2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer, Inference Systems
Builds and optimizes the model-serving runtime behind River's AI API — request scheduling, continuous batching, KV-cache management, and multi-GPU execution — to deliver fast, reliable, cost-efficient inference for large transformer models and RL sampling workloads. Core stack: Python, C++/Rust, CUDA, and frameworks like vLLM/SGLang/TensorRT-LLM.
Software Engineer, River API
Systems engineer at River AI building the high-performance distributed infrastructure that trains its personal-AI models — writing custom GPU kernels, profiling end-to-end, and scaling clusters of thousands of nodes. Core stack: C/C++/Rust, GPU architectures, InfiniBand/RDMA, and frameworks like PyTorch/JAX.
Lead Systems Engineer
Staff/principal-level systems engineer (second SE hire) at Queue, an autonomous robotic pharmacy startup. You partner with the Head of Systems Engineering to own system safety (SOTIF, STPA/FMEA/FTA), regulatory strategy, and system architecture for a fully autonomous medication-dispensing robot scaling from pilots to fleet.
Python Developer
Build backend systems and production-grade autonomous AI agents at Ellow's Agentic AI team, working with Python, LLM orchestration frameworks (LangChain, LlamaIndex, CrewAI), AI APIs (OpenAI, Anthropic, Hugging Face), vector databases, and microservices.
Senior Software Engineer
Senior full-stack engineer at Mural Pay, a Series A company building regulated cross-border payment infrastructure (fiat + stablecoins) across the US and Latin America. You'll build payment systems — state machines, transaction pipelines, reconciliation — with Node/NestJS and React/TypeScript, onsite in NYC or Denver.
Founding Engineer
Founding engineer at an applied AI research startup building production safety and evaluation tooling for AI systems used in regulated financial workflows. Day to day: turn research prototypes into production guardrails, make architecture decisions, and build core infrastructure while onsite in San Francisco five days a week.
Founding Software Engineer
Founding Software Engineer at an industrial-technology startup in Los Angeles, owning full-stack software (TypeScript with Python or Go) for factory operations — supply chain, quoting, inventory, automation, and simulation tools — working onsite five days a week with hardware and automation engineers.
Senior Software Engineer
Senior Software Engineer at IOMETE builds core platform infrastructure for its enterprise data lakehouse — Kotlin, Go, and Python microservices plus Kubernetes extensions (CRDs, webhooks, control-plane components) — for petabyte-scale Spark workloads, working directly with customer engineering teams. Full-time remote contract role paying $60k–$100k.
Software Engineer, Cloud Infrastructure
Cloud infrastructure engineer (one of ~10) at Safari AI, an early-stage computer-vision startup serving physical-economy enterprises. Day to day you build and own the cloud infrastructure, set its technical direction, and ship and maintain reliable production services on AWS/GCP/Azure.
Software Engineer
Builds a utility-as-API platform that lets companies embed branded electricity plans; works across APIs, UI components, load forecasting, and grid control.
Senior Software Engineer, Rips (Web)
Be the first dedicated web engineer bringing Rips, Triumph's fast-growing collectibles app, to the web as a greenfield build. You'll own the web platform end to end — architecture, component patterns, state management, and performance — on top of existing backend APIs, working in person at the San Francisco HQ.
Software Engineer - Parsing (Principal/Staff/Senior)
Engineer on AllSpice's parsing team, which builds the foundational data model, SDKs, and parsers underlying a collaboration/CI-CD platform for electronic circuit designs (like GitHub for hardware). Day to day you design data interfaces with other teams and write Rust parsers and tooling for ECAD file formats.
Senior Software Engineer, Voice AI
Senior engineer (#7) joining a seed-stage GovTech startup building an AI voice-agent platform that triages and automates 911/311 emergency calls. Day to day: design event-driven, low-latency backend systems, audio-processing pipelines, and LLM integrations, using Python, Go, Elixir, Azure, and LiveKit. Remote across North America.
Senior Integration Engineer
Designs the architecture for a next-generation stellarator fusion power plant, integrating plasma physics, magnets, cryogenics, and controls while balancing performance, cost, and engineering trade-offs.
Software Engineer, Product (Integration Platform)
Fullstack product engineer on Lovable's Integrations Platform in Stockholm, building the connectivity layer that lets millions of AI-built apps and agents access third-party services and LLM providers. Work spans React frontend, Golang/Rust backend services, and cloud infrastructure on Cloudflare, GCP, and AWS.
Senior Software Engineer
Senior Software Engineer at an early-stage, stealth AI data-infrastructure company (~30 people) building data-production pipelines for frontier AI labs. Day to day: end-to-end full-stack TypeScript development, owning architecture, leading a small pod of engineers, and using AI coding tools like Cursor and Copilot daily.
Member of Technical Staff - Prime Agent
Generalist software engineer on the Prime Agent team building an open-source coding and research agent, owning features end-to-end from design through deployment. Core work spans TypeScript and Python product development, agent systems, dashboards, and real-time asynchronous infrastructure, done in person in San Francisco.
