2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Desenvolvedor Python
Python developer maintaining and expanding a Selenium-based RPA for Mitri Web, a startup of Grupo Martins e Lemos whose MitriFolha and MitriFiscal products help companies cut tax costs. Remote (home office) PJ contract, working with React.js, Electron, MySQL, Trello and Bitbucket.
Software Engineer
Software engineer (graduate to senior) building Python services around Nairon's LiveKit-based real-time AI voice agent platform — call handling, CRM/calendar integrations, latency and conversation quality, messaging with NATS/Kafka/Redis, and cloud deployment with Docker/Kubernetes. Swiss startup hiring Greece-based candidates only.
Sr. Software Engineer, Agents
Sr. Software Engineer building LLM agents and multi-agent workflows (LangChain/LangGraph, LangSmith/Langfuse) to automate a used-EV marketplace's operations — document extraction, title/inspection review, dealer and seller communication — plus full-stack TypeScript/React work. Onsite in Sawtelle, LA; $175k–$200k.
Staff Software Engineer
Staff Software Engineer at Imagine Pediatrics designs, builds, and supports the digital product suite (front-end, APIs, back-end services, with some mobile) powering 24/7 virtual-first pediatric care, with a focus on scale, stability, and user experience. Core stack is JavaScript, Node, React, and AWS, plus mentoring and on-call rotation duties.
Cryogenic Systems Engineer / Cryogenics Engineer (w/m/d) – Cryostat & HTS
Owns the cryogenic side of MagnoTherm's magnetocaloric cooling program in Darmstadt end to end: thermal-network simulation, specifying the bespoke warm-bore cryostat and running its manufacturer, selecting cryocoolers, designing current leads, and building/validating the cryogen-free module housing HTS coils. Requires hands-on cryostat and cryogen experience, strong CAD, and German plus English at
Robotics Software Engineer - Field Deployment & Support
Field deployment engineer who owns and writes the production software running Destro AI's MothershipOS robotics platform in live customer warehouses — deploying containerized services, debugging full-stack issues, and handling on-site incidents. Core stack: Python/C++, Docker, Linux, networking, and GCP, with heavy travel and off-hours on-call.
Software Engineer I
Entry-level software engineer on Human Interest's Payroll Integrations team, building and maintaining the connections that sync 401(k) retirement data with hundreds of payroll providers. Day-to-day work is on cloud-based, service-oriented fintech systems using modern OO languages and AI-assisted engineering.
Senior Software Engineer
Senior Software Engineer at Replicant building AI-powered voice agents that handle millions of calls monthly for Fortune 500 companies. You'll ship full-stack features in TypeScript/Python, integrating speech recognition, TTS, and LLM capabilities, fully remote across the US or Canada, with competitive salary and equity.
Software Engineer
Software Engineer at an early-stage defence-tech startup building AI-powered planning and logistics software for military operations in disconnected environments. Full-stack work with TypeScript/React, backend APIs, databases and service architecture, including on-device/on-prem AI deployment, based mainly on-site.
Software Engineer
Software engineer at SigmaOS, a YC-backed London startup building a web browser designed for work. You'd build the Chrome extension API system for WebKit in Swift, make cross-device syncing seamless, and keep browser performance top-notch.
Senior Software Engineer Python GCP FastAPI
Senior Software Engineer / Lead Developer at a profitable FinTech start-up in Central London (hybrid, two WFH days per week). Blends team leadership, mentoring and engineering standards with hands-on architecture and delivery on a Python platform built on GCP and FastAPI. Pays £90k–£120k per year.
Python Developer for AI-Driven IoT Platform
SunMate.IO is hiring a Python developer for a small team managing solar panels, batteries, and EV chargers for thousands of Danish customers. Day to day: building performance-critical containerized microservices in Docker and Kubernetes for energy management and grid balancing, with AI part of the daily workflow.
Python Developer
Python developer at SunMate.IO, a green-energy startup that manages solar panels, batteries and EV chargers for thousands of Danish customers. Day to day: building IoT-connected microservices in Docker/Kubernetes, real-time performance-critical energy-management code, and infrastructure as code, with AI as a daily tool.
Senior Engineering Manager (Connect)
Hands-on engineering manager leading Connect, Gigs' hosted checkout for embedded mobile plans that drives millions in yearly revenue. You'd lead and grow an engineering team building connectivity workflows for partner apps, staying deeply technical with a day-to-day stack of Next.js and TypeScript.
Engineering Manager (Usage)
Hands-on engineering manager leading the Usage team at Gigs, a startup whose platform lets companies embed mobile connectivity (like Stripe for telecom). You'd guide engineers building batch pipelines and APIs that turn raw carrier records into trusted subscriber usage data, using Go, Ruby, TypeScript, PostgreSQL, and GCP.
Software Engineer
Founding engineer at a stealth, seed-funded fintech building institutional-grade infrastructure for prediction markets, on-site in New York 5 days/week. You'll design and build cross-venue data normalization, APIs, and cloud infrastructure from scratch in Python, TypeScript, and AWS, working directly with the founders.
Member of Technical Staff, Hark Mobile
Build Hark’s native iOS app that delivers a real-time, multimodal AI agent with voice, text, and vision in a polished, high-performance experience.
Founding Engineer
Founding engineer at an early-stage B2B SaaS building AI tools for industrial ingredient manufacturers: building document-ingestion backends, AI agents for compliance/food-safety paperwork, and owning features end to end. Stack includes Kotlin/Spring Boot, React/Next.js, Postgres, and GCP; on-site in San Francisco.
Remote C++ Engineer — Fleet Control & Data Acquisition
Designs modern C++ software for fleet control and data acquisition on autonomous robots at Fieldwork Robotics' Lisbon team, building and managing data pipelines that support real-world robotic system performance.