2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Senior Mechanical Integration Engineer
Owns mechanical/structural design, packaging, analysis, testing, and validation of secondary structure (trays, brackets, dynamic isolation, thermal management) for the Terran R rocket's avionics system. Day to day involves 3D CAD design, finite element structural/thermal analysis, and cross-functional integration with propulsion, structures, and vehicle teams.
Launch Integration Engineer II
Relativity Space is hiring a Launch Integration Engineer II in Cape Canaveral to author vehicle processing, build flows, and test procedures for the Terran R rocket, with hands-on floor support during build and test. The role leans on CAD, root cause analysis, and coordination across design, supply chain, production, and test teams.
Founding Engineer
Engineer #1 at Kanurra, an early-stage healthcare startup building an open platform where pharmacy claims are priced, paid, and audited, working onsite in New York alongside the founder. Day-to-day work centers on exactly-once claim payments, a versioned public API, Postgres data isolation, and explainable retroactive drug pricing, using Python, TypeScript, Postgres, and GCP.
Director, Software Engineering
First Director of Engineering at a YC-backed biotech startup using whole-genome sequencing and ML models to improve dairy cattle breeding. Leads engineering managers and staff/principal architects, scaling the org toward ~30 while running delivery of the farm decision engine in an AI-native, spec-first, agentic way. Remote (US).
Member of Technical Staff - Engineering Lead
AIUC is hiring a second engineering lead in San Francisco to co-run its team and own product engineering for its AI-agent security certification/autonomous red-teaming platform as it heads to GA. Roughly a third of the time is hands-on coding (Node.js, TypeScript, Python, AWS), the rest managing and hiring engineers.
Founding Engineer
Founding engineer at a seed-stage security startup (YC W25) that maps cloud infrastructure the way an attacker would, helping security teams find and fix vulnerabilities. Day to day you'd build graph-based infra mapping, agent-driven vulnerability triage, and real-time attack visualization using Cartography, Neo4j, Python/FastAPI, Svelte, and Terraform — onsite in San Francisco.
Software Engineer
Software Engineer at Star Catcher in Jacksonville, FL, developing embedded, flight, and ground software in C++ (embedded Linux) for the company's space-to-space power beaming spacecraft and its orbital power grid. Day to day involves DevOps workflows, Git-based collaboration, test planning, and system integration work.
Senior Software Engineer - Ground & Mission Systems
Star Catcher, a startup building a space-based power grid, seeks a Senior Software Engineer in Jacksonville, FL to lead ground segment and mission systems software: telemetry ingestion/pipelines, command planning, mission ops tooling, and ground/flight interfaces. Core stack includes Python/C++/Go, streaming systems (Kafka-like), Docker/Kubernetes, cloud, and observability tooling.
Optical Systems Engineer
Designs and develops free-space optical/laser power-beaming systems for spacecraft at Star Catcher, an early-stage space startup building the Star Catcher Network, an orbital power grid, in Jacksonville, FL. Day-to-day work spans optical architecture and detailed design, modeling and simulation, prototyping and testbeds, and lab/field/on-orbit testing alongside multidisciplinary engineering teams.
Senior Software Engineer, Platform Infrastructure
Moonlite builds the infrastructure behind ambitious AI. We design, deploy, and operate high-performance GPU systems for large-scale model training, computational research, and intensive data workloads. We combine…
Senior Software Engineer, Network Platform
Moonlite is hiring a Senior Software Engineer to build its software-defined networking platform for AI infrastructure: designing DPU-accelerated (NVIDIA Bluefield-3) network orchestration, multi-tenant VPC/VXLAN isolation, and high-performance RDMA/RoCE networking for distributed AI workloads. Core stack: Python, Go, Linux networking, Open vSwitch, BGP, Terraform.
Senior Software Engineer, Compute Platform
Moonlite builds the infrastructure behind ambitious AI. We design, deploy, and operate high-performance GPU systems for large-scale model training, computational research, and intensive data workloads. We combine…
Principal Software Engineer
Principal Software Engineer at Highnote, an embedded finance card issuing and processing platform, building secure, compliant payments platform products — mostly in Java — with strong use of AI-powered development tools. Hybrid role based in San Francisco with in-office days Monday–Thursday; salary range $190k–$240k plus equity.
Software Engineering Intern
Astro Mechanica, a venture-backed aerospace startup in San Francisco, is hiring an in-person summer 2027 Software Engineering Intern to own a real project end to end — flight software, simulation, test infrastructure, or internal tools — coding in languages like C++, Rust, or Python and testing on actual flight hardware.
Senior Software Engineer
Builds AI-powered mobile inspection tools for field workers, integrating voice, photos, and reports to automate data collection and decision-making in industrial and infrastructure settings.
Software Engineer
Full-stack engineer at a $10M seed-funded healthtech startup in New York building AI voice agents that complete patient workflows (scheduling, billing, refills) end-to-end. You'd own production features spanning Node/TypeScript, Postgres, React, EHR integrations, and real-time voice infrastructure, working fully in person in NYC.
Senior/Staff Software Engineer, Platform
Platform engineer building internal developer tooling, TypeScript libraries/SDKs, AWS infrastructure as code (Terraform/Pulumi), Buildkite CI/CD with per-PR ephemeral environments, and reliability/observability for an AI-native mortgage loan origination system. Goal is to boost product engineers' shipping velocity at a US fintech startup.
Senior Staff Software Engineer
Architects and leads the Identity & Trust platform for EarnIn, designing secure, scalable systems for authentication, KYC, fraud prevention, and PII protection. Focuses on multi-year strategy, distributed system architecture, and enabling cross-team trust infrastructure while integrating AI/ML guardrails.
Senior Software Engineer
Senior engineer on EarnIn's Developer Experience team building AI-native tooling and agentic workflows (LLM APIs, MCP patterns, GitHub Actions/CI-CD automation) to accelerate how engineers build, ship, and operate software. Remote-friendly, with optional hybrid from the Mexico City office; no visa sponsorship offered.
Staff Software Engineer, Physical AI Orchestration
Senior hands-on IC role at a seed-stage robotics-AI startup: consolidating fragmented orchestration services into one production-grade platform (MothershipOS) that coordinates robots and humans across warehouse sites, while establishing version control, CI/CD, OTA updates, and observability. Core stack: Python, ROS/ROS2, distributed systems, cloud and edge compute.