2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer, Developer & Research Platform
Builds the internal developer and research platform at Chai Discovery: improving coding agents, development environments, testing and deploys, plus a platform where researchers and AI agents run and compare experiments. Core focus is systems engineering and developer tooling supporting frontier AI models for drug discovery.
Founding Lead IT Engineer
Founding Lead IT Engineer who owns and builds the entire IT and security function at a stealth space hardware startup: identity, endpoints, networks, cloud tenants, and a CMMC 2.0 Level 2 / NIST SP 800-171 / DFARS / ITAR compliance program. A hands-on leadership role spanning architecture, day-to-day IT, security operations, and team building.
Founding Lead Systems Engineer
Founding Lead Systems Engineer at a stealth space-hardware startup in Los Angeles: own the full spacecraft technical baseline — mission architecture, requirements, interfaces, budgets, and verification — while building and mentoring the systems engineering team. Requires deep spacecraft systems engineering experience and U.S. person status (ITAR).
Founding Lead Test & Integration Engineer
Founding lead role owning spacecraft assembly, integration and test (AIT) at a stealth space-hardware startup: define the verification strategy, run environmental and vehicle-level functional test campaigns, build EGSE, flatsat and test-automation infrastructure, and lead launch site operations while hiring and mentoring the I&T team.
Database Developer / Lead Database Engineer
Leads the architecture and ground-up build of engine-level database technology — storage engines, distributed consensus, transactions, and query optimization — writing low-level systems code in C++/Rust/Java at an Industrial AI startup. Day to day: engine design, performance tuning, distributed reliability work, and mentoring.
Staff Fluid Systems Engineer
A senior engineer owns Kaleidos microreactor fluid systems (primary loop and power conversion loop) end to end — from trade studies and thermal-hydraulic analysis through piping design, vendor development, assembly, and testing. Core toolkit: fluid dynamics, thermodynamics, heat exchanger design, FEA/hand calculations, and ASME piping codes.
Senior Fluid Systems Engineer
Senior Fluid Systems Engineer at Radiant Industries will own Kaleidos microreactor fluid systems (primary loop and power conversion) from design through build and production, doing trade studies, thermal-hydraulic analysis, piping design, vendor development, BOM management, and testing. Core skills: fluid dynamics, thermodynamics, heat exchangers, FEA, and Matlab/Python modeling.
Senior Software Engineer, Platform
Senior platform engineer building the cloud infrastructure behind an early-stage software product: designing scalable distributed systems, data pipelines, CI/CD and observability, using Go, Kubernetes, Terraform, and GCP/AWS/Azure.
Web Developer
Owns Ivo's high-traffic marketing website end to end — architecture, Next.js development, performance, A/B experimentation, server-side ad tracking, and CRM integrations — leading the migration from Webflow to a code-based stack and building AI-assisted publishing tooling alongside marketing and design.
Flight Software Engineer
Designs and maintains embedded flight software for satellites, integrating and testing systems in simulation and hardware environments to ensure mission success in space.
Lead Flight Software Engineer
Lead the development of flight software for a next-gen space architecture startup, designing real-time, fault-tolerant systems in C/C++/Rust for spacecraft control, autonomy, and safety.
Senior Real-Time/Controls Software Engineer
Develops real-time control software for high-speed aerospace systems, translating MATLAB/Simulink models into embedded C/C++ for motor control, safety interlocks, and hardware-in-the-loop testing in a fast-paced startup environment.
System Engineer - Safety / Fault Protection
Engineer spacecraft safety and mission assurance for a dual-use space-tech startup, analyzing hazards, fault protection, and risk controls to ensure reliable space vehicle operations.
Systems Engineer
Designs and oversees the full lifecycle of spacecraft systems for a dual-use space-tech startup, using systems engineering principles and MBSE tools to ensure mission success.
Software Engineer (H/F) - Stage - Paris
Internship (stage) as a Software Engineer at Wiremind in Paris, building new features for one of its SaaS transport products — PAXONE (rail reservation system) or CAYZN (ML-driven revenue management). Day-to-day coding with senior mentorship using Python (Flask/FastAPI), TypeScript/Angular, PostgreSQL, and Kubernetes.
Software Engineer
Software engineer (backend, frontend, mobile or full-stack) at REVEL, a Spanish scale-up offering 100% online car renting/subscription. Day to day: build and evolve web, mobile apps, APIs and an internal ERP for fleet management, payments and automations, integrating Stripe/Hubspot, using TypeScript, React/React Native, MongoDB/PostgreSQL and Redis.
Staff Software Engineer
Staff Software Engineer at Assured in New York City (in-office) who architects and builds the company's AI/ML infrastructure: a workflow orchestration engine and LLM/rules-driven digital workers automating healthcare operations like credentialing and enrollment, while mentoring engineers and partnering with product and customers.
Lead Controls Software Engineer
Lead the development of PLC software for a rail microgrid that autonomously charges battery locomotives, integrating energy assets like solar, BESS, and chargers using CODESYS and IEC 61131-3.
Senior Software Engineer (Voice AI)
Taxo is hiring a Senior Software Engineer (Voice AI) in New York City to build and operate real-time voice agents that handle healthcare admin tasks like patient intake, scheduling, and prescription refills. The role owns voice-runtime services across speech recognition, LLMs, speech generation, and telephony, using TypeScript/Node.js, React/Next.js, PostgreSQL, and AWS.