Backend Developer jobs in San Francisco hiring now at vetted startups and product companies on Alion, updated daily. Average salary around $276,456/year. Compare remote, hybrid and on-site positions with relocation and visa sponsorship. Browse and apply today.
snorkel.ai · HQ: Redwood City, United States · MLOps · Machine Learning · AI Training Data & Annotation · 501-1000 employees · Est. 2019 · Startup · Trust B · Hiring 42, 1 new
HQ: Redwood City, United States · MLOps · Machine Learning · AI Training Data & Annotation · 501-1000 employees · Est. 2019 · Startup · Trust B · Hiring 42, 1 new
Snorkel AI was founded in 2019 by Stanford researchers who developed programmatic labelling, where subject matter experts write rules that generate training data instead of annotating examples by hand. Its platform now covers data curation, model fine-tuning and expert evaluation for enterprise and frontier model builders. Banks, insurers and government agencies use it to specialise models on proprietary knowledge.
unity.com · HQ: San Francisco, United States · Advertising · AR & VR Software · Developer Tools · Game Development · 1001-5000 employees · Est. 2004 · Trust A · Hiring 131, 13 new
HQ: San Francisco, United States · Advertising · AR & VR Software · Developer Tools · Game Development · 1001-5000 employees · Est. 2004 · Trust A · Hiring 131, 13 new
Headquartered in San Francisco, California, Unity Software Inc. (Unity Technologies) is a technology enterprise specializing in real-time 3D (RT3D) content development software and engine solutions. The company provides an integrated platform that enables developers, creators, and engineers to build, run, and monetize interactive 2D, 3D, virtual reality (VR), and augmented reality (AR) experiences across mobile, console, PC, and spatial computing hardware. By combining cross-platform runtime engines with developer services, cloud tools, and advertising monetization networks, it serves as a core infrastructure provider for the global gaming industry as well as industrial sectors such as automotive, architecture, and film production.
amazon.com · HQ: Seattle, United States · Robotics AI · Logistics & Warehouse Robotics · Video Production · Developer Tools · Advertising · Logistics · Streaming & OTT Platforms · Cloud Platforms (IaaS & PaaS) · Marketplaces · 1-10 employees · Est. 1994 · Trust B · Hiring 15224, 1170 new
HQ: Seattle, United States · Robotics AI · Logistics & Warehouse Robotics · Video Production · Developer Tools · Advertising · Logistics · Streaming & OTT Platforms · Cloud Platforms (IaaS & PaaS) · Marketplaces · 1-10 employees · Est. 1994 · Trust B · Hiring 15224, 1170 new
Amazon is an American technology and retail conglomerate founded by Jeff Bezos in 1994 as an online bookstore and headquartered in Seattle, Washington. It operates the world's largest online marketplace together with a global logistics network, physical grocery stores and a third-party seller platform that accounts for most units sold. Amazon Web Services, launched in 2006, is the leading public cloud provider and generates the majority of the group's operating profit, while advertising, Prime Video, Alexa devices and Kuiper satellite broadband round out the business.
$165k – $224k per year · Equity · Middle · 5+ years exp · In office (Santa Clara, San Francisco, Seattle, United States) · Bachelor's Degree · Full-Time · Middle
$230k – $311k per year · Equity · Lead · 10+ years exp · In office (Seattle, San Francisco, Santa Clara, Arlington, Herndon, United States) · Master's Degree · Full-Time · Principal
speak.com · HQ: San Francisco, United States · Speech & Audio AI · Education AI · Language Learning · 51-200 employees · Est. 2016 · Startup · Trust B · Hiring 31, 1 new
HQ: San Francisco, United States · Speech & Audio AI · Education AI · Language Learning · 51-200 employees · Est. 2016 · Startup · Trust B · Hiring 31, 1 new
Speak is a language learning company founded in 2016 that focuses on spoken fluency rather than vocabulary drills. Its speech recognition and language models let learners hold open-ended conversations and receive detailed pronunciation and grammar feedback. The app became one of the largest education products in South Korea and has expanded globally with backing from the OpenAI Startup Fund.
conversion.com · HQ: London, United Kingdom · A/B Testing & Experimentation · E-commerce Marketing · 51-200 employees · Startup · Trust A · Hiring 15, 4 new
HQ: London, United Kingdom · A/B Testing & Experimentation · E-commerce Marketing · 51-200 employees · Startup · Trust A · Hiring 15, 4 new
Conversion (formerly Conversion Factory) is a data-driven conversion rate optimisation agency running experimentation programmes for clients from blue-chip companies to niche businesses. It uses A/B testing, research and analytics to increase online conversion, with offices in the United Kingdom and North America. The company is headquartered in London, United Kingdom.
patreon.com · HQ: San Francisco, United States · Creator & Fan Platforms · Content Creation · Est. 2013 · Startup · Trust B · Hiring 17, 1 new
HQ: San Francisco, United States · Creator & Fan Platforms · Content Creation · Est. 2013 · Startup · Trust B · Hiring 17, 1 new
Headquartered in San Francisco, California, Patreon is a membership and crowdfunding platform designed to help content creators, artists, and musicians earn recurring revenue from their fans. The company provides digital tools that enable creators to offer exclusive content, community access, and tiered subscription services. Additionally, it facilitates direct financial support and fan engagement, empowering independent creators to build sustainable businesses around their work.
juicebox.ai · HQ: San Francisco, United States · Recruiting Software & ATS · HR & Recruiting AI · 501-1000 employees · Est. 2023 · Startup · Trust A · Hiring 37, 2 new
HQ: San Francisco, United States · Recruiting Software & ATS · HR & Recruiting AI · 501-1000 employees · Est. 2023 · Startup · Trust A · Hiring 37, 2 new
Juicebox is an AI recruiting platform whose PeopleGPT search lets a hiring team describe the person they want in plain language instead of assembling boolean strings across several databases. It searches hundreds of millions of public profiles, verifies contact details and drafts the outreach, which collapses sourcing, enrichment and sequencing into a single workflow that one recruiter can run. The product is used by in-house talent teams and agencies hiring for technical, clinical and other specialised roles.
lila.ai · HQ: Cambridge, United States · Materials Science & Nanotechnology · Laboratory & Pharmaceutical Robotics · AI Research Labs · AI for Science · 201-500 employees · Est. 2023 · Startup · Trust A · Hiring 119, 15 new
HQ: Cambridge, United States · Materials Science & Nanotechnology · Laboratory & Pharmaceutical Robotics · AI Research Labs · AI for Science · 201-500 employees · Est. 2023 · Startup · Trust A · Hiring 119, 15 new
Lila Sciences is an American company launched publicly in 2025 out of Flagship Pioneering with the aim of building what it calls scientific superintelligence: artificial intelligence systems that generate hypotheses and then test them in the company's own automated laboratories. Its distinguishing feature is the closed loop between model and experiment, since most scientific machine learning is limited by the fact that the data it needs has never been generated. Headquartered in Cambridge, Massachusetts and funded at an unusually large scale for a company at this stage, it is working across life sciences and materials chemistry rather than committing to a single field.
Triangle powers businesses to embed Web3 experiences across DeFi, NFTs, payments, social, and many more by using the most powerful wallet infrastructure API.
ironcladapp.com · HQ: San Francisco, United States · Digital Signature · Document Management · Legal AI · Legal Software · 51-200 employees · Est. 2014 · Trust A · Hiring 27
HQ: San Francisco, United States · Digital Signature · Document Management · Legal AI · Legal Software · 51-200 employees · Est. 2014 · Trust A · Hiring 27
Ironclad is a contract lifecycle management software company headquartered in San Francisco, California, and founded in 2014. The company offers a digital contracting platform that automates the creation, negotiation, approval, signature, and storage of business agreements, with AI features for extracting and reviewing contract terms. It serves legal, sales, and procurement teams at enterprises and technology companies, and is backed by venture investors including Accel, Sequoia Capital, and Y Combinator.
rl-list.com · HQ: San Francisco, United States · Incident Response · Cybersecurity · Artificial Intelligence · 51-200 employees · Est. 2025 · Startup · Hiring 38, 7 new
HQ: San Francisco, United States · Incident Response · Cybersecurity · Artificial Intelligence · 51-200 employees · Est. 2025 · Startup · Hiring 38, 7 new
Compare 42 RL environment vendors by funding, team, customers, SOC 2 and focus area. A cited, first-pass procurement shortlist for 2026, built from public and vendor-shared data.
perplexity.ai · HQ: San Francisco, United States · Foundation Models · LLM & Generative AI · Search Engines · AI Search · 1001-5000 employees · Est. 2022 · Trust B · Hiring 137, 8 new
HQ: San Francisco, United States · Foundation Models · LLM & Generative AI · Search Engines · AI Search · 1001-5000 employees · Est. 2022 · Trust B · Hiring 137, 8 new
Perplexity AI is an American company that builds an answer engine combining live web search with large language models to return sourced, conversational responses instead of a list of links. Its products span a consumer assistant on web and mobile, the Comet browser, enterprise search over internal documents and the Sonar developer API that exposes the same grounded retrieval stack. Founded in 2022 in San Francisco by former researchers and engineers from OpenAI, Meta and Databricks, the company is backed by NVIDIA, IVP, New Enterprise Associates and SoftBank.
okta.com · HQ: San Francisco, United States · E-learning · Cybersecurity · Identity Management · 1001-5000 employees · Est. 2009 · Trust A · Hiring 365, 31 new
HQ: San Francisco, United States · E-learning · Cybersecurity · Identity Management · 1001-5000 employees · Est. 2009 · Trust A · Hiring 365, 31 new
Okta is an American identity company founded in 2009 that manages who can log in to what across an organisation's applications, and it built its position by being neutral between the cloud vendors rather than tied to any one of them. Its workforce identity products handle single sign-on, multi-factor authentication and lifecycle management for employees, while Auth0, acquired in 2021, provides the same capability for developers building customer-facing applications. Headquartered in San Francisco and listed on Nasdaq, it suffered a serious support-system breach in 2023 that put its own security practices under scrutiny in a category built entirely on trust.
workwhile.ai · HQ: San Francisco, United States · Recruiting & Staffing · 51-200 employees · Startup · Trust A · Hiring 9
HQ: San Francisco, United States · Recruiting & Staffing · 51-200 employees · Startup · Trust A · Hiring 9
WorkWhile is an AI-powered hourly labor platform and workforce marketplace headquartered in San Francisco, California. Founded in 2019 by Jarah Euston and Amol Jain, the venture was incubated at Khosla Ventures and has raised nearly $40 million from top investors including Rethink Impact, Khosla Ventures, Reach Capital, and Citi.
mercury.com · HQ: San Francisco, United States · Financial Software & Embedded Finance · Digital Banks & Neobanks · 501-1000 employees · Est. 2017 · Startup · Trust A · Hiring 71, 6 new
HQ: San Francisco, United States · Financial Software & Embedded Finance · Digital Banks & Neobanks · 501-1000 employees · Est. 2017 · Startup · Trust A · Hiring 71, 6 new
Mercury is an American financial technology company that provides business banking and financial operations software to startups and small and mid-sized companies. Its platform combines checking and savings accounts held through partner banks with corporate cards, bill pay, invoicing, treasury and accounting integrations, and it reports more than 200,000 business customers. Founded in 2017, it hires software engineers, data scientists, risk and fraud specialists and treasury operations staff. The company is headquartered in San Francisco, California, United States.
benchling.com · HQ: San Francisco, United States · Scientific & Lab Software · 201-500 employees · Est. 2012 · Trust A · Hiring 50, 5 new
HQ: San Francisco, United States · Scientific & Lab Software · 201-500 employees · Est. 2012 · Trust A · Hiring 50, 5 new
Benchling is a biotechnology software company headquartered in San Francisco, California, and founded in 2012. The company provides a cloud-based platform for research and development that includes tools for electronic lab notebooks, biological registration, inventory management, and workflow automation. Serving over 200,000 scientists across academic institutions, startups, and major biopharmaceutical firms, the platform integrates artificial intelligence to accelerate scientific discovery and data management globally.
sierra.ai · HQ: San Francisco, United States · LLM & Generative AI · AI Agents · Conversational AI · 1001-5000 employees · Est. 2023 · Trust A · Hiring 178, 11 new
HQ: San Francisco, United States · LLM & Generative AI · AI Agents · Conversational AI · 1001-5000 employees · Est. 2023 · Trust A · Hiring 178, 11 new
Sierra is an American artificial intelligence company founded in 2023 by Bret Taylor, the former co-chief executive of Salesforce and chairman of OpenAI, together with a former Google engineering leader. It builds conversational agents that handle customer service interactions end to end for large consumer businesses, resolving issues by acting on the company's own systems rather than only answering questions, and it charges per resolved outcome rather than per seat. Headquartered in San Francisco and privately held at a multi-billion dollar valuation, it works with retailers, telecommunications operators, financial services firms and healthcare providers.
rheaction.com · HQ: San Francisco, United States · Artificial Intelligence · Hiring 17, 3 new
HQ: San Francisco, United States · Artificial Intelligence · Hiring 17, 3 new
Rheaction offers startup recruiting and talent search, connecting ambitious companies with exceptional people through human-led, AI-powered talent discovery.
