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.
waracle.com · HQ: London, United Kingdom · UI/UX Design · Digital Design · Digital Goods · Mobile App Development Services · Custom Software Development · Startup · Trust B · Hiring 16
HQ: London, United Kingdom · UI/UX Design · Digital Design · Digital Goods · Mobile App Development Services · Custom Software Development · Startup · Trust B · Hiring 16
Waracle design and engineer digital products. Our people really care about your business. We collaborate to create digital product experiences that scale.
jetbrains.com · HQ: Prague, Czech Republic · Project & Work Management Software · Developer Tools · 1001-5000 employees · Est. 2000 · Trust A · Hiring 41, 2 new
HQ: Prague, Czech Republic · Project & Work Management Software · Developer Tools · 1001-5000 employees · Est. 2000 · Trust A · Hiring 41, 2 new
JetBrains is a software company founded in 2000 that builds integrated development environments and team tools for professional programmers. Its IDE family covers most major languages, including IntelliJ IDEA for the Java virtual machine, PyCharm, WebStorm, GoLand, CLion and Rider, all sharing a code-intelligence engine that gave the company its reputation for refactoring and static analysis. Headquartered in Prague with development offices across Europe, it also created the Kotlin programming language, now Google's preferred language for Android, and ships team products such as TeamCity, YouTrack and its AI coding assistants.
virginactive.co.uk · HQ: London, United Kingdom · Fitness · 1001-5000 employees · Est. 1999 · Hiring 123, 10 new
HQ: London, United Kingdom · Fitness · 1001-5000 employees · Est. 1999 · Hiring 123, 10 new
Virgin Active is a health club operator headquartered in London that runs gyms with pools, spas, studios and tennis and padel courts, and is repositioning its UK estate as social wellness clubs with classes, recovery, nutrition and family programmes. This record covers the UK business, with clubs in London such as Moorgate, Clapham and Mayfair as well as Northampton, Nottingham, Sheffield, Solihull, Bromley and Salford Quays, while the wider group also operates in Italy, South Africa, Australia, Thailand and Singapore. It hires member journey and sales hosts, personal trainers, group exercise and swim instructors, lifeguards, childcare staff, duty managers, Kauai food staff and engineers.
praktika.ai · HQ: London, United Kingdom · E-learning · Language Learning · 51-200 employees · Est. 2022 · Startup · Hiring 4
HQ: London, United Kingdom · E-learning · Language Learning · 51-200 employees · Est. 2022 · Startup · Hiring 4
Praktika teaches languages through conversations with animated artificial intelligence avatars that give instant feedback. Founded in 2022 with Ukrainian founders and a London base, it grew rapidly on mobile app stores. Its avatars are designed to lower the anxiety of speaking practice with a human tutor.
thrivecart.dev · HQ: London, United Kingdom · Learning Management Systems · E-commerce Platforms · 5000+ employees · Est. 2023 · Hiring 3
HQ: London, United Kingdom · Learning Management Systems · E-commerce Platforms · 5000+ employees · Est. 2023 · Hiring 3
ThriveCart is a platform used by more than 50,000 people to generate over 5 billion dollars in sales, serving creators, coaches, consultants and other businesses. It includes cart and checkout functionality, affiliate management and a learning management system, and it hires engineers, marketers and a payments product manager. The company is headquartered in London, United Kingdom.
darktrace.com · HQ: Cambridge, United Kingdom · Email Security · Network Security · Security Operations · Cybersecurity AI · 1001-5000 employees · Est. 2013 · Trust B · Hiring 70, 11 new
HQ: Cambridge, United Kingdom · Email Security · Network Security · Security Operations · Cybersecurity AI · 1001-5000 employees · Est. 2013 · Trust B · Hiring 70, 11 new
Darktrace is a British cybersecurity company founded in Cambridge in 2013 by mathematicians and former government intelligence staff, built on the idea that a network can be defended by learning its own normal behaviour rather than matching known attack signatures. Its Self-Learning AI builds a live model of how each user, device and workload usually behaves, flags deviations that no signature would catch, and can act autonomously to contain an intrusion in progress. The company listed in London in 2021 and was taken private by Thoma Bravo in 2024 for around five billion dollars, and it protects networks, email, cloud and operational technology for thousands of organisations.
relex.com.sg · London · LED Lighting & Luminaires · 1001-5000 employees · Hiring 1
London · LED Lighting & Luminaires · 1001-5000 employees · Hiring 1
Brands Set up in 1986, Relex Illumination Pte Ltd is one of the most establishedlighting company in Singapore. It was previously known as Relex Electric FE Pte Ltd andhas since changed its name to better reflect the activities of the company.
LMAX Group is a London trading technology company founded in 2010 that operates institutional exchanges for foreign exchange and digital assets. Its matching engine is known for deterministic low-latency execution and gave rise to the widely used Disruptor open source library. The company runs venues in London, New York, Tokyo and Singapore.
aalyria.com · HQ: Livermore, United States · Telecom Infrastructure · 201-500 employees · Startup · Trust A · Hiring 31
HQ: Livermore, United States · Telecom Infrastructure · 201-500 employees · Startup · Trust A · Hiring 31
Aalyria is a US technology company headquartered in Livermore, California that supplies laser communications hardware and software-defined networking platforms for networks in motion across land, sea, air and space. Built on technology acquired from Google, its Spacetime platform orchestrates satellite, airborne and terrestrial mesh networks and its Tightbeam product provides free-space optical links for commercial and government customers. It hires software engineers for backend, infrastructure, simulation and optimization systems, research scientists and related technical staff in California, Washington and London.
sega.com · HQ: Tokyo, Japan · PC Games · Console Games · 1001-5000 employees · Est. 1960 · Hiring 13, 1 new
HQ: Tokyo, Japan · PC Games · Console Games · 1001-5000 employees · Est. 1960 · Hiring 13, 1 new
SEGA is a Tokyo game company founded in 1960 that made arcade machines and home consoles before becoming a software publisher. It develops the Sonic, Yakuza and Persona franchises and owns studios in Japan and Europe including Atlus and Creative Assembly. The company continues to operate arcade and amusement machine businesses in Japan.
anthropic.com · HQ: San Francisco, United States · Code Intelligence · AI Research Labs · AI Safety & Alignment · Foundation Models · LLM & Generative AI · 1001-5000 employees · Est. 2021 · Trust B · Hiring 670, 35 new
HQ: San Francisco, United States · Code Intelligence · AI Research Labs · AI Safety & Alignment · Foundation Models · LLM & Generative AI · 1001-5000 employees · Est. 2021 · Trust B · Hiring 670, 35 new
Anthropic is an American artificial intelligence safety and research company founded in 2021 by former OpenAI researchers, among them the siblings Dario and Daniela Amodei. It develops the Claude family of large language models and ships them through a consumer assistant, an enterprise developer platform and the Claude Code agentic coding tool, alongside open standards such as the Model Context Protocol. Incorporated as a public benefit corporation and headquartered in San Francisco, the company concentrates on interpretability, alignment and reliability research and counts Google and Amazon among its largest investors.
enthuse.com · London · Nonprofit, Church & Membership Software · Nonprofits & Foundations · Est. 2012 · Hiring 5
London · Nonprofit, Church & Membership Software · Nonprofits & Foundations · Est. 2012 · Hiring 5
Enthuse is transforming digital fundraising by putting charities first. Enthuse is a donations, event registration and fundraising platform that has helped thousands of charities raise millions. Our solutions are customised under a cause’s own brand and we put charities in control of their data. This allows charities to build and nurture a loyal supporter base, raise more and ultimately have more impact. Founded in 2012 and headquartered in London, Enthuse is backed by socially responsible investors and was named “Most Committed Company to the Sector” at the National Fundraising Awards. See our careers page: https://enthuse.com/careers
jainglobal.com · HQ: New York, United States · Hedge Funds & Alternative Investments · 201-500 employees · Est. 2024 · Trust B · Hiring 32, 1 new
HQ: New York, United States · Hedge Funds & Alternative Investments · 201-500 employees · Est. 2024 · Trust B · Hiring 32, 1 new
Jain Global is a global multi-strategy hedge fund and investment management firm. It runs an integrated structure of several investment businesses covering fundamental equities, macro, credit, commodities and quantitative strategies, seeking returns uncorrelated with broad markets. Jain Global was founded by Bobby Jain, formerly co-chief investment officer of Millennium Management, and launched in 2024 as one of the largest hedge fund debuts on record.
solirius.com · HQ: London, United Kingdom · IT Consulting & Digital Transformation · Management Consulting · 51-200 employees · Trust A · Hiring 35, 1 new
HQ: London, United Kingdom · IT Consulting & Digital Transformation · Management Consulting · 51-200 employees · Trust A · Hiring 35, 1 new
Top of page About us We help our clients deliver transformational growth through innovative technology solutions and people-centred services. OUR APPROACH For us, it’s all about people.
gradient-labs.ai · HQ: London, United Kingdom · AI Agents · Financial Software & Embedded Finance · Financial AI · 51-200 employees · Est. 2023 · Startup · Hiring 7
HQ: London, United Kingdom · AI Agents · Financial Software & Embedded Finance · Financial AI · 51-200 employees · Est. 2023 · Startup · Hiring 7
Gradient Labs builds AI agents for financial services. Automate disputes, KYC, lending, customer support, and the back-office work in between. Book a demo.
thanksben.com · HQ: London, United Kingdom · Health Insurance & Benefits · Human Resources · 11-50 employees · Est. 2019 · Startup · Hiring 4
HQ: London, United Kingdom · Health Insurance & Benefits · Human Resources · 11-50 employees · Est. 2019 · Startup · Hiring 4
Ben is a London employee benefits company founded in 2019 that gives staff a flexible allowance on a payment card. Its platform lets employees choose how to spend benefit budgets while the employer keeps reporting and tax handling automated. The company serves international workforces where a single benefits package rarely fits everyone.
together.ai · HQ: San Francisco, United States · Foundation Models · Cloud Platforms (IaaS & PaaS) · AI Compute & Inference · 501-1000 employees · Est. 2022 · Startup · Trust A · Hiring 87, 5 new
HQ: San Francisco, United States · Foundation Models · Cloud Platforms (IaaS & PaaS) · AI Compute & Inference · 501-1000 employees · Est. 2022 · Startup · Trust A · Hiring 87, 5 new
Together AI (Together Computer, Inc.) is a full-stack AI infrastructure and cloud platform headquartered in San Francisco, California. Founded in 2022 by prominent AI researchers and system engineers - including CEO Vipul Ved Prakash, CTO Ce Zhang, Chief Scientist Tri Dao (co-creator of FlashAttention), Chris Ré, and Percy Liang - the company operates as an "AI Native Cloud" designed to train, fine-tune, and deploy open-source generative AI models at scale with high performance and optimized unit economics.
