2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer (Java) - Store
Builds scalable, customer-facing grocery shopping features like personalized meal planning and loyalty programs using Java, TypeScript, and modern cloud-native tools.
Senior AI Systems Engineer, Agents
Hands-on senior IC at Fig Security owning their production AI agent used by security analysts and detection engineers — evolving it from a single-agent to multi-agent architecture, building its evaluation/quality platform, and ensuring reliability and safety inside enterprise security environments. Core stack: LLM agents, backend/distributed systems, eval harnesses, CI.
Experienced System Engineer
System engineer at NewPhotonics, a fabless semiconductor startup building silicon-photonics optical interconnects for data centers and AI clusters. You define cross-domain architecture spanning optics, electronics, mechanics and thermal, model and simulate systems, build lab test setups, and drive photonic IC integration through to production.
Senior Python Software Engineer
Senior Python engineer at MazeBolt (Ramat Gan, on-site) helping build RADAR, its patented DDoS vulnerability management platform. Day to day: writing high-quality Python, driving code-quality standards and architecture, solving scale/performance problems, and joining on-call rotations. Core stack: Python, Django, relational databases, cloud, and networking.
Software Engineer - Cable
Early-stage engineer at Cable, an Australian battery-backed electricity retailer, owning products end-to-end — from product design and data modelling to backend architecture and security — on a serverless TypeScript/React/Postgres stack, with AI coding agents central to the development workflow.
Software Engineer
At Brumby, a YC-backed startup building autonomous drones that herd and monitor cattle, this Software Engineer owns the cloud/edge platform end to end: AWS infra as code, a Python/FastAPI backend, TypeScript/React and Electron apps, plus offline-first sync and OTA updates for the drone fleet. Based in Sydney with field deployments to cattle stations.
Software Engineer (Modeling)
Software Engineer building Stream.Security's cloud topology analysis platform: modeling cloud infrastructures (compute, networking, Kubernetes, IAM) to help security teams detect and respond to threats in real time. Core work involves graph-based modeling and scalable production services in Python/Go on major public clouds.
Software Engineer AI
At Zypp in Rotterdam, a software engineer designs and builds scalable AI-driven systems — LLMs, AI agents, and RAG — on the company's own agent platforms and client-facing solutions. Strong backend focus (Python, FastAPI, database design), with Azure and Supabase preferred and frontend experience a plus.
Software Engineer
Full-stack engineer at PolicyMe, a Toronto-based digital insurance startup, building AI-powered web applications that automate insurance broker workflows. Works across frontend, backend, and AI/ML using Python, React, Redux, PostgreSQL, n8n, LangChain/LangGraph, and AWS. Remote-first within Canada.
QAE / Software Engineer
Hands-on QA engineer/SDET at Barn2Door, an e-commerce platform helping farmers sell directly: builds test plans, automation frameworks, and AI-driven QA to ship quality software. Core stack: JavaScript testing frameworks, SQL, API testing, and CI/CD.
Lead Software Engineer (Java)
Lead backend engineer building greenfield Java 25/Spring Boot microservices and REST APIs on Postgres for a fast-growing fintech — systems include card payments, treasury management, transaction booking, and crypto liquidity. Hybrid role based in Kraków with 3–4 days a week in-office.
Senior Software Engineer (Java)
Senior backend engineer building greenfield and existing Java 25 / Spring Boot microservices and REST APIs on PostgreSQL for a fintech's systems (card payments, treasury, transaction booking, crypto liquidity), using TDD, DDD and CI/CD. Hybrid role based in the Kraków office, 3-4 days a week on-site.
Senior Software Engineer
Senior full-stack engineer at Amber Electric building products that automate home batteries and EV charging against real-time wholesale power prices. Works across a TypeScript stack: React Native/React frontends, a serverless AWS Lambda backend with Apollo GraphQL, and DynamoDB/Postgres.
Senior Mission Software Engineer
Builds and owns Varda's ground segment software for spacecraft operations: telemetry ingestion/commanding services, operator mission-control UIs, and simulation/test automation, plus the self-service mission platform (CI/CD, infrastructure-as-code, observability). Primarily Python with Docker/Kubernetes; on-site in El Segundo, CA.
Founding Engineer
Early-career founding engineer (third engineer) at a healthtech startup: starts with technical customer support for AI-powered clinical conversation simulations used in education, builds automations and internal tools, then transitions into full-stack product development. On-site in NYC with the founders; stack involves AI agents and LLMs.
Software Engineer
Early-stage startup hiring a full-stack/backend engineer to build AI coding agents and the runtime infrastructure that automates mission-critical supply chain integrations, owning systems end to end. TypeScript-centric stack (React, Bun, Effect-TS, PostgreSQL, Kubernetes, AWS); on-site in San Francisco, $150k-$300k.
Software Engineer
Full-stack-leaning backend engineer at Replikate Labs building services, APIs, and data pipelines (Python, TypeScript, SQL) behind the company's ventures. Day to day: data modeling, ETL/ELT pipelines, background jobs, tests, code review, and some frontend feature work with React-style tooling.