2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Intern, Software Engineer AI Agents (Fall/Winter 2026)
Software engineering intern on Bot Auto's AI Agents team in Houston, TX, building LLM-powered agents that automate engineering, fleet operations, and business workflows. Day-to-day involves backend services and APIs, LLM integrations, prompt engineering, and evaluating agent frameworks.
Senior Engineering Manager
Twindo is at the forefront of revolutionizing the remodeling, architecture, and interior design industry through cutting-edge AI and computer vision technology. With our LiDAR-enabled iPhone or iPad scans, we capture…
Flight Software Engineer (Early)
Design, build, and own the flight software that autonomously operates Apex's satellite buses — mission-critical systems running 24/7, from initial design through deployment, testing, and launch/early-operations support. Core stack includes Python, C++, Rust, real-time distributed systems, embedded Linux/Yocto, and satellite protocols like CCSDS and ECSS.
Senior RF/Comms System Engineer
Senior RF/Comms Systems Engineer at Apex (Los Angeles, onsite) driving clean-sheet design of RF, digital, and optical communications systems for satellite buses and ground stations: requirements, link budgets and simulations, MATLAB analysis tools, supplier selection, and hardware integration/test. Requires 5+ years of spacecraft RF/telemetry experience.
Senior Software Engineer, Platform Security
Founding platform security engineer at Decagon who designs, builds, and operates the security infrastructure behind its conversational AI platform — building paved paths for secure services, Terraform/GitOps automation, secrets management, and IAM on GCP/AWS. In-office role in San Francisco; $170K–$305K plus equity.
Member of Technical Staff — RL & Agentic Model Training
Design/frontend lead role at Moonlake (AI world-simulation startup): own end-to-end UX and frontend implementation for AI-generated world tools, from rapid prototyping to production, using React, Next.js, TypeScript and Tailwind CSS. On-site in San Francisco. Note: the posting title says RL & Agentic Model Training, but the description describes a Head of Design role.
Systems Engineer
Systems Engineer at ICON's Austin, TX office supporting hands-on development of the Titan construction 3D-printing machine as it moves to serial production — designing, integrating, prototyping, and testing electromechanical and robotic systems using SolidWorks, electrical schematics, and modeling/simulation tools alongside senior engineers.
Software Engineer, Data Systems (Python)
Northbeam, a marketing intelligence platform for eCommerce brands, is hiring a data-tilted software engineer to build and maintain its data pipelines, platform integrations, and APIs. Day to day: ingesting and transforming data from ad platforms and order systems using Python, SQL, cloud warehouses, and orchestration tools in event-driven and batch architectures.
Software Engineer, Python
Mid-level, backend-leaning Python engineer at Northbeam, a marketing intelligence platform for eCommerce brands. You build features end to end (~70% backend, 20-30% frontend): incrementality/experimentation, near-real-time data pipelines, AI-powered marketer workflows, and some React/TypeScript frontend.
Staff Software Engineer, Platform Infrastructure (Foundations)
About Anyscale: At Anyscale, we're on a mission to democratize distributed computing and make it accessible to software developers of all skill levels. We’re commercializing Ray, a popular open-source project that's…
Member of Technical Staff (Platform Leaning)
Product-engineering role with a platform twist at Tessl, a London startup building an AI-native software development platform. You'll mostly ship end-to-end product features (TypeScript/Node), while leaning into AWS/EKS infrastructure, networking, observability, and building AI agents that automate ops work like alert triage and dependency upgrades.
Software Engineer - Infrastructure
Maintain and scale a platform for autonomous coding agents using Kubernetes, Go, and Python. Responsibilities include managing distributed microservices, GitOps with ArgoCD, observability via Grafana and New Relic, and supporting AI agent workloads across GCP and AWS.
Software Engineering Intern
Emergent Labs is hiring a software engineering intern in San Francisco to build and ship real production backend services (Python/Go) for its autonomous coding-agent platform, working across infrastructure, AI/ML, and product teams while learning distributed systems and scalability.
Senior Java Developer - Mobile Game Platform
Senior Java Developer building and scaling distributed backend services for a mobile game start-up in Hong Kong. Day to day involves writing high-quality Java 8 code with Spring/Spring Boot, delivering robust RESTful services in agile sprints with CI practices, plus localization and operations tasks. Immediate availability preferred.
Senior JAVA Developer (game industry start-up, up to 50k)
Senior Java developer at a well-funded Hong Kong start-up building mobile mini-games. Day to day: write maintainable Java 8/Spring Boot code for game applications, support game localization and operations, maintain game servers, and handle testing, optimization and troubleshooting.
Founding Engineer
Founding engineer at Delfa, a London startup building autonomous AI agents to automate clinical trials. You'll design, build, and scale AI agent systems end-to-end — voice interactions, workflow orchestration, data pipelines, and observability — using FastAPI, TypeScript/React, OpenAI/Anthropic models, Temporal, and PostgreSQL, onsite 5 days a week.
Founding Engineer
Founding engineer (employee #3) at Motherboard Labs, an a16z speedrun-backed startup building an AI agent operating layer for fleets of robots and autonomous machines. You'll split time between hands-on customer deployments and shared platform work — integrations, agent tooling, and fine-tuning models for machine diagnostics — in person from San Francisco with 25–50% travel.
Software Engineer - L1, Implementation (Hybrid)
Builds and integrates conversational AI chatbots using Haptik’s platform tools, combining backend web technologies with API integrations to deliver scalable client solutions in chat/voice formats.
Software Engineer, GPU Kernels
Builds performance-critical GPU kernels (attention, matrix multiplication, mixture-of-experts, low-precision FP8/FP4 compute) for River AI's training and inference infrastructure. Day to day: profiling workloads, writing kernels with CUDA/Triton/CUTLASS in C++ and Python, and integrating optimizations into training and serving runtimes.