Back-End Engineer
Fifth Door
About Us Fifth Door unlocks the power of imagination by making it easy for anyone to create, share, and play turn-based games anywhere, with anyone. We exist to inspire connection, creativity, and community through the limitless joy of games. Create. Play. Anywhere. About the Role We are seeking a Back-End Engineer who is passionate about delivering outstanding user experiences that delight our users. This is an opportunity to join a fast-moving, ambitious team where your work will have real impact from day one. Responsibilities Help architect, develop, and maintain the backend for our AI-powered game engine and web applications. Collaborate with cross-functional teams to design scalable and secure systems. Optimize applications for maximum speed, performance, and scalability. Write clean, maintainable, and well-tested code. Identify and troubleshoot back-end performance issues. Stay current with trends and emerging technologies, bringing ideas back to the team. Qualifications Must-Have: 3+ years of experience as a backend or full stack engineer or similar role. Expert proficiency in a programming language used on the backend, such as Ruby, Typescript, Python, or Golang Strong understanding of backend development concepts (e.g. API development, structuring applications, databases, workflows) Experience working with databases, both SQL and NoSQL Familiarity with modern build pipelines and tools Strong interest in AI technologies or experience integrating AI into a product Experience working in an agile development environment Proficiency using AI tools in development workflows Nice-to-Have: Some familiarity with front-end technologies and working with Typescript and React is a plus. Passion for gaming, creative tools, or AI applications. Experience with AI prompt engineering. Benefits Competitive salary and meaningful equity. Health, dental, and vision coverage. Flexible work hours and unlimited vacation policy. A collaborative, supportive team environment. Opportunity to shape product direction and culture early. #J-18808-Ljbffr Fifth Door
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- ...from a top 50 CS school. Previous experience working at a startup. 4 - 10 years of experience. We're looking for a senior software engineer. Nice-to-haves What could make your candidate stand out Strong interest/passion about AI What it means to be an early engineer...Suggested
$275k - $325k
...and overcoming obstacles. About Hazel Hazel.ai is building the AI engine for wealth management that unlocks 10x growth, efficiency and... ...quality signals. Your impact Design and build Hazel's evals platform end-to-end – online scoring, offline benchmarks, regression suites,...SuggestedWork at officeImmediate startAltruist
San Francisco, CA9 hours ago- About the role Help build and scale the backend systems that power our core booking and scheduling platform. You'll work on APIs, services, and infrastructure that directly support thousands of small businesses and their customers. Requirements 3+ years of experience building...Suggested
Kalendir LLC
San Francisco, CA2 days ago - ...We’re looking for a seasoned backend engineer to own key data, search, AI, and core backend infrastructure projects as we rapidly evolve Tako’s capabilities. In making the world’s knowledge available, composable, and shareable to AI, we are tackling several difficult...
TAKO, Inc.
San Francisco, CA9 hours ago - ...point where cutting‑edge AI meets real clinical impact, giving clinicians hours back each day to focus on what matters most - their patients. Position Overview We are seeking a Backend Engineer to design, build, and scale the core infrastructure powering Knowtex’s AI‑...
Knowtex
San Francisco, CA9 hours ago - Fifth Door in San Francisco is seeking a skilled Back-End Engineer to develop and maintain their AI-powered game engine. This role is critical for enhancing user experiences through innovative technology. The ideal candidate has over 3 years of experience, strong proficiencies...Flexible hours
- ...2+ year lead and regulatory advantages), we are setting out to become a $100B+ company. We're seeking a talented Backend Software Engineer to join our innovative team and play a crucial role in developing our AI‑driven healthcare platform. As a key member of our engineering...Work at officeMonday to Friday
HealthLeap
San Francisco, CA2 days ago $130k - $190k
...Join to apply for the Backend Engineer role at Conduit AI. This range is provided by Conduit... ...assign maintenance, text the vendor, confirm back to the resident, and close the loop.... ...Conduit AI by 2x. Get notified about new Back End Developer jobs in San Francisco, CA . #J-1...Full timeFlexible hoursConduit AI
San Francisco, CA9 hours ago- ...org allows real-time collaboration on important example workflows. Founded in 2012 we have over 10,000 customers worldwide and are backed by fantastic investors such as Example Capital. Example has raised its Series C and is valued at $750 million dollars. This example...Work at officeWorldwideFlexible hours
Tiger Corporation
San Francisco, CA2 days ago - ...integrity and performance. Debug customer issues end-to-end: Trace with logs/metrics/traces,... ...millions of AI interactions. We are backed by top‑tier investors and are well... ...wins, whether it comes from a founder or an engineer who joined yesterday. We let results and...Work at officeRemote work
Mem0
San Francisco, CA3 days ago $180k - $215k
...As a Backend Engineer on our application team at Windfall, you will be building the system for ingesting and processing our customer data. It is the “brains” of everything our customers interact with. Communication and collaboration are at the heart of Windfall and you...Windfall
San Francisco, CA1 day ago- ...growing startup (with over a million users), is seeking a Backend Engineer. In this role, you will be implementing available, resilient... ...developer with 1 – 3 years of proven, hands‑on experience with the back‑end of large‑scale web applications, you might just be the key...
Boxtro
San Francisco, CA9 hours ago $130k - $160k
...Join to apply for the Backend Engineer role at Grepr This range is provided by Grepr. Your actual pay will be based on your skills and experience... ...systems, modern Java web applications and RESTful APIs for end users and front-end development are important . The ideal...Full timeWork at officeFlexible hours3 days per weekGrepr
San Francisco, CA1 day ago$350 per month
...Location: Remote or Hybrid (SF or NYC) ReadMe is looking for a back end engineer who enjoys working in a collaborative team environment. Our teams are full of curious, creative, and committed people who love what they’re building. If that sounds like you, you’ll be right...Remote workWork from homeHome officeFlexible hoursGrabJobs
San Francisco, CA4 days ago$120k - $250k
...Lightning. Founded in 2019, we build an end-to-end platform for developing, training,... ...San Francisco, Seattle, and London, and is backed by Coatue, Index Ventures, Bain Capital... ...looking for We are looking for a Backend Engineer to work on developing and scaling the Lightning...Work at officeLocal areaHome officeFlexible hours2 days per weekLightning AI
San Francisco, CA9 hours ago$135k - $250k
...SMB to Fortune 500 enterprises—is racing to combat this problem. Backed by Greylock Partners and founded by early Abnormal Security... ...product experiences . We are an AI-native company , and Fable engineers are excited to use AI-powered development practices to move faster...Work experience placementWork at officeRelocation package3 days per weekfable social
San Francisco, CA10 hours ago- ...re debugging a distributed system, or monitoring a sprawling backend deployment for security risks, so many problems that modern engineering teams face are ultimately about sifting through giant haystacks in search of small but valuable needles. Scanner provides a magical...Immediate startFlexible hours
Scanner.dev
San Francisco, CA10 hours ago - ...the opportunity to drive impact across multiple mission‑driven initiatives. THE ROLE We’re hiring a Backend Engineer who will architect and maintain the back‑end services and data pipelines that power our platforms – and you’ll turn the data flowing through them into the...
Sgff.Org
San Francisco, CA9 hours ago - ...Movewear products and transform millions of lives in the coming years. THE ROLE We are seeking a highly motivated and adaptable backend engineer to own the systems powering a new generation of wearable robots – from APIs and data pipelines connecting devices to the cloud, to...Full timeWork at officeRelocation
Skip
San Francisco, CA9 hours ago $80 per hour
...Role overview We're looking for a backend engineer to help build and scale our integration... ...orchestration for our customers' tech stacks. Own end‑to‑end delivery of backend features and... ...high‑quality customer experiences backed by robust backend systems. Requirements 4...Work at officeLocal areaDispatch
San Francisco, CA9 hours ago$120k - $150k
...and Vestigo Ventures. About the role We're looking for a Backend Engineer who wants to build and own critical systems in a fast-moving... ...databases (NoSQL preferred, e.g., MongoDB) Ability to own projects end-to-end and operate independently Strong communication skills across...Remote workHome officeWork visaClerkie
San Francisco, CA1 day ago$120k - $150k
...in the San Francisco Bay Area. We\'re looking for exceptional engineers to define and build the next generation of our consumer privacy... ...management, data transcoding, secure and fast cloud sync, and back-end custom analytics development for the future. You\'ll...Full timeContract workH1bRemote workWork from homeKeepsafe Inc
San Francisco, CA9 hours ago- Side, headquartered in San Francisco, seeks a Mid-Level Backend Software Engineer to build and maintain backend services powering payments and commission workflows. You will collaborate across Product, Customer Success, Finance, and other engineering teams to deliver scalable...
$160k - $210k
...5-8 years) About this role Lattice Protocol is building infrastructure for decentralized identity verification. We need a backend engineer who thinks in systems - someone who can design APIs that handle millions of verification requests while maintaining sub-100ms latency...Full time- A cutting-edge technology company in San Francisco is seeking a Software Engineer to build and optimize core product features. You'll tackle complex challenges in real-time voice processing and telephony systems as part of a small, dynamic team. Candidates should have...
$195k - $280k
...cutting-edge thinking with the long-term backing of leading insurer, State Farm. Learn... ...insurance technology innovation company that engineers advanced risk prediction and prevention... ...of substantial product features end-to-end # Evaluate and integrate with third...Remote jobExtra incomeLocal areaWork from homeHome officeFlexible hoursQuanata
San Francisco, CA25 days ago- Instant is seeking a Founding Backend Engineer to join their team in San Francisco, focusing on building infrastructure for a database company. The role involves tackling complex backend challenges such as managing high connection volumes and enhancing system capabilities...
- ...the infrastructure powering the next generation of autonomous AI agents. Backed by top-tier Silicon Valley investors with over $30M in funding , they're tackling some of the hardest engineering problems in AI—turning real-world agent behaviour into structured learning...
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