2,917 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Python Software Engineer Agentic AI
Build Python backend services and JSON REST APIs with a focus on prompt engineering and LLMs, deploying intelligent agents (Claude, ChatGPT) that automate real business tasks alongside a Technical Architect, in a London-based startup-like team.
Software Engineer (F/M) – Stage
Internship ('stage') on Greenerwave's embedded software team in Paris, making C libraries portable across microcontrollers and operating systems for antenna products (RIS, dual-frequency GNSS). Day to day: designing a hardware abstraction layer, porting and validating on multiple platforms, plus automated testing, CI and documentation.
Senior Systems Engineer, Energy Storage
Designs and integrates energy storage systems at a battery recycling startup, balancing mechanical, electrical, and software needs while ensuring performance, safety, and compliance with industry standards.
Team8 Stealth Cyber Startup- Software Developer
Builds and scales a cybersecurity platform from scratch, designing backend/full-stack services, microservices, and distributed systems while collaborating with product and research teams to translate security challenges into solutions.
Founding Engineer - AI | Manufacturing Intelligence
Founding engineer at an early-stage Bangalore startup building AI for manufacturing: systems that read 2D engineering drawings, 3D CAD models and customer requirements, and fine-tuned models supporting quality planning (APQP) and PPAP. Hands-on work with vision/reasoning models, agentic patterns, Python, plus full-stack shipping (backend, DB, basic frontend, deployment).
Founding Software Engineer — Tracy Health
Founding engineer at Tracy Health, an early-stage healthcare startup building a patient-controlled health record and EHR co-pilot for underserved populations. You'll own 0→1 product building: FHIR data unification, field tools for street teams, consent/access controls, and HIPAA/SOC 2 compliance. Equity-only compensation (3–10%).
Sr. Software Integration Engineer
Senior engineer at a genomics sequencing company who builds AI agents and automated workflows for software integration, testing, release, and deployment, plus a queryable knowledge base. Core stack: Python/shell on Linux, LLM APIs and agent frameworks, and integrations with Jira, Confluence, GitHub, Microsoft 365, and Monday.com. Full-time remote (US); SF Bay Area preferred.
Founding Engineer (Equity-First)
Equity-first founding engineer at Thankly, an early-stage startup building branded shopping apps that run inside AI assistants (ChatGPT, Claude, Gemini). You turn the CTO's designs into production features with React, TypeScript, Express, Supabase and Postgres, ship and maintain client apps on AI assistants, and use AI coding tools daily. Paid in equity until revenue milestones.
Founding Software Engineer
Founding full-stack engineer at an early-stage startup building client-intake and decision-support software for law firms. You'll design APIs and LLM-powered workflows, own product areas end to end, and work directly with the founders using Python/FastAPI, React, and PostgreSQL.
Early-Career Software Engineer - SWE-I
Early-career software engineer at an early-stage startup building a greenfield, AI-native platform. Day to day you design and ship backend modules, APIs, and user-facing UI alongside senior engineering leadership, using AI coding tools like Claude Code, Copilot, and Cursor. Pays $115k-$135k plus equity; Irvine-based with remote option.
Software Engineer II - SWE-II
Software Engineer II designing greenfield, mission-critical backend systems from day one — high-throughput services, clean APIs (REST/gRPC), and agentic AI workflows — in payments, treasury, regulated healthcare data, or AI vision. Uses AI coding tools daily, owns services end to end including on-call. Irvine-based, remote-friendly, $135k–$165k plus equity.
Founding Software Engineer — Tracy Health
Founding software engineer at an early-stage healthcare startup building a patient-controlled health record and EHR co-pilot (FHIR-based) for underserved populations. You'll own data unification, consent controls, field-ready mobile tools, and compliance infrastructure (HIPAA, SOC 2, 42 CFR Part 2), shipping fast in a regulated environment.
Sr. Software Engineer, X Money
Builds and scales a global payment network’s backend services, APIs, and microservices for a high-volume financial platform in a fast-paced startup environment.
Member of Technical Staff
AI infrastructure engineer optimizing open-source LLM inference for speed, energy, and cost on heterogeneous hardware: tuning new models, writing CUDA/HIP/Triton GPU kernels, and running production inference clusters. On-site in San Francisco five days a week; $200k-$300k base with visa sponsorship available.
Software Engineer, Infrastructure
Owns Rainmaker's production infrastructure and security end to end — cloud infrastructure on AWS, CI/CD pipelines, observability, identity/secrets, and incident response for 24/7 systems that tolerate lost comms. Core stack includes AWS, Terraform/Pulumi infrastructure-as-code, and Tailscale/WireGuard zero-trust networking; on-site in El Segundo, CA.
Vehicle Software Engineer
Builds the software that operates Rainmaker's cloud-seeding drones — onboard services, mission planning and execution, failsafes, payload/sensor integration, and operator ground stations. Stack is Rust (plus C/C++), React/TypeScript in Electron, PX4 over MAVLink, on Linux, taken through simulation, flight testing, and field support in El Segundo, CA.
Senior Software Engineer
Build security solutions for GenAI and Copilots, design scalable Big Data pipelines, and own features end-to-end at an AI agent security company using modern programming languages and cloud platforms.
Founding Software Engineer
Founding software engineer at Simantic owning the full product development lifecycle — architecting software from UI/UX through cloud deployment pipelines (AWS/GCP/Azure) and working directly with customers on on-site deployments. Stack spans C/C++/C#, TypeScript/React, and Python, with embedded firmware work (Cortex-M/RISC-V).
Python developer in fintech
Lead a small tech team as a hands-on Python Developer/Team Lead at a profitable FinTech start-up, splitting time roughly 50/50 between architecture/design and people management. You'll build features and refactor a young core banking platform that integrates with HSBC, using Python, FastAPI and GCP in a hybrid Central London role.
Software Engineer, Implant
Develops and maintains software/firmware for Neuralink’s brain-interface implants, including SDKs, manufacturing tools, and monitoring systems, bridging hardware and software for medical applications.