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.
nationwide.co.uk · HQ: Swindon, United Kingdom · Commercial & Retail Banks · Mortgage Lending & Brokers · 5000+ employees · Est. 1884 · Hiring 139, 23 new
HQ: Swindon, United Kingdom · Commercial & Retail Banks · Mortgage Lending & Brokers · 5000+ employees · Est. 1884 · Hiring 139, 23 new
Nationwide Building Society is a UK mutual financial institution headquartered in Swindon, England, providing mortgages, current accounts, savings, credit cards and business banking to its members. Owned by its members rather than shareholders, it is the largest building society in the world, operates a national branch network and acquired Virgin Money UK in 2024. Its openings span software, data and integration engineering, analytics, compliance, risk and audit roles, mortgage technical delivery, customer support and branch management, mainly in Swindon, London, Northampton and Glasgow.
seedtag.com · HQ: Madrid, Spain · Artificial Intelligence · Advertising · Est. 2014 · Hiring 14, 2 new
HQ: Madrid, Spain · Artificial Intelligence · Advertising · Est. 2014 · Hiring 14, 2 new
Seedtag is a Madrid advertising technology company founded in 2014 by two former Google employees. Its contextual advertising engine reads the meaning of articles and images to place ads without using personal identifiers. The company operates across Europe and the Americas and is a reference in cookieless advertising.
≈ $59k – $121k per year (Estimated) · Senior · Madrid · Barcelona · Hamburg · London · Milan · Remote (Germany, France, United Kingdom, Belgium, Italy) · Full-Time · Senior
roller.lv · HQ: Melbourne, Australia · POS Systems · Ticketing · 201-500 employees · Likely startup · Trust B · Hiring 17
HQ: Melbourne, Australia · POS Systems · Ticketing · 201-500 employees · Likely startup · Trust B · Hiring 17
ROLLER is a venue management platform built for the attractions and leisure industry that powers ticketing, point of sale, memberships and guest experience for more than 3500 venues. It has raised 110 million dollars in funding and employs over 300 people, with offices in London, Austin, Melbourne and Sydney. The company is headquartered in Melbourne, Australia.
flowengineering.com · HQ: San Francisco, United States · CAD, PLM & BIM Software · Manufacturing & Industrial Software · 501-1000 employees · Startup · Trust B · Hiring 35
HQ: San Francisco, United States · CAD, PLM & BIM Software · Manufacturing & Industrial Software · 501-1000 employees · Startup · Trust B · Hiring 35
Flow Engineering develops Flow, a requirements management and verification platform for hardware engineering teams that links requirements, CAD, simulation, code and test data in one living systems graph, with AI agents that propagate changes and run impact analysis. Its customers are aerospace, defense, automotive and hardware companies, and it has announced a three-year strategic partnership with Rivian and Volkswagen Group Technologies. Based in San Francisco with staff in London, Los Angeles, Austin and Washington, it hires software and infrastructure engineers, forward deployed engineers, solutions architects, account executives, deployment strategists and growth marketers.
depop.com · HQ: London, United Kingdom · Marketplaces · Secondhand · 501-1000 employees · Est. 2011 · Trust B · Hiring 23, 4 new
HQ: London, United Kingdom · Marketplaces · Secondhand · 501-1000 employees · Est. 2011 · Trust B · Hiring 23, 4 new
Depop is a London company founded in 2011 that runs a social marketplace for second hand fashion. Its app blends resale listings with a feed and follower model that suits younger sellers building personal brands. The company was acquired by Etsy and continues to operate from London with millions of active users.
palantir.com · HQ: Denver, United States · Defense AI · Data Integration & ETL Tools · Decision Intelligence · 1001-5000 employees · Est. 2003 · NASDAQ: PLTR · Trust C · Hiring 234, 5 new
HQ: Denver, United States · Defense AI · Data Integration & ETL Tools · Decision Intelligence · 1001-5000 employees · Est. 2003 · NASDAQ: PLTR · Trust C · Hiring 234, 5 new
Palantir Technologies is an American software company founded in 2003 that builds platforms for integrating, analysing and acting on large and fragmented datasets. Its Gotham platform serves defence, intelligence and law enforcement customers, Foundry brings the same data-operating model to commercial industries such as manufacturing, healthcare and energy, and the Artificial Intelligence Platform layers large language models over both. Headquartered in Denver, Colorado and listed on the New York Stock Exchange since 2020, the company is known for deploying forward engineers directly inside customer organisations.
createfuture.com · HQ: Edinburgh, United Kingdom · AI Consulting & Integration · IT Consulting & Digital Transformation · Custom Software Development · 501-1000 employees · Est. 2010 · IT services · Trust A · Hiring 37, 3 new
HQ: Edinburgh, United Kingdom · AI Consulting & Integration · IT Consulting & Digital Transformation · Custom Software Development · 501-1000 employees · Est. 2010 · IT services · Trust A · Hiring 37, 3 new
CreateFuture is an AI transformation and software engineering partner that builds digital products, platforms, and AI-native solutions for enterprise clients. Headquartered in Edinburgh, Scotland, the company assists organizations across sectors like fintech, energy, and government in modernizing legacy technology and scaling intelligent workflows. Its services span business strategy, cloud infrastructure, customer experience design, and data engineering to drive digital growth.
cityscience.com · HQ: Exeter, United Kingdom · Engineering Services · 51-200 employees · Est. 2015 · Hiring 2
HQ: Exeter, United Kingdom · Engineering Services · 51-200 employees · Est. 2015 · Hiring 2
Carbon first engineering We help clients who are committed to decarbonisation achieve meaningful and quantifiable carbon reductions quickly and efficiently Contact us now City Science is the first engineering company dedicated to decarbonisation.
red-badger.com · HQ: London, United Kingdom · UI/UX Design · IT Consulting & Digital Transformation · Custom Software Development · 201-500 employees · Est. 2010 · IT services · Trust B · Hiring 27
HQ: London, United Kingdom · UI/UX Design · IT Consulting & Digital Transformation · Custom Software Development · 201-500 employees · Est. 2010 · IT services · Trust B · Hiring 27
Red Badger is a digital product consultancy that designs and builds software products, web platforms and mobile apps for large enterprises, offering product strategy, user experience design, software engineering and platform delivery. Its clients include banks, retailers and media groups, and it runs delivery teams in the United Kingdom, South Africa and New Zealand. The company is headquartered in London, England, United Kingdom.
bloomon is a flower subscription company built on its own supply chain and logistics software. By shipping directly from growers it cuts several days out of the traditional flower trade. The company is headquartered in Amsterdam and operates across North-West Europe.
baesystems.com · HQ: London, United Kingdom · Naval Systems · Combat Aircraft · Defense Manufacturing · 1001-5000 employees · Est. 1999 · Trust A · Hiring 287, 50 new
HQ: London, United Kingdom · Naval Systems · Combat Aircraft · Defense Manufacturing · 1001-5000 employees · Est. 1999 · Trust A · Hiring 287, 50 new
BAE Systems is a British multinational defence, security and aerospace company headquartered in London, building combat aircraft, warships, submarines, land vehicles, electronic systems and cyber and intelligence products. Formed in 1999 from the merger of British Aerospace and Marconi Electronic Systems, it is listed on the London Stock Exchange and has major operations in the UK, the US, Australia, Saudi Arabia and Qatar, and works on the Edgewing combat air programme. It hires hardware, software, structures, flight systems and spacecraft engineers, test and manufacturing specialists, project managers, supply chain and procurement staff, and graduates.
marksandspencer.com · HQ: London, United Kingdom · Home Decor · Apparel & Fashion Brands · Online Groceries · 1001-5000 employees · Est. 1884 · Trust A · Hiring 141, 9 new
HQ: London, United Kingdom · Home Decor · Apparel & Fashion Brands · Online Groceries · 1001-5000 employees · Est. 1884 · Trust A · Hiring 141, 9 new
Marks & Spencer is a British retailer selling clothing, lingerie, beauty products, home furnishings and food through hundreds of stores in the United Kingdom, an international franchise network and its online shop. Its food business sells own-brand groceries and prepared meals, and it owns a stake in the online grocer Ocado Retail. The company was founded in 1884. The company is headquartered in London, England, United Kingdom.
toogoodtogo.com · HQ: Copenhagen, Denmark · Food Technology · Marketplaces · 1001-5000 employees · Est. 2015 · Trust A · Hiring 54, 9 new
HQ: Copenhagen, Denmark · Food Technology · Marketplaces · 1001-5000 employees · Est. 2015 · Trust A · Hiring 54, 9 new
Too Good To Go is a Danish technology company headquartered in Copenhagen that runs a mobile marketplace where shops, bakeries, supermarkets and restaurants sell surplus food at a discount instead of throwing it away. Founded in 2015, the company has grown across Europe, North America, Australia and Japan, with teams in London, Paris, Warsaw, Toronto, New York, Austin, Melbourne and Tokyo working with retail chains and local stores. It hires sales specialists, key account and enterprise account managers, customer success and customer experience staff, data platform and backend engineers, product managers, SEO specialists and country directors.
3ds.com · HQ: Vélizy-Villacoublay, France · Clinical Trial Software · Manufacturing & Industrial Software · Simulation & Digital Twin Software · CAD, PLM & BIM Software · 5000+ employees · Est. 1981 · Trust B · Hiring 560, 20 new
HQ: Vélizy-Villacoublay, France · Clinical Trial Software · Manufacturing & Industrial Software · Simulation & Digital Twin Software · CAD, PLM & BIM Software · 5000+ employees · Est. 1981 · Trust B · Hiring 560, 20 new
Dassault Systemes is a French software company founded in 1981 as a spin-off from the aircraft maker Dassault Aviation, created to commercialise the three-dimensional design tools its engineers had built in house. It sells the CATIA and SOLIDWORKS design suites, SIMULIA simulation, ENOVIA lifecycle management and DELMIA manufacturing planning, all now delivered through the 3DEXPERIENCE platform that treats a product as one connected model from concept to service. The group has extended the same virtual twin idea into life sciences through the Medidata clinical trial platform and into urban and healthcare simulation, and it is headquartered in Velizy-Villacoublay near Paris.
bloomandwild.com · HQ: London, United Kingdom · Flowers & Florists · Est. 2013 · Hiring 3
HQ: London, United Kingdom · Flowers & Florists · Est. 2013 · Hiring 3
Bloom & Wild is a London direct-to-consumer company founded in 2013 that redesigned flower delivery around a letterbox-sized package. It built its own ordering, forecasting and fulfilment technology to manage a perishable product with sharp demand peaks around gifting occasions. The company has expanded across several European markets and acquired local competitors.
bcg.com · HQ: Boston, United States · IT Consulting & Digital Transformation · Analytics & BI Consulting · AI Consulting & Integration · Management Consulting · 1001-5000 employees · Est. 1963 · Trust A · Hiring 578, 69 new
HQ: Boston, United States · IT Consulting & Digital Transformation · Analytics & BI Consulting · AI Consulting & Integration · Management Consulting · 1001-5000 employees · Est. 1963 · Trust A · Hiring 578, 69 new
Boston Consulting Group (BCG) is an American management consulting firm headquartered in Boston, Massachusetts, founded in 1963 by Bruce Henderson. It advises corporations, governments and nonprofits on strategy, operations, digital and AI transformation, and runs units such as BCG X for technology build and design. The privately held firm operates more than 100 offices in about 50 countries.
openai.com · HQ: San Francisco, United States · Code Intelligence · Conversational AI · AI Research Labs · Foundation Models · LLM & Generative AI · 5000+ employees · Est. 2015 · Trust B · Hiring 788, 50 new
HQ: San Francisco, United States · Code Intelligence · Conversational AI · AI Research Labs · Foundation Models · LLM & Generative AI · 5000+ employees · Est. 2015 · Trust B · Hiring 788, 50 new
OpenAI is an American artificial intelligence research and deployment company founded in 2015 with the mission of ensuring that artificial general intelligence benefits all of humanity. It develops the GPT family of large language models and turns them into consumer and developer products, including the ChatGPT assistant, the Sora video model, the Codex coding agent and a commercial API used by millions of developers. Structured as a public benefit corporation controlled by a non-profit foundation, the company is backed by Microsoft and SoftBank and operates from San Francisco.
