Senior Software Engineer, Workers Runtime

Join Databricks as a Senior Engineering Manager specializing in AI Runtime. In this pivotal role, you will lead a talented team in developing innovative solutions that drive the future of artificial intelligence. Your expertise will guide the architecture and implementation of AI runtime components, delivering scalable and efficient systems that empower our clients to harness the full potential of AI technologies.Your responsibilities will include fostering a collaborative environment, mentoring team members, and ensuring the team's alignment with our strategic vision. You will collaborate closely with cross-functional teams to define and execute the roadmap for AI runtime, ensuring high performance and reliability.

At Lemurian Labs, we’re dedicated to democratizing the power of AI while ensuring a minimal environmental impact. Our focus is on the profound influence AI has on society and the planet, and we’re committed to creating a robust foundation for its future, promoting sustainable and responsible AI growth. After all, innovation should benefit the world.We are developing a state-of-the-art, high-performance compiler that allows developers to 'build once, deploy anywhere.' This means seamless cross-platform functionality—train your models in the cloud and deploy them at the edge, all while optimizing for resource efficiency and scalability.If you're passionate about sustainably scaling AI and excited about making powerful AI development accessible, we invite you to join our team at Lemurian Labs. Be part of a fun and innovative environment where you can help shape the future without leaving a mess behind.

Join Sysdig as a Senior Software Engineer specializing in Runtime. In this role, you'll be at the forefront of developing innovative solutions that enhance our runtime security and monitoring products.You'll collaborate with a dynamic team, leveraging cutting-edge technologies to tackle complex challenges. We are looking for passionate engineers who thrive in a fast-paced environment and are eager to make a significant impact.

About UsAt Physical Intelligence, we are pioneers in integrating general-purpose AI into the physical realm. Our team comprises dedicated engineers, scientists, roboticists, and innovators focused on creating advanced foundation models and learning algorithms that will empower the robots of today and the physically-actuated devices of tomorrow.To achieve outstanding real-world performance, we prioritize ultra-low system latency, reliable sensor pipelines, and comprehensive engineering that ensures perception and control loops function seamlessly at real-time speeds.As a Runtime Software Engineer, you will be at the forefront of developing low-latency, high-throughput systems that support our physical intelligence model. Your role will not involve designing ML models; instead, you will optimize the entire stack from the operating system to the camera pipeline and networking, ensuring flawless production execution. You will work closely with researchers, platform engineers, and robotics operators to identify performance bottlenecks and maximize system efficiency.The TeamOur Runtime team is crucial in creating the foundational platform that our robots, sensors, and evaluation systems depend on. This team excels in Linux systems engineering, camera and sensor integration, robot actuator control, networking, real-time input/output, and performance optimization tools. They ensure that our machine learning models and control systems function within strict latency constraints and are resilient under real-world conditions.Your ResponsibilitiesManage Real-Time Pipelines: Design and implement low-latency, high-reliability sensor and actuator pipelines utilizing Linux, drivers, and middleware.Enhance System Performance: Analyze and optimize computational efficiency across I/O, memory, scheduling, networking, and storage to satisfy real-time requirements and boost throughput.Develop OS-Level Features: Modify or expand Linux components, drivers, and scheduling mechanisms to ensure deterministic performance under load.Streaming & Video Systems: Create and refine real-time video streaming systems with precise frame timing and packet scheduling.Ensure Reliability & Debugging: Develop tools for profiling, tracing, and resolving timing challenges across distributed systems and hardware interfaces.Collaborate Across Functions: Partner with researchers, hardware engineers, and operational teams to drive system performance and reliability.

Join Cloudflare as an Engineering Manager for our Workers Runtime within the Edge Team, where you will lead a dynamic group of engineers dedicated to enhancing our edge computing capabilities. You will play a pivotal role in shaping the future of our technology while fostering an innovative and collaborative work environment. This is a unique opportunity to influence the development of products that impact millions of users globally.

About Retell AIAt Retell AI, we are pioneering the future of call centers through innovative voice AI technology. Our cutting-edge solutions are transforming how companies engage with customers.In just 18 months since our inception, we've empowered thousands of businesses with our AI voice agents that efficiently manage sales, support, and logistics calls, significantly reducing the need for large teams of human agents. Supported by industry-leading investors including Y Combinator and Alt Capital, we've grown our annual recurring revenue from $5M to an impressive $36M while expanding our team from 5 to 20 talented individuals since 2025.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform where entire contact centers are driven by AI. Unlike basic automation requiring constant human oversight, we’re engineering intelligent AI “workers” capable of serving as frontline agents, quality assurance analysts, and managerial roles, all while optimizing customer interactions continuously.We are rapidly expanding and seeking driven builders who thrive on solving complex technical challenges, act decisively, and wish to make a tangible impact in one of the fastest-growing voice AI startups.Join us in shaping the future!Recognized as a top 50 AI application in the a16z list: https://tinyurl.com/5853dt2xRanked #4 in Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025Featured among the top startups on: https://leanaileaderboard.com/

About HandshakeHandshake serves as the premier career network tailored for the burgeoning AI economy. Trusted by 20 million knowledge workers, 1,600 educational institutions, and a million employers—including every Fortune 50 company—Handshake is pivotal in facilitating career discovery, hiring, and upskilling, from freelance AI training roles to internships and full-time positions. Our unique value proposition has led to exceptional growth, with our Annual Recurring Revenue (ARR) projected to triple by 2025.Why You Should Join Handshake Now:Influence the evolution of careers within the AI economy on a global scale, making a tangible impact for your community.Collaborate with elite AI labs, Fortune 500 partners, and leading educational institutions.Join a team led by professionals from Scale AI, Meta, xAI, Notion, Coinbase, and Palantir, among others.Contribute to building a rapidly expanding business projected to generate billions in revenue.About the RoleThe Senior Engineering Manager at Handshake AI will oversee a vital product and platform engineering team responsible for developing systems that seamlessly integrate human expertise into AI development workflows. This team manages essential infrastructure that links talent networks, data operations, and research requirements into scalable, reliable, and high-quality platforms. You will play a pivotal role at the crossroads of engineering, product, and operations, ensuring our systems can accommodate rapid growth, intricate workflows, and cutting-edge AI partners. You will lead a team of approximately 9 engineers and will be expected to expand leadership capacity, including managing another engineering manager, as we scale.Location: San Francisco, CA. This position requires in-office attendance, 5 days/week (no remote or hybrid options).Your ResponsibilitiesLead, recruit, and nurture a high-performing engineering team focused on developing core product and platform infrastructure.Define and execute the roadmap in close collaboration with Product, Research, and Operations teams.Drive the architectural and technical strategy for scalable, reliable, and extensible systems.Develop modular platforms that facilitate quick launches for new domains, workflows, and partners.Enhance engineering standards across reliability, observability, performance, and data integrity.Cultivate a culture of ownership, accountability, and continuous improvement within the team.

Join Asana as a Senior Engineering Manager focused on AI Agents, where you will lead the development of innovative AI solutions.As a pivotal member of our engineering team, you will collaborate with cross-functional groups to design and implement cutting-edge AI technologies. Your leadership will guide a team of talented engineers in creating intelligent systems that enhance user experience and drive productivity.

Baseten seeks a Software Engineer to focus on Voice AI within the Inference Runtime team. This San Francisco-based role centers on building and refining AI models that power voice interaction features in Baseten products. Role overview This position involves hands-on work with AI models for voice-driven applications. The engineer will help shape how users interact with voice technology by developing and optimizing the underlying systems. What you will do Develop and optimize AI models for applications that use voice as a primary interface Work on inference runtime systems to support responsive and intelligent voice experiences Contribute directly to Baseten's products, influencing the future of voice technology for users Location This position is based in San Francisco.

Saris AI develops advanced AI automation for the banking sector, with teams in San Francisco, Montreal, and Toronto. The company addresses large-scale automation challenges, focusing on long-context reasoning, integrating with legacy systems, and meeting strict compliance needs. Saris AI’s AI agents are already active in production, supporting real customer workflows as the business expands. Role overview The San Francisco engineering team is seeking an Engineering Manager. This leader will guide engineers through shifting priorities and frequent ambiguity. The position involves building and leading teams, managing projects from concept to launch, and ensuring the delivery of reliable software that powers AI-driven products. What you will do Build and lead engineering teams focused on automation and AI Oversee software projects from initial idea through production launch Adapt to changing requirements and priorities as the company grows Address the technical challenges unique to deploying software in AI systems Requirements Proven experience building and leading engineering teams History of delivering software projects from start to finish Comfort working in environments where priorities and requirements shift quickly Understanding of the complexities involved in AI-driven software deployment Location This role is based in San Francisco.

Join Retell AIAt Retell AI, we leverage first principles to revolutionize the call center experience through innovative voice AI technology.In just 18 months since our launch, our AI voice agents have been adopted by thousands of companies to manage sales, support, and logistics calls, significantly reducing the need for large teams of human agents. Supported by Y Combinator, Alt Capital, and other notable investors, we've achieved impressive growth, scaling from $5M to $36M ARR with a dedicated team of 20.Looking ahead to 2026, we aim to create a comprehensive AI-powered Customer Experience (CX) platform that transforms entire contact centers. Instead of simple automation requiring ongoing human oversight, we are developing intelligent AI "workers" that serve as frontline agents, QA analysts, and managers — perpetually executing, monitoring, and enhancing customer interactions.We're experiencing rapid growth and are on the lookout for passionate innovators eager to tackle complex technical challenges, accelerate progress, and make a significant impact at one of the leading voice AI startups.Let’s build the future together.Ranked in the top 50 AI applications by a16z: https://tinyurl.com/5853dt2x#4 on Brex's Fast-Growing Software Vendors list for 2025: https://www.brex.com/journal/brex-benchmark-december-2025One of the top startups on: https://leanaileaderboard.com/

Responsibilities:Develop Our Product. Take ownership of software features that enhance our AI platform, empowering private market investors to analyze deals swiftly and accurately. This role requires you to actively engage in coding and delivering essential platform components from the ground up.Ensure Quality and Excellence. Establish and maintain coding standards, architectural guidelines, and review procedures; mentor fellow engineers. Co-cultivate a culture centered on practical, reliable, and test-driven development that swiftly meets business requirements.Scale for Growth. Assist in monitoring and scaling the architecture of our platform and its infrastructure.Collaborate Across Functions. Engage closely with product, security, and go-to-market teams to translate our strategic roadmap into actionable features and deliverables.

Join Affinity as a Senior AI Engineer and contribute to our cutting-edge AI platform. We are seeking a talented engineer passionate about artificial intelligence and its applications in real-world scenarios. In this role, you will collaborate with cross-functional teams to design, develop, and enhance AI solutions that drive our business forward.

Join the Revolution at Retell AIRetell AI is pioneering the future of call centers through innovative voice AI, driven by first principles thinking.In just 18 months since our inception, we have empowered thousands of businesses with our AI voice agents, transforming how sales, support, and logistics calls are managed—previously requiring extensive human teams. Supported by prestigious investors such as Y Combinator and Alt Capital, we've rapidly scaled from $5M ARR to an impressive $36M ARR with a compact yet dynamic team of 20.Our ambition for 2026 is to create a revolutionary customer experience platform, where entire contact centers are powered by AI. Moving beyond basic automation, we aim to develop intelligent AI “workers” that serve as frontline agents, QA analysts, and managers, continuously enhancing customer interactions without the need for constant human oversight.As we expand, we are seeking passionate engineers who are eager to solve challenging technical problems, act swiftly, and make a significant impact in one of the fastest-growing voice AI startups. Let’s shape the future together.

fractional-ai is looking for a Senior or Staff Software Engineer to join the San Francisco office. This position centers on building advanced AI solutions with a team that values both technical depth and collaboration. Role overview This role focuses on designing and developing AI-driven systems. The work involves solving technical challenges and contributing to projects that push the boundaries of what AI can achieve. Collaboration with other engineers and stakeholders is a key part of daily responsibilities. Who will thrive Experienced engineers with a strong background in software development Those who enjoy working on complex technical problems Individuals who value teamwork and open communication Location This position is based in the San Francisco office.

Join Fieldguide as a Senior AI Engineer, where you will lead innovative projects at the forefront of artificial intelligence. In this pivotal role, you will design, develop, and implement cutting-edge AI solutions that drive our business forward.We are looking for a passionate engineer who thrives in a dynamic environment and is eager to tackle complex challenges. You will collaborate closely with cross-functional teams to ensure the successful integration of AI technologies into our existing systems.

Join Accordion as a Senior AI Engineer, where you'll be at the forefront of innovative AI solutions. In this key role, you will design, develop, and implement advanced artificial intelligence algorithms and models to enhance our product offerings. Collaborate with cross-functional teams to translate complex data into actionable insights, driving the success of our projects.

At Crusoe, we are on a mission to accelerate the convergence of energy and intelligence. We are building a powerful engine that enables individuals to innovate boldly with AI, all while upholding principles of scalability, speed, and sustainability.Join us in spearheading the AI revolution through sustainable technology. At Crusoe, you will be at the forefront of meaningful innovation, making a significant impact while collaborating with a team dedicated to shaping the future of responsible, transformative cloud infrastructure.About the Role:As a Senior Software Engineer on the Model Lifecycle team, you will play a pivotal role in developing a managed platform that supports the entire application development lifecycle, with an emphasis on harnessing the power of Machine Learning models, particularly Large Language Models (LLMs).Your Responsibilities:Design and maintain systems for fine-tuning large foundational models (SFT, PEFT, LoRA, adapters), ensuring multi-node orchestration, checkpointing, failure recovery, and cost-effective scaling.Create and manage end-to-end training pipelines for Large Language Models.Implement components for distillation and reinforcement learning pipelines, focusing on preference optimization, policy optimization, and reward modeling.Develop and sustain the core agent execution infrastructure.Implement features for dataset, model, and experiment management, emphasizing versioning, lineage, evaluation, and reproducible fine-tuning.Collaboration and Impact:Collaborate closely with Senior Engineers, Principal Engineers, and various product and platform teams to implement systems abstractions and APIs.Engage in technical discussions surrounding training runtimes, scheduling, storage, and overall model lifecycle management.Bring 4-5+ years of industry experience, demonstrating a strong track record of successfully leading a diverse portfolio of initiatives.Participate in and contribute to the open-source LLM ecosystem.This position involves taking significant ownership of core system components.Your Qualifications:Engineering Fundamentals:Bachelor's degree in Computer Science, Engineering, or a related discipline.Proven experience in software engineering with a focus on AI models and machine learning.

Join Our Innovative Team at Retell AIRetell AI is at the forefront of revolutionizing the call center industry through advanced voice AI technology. In just 18 months since our inception, we have empowered thousands of businesses to optimize their sales, support, and logistics calls, which previously relied on large teams of human agents. Supported by prominent investors including Y Combinator and Alt Capital, we've achieved remarkable growth, scaling from $5 million to $36 million in annual recurring revenue (ARR) while expanding our talented team to 20 members.Our ambitious vision for 2026 is to develop a state-of-the-art customer experience platform, transforming entire contact centers with AI. Unlike traditional automation that requires ongoing human oversight, we are building intelligent AI "workers" capable of functioning as frontline agents, quality assurance analysts, and managers, constantly enhancing customer interactions.If you are a passionate innovator eager to solve complex technical challenges and make a tangible impact at one of the fastest-growing voice AI startups, we invite you to join us in shaping the future.Ranked among the top 50 AI applications by a16z: a16z List4th on Brex's Fast-Growing Software Vendors of 2025: Brex BenchmarkFeatured as a leading startup on: Leanaileaderboard