2,917 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
DeFi Web Developer with React and Node Skills in Paris
Full-stack developer building the MVP web application for a decentralized options trading network (DeFi), working directly with the startup's co-founders in a Paris onsite role. Core stack is React, Node.js and TypeScript, with required Solana/Ethereum blockchain experience and Next.js preferred.
Software Engineer (Go) (Open Talent Pool)
Remote (Spain-based) backend engineer at Agentero, a Series A insurtech startup modernizing insurance distribution via Producerflow. Ships Go backend services and REST/gRPC APIs end-to-end, builds testing and observability for 99.9% uptime, and uses AI dev tools (Claude Code, Cursor). 50–80K EUR + equity.
Senior Node.js Developer
Senior backend engineer building Node.js services for EV Digital, a Hamburg-based digital real estate broker. Fully remote within Germany, the role covers API design, server-side logic, security, and end-to-end ownership of low-latency, high-availability applications.
Python Software Engineer Agentic AI
A Python engineer builds backend code, REST APIs and intelligent AI agents, focusing on prompt engineering and integrating LLMs like Claude and ChatGPT into robust, commercially valuable workflows. Based in London with one day a week work-from-home.
Senior Software Engineer
Senior Software Engineer at Constantinople, a Sydney company building an AI-native banking platform for banks. You design and deliver core platform features end-to-end — architecture through production — using Node.js, TypeScript, and serverless AWS, while driving engineering standards and mentoring others.
Principal Software Engineer
Principal full-stack engineer at a scaling healthcare AI company serving payers and providers, building secure, scalable web apps for a government department. Leads architecture end to end — React/Next.js front end, Python or Node back end, cloud infra — and integrates LLMs and autonomous agents; primarily remote with occasional DC attendance. US citizenship and clearance eligibility required.
Software Engineer
First full-time software engineer at Gale (YC W25), an immigration-tech startup helping US businesses get work authorization for employees. You'll build AI/LLM-powered internal tools for immigration lawyers, owning features end to end across the stack using TypeScript, React, and Effect TS.
Lead Software Engineer
Cape Town-based hands-on team lead role at an international tech startup: ~70% writing and reviewing production Java 17+/Spring Boot microservices on AWS, ~30% leading a small team (planning, coaching, code review standards, delivery ownership). The client expects heavy, critical day-to-day use of AI tools like Claude.
Member of Technical Staff, Offensive Cyber
Offensive cyber role at Enclosure, a superintelligence security lab: develop novel CNE tools, rootkits, and techniques to steal/compromise AI model weights in order to test and harden defenses protecting data centers and AI models. Suited to an experienced offensive cyber researcher; San Francisco or remote.
Engineering Manager
First Engineering Manager at Pythagoras AI, an early-stage company building LLM-based conversational AI products for healthcare. Mostly people and delivery leadership — managing engineers, driving customer rollouts and product roadmap, coordinating with clinical stakeholders — while staying hands-on with TypeScript/Node.js.
Senior Mission Software Engineer
Builds and operates Varda's ground segment software for spacecraft missions: telemetry ingestion and distribution, commanding, mission control UIs, and simulation/test automation, plus the platform (CI/CD, IaC, deployments) behind it. Primarily Python with Docker/Kubernetes, working hands-on with flight software, avionics, and mission ops on-site in El Segundo, CA.
SaaS Implementation & Java Engineer - Hybrid/Remote
Technical Implementation & Software Engineer at an early-stage startup building cloud-based SaaS for the renewables sector: roughly 60% customer-facing SaaS implementation and 40% hands-on Java development, working hybrid from Cambridge or remotely within the UK.
Founding Engineer at HeaviAI
Founding engineer (one of the first hires) at an early-stage AI startup applying voice/agent AI to heavy-equipment repair knowledge. In-person in San Francisco: own features end-to-end, work directly with customers, and build with tools like Pipecat, Vapi, Browserbase, and Vercel AI SDK.
Principal Avionics Systems Engineer
Responsible Engineer for avionics system design, analysis, testing, and integration on K2 Space's large, high-power satellites, with focus areas in spacecraft charging, radiation, EMI, and RF. The role spans design trades, flight hardware qualification, production test infrastructure, and test/automation software in Python and Rust.
Senior Flight Software Engineer
Develops and verifies real-time, fault-tolerant flight software for high-power satellites using Rust, C++, and Python, controlling propulsion, attitude, and power systems.
Flight Software Engineer
Develops and verifies real-time, fault-tolerant flight software in Rust for high-power satellites, including propulsion, attitude control, and power systems, with launches planned through 2027.
Principal Flight Software Engineer
Principal Flight Software Engineer at K2 Space in Los Angeles designs and implements real-time, fault-tolerant control software for high-power satellites using Rust, C++, and Python, with responsibilities spanning architecture, subsystem integration, and on-orbit operations.