2,917 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer Intern, Implant
Develops and maintains software for Neuralink’s brain-machine interface implants, including SDKs, firmware tooling, manufacturing systems, and monitoring platforms. Works with low-level systems and production-grade software in a mission-driven R&D environment.
Software Engineer Intern, Robotics
Intern developing safety-critical software for surgical robots that implant Neuralink's brain-computer interface devices, primarily using C/C++/Rust on Linux.
Software Engineer
Backend-leaning full-stack engineer at a profitable AI travel startup building a luxury travel booking platform (hotels, villas, yachts, private flights). Day to day: Python/FastAPI supplier integrations, PostgreSQL data architecture, Redis/GCP infra, and LLM-powered search, plus some React/TypeScript. Remote UK/EU, £65-85k + equity.
Microsoft 365 Integration Engineer
Fully remote (India-based) backend integration engineer building Microsoft 365 connections — Microsoft Graph API, SharePoint Online, Outlook/Exchange Online, Azure, Entra ID/OAuth 2.0 — that power AI-driven legal contract and document workflows for an early-stage AI product team. Requires 3+ years software development and 1+ year hands-on with Graph API.
Sr. Software Engineer, Search Infrastructure
Build and optimize large-scale search infrastructure handling millions of transactions, focusing on real-time indexing, serving, and relevance for AI-powered products.
Sr. Web Engineer (X)
Builds and optimizes full-stack web features for a real-time social platform, using modern frontend and backend technologies to deliver high-performance, scalable user experiences.
Software Engineer, Linux Kernel
Build and maintain a high-performance Linux OS for a supercomputer network, write device drivers, and debug hardware/software issues in a fast-paced AI startup.
Graduate Software Engineer
Entry-level graduate software engineer role in Durban doing full-stack development across the entire SDLC — design, coding, testing, deployment, and production support — for a fast-growing tech startup, working with modern programming languages, Git, and cloud platforms alongside senior engineers.
Staff Software Engineer, Chainguard Harness
Staff engineer on Chainguard Harness, an AI product that uses frontier models to hunt exploitable vulnerabilities in customer applications and deliver validated findings with recommended fixes. You own the architecture end to end, build security-first infrastructure protecting customer code, and scale the service, using Go, AWS/GCP, Terraform, and virtualization.
People Systems Engineer
Builds the People tech stack at AI-infrastructure company Nscale: custom tools, integrations, and agentic AI workflows connecting Workday, Greenhouse, and adjacent systems, with secure permission-aware access. Requires production LLM/agent development experience (e.g., MCP) and practical Workday expertise; US compensation of $150k–$230k base plus bonus and equity.
初級プログラマー／プログラマー(WEBサイト・インターネットサービス系)
Entry-level programmer role at a Japanese IT company that runs its own IT school. Complete beginners get up to 2 months of paid training (Java, Python, PHP), then build IT systems and apps on client projects, with a path toward system engineer roles. Work sites span major Japanese cities; remote varies by project.
Systems Engineer, Electro-Optical Payload Electronics & Integration
Mid-level systems engineer in Irvine, CA who acts as the technical bridge between a space company's payload, electrical, FPGA, and firmware teams — defining interface control documents, planning hardware-in-the-loop testing, and debugging anomalies spanning hardware, firmware, and software for integrated electronic spacecraft payloads.
Member of Technical Staff, Computer-Use Agents
Research-engineer role on Hark's Computer-Use Agent team in San Jose, building agents that complete long-horizon tasks on a user's computer. Work spans environments/data generation, agentic evals, RL post-training (SFT, PPO/GRPO, reward modeling), and training/inference infrastructure for large-scale agent rollouts.
Senior Java Developer - HR Tech (Hybrid PT)
Senior Java Developer building high-performance microservices and APIs for uClockit HR's B2B HR Tech product, taking part in architecture decisions and collaborating with multidisciplinary teams. Hybrid role based in Lisbon or Leiria, in a startup-style environment with daily English communication.
Senior Software Engineer
Senior engineer at a well-backed AI startup whose product automates complex, content-heavy business workflows. Day to day: building high-throughput Python/Django services and distributed systems, contributing to the React/TypeScript frontend, and owning features end to end, with €80k–€120k plus equity, fully remote in CET.
Software Engineer, Platform Security
Builds AI-powered security tools to protect Kubernetes infrastructure and secure AI-driven systems, using Python, Rust, or Go in a fast-paced startup environment.
Software Engineer - Recent Grad
New grad/junior software engineer at Kikoff, a profitable pre-IPO consumer fintech that helps millions build credit and save money. Day-to-day work spans a Ruby on Rails backend on AWS plus ReactJS and Flutter frontend/mobile apps, in the San Francisco office.
Senior/Staff Software Engineer (Platform and Execution Model)
Build and own core parts of Trase OS, the distributed platform that orchestrates long-lived AI agents and workflows in regulated environments like healthcare and national security. Day-to-day focuses on durable execution, correctness under failure, platform APIs/SDKs, and distributed systems design using languages like Go, Rust, Java, or TypeScript.
Senior/Staff Software Engineer (Platform and Execution Model)
Senior/Staff engineer building Trase OS, the distributed platform that orchestrates long-lived AI agents and workflows in regulated healthcare and defense environments. Day to day is hands-on distributed systems work — execution model, reliability, security, observability — plus mentoring and cross-team architecture leadership.
Member of Technical Staff, AI Researcher (New Stealth Startup)
At a new stealth startup incubated by Red Cell Partners, this blended AI research/engineering role designs evaluation frameworks, RL environments, and reward/feedback systems for frontier LLMs and agents, runs fine-tuning and RL experiments, and ships findings into production tools. Core stack: Python plus frontier-AI methods (evals, post-training, RL).