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.
fiverings.com • HQ: New York, United States • Hedge Funds & Alternative Investments • Trust D • Hiring 10
HQ: New York, United States • Hedge Funds & Alternative Investments • Trust D • Hiring 10
Five Rings is a proprietary trading firm that combines strategy, innovation and technology to trade in domestic and international markets. It has offices in New York, Boca Raton, London and Amsterdam, and its job ads cover quantitative traders, quantitative researchers, software developers and trading operations engineers. The firm is headquartered in New York, United States.
vercel.com • HQ: San Francisco, United States • Developer Tools • Cloud Platforms (IaaS & PaaS) • 501-1000 employees • Est. 2015 • Startup • Trust B • Hiring 95, 6 new
HQ: San Francisco, United States • Developer Tools • Cloud Platforms (IaaS & PaaS) • 501-1000 employees • Est. 2015 • Startup • Trust B • Hiring 95, 6 new
Vercel is an American company founded in 2015 that operates a deployment platform for web applications and maintains Next.js, the React framework used by a very large share of professionally built websites. Its commercial position rests on that combination: the framework is free and enormously popular, and the platform is where its features work with no configuration, which converts open source adoption into hosting revenue. Headquartered in San Francisco and valued in the billions, it has extended into edge compute, observability and an artificial intelligence software development kit widely used to build model-powered applications.
aion.io • HQ: San Francisco, United States • AI Consulting & Integration • AI Development Tools • AI Agents • 201-500 employees • Est. 2025 • Trust A • Hiring 10
HQ: San Francisco, United States • AI Consulting & Integration • AI Development Tools • AI Agents • 201-500 employees • Est. 2025 • Trust A • Hiring 10
Aion is an enterprise artificial intelligence company headquartered in San Francisco, California, and founded in 2025 by Jayden Watson and Christian Angermayer. The company offers a platform for building, fine tuning, and deploying AI systems and agents in production, sold together with forward deployed engineers who implement it inside the customer organization. It runs teams across the United States, the United Kingdom, and India, targeting enterprises that want working AI systems rather than pilots.
hudsonrivertrading.com • HQ: New York, United States • Financial Services • Hedge Funds & Alternative Investments • 1001-5000 employees • Est. 2002 • Trust B • Hiring 79, 4 new
HQ: New York, United States • Financial Services • Hedge Funds & Alternative Investments • 1001-5000 employees • Est. 2002 • Trust B • Hiring 79, 4 new
Hudson River Trading is a New York quantitative trading firm that uses automated, research-driven strategies to trade equities, futures, options, currencies and other instruments on markets around the world. Founded in 2002, it builds its own low-latency trading systems, FPGA and ASIC hardware and machine learning models through its HRT AI Labs team, and has offices in cities including London, Chicago, Singapore, Austin, Boulder and Seattle. It hires software, hardware and design verification engineers, AI researchers, data scientists, network architects, electronic trading support engineers, tax, treasury and accounting specialists and interns.
dtcc.com • HQ: New York, United States • Custody & Fund Administration • Stock Exchanges & Market Infrastructure • 1001-5000 employees • Est. 1999 • Trust B • Hiring 316, 32 new
HQ: New York, United States • Custody & Fund Administration • Stock Exchanges & Market Infrastructure • 1001-5000 employees • Est. 1999 • Trust B • Hiring 316, 32 new
Headquartered in New York City, The Depository Trust & Clearing Corporation (DTCC) is a financial market infrastructure enterprise specializing in post-trade clearing, settlement, and asset custody services. Through its primary operating subsidiaries - including the Depository Trust Company (DTC), National Securities Clearing Corporation (NSCC), and Fixed Income Clearing Corporation (FICC) - the organization automates transaction processing, manages central counterparty risk, and maintains asset servicing across global equities, fixed income, and derivatives markets.
harmonic.security • HQ: London, United Kingdom • Information Security • AI Governance & Compliance • Cybersecurity AI • Data Loss Prevention • 51-200 employees • Est. 2023 • Startup • Hiring 11
HQ: London, United Kingdom • Information Security • AI Governance & Compliance • Cybersecurity AI • Data Loss Prevention • 51-200 employees • Est. 2023 • Startup • Hiring 11
Harmonic Security prevents employees from pasting sensitive data into public generative artificial intelligence tools. Founded in 2023 in London, it classifies content with its own models rather than brittle regular expression rules. The product gives security teams visibility into which assistants staff actually use.
samsara.com • HQ: San Francisco, United States • Industrial IoT (IIoT) • IoT Platforms & Solutions • Fleet Management • 1001-5000 employees • Est. 2015 • NYSE: IOT • Trust B • Hiring 277, 40 new
HQ: San Francisco, United States • Industrial IoT (IIoT) • IoT Platforms & Solutions • Fleet Management • 1001-5000 employees • Est. 2015 • NYSE: IOT • Trust B • Hiring 277, 40 new
Samsara is an American industrial internet of things company that sells a connected operations cloud for fleets and physical operations. Its vehicle gateways, AI dash cams, asset trackers and equipment sensors feed software for telematics, driver safety, compliance and electronic logging, routing, maintenance and site monitoring, used by transportation, construction, field services, utilities, public sector and manufacturing customers. Founded in 2015 and listed on the New York Stock Exchange, it is headquartered in San Francisco, California, United States.
monexglobal.com • HQ: London, United Kingdom • Payment Processing & Gateways • Currency Exchange & FX Payments • 501-1000 employees • Trust A • Hiring 30, 2 new
HQ: London, United Kingdom • Payment Processing & Gateways • Currency Exchange & FX Payments • 501-1000 employees • Trust A • Hiring 30, 2 new
Monex is a global financial solutions provider specialising in foreign exchange risk management and international payments for corporate and institutional clients. It has offices in Europe, North America and Asia and hires FX sales executives, options dealers and product managers. The company is headquartered in London, United Kingdom.
hived.space • HQ: London, United Kingdom • Transportation & Logistics • Delivery • 201-500 employees • Est. 2021 • Startup • Hiring 19, 3 new
HQ: London, United Kingdom • Transportation & Logistics • Delivery • 201-500 employees • Est. 2021 • Startup • Hiring 19, 3 new
Hived is a London logistics company founded in 2021 that runs an all-electric parcel delivery network. It operates its own vehicles and routing software rather than subcontracting to self-employed drivers, which gives it control over service quality and emissions. The company delivers for online retailers across London and the south east.
causaly.com • HQ: London, United Kingdom • Bioinformatics • Drug Discovery AI • Knowledge Graphs • 51-200 employees • Est. 2018 • Startup • Hiring 6
HQ: London, United Kingdom • Bioinformatics • Drug Discovery AI • Knowledge Graphs • 51-200 employees • Est. 2018 • Startup • Hiring 6
Causaly is the fastest way to find evidence, explore hidden connections and make new predictions in biomedical science. The company provides AI-powered software for reading medical information.
chain.link • HQ: San Francisco, United States • Financial Services • Blockchain & Crypto • Blockchain Infrastructure • 11-50 employees • Est. 2017 • Startup • Trust B • Hiring 12, 1 new
HQ: San Francisco, United States • Financial Services • Blockchain & Crypto • Blockchain Infrastructure • 11-50 employees • Est. 2017 • Startup • Trust B • Hiring 12, 1 new
Chainlink is a decentralised oracle network launched in 2017 that delivers external data and off-chain computation to smart contracts. Its price feeds underpin a large share of decentralised lending and derivatives markets, and it also provides cross-chain messaging and proof-of-reserve services. Development is led by Chainlink Labs, which works with banks and market infrastructure providers on tokenised asset pilots.
nice.com • HQ: Ra'anana, Israel • AI Agents • Fraud Detection • RegTech, AML & Compliance • Contact Center Software • 5000+ employees • Est. 1986 • Trust A • Hiring 182, 27 new
HQ: Ra'anana, Israel • AI Agents • Fraud Detection • RegTech, AML & Compliance • Contact Center Software • 5000+ employees • Est. 1986 • Trust A • Hiring 182, 27 new
NICE is an Israeli software company founded in 1986 that sells customer engagement and financial crime software to large enterprises. Its CXone platform runs contact centre operations in the cloud, covering routing, workforce management, quality monitoring, conversational analytics and increasingly autonomous agents that handle interactions without a human, while a separate division supplies anti-money-laundering, fraud detection and trade surveillance systems to financial institutions. Headquartered in Ra'anana and listed on both Nasdaq and the Tel Aviv exchange, it holds a leading share of the cloud contact centre market.
granola.ai • HQ: London, United Kingdom • LLM & Generative AI • Office & Productivity Software • 201-500 employees • Est. 2023 • Startup • Trust C • Hiring 22, 1 new
HQ: London, United Kingdom • LLM & Generative AI • Office & Productivity Software • 201-500 employees • Est. 2023 • Startup • Trust C • Hiring 22, 1 new
Granola is a software company that makes an AI notepad for meetings, which transcribes calls without a bot joining and combines the transcript with the user's own notes into structured summaries. It has grown into a shared team workspace used by companies such as Vercel, Cursor, Lovable and Decagon, and it hires tech ops, sales development, design engineering and strategic finance staff in London and San Francisco. The company is headquartered in London, England, United Kingdom.
quantcast.com • HQ: San Francisco, United States • Digital Marketing • Media & Audience Measurement • Advertising • Est. 2006 • Hiring 16, 2 new
HQ: San Francisco, United States • Digital Marketing • Media & Audience Measurement • Advertising • Est. 2006 • Hiring 16, 2 new
Quantcast is an advertising technology company headquartered in San Francisco, California, and founded in 2006. The company runs a demand side platform and audience measurement service that uses machine learning on live web activity to plan, buy, and target programmatic advertising. It also operates a widely deployed consent management platform and works with brands, agencies, and publishers across North America, Europe, and Asia Pacific.
remitly.com • HQ: Seattle, United States • Financial Services • Payment Processing & Gateways • Money Transfer & Remittances • 1001-5000 employees • Est. 2011 • Trust A • Hiring 147, 21 new
HQ: Seattle, United States • Financial Services • Payment Processing & Gateways • Money Transfer & Remittances • 1001-5000 employees • Est. 2011 • Trust A • Hiring 147, 21 new
Remitly is an American company founded in Seattle in 2011 that specialises in cross-border remittances sent by migrants to family in their home countries, a market long dominated by cash agent networks charging high fees. Its mobile-first service pays out to bank accounts, mobile wallets and cash pickup locations across more than one hundred and seventy countries, and it competes on transparent pricing, delivery speed and the reliability of the last mile rather than on branch coverage. Headquartered in Seattle and listed on Nasdaq, it has expanded into multi-currency accounts and financial products aimed at the same customers.
teamviewer.com • HQ: Göppingen, Germany • AR & VR Software • RMM & MSP Software • 1001-5000 employees • Est. 2005 • Trust A • Hiring 157, 14 new
HQ: Göppingen, Germany • AR & VR Software • RMM & MSP Software • 1001-5000 employees • Est. 2005 • Trust A • Hiring 157, 14 new
TeamViewer is a company founded in 2005 in Göppingen whose remote access software is installed on billions of devices. Its platform lets support teams control computers and machines anywhere, and it has expanded into augmented reality assistance for frontline workers. The company is listed in Frankfurt and serves customers in more than a hundred countries.
partly.com • HQ: Christchurch, New Zealand • Supply Chain & Logistics Software • B2B Commerce • Automotive Software • 51-200 employees • Est. 2020 • Startup • Trust B • Hiring 34, 1 new
HQ: Christchurch, New Zealand • Supply Chain & Logistics Software • B2B Commerce • Automotive Software • 51-200 employees • Est. 2020 • Startup • Trust B • Hiring 34, 1 new
Partly is an automotive software company that builds data and commerce infrastructure for the vehicle parts supply chain. Its platform maps parts catalogues to vehicles and connects collision repairers, workshops, parts distributors and manufacturers so that they can identify, price and order the correct parts with less manual work. The company operates in New Zealand, Australia, the United States and the United Kingdom and is headquartered in Christchurch, New Zealand.
flowtraders.com • HQ: Amsterdam, Netherlands • Stock Exchanges & Market Infrastructure • Hedge Funds & Alternative Investments • 201-500 employees • Est. 2004 • Trust A • Hiring 42, 3 new
HQ: Amsterdam, Netherlands • Stock Exchanges & Market Infrastructure • Hedge Funds & Alternative Investments • 201-500 employees • Est. 2004 • Trust A • Hiring 42, 3 new
Flow Traders is a Dutch trading firm founded in 2004 and listed on Euronext Amsterdam. It specialises in exchange traded products and builds its own pricing, risk and execution technology. The company is one of the largest liquidity providers in European exchange traded funds.
orbital.com • HQ: London, United Kingdom • Document AI • Legal AI • PropTech • 1001-5000 employees • Est. 2018 • Trust A • Hiring 13
HQ: London, United Kingdom • Document AI • Legal AI • PropTech • 1001-5000 employees • Est. 2018 • Trust A • Hiring 13
Orbital is a legal technology company headquartered in London, United Kingdom, and founded in 2018 as Orbital Witness by Will Pearce and Ed Boulle. The company builds Orbital Copilot, an AI agent that reads title deeds, leases, and survey documents and drafts the reports and objection letters real estate lawyers produce during property diligence. It sells to law firms and property businesses in the United Kingdom and the United States, aiming to cut the manual review time in commercial transactions.
