2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Sr. Software Engineer - (Ruby on Rails)
Senior full-stack engineer (Ruby on Rails focus) joining Vconstruct's Noida team supporting a Silicon Valley construction-tech product startup. Day to day: designing, building, testing, and maintaining production-grade SaaS in an AI-first environment using AI coding agents, MCP servers, and agentic workflows.
Senior Software Engineer Python GCP FastAPI
Senior Software Engineer / Lead Developer at a well-funded, profitable FinTech start-up in London (with WFH options), blending technical leadership — guiding a talented team — with hands-on engineering in Python on Google Cloud Platform using FastAPI. Salary up to £120k.
Senior Software Engineer - Agentic AI (San Francisco) (San Francisco)
Onsite senior engineer (San Francisco) building production platform services for an AI-native fintech whose agentic AI serves credit unions and community banks. Day to day: own architecture, APIs and data models end to end and ship LLM/agentic AI features in TypeScript and Python, working directly with the CTO and CEO.
Staff Software Engineer, Motion Planning
Staff software engineer building motion planning components for autonomous trucks: design, implement, test, and integrate trajectory features that directly shape on-road self-driving performance. Core stack is high-performance modern C++ (plus Python) on compute-constrained vehicle platforms. Pittsburgh, PA or remote.
Founding Software Engineer
Founding engineer at a small healthcare-tech startup in San Francisco, building conversational AI features (voice and text) end to end: full-stack client/server work in one shared codebase, external integrations, and helping set technical direction alongside leadership. On-site, full-time.
Staff Software Engineer
Hands-on senior technical lead on a small product engineering team at a healthcare technology company: builds full-stack customer-facing features end to end, including LLM-powered functionality, while mentoring junior engineers and setting architecture and engineering practices. Hybrid, 3 days/week in San Francisco; $210–260k base plus equity.
Senior Software Engineer
Senior software engineer at an early-stage London AI startup building an AI-native data collection platform for field inspectors. Day to day: redesign an offline-first mobile app (Expo/React Native), build systems that turn voice notes, photos and video into expert reports, and design architecture for feeding context to AI models.
Member of Technical Staff
Sixtyfour, a YC-backed startup, builds AI agents that research and verify profiles of people and companies for sales, recruiting, and marketing teams. This in-person San Francisco role (new grad to senior) involves building OSINT research agents, evals, and large-scale enrichment pipelines, mainly in Python and TypeScript.
Senior Thermal Systems Engineer
Karman Industries, a Torrance (LA) thermal-hardware startup founded by ex-SpaceX/Rocket Lab/GE engineers, is hiring a Senior Thermal Systems Engineer to design and optimize its HPU zero-water cooling systems for 100kW+ AI data-center racks. Day to day: first-principles system sizing and modeling, PFDs, technical specs, cost estimates, and cross-team collaboration on heat pump and turbomachinery pr
Junior Web Developer: Remote Options + MacBook
Joinrs is hiring junior front-end developers (0-3 years) to build and maintain websites with HTML, CSS, and JavaScript and help create interactive, dynamic features. The role offers on-the-job training, a MacBook, and can be done fully remotely or from offices in Milan, Rome, or Madrid.
Senior Software Engineer
Builds AI-driven real estate marketing tools and internal workflows, bridging product, engineering, and customer needs to ship full-stack solutions in Python/TypeScript/React while measuring business impact.
Staff Systems Engineer, Software
Staff software systems engineer who architects and implements the software infrastructure coordinating precision manufacturing equipment, distributed control systems, and robotics at Atomic Machines. Day-to-day spans system architecture, APIs and distributed services (gRPC, REST, IPC), and hands-on development in languages like C++, Rust, or Go.
ABAP Developer - Mumbai
Build and maintain SAP ABAP integrations for CashFlo’s fintech platform, enabling seamless data exchange with enterprise SAP systems for payments, GST/compliance, and financing.
Senior Software Engineer (Hybrid / Montreal)
Senior software engineer (hybrid — 3-4 days/week in the Montreal office) building the Agent Runtime: the VM layer and services powering Runneth, Motion's AI agent for performance marketers. End-to-end feature ownership with TypeScript, Node.js, Rust, React, GraphQL, PostgreSQL, MongoDB, and Azure.
Python Developer (Software & Infrastructure)
Python developer with an infrastructure focus at an Italian AI/NLP startup: builds and maintains the application architecture around AI modules — API gateways, integration services, CI/CD pipelines, and Kubernetes container orchestration — and works with AI/ML engineers to deploy models as microservices.