its argument for a human form is practical rather than aesthetic: warehouses, factories and buildings were designed around human reach, stride and grip, so a robot shaped like a person can be deployed without rebuilding the environment around it. Headquartered in London and backed by venture investors, it is developing both a wheeled and a bipedal platform and competes with considerably better-funded American and Chinese efforts in the same field.
semaloop.com · HQ: London, United Kingdom · AI Agents · Software Testing & QA · Est. 2025 · Startup · Hiring 1
HQ: London, United Kingdom · AI Agents · Software Testing & QA · Est. 2025 · Startup · Hiring 1
Semaloop is a software testing start-up that builds AI agents that test mobile apps like real users across key flows. It uses computer vision on real devices to catch mobile bugs and has raised funding from venture investors. The company is headquartered in London, United Kingdom.
voize.com · HQ: Berlin, Germany · EHR & Clinical Software · Speech & Audio AI · Medical AI · Est. 2020 · Startup · Trust B · Hiring 37, 1 new
HQ: Berlin, Germany · EHR & Clinical Software · Speech & Audio AI · Medical AI · Est. 2020 · Startup · Trust B · Hiring 37, 1 new
voize is a German health technology company that develops a voice assistant for nursing care, letting nurses and carers dictate observations by smartphone while its speech AI turns them into structured documentation in the care provider's records system. Founded in 2020, it serves nursing homes, home care services and hospitals, mainly in Germany, and hires backend, fullstack and speech machine learning engineers and customer training staff. The company is headquartered in Berlin, Germany.
≈ $71k – $144k per year (Estimated) · Senior · Berlin · Paris · London · Munich · Hamburg · Remote (Germany, France, United Kingdom) · Freelance · Senior · German: C1
Apron is a payments company, founded in 2021, that helps small and medium businesses manage cash flow by making payments faster and less manual. Its vacancies include customer service representatives, product designers for core payments and senior backend software engineers. The company is headquartered in London, United Kingdom.
