2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Senior / Staff Software Engineer (AI Agents)
Designs and builds the large-scale, event-driven backend systems behind Actively AI's go-to-market AI agents, which reason over streaming customer data, orchestrate long-running multi-step workflows with humans in the loop, and execute next-best actions reliably. Core stack involves Python, Kafka/Pub/Sub-style streaming, Temporal-like workflow orchestration, and relational, in-memory, and vector d
Member of Technical Staff - Post-Training
Founding engineer focused on post-training at Ghost, an applied AI startup building personal agents. You'd tackle unsolved problems in agentic systems day to day — including prompt-driven work for 12+ hours a day — on a small, well-funded founding team in San Francisco.
Software Engineer (Early Career) – C++ & Systems
Early-career software engineer building and maintaining the real-time data pipeline behind SirenOpt's manufacturing sensing platform: acquiring sensor data, processing and storing it on Linux systems, and delivering it to customer applications. Work is primarily modern C++ (C++17/20) and Python, with hands-on testing on real lab hardware.
Software Engineer, Algorithms & Infrastructure
Software engineer on Base Power's Markets team in Austin builds and automates decision infrastructure for a distributed battery fleet — simulators, statistical models, and algorithmic trading-strategy systems for battery dispatch and energy market participation. Core technologies include cloud AI/ML and HPC infrastructure, MLOps, and ML methods like model-predictive control.
Software Engineer Generalist
TypeSafe AI, a San Francisco AI lab building 'System One Models' that combine LLMs with code for reliable decision-making, is hiring open-scoped Members of Technical Staff across any engineering discipline. The role emphasizes end-to-end ownership, first-principles problem solving, and 5+ years of experience, working fully in-person in SF.
Space Robotics Software Engineer at Phenix Space
Phenix Space is hiring a software engineer to write flight and embedded software for its in-orbit robotics systems — real-time control loops, firmware, sensor fusion, and fault management — in C/C++ and Python. The role spans architecture, hardware integration, and testing from simulation through hardware-in-the-loop to flight, with work flying to space within the first year.
Mechanical Systems Integration Engineer
Physically integrates sensors, compute, and actuators onto autonomous construction machines — designing brackets, enclosures, and routings, supporting prototype builds, and validating for vibration, dust, and weather. Core tools are 3D CAD (Onshape/SolidWorks/CATIA/NX), GD&T drawings, and first-order structural/thermal analysis.
Founding Engineer
First engineering hire at a seed-stage, venture-backed AI startup building an AI sales platform for home-services technicians. The engineer owns full-stack feature development (Python, TypeScript, AWS) on a live product, with roughly 70% heads-down coding and 30% in-person customer work, based in New York City six days a week.
Founding Engineer
Third engineering hire at an AI startup building LLM agents for leaders of institutions (mayors to CEOs). You'll own features end to end across Python, React, and AWS, build AI agents on LangChain/LangGraph, and work directly with customers, in person from San Francisco (SoMa).
Founding engineer
First engineering hire (Head of Engineering) at an early-stage, AI-native fintech in São Paulo building generative-AI-powered corporate banking. You build the core platform end to end — ERP and banking-API integrations, payment-approval agents, data layer, evals and guardrails — with Python/FastAPI and TypeScript/Next.js. PJ contract with fixed pay plus equity.
Data Acquisition Software Engineering Co-op
A software engineering co-op on Zus Health's Data Acquisition team, building and operating production data pipelines that collect, transform, validate, and enrich healthcare data using Go (with some Python) and AWS services like Lambda, DynamoDB, and S3. Hybrid role based in Boston, running January through early June.
Senior Systems Engineer
Senior Systems Engineer at Gravitics supporting its commercial spacecraft program end to end — from architecture and requirements development through integration, test, launch, and mission operations. Day to day involves writing specs and ICDs, driving cross-subsystem integration (structures, propulsion, avionics, thermal), and supporting design reviews, V&V planning, and human-rating work.
Senior/Staff Software Engineer - C++
Designs and optimizes high-performance, multi-threaded modern C++ (C++17/20) systems software on Linux for SirenOpt's manufacturing intelligence platform, profiling CPU/memory/storage/networking/I/O, debugging issues across software-hardware boundaries, and maintaining Python automation tooling. On-site in San Leandro, CA, collaborating with firmware, hardware, and application teams.
Senior Java Engineer - Oasis
Build and maintain PaaS backend services for 01.AI's agent sandbox infrastructure (Oasis): integrating sandbox, workspace, workflow, and toolbox modules; managing cloud sandbox sessions, APIs, tenancy, permissions, and billing; and optimizing performance in high-concurrency production. Core stack: Java (or Go), Spring Boot/Cloud, Docker, PostgreSQL/MySQL.
Senior C#/.NET Developer
Senior C#/.NET developer builds and maintains blockchain-related applications using C#, ASP.NET Core, and Entity Framework in a FinTech startup.
CAD Graphics Engine Software Engineer
Zoo is hiring a Graphics Engine Software Engineer to build the core of its cloud-native, GPU-optimized CAD engine for hardware design — developing B-Rep/NURBS modeling and topological algorithms plus rendering code, working with Graphics APIs and GPU computing in a small startup team.
Senior Software Engineer, Cloud Infrastructure
Senior engineer owning the reliability, automation, and evolution of Zoo's cloud infrastructure behind its cloud-native CAD platform for hardware design. Day to day: backend/infra/systems work in Rust across distributed services, data pipelines, IaC, observability, and integrations, with occasional frontend fixes.
Senior Systems Software Engineer
Zoo is hiring a Senior Systems Software Engineer (Los Angeles or remote) to own the reliability, automation, and evolution of the core systems behind its cloud-native CAD/AI hardware design platform. The work is backend, infrastructure, and systems-level engineering in Rust, spanning databases, distributed services, observability, IaC, integrations, and occasional frontend fixes.