Senior Infrastructure Engineer
2 days ago
Join to apply for the Senior Infrastructure Engineer role at LMArena LMArena is seeking a Senior Infrastructure Engineer to define, build, and evolve the technical foundations that power the world’s most transparent AI evaluation platform. This is not just an architecture role - you’ll partner directly with product, security, and data teams to identify bottlenecks, design resilient systems, and ship the code that keeps our platform fast, reliable, and secure at scale. You’ll have a broad impact across the stack: optimizing performance, building primitives that accelerate feature delivery, hardening our systems against abuse, and scaling infrastructure to handle billions of API requests and real‑time votes. If you love working across boundaries, getting deep into code, and making infrastructure a product in its own right, this is the role for you. Responsibilities Own technical strategy for LMArena’s core infrastructure - networking, APIs, services, data systems, and security foundations. Design and implement high-performance systems that scale to hundreds of millions of real-time interactions and evaluations per day. Collaborate with security engineering to embed anti‑abuse measures, Sybil resistance, and trust systems into core platform architecture. Partner with product engineering to deliver infrastructure improvements that directly accelerate feature velocity and reliability. Build developer-facing primitives and tooling—internal APIs, SDKs, CI/CD enhancements—that make our platform more productive and safe to build on. Monitor, profile, and optimize system performance across backend services, databases, and networking layers. Drive operational excellence through observability, capacity planning, and incident response best practices. Mentor engineers across the company in building scalable, performant, and secure systems. About LMArena Created by researchers from UC Berkeley’s SkyLab, LMArena is an open platform where anyone can access, explore, and interact with the world’s leading AI models. By comparing them side by side and casting votes, the community shapes a public leaderboard, making AI progress more transparent and grounded in real‑world usage. Trusted by Google, OpenAI, Meta, xAI, and more, LMArena is rapidly becoming essential infrastructure for human‑centered AI evaluation at scale. With over one million monthly users and growing developer adoption, your work will influence the next generation of safe, aligned AI systems. Requirements 8+ years of experience in backend, infrastructure, or systems engineering, including staff‑level scope in a high‑scale production environment. Proven experience designing and operating distributed systems at scale (millions of DAU / billions of requests). Deep knowledge of networking fundamentals, service‑to‑service communication, and traffic routing at scale. Hands‑on experience with performance profiling, observability, and reliability engineering. Track record of collaborating with security and product engineering to deliver both foundational systems and user‑facing features. Clear communicator who can lead technical discussions, build alignment across teams, and partner with us to prioritize the needs of the business. Bonus Points Experience with Node.js, Typescript, Serverless Environments, Postgres Background in anti‑abuse systems, security engineering, or trust & safety platforms. Experience building infrastructure for real‑time, user‑driven platforms. Location: San Francisco Bay Area | Employment: Full‑time | Seniority level: Mid‑Senior level #J-18808-Ljbffr
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Senior Machine Learning Engineer
3 weeks ago
San Francisco, United States Top Engineer Full timeTOP ENGINEER JOB POST!!! Confidential Search for International Employer Industry: Social Commerce / AI Technology Degree: BS in Computer Science or Mathematics from Top 40 University Experience: 4-8 years in Production ML Systems AI-POWERED SOCIAL COMMERCE REVOLUTION Role: Senior Machine Learning Engineer - Multimodal AI Join a leading partner in social...
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Senior Machine Learning Engineer
2 days ago
San Francisco, CA, United States Top Engineer Full timeTOP ENGINEER JOB POST!!! Confidential Search for International Employer Industry: Social Commerce / AI Technology Degree: BS in Computer Science or Mathematics from Top 40 University Experience: 4-8 years in Production ML Systems AI-POWERED SOCIAL COMMERCE REVOLUTION Role: Senior Machine Learning Engineer - Multimodal AI Join a leading partner in social...
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Senior Infrastructure Engineer
2 days ago
San Francisco, United States Corridor Full timeCorridor Security Inc. Senior Infrastructure Engineer San Francisco, CA·Full time Company website Apply for Senior Infrastructure EngineerCorridor is hiring a Senior Infrastructure Engineer to help drive the development of Corridor's architecture, scale our systems to support increasing load, and improve the developer experienceAbout Corridor Security...
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Senior Infrastructure Engineer
4 weeks ago
San Francisco, United States SentiLink Full timeSenior Infrastructure Engineer Join to apply for the Senior Infrastructure Engineer role at SentiLink. About Us SentiLink provides innovative identity and risk solutions, empowering institutions and individuals to transact confidently. We are building the future of identity verification in the United States and reinventing the currently clunky, ineffective,...
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Senior Infrastructure Engineer
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San Francisco, United States Adaption Full timeAbout Us We believe the future is adaptable, and not one-size-fits-all. We will lead in real‑time efficient adaptation that combines algorithm with innovative interface design. Our global team—based in SF and beyond—brings together top talent in AI innovation. Backed by world‑class investors, we’re building Adaptable Intelligence. The Role You’ll...
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Senior Infrastructure Engineer
4 weeks ago
San Francisco, United States Sinclair Talent Solutions Full timePay RangeThis range is provided by Sinclair Talent Solutions. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.Base Pay Range$150,000.00/yr - $200,000.00/yrAbout the CompanyWe are helping a rapidly scaling startup building mission-critical solutions for enterprise clients. The platform tackles complex...
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Senior Software Engineer, Infrastructure
2 weeks ago
San Francisco, United States OPAQUE Systems Full timeSenior Software Engineer, Infrastructure Join to apply for the Senior Software Engineer, Infrastructure role at OPAQUE Systems About Opaque Were building a secure, privacy-preserving data and AI platform called the Confidential AI platform. Our mission is to build the trust layer for the agentic economy, enabling organizations to build agents that operate on...
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Senior Software Engineer, Infrastructure
2 weeks ago
San Francisco, United States OPAQUE Systems Full timeSenior Software Engineer, Infrastructure Join to apply for the Senior Software Engineer, Infrastructure role at OPAQUE Systems About Opaque We’re building a secure, privacy-preserving data and AI platform called the Confidential AI platform. Our mission is to build the trust layer for the agentic economy, enabling organizations to build agents that operate...
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Senior Infrastructure
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San Francisco, United States CDW Full timeSenior Infrastructure & Security Engineer This range is provided by CDW. Your actual pay will be based on your skills and experience talk with your recruiter to learn more. We can NOT provide sponsorship or work C2C. W2 ONLY. This is a 12-month contract through CDW working for our end client. There is potential for contract extension(s). Ability to work 4...
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Senior Infrastructure Engineer
2 days ago
San Francisco, United States Bland Full timeSenior Infrastructure Engineer at Bland Join to apply for the Senior Infrastructure Engineer role at Bland. Get AI‑powered advice on this job and more exclusive features. This range is provided by Bland. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range $120,000.00/yr - $200,000.00/yr...
