2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer, Product & Platform
Full-stack engineer building core product and platform systems at Adaptive Security, a cybersecurity startup defending against AI-powered attacks. Day to day you ship end-to-end features across backend services, detection pipelines, and user-facing UIs using Java/Spring Boot, TypeScript, React, PostgreSQL, and AWS, working on-site in NYC five days a week.
Software Engineer, Autonomy
Designs and owns the autonomy architecture for large-scale drone swarms, including perception, planning, and control systems, using C/C++, Rust, or Go.
Mission Integration Engineer Internship (Spring or Summer 2027)
An engineering student internship (starting March or June 2027) on Apex's Mission Integration team in Los Angeles, supporting system-level mission planning for satellite buses: mission architecture, orbital mechanics trade studies, technical budgets, requirements verification, and documentation. Python/MATLAB/STK/GMAT familiarity preferred; U.S. Person status required (ITAR). Pays $45/hour.
Software Engineer Intern
Software Engineer Intern at Golden Analytics will ship production features for the company's data analytics product — dashboards, visualizations, data prep, and AI-powered tools. Requires JavaScript/TypeScript with React, Git, and hands-on use of AI coding tools; full-time, on-site in Bellevue, WA Mon–Thu for 10–12 weeks in Summer 2027.
Senior Software Engineer
Senior Software Engineer at Sonio (Paris, on-site) building the plumbing that connects its AI fetal-ultrasound assistance product to the outside world: scaling data ingestion, refactoring DICOM ingestion, and integrating with ultrasound machines and EHR systems. Expect systems/backend work in near-real-time across edge software, cloud streaming, and reactive web apps.
Software Engineer III, Cloud
Nimble Robotics, an AI robotics startup building autonomous supply-chain warehouses, is hiring a Software Engineer III (Cloud) in San Francisco. The role ships features end to end across frontend, backend, CI, and AWS/Kubernetes infrastructure, with testing, performance debugging, production support, and mentoring junior engineers.
Software Engineer
A software engineer building BlazerOps, an MLOps platform for a spatial AI research lab — working across pipeline orchestration, experiment tracking, storage, the Python SDK, and CLI/web tooling. Core stack is Python plus a compiled language (Go/Rust/C++), distributed systems, and cloud infrastructure (AWS/GCP).
Senior Software Engineer
Senior engineer at an early-stage, remote-first data platform startup, splitting time between the open-source Moose framework and its Boréal hosting platform. Full-stack work across frontend, backend, and the framework itself, with a core stack of async Rust and TypeScript.
Software Engineer
Software Engineer at Quell, a UK defence and security AI start-up near Cambridge, building software that counters drone, vehicle, and human threats — from early prototypes to production products. Hands-on full-lifecycle work in Python with hardware/embedded interfacing, networking, and deep learning (TensorFlow/PyTorch), five days a week on-site.
Software Engineer
Software Engineer building a quantum orchestrator — primarily C#/.NET worker services that interface directly with external quantum hardware — while automating deployments on clean Ubuntu environments with Docker and systemd and establishing CI/CD workflows in a small, fast-moving deep-tech team.
Software Developer - Intern
An internship for penultimate-year students to write high-quality code and gain hands-on software development experience.
Member of Technical Staff | Quantitative Finance
Poesis, an AI-native investment firm, is hiring a Member of Technical Staff (Quantitative Finance) to turn financial research into production systems — preparing large financial datasets, building models and agents, and creating scalable backtesting and evaluation tooling that inform live investment decisions.
Member of Technical Staff | Agentic AI
Experienced software engineer to build Poesis's agentic AI platform for investing: designing scalable agent architecture, agent-driven investment workflows, and evaluation/observability systems that keep frontier-model agents reliable in production. Hybrid role, 3 days/week on-site in Menlo Park.
Senior Software Engineer
Senior Software Engineer on Gigaton's Platform team in London, building reliable infrastructure for AI systems that optimise heavy industrial plants and cut carbon emissions — spanning CI/CD for a monorepo, IoT/on-prem data integration, and software around their control systems. Core stack is Python and Terraform.
Software Engineer, Agentic Pipeline Generation (Staff+)
Staff engineer at Lightfield, an AI-native CRM startup in San Francisco, building agentic pipeline generation: systems that ingest and enrich company/people data, discover prospects, and automate outreach with AI agents. Full-stack work across TypeScript, React/Next.js, Node.js, GraphQL, and PostgreSQL with end-to-end product ownership.
Senior Flight Software Engineer
Owns major flight software subsystems for Poseidon's autonomous cargo aircraft — from architecture and deterministic real-time embedded C++ implementation through simulation, hardware integration, and flight test. Requires 5+ years of C/C++ on embedded, real-time, or safety-critical systems.
Software Engineer – Gap Year
A 12-month, full-time software engineer role for college students taking a gap year, building full-stack features for Netic's AI platform end-to-end (React, TypeScript, Python, LLM APIs) in person in San Francisco or New York, with a mentor, full salary, equity, and covered housing.
Software Engineer Intern
Six-month full-time internship at startup Fask, building AI agents and AI-native applications directly with the co-founders. Day-to-day is full-stack development (TypeScript, Node.js, React, NestJS, Python, Postgres, MongoDB) with cloud deployment on AWS/Azure/GCP; pays INR 5,000-8,000/month with a chance to convert to full-time.