Backend Developer jobs in London hiring now at vetted startups and product companies on Alion, updated daily. Average salary around $213,465/year. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.
asos.com · HQ: London, United Kingdom · Cosmetics & Makeup · E-commerce Platforms · Apparel & Fashion Brands · 201-500 employees · Est. 2000 · Trust B · Hiring 50, 7 new
HQ: London, United Kingdom · Cosmetics & Makeup · E-commerce Platforms · Apparel & Fashion Brands · 201-500 employees · Est. 2000 · Trust B · Hiring 50, 7 new
ASOS is a major British online fast-fashion and cosmetics retailer targeted primarily at young adult consumers. Founded in London in 2000, the e-commerce giant curates a selection of over 850 partner brands alongside its proprietary fashion labels, including ASOS Design and Topshop. Operating through localized digital storefronts and global distribution hubs, the company fulfills orders for millions of active customers across more than 150 countries.
ourfuturehealth.org.uk · HQ: Salford, United Kingdom · Research Institutes · Public Health & Prevention · 5000+ employees · Est. 2019 · Trust A · Hiring 20, 6 new
HQ: Salford, United Kingdom · Research Institutes · Public Health & Prevention · 5000+ employees · Est. 2019 · Trust A · Hiring 20, 6 new
This UK charity runs a large population health research programme that recruits millions of adult volunteers to share health data, blood samples and questionnaires. Researchers use the resulting dataset to study earlier detection, prevention and treatment of diseases such as dementia, cancer, diabetes and heart disease. The organisation is headquartered in Salford, England, United Kingdom.
starlingbank.com · HQ: London, United Kingdom · Commercial & Retail Banks · Financial Software & Embedded Finance · Digital Banks & Neobanks · 1001-5000 employees · Est. 2014 · Trust A · Hiring 48, 12 new
HQ: London, United Kingdom · Commercial & Retail Banks · Financial Software & Embedded Finance · Digital Banks & Neobanks · 1001-5000 employees · Est. 2014 · Trust A · Hiring 48, 12 new
Starling Bank is a British digital bank headquartered in London that offers personal, joint, business, multi-currency and children's accounts through a mobile app, with no branches and its own proprietary banking platform. Founded in 2014 by Anne Boden, it serves more than four million accounts from offices in London, Cardiff, Southampton and Manchester and licenses its technology to other banks as the software-as-a-service business Engine by Starling. It hires software, infrastructure, cloud security and mobile engineers, security architects and penetration testers, finance and legal professionals, and customer service team leads.
genomicsengland.co.uk · HQ: London, United Kingdom · Research Institutes · Genomics & Genetic Testing · 201-500 employees · Est. 2013 · Startup · Hiring 5, 3 new
HQ: London, United Kingdom · Research Institutes · Genomics & Genetic Testing · 201-500 employees · Est. 2013 · Startup · Hiring 5, 3 new
Genomics England is a global leader in genomic medicine and research, focused on creating a world where everyone benefits from genomic healthcare. The company supports the NHS’s national whole genome sequencing service and runs the National Genomic Research Library, aiming to integrate genomics into everyday healthcare by 2035.
lightdash.com · HQ: London, United Kingdom · Analytics & BI Consulting · BI & Dashboard Software · 51-200 employees · Est. 2021 · Startup · Hiring 3, 1 new
HQ: London, United Kingdom · Analytics & BI Consulting · BI & Dashboard Software · 51-200 employees · Est. 2021 · Startup · Hiring 3, 1 new
Lightdash is a London data company founded in 2021 that builds an open source business intelligence layer on top of dbt. Its approach keeps metric definitions in version-controlled code rather than in a separate dashboard tool, which prevents numbers drifting apart. The company serves data teams that already model their warehouse in dbt.
thoughtmachine.net · HQ: London, United Kingdom · Financial Software & Embedded Finance · 51-200 employees · Est. 2014 · Startup · Trust A · Hiring 30, 1 new
HQ: London, United Kingdom · Financial Software & Embedded Finance · 51-200 employees · Est. 2014 · Startup · Trust A · Hiring 30, 1 new
Thought Machine is a financial technology company that builds Vault Core, a cloud-native core banking platform, and Vault Payments, which banks use to replace legacy mainframe systems. Founded in 2014 by former Google engineer Paul Taylor, it works with retail and commercial banks in Europe, Asia-Pacific and the Americas and runs offices in London, Lisbon, Singapore, New York and Sydney. The company is headquartered in London, England, United Kingdom.
neo4j.com · HQ: San Mateo, United States · Knowledge Graphs · Databases & DBMS · Est. 2007 · Trust A · Hiring 54, 10 new
HQ: San Mateo, United States · Knowledge Graphs · Databases & DBMS · Est. 2007 · Trust A · Hiring 54, 10 new
Neo4j is a graph database company headquartered in San Mateo, California, that develops the Neo4j graph database, the Cypher query language and the AuraDB cloud service. Founded in 2007 in Malmö, Sweden, it sells to enterprises using graph data for fraud detection, recommendations, knowledge graphs and AI retrieval applications, and also maintains an open source community edition. It hires database kernel engineers, solution engineers, AI solutions architects and enterprise account executives, mainly in London, Malmö, New York and San Mateo.
Barclays is a British universal bank whose roots go back to a goldsmith banking partnership founded in London in 1690, and which took its modern joint-stock form in 1896 through the amalgamation of twenty family banks. It combines a large United Kingdom retail and business bank with an investment bank that competes with the American bulge bracket in fixed income and equities trading, an unusual pairing for a European institution. The group also runs Barclaycard, one of the largest card issuers in Britain, a United States consumer bank built on airline and retail partnerships, and a private banking and wealth arm.
margo.com · HQ: Courbevoie, France · IT Staffing & Staff Augmentation · IT Consulting & Digital Transformation · 11-50 employees · Est. 2005 · Staffing · EOR · Trust A · Hiring 48, 2 new
HQ: Courbevoie, France · IT Staffing & Staff Augmentation · IT Consulting & Digital Transformation · 11-50 employees · Est. 2005 · Staffing · EOR · Trust A · Hiring 48, 2 new
Margo is a Paris-based technology engineering and AI consulting group that provides specialist consultants in data, cloud, software engineering and capital markets technology, mainly to banks, insurers and industrial clients. Founded in 2005, it has about 450 staff across Paris, London and an engineering center in Warsaw, reported turnover of 45 million euros in 2025 and runs practices such as Capital Market Technologies, Cloud Transformation and Software Engineering. It hires C#, Java and Python developers, front-office support engineers, quant developers, business analysts, data and DevOps engineers and business developers.
yes.com · HQ: Birkirkara, Malta · iGaming & Gambling · Sports Betting · Est. 2024 · Startup · Hiring 2, 1 new
HQ: Birkirkara, Malta · iGaming & Gambling · Sports Betting · Est. 2024 · Startup · Hiring 2, 1 new
Yes.com is a Malta-based online gaming company building fair and responsible casino and sports betting products for regulated European markets. First launch in Denmark 2026.
investengine.com · HQ: London, United Kingdom · Central Banks & Financial Regulators · Financial Services · Investing Apps & Robo-Advisors · Likely startup · Hiring 16, 2 new
HQ: London, United Kingdom · Central Banks & Financial Regulators · Financial Services · Investing Apps & Robo-Advisors · Likely startup · Hiring 16, 2 new
InvestEngine brings unbeatable value and innovation to your investing. No buying and selling fees for 870+ exchange-traded funds from iShares, Vanguard and other leading brands. With powerful tools for automating, diversifying and analysing your portfolio. All you need to grow your wealth. Our portfolios are available in an ISA, General Account, or Business Account for companies — all with easy access and for a minimum investment of only £100.
lexisnexis.com · HQ: New York, United States · Legal AI · Legal Software · 5000+ employees · Est. 1973 · Trust B · Hiring 234, 16 new
HQ: New York, United States · Legal AI · Legal Software · 5000+ employees · Est. 1973 · Trust B · Hiring 234, 16 new
LexisNexis Legal and Professional is the legal information division of the RELX group, descended from the pioneering Lexis full-text legal search service launched in 1973. It sells case law and statutory research, practical guidance, drafting and analytics tools to law firms, corporate legal departments, courts and government bodies, and it has embedded generative assistants across those products under the Lexis+ AI name. Headquartered in New York with major operations in Ohio and North Carolina, it competes principally with Thomson Reuters and holds one of the two large English-language legal content archives.
salesforce.com · HQ: San Francisco, United States · AI Agents · Marketing Automation · Customer Support & Help Desk Software · BI & Dashboard Software · CRM Software · 5000+ employees · Est. 1999 · Trust B · Hiring 1395, 154 new
HQ: San Francisco, United States · AI Agents · Marketing Automation · Customer Support & Help Desk Software · BI & Dashboard Software · CRM Software · 5000+ employees · Est. 1999 · Trust B · Hiring 1395, 154 new
Salesforce is an American enterprise software company founded in 1999 that pioneered delivering business applications over the internet rather than as installed software. Its Customer 360 platform brings sales, service, marketing, commerce and analytics onto shared customer data, extended by the Slack collaboration suite, the Tableau analytics business and the MuleSoft integration layer. Headquartered in San Francisco, the company has moved its product strategy toward autonomous agents through Agentforce and the Data Cloud, and it remains the largest customer relationship management vendor in the world by revenue share.
dataart.com · HQ: New York, United States · IT Outsourcing & Dedicated Teams · Custom Software Development · 51-200 employees · Est. 1997 · IT services · Trust B · Hiring 124, 9 new
HQ: New York, United States · IT Outsourcing & Dedicated Teams · Custom Software Development · 51-200 employees · Est. 1997 · IT services · Trust B · Hiring 124, 9 new
DataArt is a global software engineering and consulting firm headquartered in New York that builds and modernises custom software, data platforms and cloud infrastructure for clients in finance, travel, healthcare, media and retail. Founded in 1997, it runs delivery centres across Europe, the Americas and Asia, including offices in Wroclaw, Lublin and Lodz in Poland and teams in India, and works with more than 400 enterprise clients. Its openings include senior .NET, Java, Python and frontend engineers, DevOps and site reliability engineers, data architects and data engineers, QA automation leads and solution consultants.
drw.com · HQ: Chicago, United States · Hedge Funds & Alternative Investments · 1001-5000 employees · Est. 1992 · Trust B · Hiring 152, 11 new
HQ: Chicago, United States · Hedge Funds & Alternative Investments · 1001-5000 employees · Est. 1992 · Trust B · Hiring 152, 11 new
DRW is a proprietary trading firm active across futures, options, fixed income and digital assets. It builds its own low-latency technology and quantitative research infrastructure. The firm also invests in real estate, venture and cryptocurrency ventures.
sees.ai · HQ: Chicago, United States · Drone AI · Drones & UAVs · 11-50 employees · Est. 2018 · Startup · Hiring 11, 2 new
HQ: Chicago, United States · Drone AI · Drones & UAVs · 11-50 employees · Est. 2018 · Startup · Hiring 11, 2 new
Sees.ai delivers highly autonomous BVLOS drone inspections for electricity grids, capturing consistent, high-quality asset condition data at national scale.
deliveroo.com · HQ: London, United Kingdom · Online Groceries · Marketplaces · Delivery · 1001-5000 employees · Est. 2013 · Trust A · Hiring 188, 19 new
HQ: London, United Kingdom · Online Groceries · Marketplaces · Delivery · 1001-5000 employees · Est. 2013 · Trust A · Hiring 188, 19 new
Deliveroo is a British online food delivery company headquartered in London, connecting customers with restaurants, grocers and retailers through its app and a network of courier partners. Founded in 2013 by Will Shu and Greg Orlowski, it operates in the UK, Ireland, France, Italy, Belgium, the United Arab Emirates, Kuwait and other markets, and it has been owned by DoorDash since October 2025, alongside Wolt. It hires software and machine learning engineers, marketing and merchant teams, account managers, payroll and compensation specialists, and onboarding and partner support staff.
