2,918 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Senior Platform Software Engineer
Camber, a NYC-based behavioral health startup, is hiring the third engineer on its Platform team to build internal tooling and infrastructure that keeps services secure, reliable, and scalable. Core stack includes AWS, PostgreSQL on RDS, ECS, Terraform, Kafka, Temporal, and Datadog/OpenTelemetry, plus developer tooling for working with LLMs. Hybrid in New York City.
Staff Software Engineer, Internal Tools & Automation
Crusoe (AI infrastructure) is hiring a Staff Software Engineer for a new forward-deployed internal tools team in San Francisco. The engineer embeds with internal teams (SRE, Finance, Sales, People Ops), builds full-stack apps, automations, and AI agents, and owns delivery end to end. Requires 8+ years of production software experience, strong SQL, and AI-assisted development.
Senior Engineer, Optical Systems Engineer
Hands-on optical systems engineer at Lumotive (Redmond, WA) who builds, tests, debugs, and optimizes LCM-based LiDAR systems and transmitters — assembling test and calibration stations, running characterization campaigns, and writing Python automation tools while collaborating with optics, hardware, firmware, and software teams.
Senior Software Engineer: AI
Senior Software Engineer building and improving Swayable's AI/ML-powered analytics engine that measures public opinion and message/ad impact. Day-to-day work blends scientific Python development, machine learning, and distributed high-performance computing alongside Vue.js/Node, MongoDB, and GraphQL services.
Software Engineer
Fully remote Software Engineer at Daymark Health, a value-based oncology startup, building its cancer care platform across the stack using Python and AWS managed services (EventBridge, Lambda, DynamoDB). The role emphasizes secure, HIPAA/SOC 2-compliant development, AI-assisted coding (Claude, Cursor), and close collaboration with product, data, and care-delivery teams.
Software Engineer, Data Systems
Builds the distributed storage, query engine, and GPU dataloading behind Eventual's petabyte-scale multimodal data platform (Daft) for Physical AI/robotics teams — video/lidar data lakes on Parquet/Iceberg, vector/VLM-powered search, and line-rate CUDA data pipelines. Core stack is Rust or C++; on-site 4 days/week in San Francisco.
Founding Engineer
Forward-deployed founding engineer at a healthcare startup (YC) automating work in the med-legal space: you own customer relationships end to end and build full-stack systems for reliable LLM agent orchestration, large-scale medical document ingestion, and combined voice/document workflows.
Founding Engineer
Founding Engineer at Kindroid (Beautifully Incorporated) doing core full-stack engineering on the platform — frontend, backend, database, and infrastructure — including building greenfield apps, refactoring the codebase, developing AI fine-tuning pipelines, maintaining GPU clusters, and helping debug customer issues.
Senior Mechanical Systems Engineer (all genders)
Designs and develops mechanical aircraft systems — environmental control, landing gear, ice protection, interiors — for Vaeridion's fully battery-electric CS-23 aircraft, covering the full lifecycle from requirements and architecture through supplier work, testing, and certification. On-site in Munich; needs 8+ years of aerospace mechanical systems experience.
Senior Java Developer
Develops and maintains Java-based backend systems for Localcoin’s Bitcoin ATM network, focusing on secure, scalable integrations and RESTful services while mentoring junior developers.
Senior Software Engineer
Senior full‑stack engineer building end‑to‑end web applications and cloud services that power generative AI‑driven marketing campaigns, collaborating with product, design, marketing and data‑science teams.
Software Engineer (Customer Platform Team)
Senior fullstack engineer on SEON's Customer Platform team, building the core services and customer-facing application behind its fraud prevention and AML compliance product. Day to day involves Node.js/TypeScript/React development, database and API feature design, code reviews, and mentoring, from the Budapest office on a hybrid schedule.
Multimodal Intelligence Systems Engineer
An AI systems engineer builds and deploys vision-language and multimodal computer vision systems that reason over images and video for industrial, hardware-constrained environments, owning model orchestration, production deployment, and evaluation systems. Fully on-site in the SF Bay Area (Burlingame, later San Francisco).
Lead AI Native Engineer
Lead AI Native Engineer at RoboForce (AI robotics) building vertical agents and a shared agent foundation: hands-on coding, architecture, and turning frontier models into production systems for research, software, hardware, data, and operations. On-site 5 days/week in Milpitas, CA.
Senior Software Engineer
Senior full-stack engineer at Tern, a venture-backed platform that gives travel advisors modern software to run their agencies. You own features end to end across a Ruby on Rails/Hotwire/Postgres stack, ship weekly, monitor production, and use AI tools like Claude Code daily.
Senior Software Engineer, Simulation Systems
Senior engineer on Aalyria's Spacetime team building simulation and planning tools that let customers model 'what if' scenarios on complex communications networks. Day-to-day work spans distributed systems, algorithms, and network modeling, with full-stack ownership, primarily in Golang, C/C++, or Java.
Software Engineer, Test & Automation
Own and build hardware-in-the-loop test infrastructure for satellites, automating test orchestration with Python/C/C++ against real or emulated spacecraft hardware in a lab environment.
Software Engineer
Builds software that controls and scales spacecraft and ground infrastructure — flight software interfacing with hardware, simulation/testing frameworks, mission control, and internal tooling. Works across the stack with hardware teams, using languages like C++, Python, or Rust at a space-based solar energy startup.
Senior Software Engineer
Senior software engineer building high-reliability flight, mission, and ground software (C&DH, FDIR, secure comms) plus simulation and hardware-in-the-loop tools for a space-based solar power and orbital compute platform. Core stack is systems-level C++, Rust, and Python, working on-site in San Carlos, CA.