2,914 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Jr. Software Engineer
Fully remote junior software engineer at Optimum, a Web3 startup building a blockchain data acceleration network powered by RLNC. You'll prototype product ideas with the CTO and CPO, benchmark them against competitors, and iterate quickly using full-stack skills (Go, React/TypeScript) and AI coding tools like Claude Code and Cursor.
Software Engineer – Mission Control Software
Develop mission-critical Mission Control Software and supporting tools for flight controllers and engineering teams at an aerospace company, primarily using Python and/or Ruby on the backend with modern JavaScript frameworks on the frontend, building scalable distributed systems for real-time data processing.
Application Developer - Power BI React
Permanent role at a London-based AI customer-growth analytics platform: maintain existing client Power BI/DAX reports while building the new AI-enabled web application layer (React front end) that replaces them, migrating clients across and working with client IT/security teams. Based in Holborn four days a week; £75,000 plus benefits.
Software Engineer (New York City, NY)
Onsite Software Engineer at a $5M-funded NYC startup that helps brands measure and improve their visibility across AI search platforms. You'll own product surfaces end-to-end — designing large-scale systems, data models, and infrastructure — from the company's SoHo office.
Sr. Software Engineer (San Francisco, CA)
Senior engineer at Baselayer (SF, hybrid) building a cryptographic 'Know Your Agent' identity substrate for AI agents — owning pieces like the OAuth token issuer, sub-millisecond edge JWS verification, or the Passport account system. Hands-on in a Python 3.13/FastAPI monorepo with Go for performance-critical components.
Software Engineer (New York City, NY)
Full-stack software engineer at Rubie, a well-funded startup building agentic AI infrastructure that helps ERP/CRM vendors configure and launch with their customers faster. You'll work across frontend, backend, and some DevOps (React, Remix, TypeScript, AWS, Cloudflare) from the NYC office five days a week.
Forward Deployed Software Engineer
First US-based Forward Deployed Engineer at a seed-stage agentic-AI commercial lending fintech: partner directly with customers on implementations, build custom solutions with Python, React, APIs and LLMs, debug production AI workflows, and help shape engineering culture. Remote within the US, reporting to the Co-Founder & CEO.
Founding Engineer
Founding engineer at Nerve, an early-stage AI startup building AI knowledge workers that help scaling companies answer questions, draft emails, and write docs. You'll take end-to-end ownership of major projects alongside the founders, full-stack across Python, React/Next.js, AWS, and Kubernetes, working in person in San Francisco 4 days a week.
Customer Integration Engineer
Customer-facing engineer who owns technical onboarding of enterprise customers to Cerrion's industrial AI platform: guiding networking, connectivity, authentication, and security reviews, and joining sales calls as the technical voice. Based at the Zurich office; core stack is networking, IT security, and documentation.
Software Engineer
Software engineer on a small Glasgow team building C++ real-time control, embedded, and web-service software for autonomous drones (UAS) in aerospace — working across edge flight control, data storage/processing infrastructure, secure local and internet data links, and user-facing operator software.
Research Fellow - Robotics Software Engineer
BeeX is hiring a Robotics Autonomy Software Engineer (Research Fellow) to design, test, and validate perception and autonomy algorithms for hovering autonomous underwater vehicles used to inspect submerged infrastructure. Core work involves anomaly detection from sonar/camera sensor data using Python/C++, ROS, machine learning, and 3D vision.
Chief Technology Officer
ActAI, an early-stage company building AI-native, agent-first mobile communication apps, is hiring a CTO to own technology strategy, architecture, and engineering standards across the group — reviewing code, systems, and incidents hands-on while recruiting senior engineers. Core areas: backend systems, APIs, databases, cloud infrastructure, distributed systems.
Senior Ground Systems Engineer (m/f/d)
Senior Ground Systems Engineer at Rocket Factory Augsburg designs, develops, and commissions ground support infrastructure (fluid, mechanical, and process systems) for rocket test and launch facilities, owning systems from concept through operations. Core work involves pressure/fluid engineering, P&IDs, safety analyses (HAZOP/FMEA), and 3D CAD in Siemens NX.
Systems Engineer (m/f/d)
Systems Engineer at Rocket Factory Augsburg (RFA) who develops and maintains requirements, architecture, and verification/test cases for expendable and reusable launch vehicles and ground systems, coordinating across vehicle, propulsion, software, avionics, and ground teams. Core skills include systems engineering, Python tooling, and requirements/risk analysis (FMECA/FTA).