2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Senior Software Engineer (REMOTE)
Senior backend engineer building and hardening Cyware's Cyber Fusion platform (SOAR/TIP) in Python/Django, shipping scalable microservices and AI/LLM-powered features that run in commercial SaaS and AWS GovCloud under FedRAMP/GovRAMP compliance, partnering with DevOps and GRC on CI/CD and security controls.
Member of Technical Staff
Freed, a Series A AI healthcare startup building AI tools that cut clinicians' admin work, is hiring a hands-on full-stack product engineer (hybrid, SF Bay Area or Seattle) to own features end to end — building with React, TypeScript, and SQL, prototyping with AI-assisted dev tools, and working directly with clinicians to ship quickly.
Software Engineer
Full-stack software engineer at Arondite, a London-based defence tech startup building software and AI for autonomous systems. You'll design core platforms and UIs for tasking robots and processing sensor data, working across server-side (C++/Java/Rust/Python) or frontend (TypeScript/React/Angular) stacks, office-first in London.
Software Engineer, Security
Builds and maintains security infrastructure for Exa’s AI-driven search engine, protecting web-scale data processing, embedding models, and vector databases while ensuring compliance and incident response.
Software Engineer
Full-stack software engineer joining a stealth FinTech startup in Abu Dhabi as the second engineering hire, building an initial MVP for a digital assets & analytics product from the ground up. Requires 4+ years of engineering experience and a background with financial instruments; immediate starters only.
Senior Software Engineer
Build and maintain retirement-account platforms for small and medium businesses using Node, TypeScript, React, AWS, and PostgreSQL, while leveraging AI coding assistants to accelerate development.
Engineering Manager
Parallel is hiring its first Engineering Manager in Paris to lead a stream of AI/software engineers building LLM-powered agents that automate hospital admin work like medical coding. The role is ~50% hands-on coding and 50% people management — 1:1s, growth, tech direction — while helping scale the 10-person team toward 20+.
System Engineer (ISOS Host)
Systems engineer on the Future Projects team developing a robotic orbital station for in-space operations and services. Day to day: system-level trade-offs, defining and flowing down requirements, functional breakdowns, technical budgets (mass/power), and supporting customer technical reviews. Core tools: systems engineering methods plus Python/Fortran/Matlab.
Lead Software Engineer
Leads a small team of front-end and back-end engineers building Air's AI-native Enterprise Readiness platform for government and defense customers — running Agile ceremonies, setting coding/testing standards, and developing Spring Boot/Quarkus applications with SQL databases. Onsite in Pittsburgh, PA; U.S. citizenship required.
Senior Software Engineer
Senior Backend Engineer at Cyera, a data and AI security startup. You'll process petabytes of cloud data, build product features with TypeScript/NodeJS/NestJS, work with AWS/GCP/Azure, and optimize big data pipelines at scale in a lean startup environment.
Senior Software Engineer
Senior full-stack engineer at PolicyMe, a Toronto-based digital insurance startup, building an AI-powered broker product. Works across front end, back end, and AI/ML — leading architecture, prototyping AI systems, and mentoring — using Python, React, Redux, PostgreSQL, LangChain/LangGraph, n8n, and AWS.
Engineering Manager (m/f/d)
Leads an engineering team at voize, a YC-funded Berlin startup whose AI turns nurses' spoken documentation into care-home records. Day to day: hiring, coaching, and building team culture while staying hands-on in architecture decisions, code reviews, and driving high-quality, scalable software delivery.
Founding Engineer
One of the first technical hires at an a16z-backed AI personalization startup, this hands-on founding engineer ships product end-to-end: building AI agents/agentic workflows, real-time personalization and experimentation systems, and making architecture calls across the stack. Core stack: Node.js, React, GCP, BigQuery, PostgreSQL, Redis, Pub/Sub.
C++ Senior Software Engineer
Build cross-platform C++ software (Linux/Windows) powering proteanTecs' chip health-monitoring platform, including full life-cycle development for advanced testing equipment. Day to day: C++11/14/17 development, maintaining Java/Python/C# interfaces, build tooling (CMake, Docker, GitHub Actions), and code reviews.
Software Engineer - State Estimation & Prediction (III)
Graduate software engineer (I or II) in Los Angeles building the state estimation and prediction models behind Lodestar's MITHRIL autonomous spacecraft-defense platform. The role researches and implements algorithms fusing probabilistic estimation (Kalman/particle filters) with deep learning to track targets and forecast trajectories, mainly in C++ and Python.
Software Engineer
Backend/full-stack engineer at Paragon, a fast-growing cyber intelligence company in Tel Aviv, owning end-to-end features for the client-facing platform and its backend services — designing APIs, distributed microservices, and event-driven systems with Go/Node.js, MongoDB, Kafka, Redis, and Kubernetes, with occasional React frontend work.
Software Engineer - Simulations (III)
Lodestar (Los Angeles) is hiring Software Engineers I-III to build the simulation environment for MITHRIL, its autonomous spacecraft-protection system. Day to day you develop high-fidelity sensor and environment models in Unreal Engine, stand up SIL/HIL test benches, and design distributed simulation services using C++, Python, and ROS 2.
Member of Technical Staff – Environment Engineering (AI Data)
Build data pipelines at an early-stage San Francisco startup that converts real professional work (e.g., engineering drawings and 3D models) into RL training environments and evaluations for frontier AI labs. You'll design datasets, quality checks, and graders with researchers and domain experts, on-site on a 9-9-6 schedule.