2,917 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Senior Software Engineer, Enterprise Applications
Build full-stack web apps and backend services for next-gen space stations, using React, Node.js, GraphQL, and SQL databases.
Systems Engineer
Systems engineer at Thea Energy, a fusion energy startup in Kearny, NJ, developing stellarator-based fusion power. The role manages requirements, interfaces, configuration control, and integration of first-of-a-kind technologies across mechanical, electrical, fluid, cryogenic, vacuum, and control systems.
Software Engineer Specialist (AI Product)
Remote (PJ contract) senior hands-on engineer for a B2B AI SaaS that combines a software marketplace, AI model routing across 500+ models, and AI agents. You own architecture and LLM evaluation/cost controls while writing critical code in Python, TypeScript, Next.js/Node.js on PostgreSQL/Supabase.
Senior Software Engineer
Builds and evolves a quantum execution platform by designing quantum algorithms, optimizing backend integrations, and improving the execution system for scalable quantum simulations.
Software Engineer (AI Focused)
Full-stack software engineer (AI-focused) at startup studio RYZ Labs: builds production features and scalable APIs with Node.js/Python/Java, touches frontend (React/Vue), and integrates AI/LLM tools into apps. Long-term hybrid role — 1 day/week at a Palermo (Buenos Aires) coworking space.
Staff Software Engineer
Senior/Staff Software Engineer (Data Platform) at an early-stage AI marketing-optimization startup. Day to day: own backend services and data pipelines end-to-end in Python/TypeScript on GCP/AWS, ingesting CRM, web, ads, and product data into warehouses like BigQuery/Snowflake to power ML systems, analytics, and customer-facing products.
Founding Engineer, Agents
Founding engineer building autonomous AI agents that complete complex computer-based work over long periods with minimal human oversight — owning agent execution, memory systems, and evaluation frameworks benchmarked against human baselines. On-site in San Francisco; $200k–$350k base plus founding equity.
Founding Engineer, Environments + Data
Founding engineer at Clera building AI-agent evaluation environments, benchmarks, and graders — designing synthetic company setups (emails, records, simulated inboxes/CRMs) and detecting reward hacking. Research-oriented, on-site 5 days/week in San Francisco; base $200k–$300k plus up to $200k+ performance bonus and founding equity.
Senior Software Engineer
Senior Software Engineer building full-stack internal platforms and tools that power reactor design, fuel manufacturing, licensing, and plant operations for an advanced nuclear energy startup.
Senior Security Software Engineer
Senior software security engineer at a nuclear energy startup who embeds security across the SDLC: threat modeling designs up front and performing secure code review of the C#, Python, React, and Postgres stack, plus supporting CMMC 2.0 alignment. Onsite in Torrance, CA; $175k-$200k plus equity.
Founding Engineer, NLP Systems & Infrastructure
First technical hire at an early-stage AI/deep-tech startup in Munich, building production NLP and data pipelines, AI/ML integrations, and cloud/on-prem deployment in Python, PostgreSQL, and vector/graph stores, then hiring and leading the engineering team.
Senior Test Engineering Manager
Leads Amperesand's test engineering team, owning manufacturing test and product validation of high-voltage Solid State Transformer power electronics from prototype through volume production. The role runs the test lab and test system uptime and partners with EE, ME, firmware, and program management. Onsite in San Francisco.
Senior Software Engineer
Senior full-stack engineer at PolicyMe, a Toronto-based, remote-first insurtech startup, building AI-powered web products that automate insurance broker processes. Works across Python, React, Redux, PostgreSQL, LangChain/LangGraph and AWS, leading AI/ML architecture and mentoring engineers.
Senior Software Engineer, Customer Platform
Senior backend engineer on Chainguard's Platform team, designing and building customer-facing backend services and public APIs (notifications, authentication, next-gen public APIs) end to end in Go on cloud-native/Kubernetes infrastructure, partnering with product and front-end teams in a remote startup environment.
Инженер-программист
Software engineer position at a growing R&D company based in Moscow, working on-site with a monthly net salary of 150,000-250,000 RUB. The posting provides no details about responsibilities, tech stack, or requirements.
Staff Software Engineer
Lead architecture and development of software for a nuclear-energy platform, ensuring reliability and safety in a regulated environment while leveraging AI and modern tooling.
Spring 2027 Software Engineering Intern
A six-month Spring 2027 software engineering co-op in Washington, DC (on-site five days/week) building NOS, the Nuclear Operating System used to run nuclear reactor construction. Interns take real scope on product, platform, or data squads, shipping production features including LLM/agent-backed AI capabilities and integrations with Palantir Foundry and AWS GovCloud.
Summer 2027 Software Engineering Intern
12-week Summer 2027 software engineering internship in Washington, DC building features for NOS (Nuclear Operating System), the software behind reactor construction, across product, platform, or data squads — including LLM/agent-powered features and integrations on Palantir Foundry and AWS GovCloud. On-site five days a week, with housing and relocation support.
Senior Software Engineer
Senior Software Engineer at The Nuclear Company designing, building, and maintaining safety-critical software for next-generation nuclear reactors, including mentoring engineers, integrating with physical systems, and meeting nuclear regulatory quality standards. Day-to-day work centers on JavaScript/TypeScript or Python development, full SDLC practices, Git, testing, and documentation.
C++ Developer
Sentrycs is hiring a Senior C++ Developer in Tel Aviv to build the application, control, and communication layers of its counter-drone embedded unit, which detects, tracks, and safely lands unauthorized drones. The role involves end-to-end design and implementation in C++ (OOP, multi-threading) on Linux in a fast agile environment.