2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer for Agentic AI (Junior–Mid Level)
Pantas, an AI-native startup in Kuala Lumpur (from a climate/financed-emissions platform), is hiring a junior-to-mid engineer to build agentic AI products like an organizational knowledge base, AI twins, and sustainability agents. Day to day: backend/full-stack work with LLMs, RAG, MCP servers and evals, using Python/Node and AI coding tools, on a hybrid 3-days-in-office schedule.
Software Engineer
Backend-focused software engineer at an early-stage AI startup in London that builds systems for detecting infringement and streamlining R&D. You'll integrate LLMs, ship product with the founders in one-week sprints, and talk to customers in an in-office, high-ownership culture.
Senior Platform Software Engineer
Senior full-stack platform engineer building React front ends, secure Node.js APIs, and Azure cloud services for the Evenflow enterprise collaboration platform, including Microsoft Teams/365 integrations and AI-powered workflows, while helping shape multi-tenant architecture, security, and engineering standards.
Software Engineer
Python machine learning engineer building production computer-vision models that turn live camera/video streams into real-time insights for mobility and infrastructure applications. Role splits Python software engineering with applied ML at a small Dutch scale-up in Leiden.
Founding Engineer
Founding engineer at an early-stage cloud infrastructure company building software that helps teams deploy and manage applications in their own cloud environments. Day to day: propose and own projects end to end, debug production systems (VMs, logs, open-source dependencies), and work directly with customers via Slack. On-site in NYC, $200k-$270k.
Member of Technical Staff - Reinforcement Learning
Trains AI agents with reinforcement learning to solve long-horizon problems in biology and scientific research — building RL environments, reward functions, evaluation frameworks, and distributed rollout/training infrastructure. Core focus: deep RL, post-training, agentic systems, and high-performance distributed/GPU engineering.
Senior Software Engineer
Senior Software Engineer building mission-critical ground software for a space technology startup in Westminster, CO — spacecraft command and control, real-time telemetry processing, and mission operations tools using Python, C++/Java on Linux. Onsite 5 days/week; pays $133k–$170k plus bonus and RSUs.
Software Engineer - Applications
Builds the engineering bridge between Elorian AI's Glimpse multimodal model and real-world deployments: reference architectures, developer SDKs, evaluation harnesses, and end-to-end enterprise applications. Python-first (TypeScript/Go/Rust a plus), on-site in Palo Alto, partnering with founders and early design partners.
Software Engineer
Backend-leaning full-stack engineer at a profitable AI travel startup building a platform to discover and book luxury hotels, villas, yachts and private flights. Day to day: Python/FastAPI supplier integrations, PostgreSQL data architecture, Redis/GCP infrastructure, LLM-powered search and recommendations, plus some React/TypeScript.
GTM Systems Engineer
Builds and scales the Salesforce architecture and broader go-to-market tech stack (Outreach, enrichment tools, AI/LLM workflows) behind Roboflow's revenue team — data models, forecasting infrastructure, BI dashboards, and data quality — growing into ownership of the GTM systems as the function scales.
Member of Technical Staff, Agents
Build autonomous AI agents that handle executive workflows end-to-end, plus the evaluation and monitoring systems that verify their reliability. Day to day is Python/SQL data work, designing evals and simulations, debugging production failures, and shipping agent capabilities (Django/React/TypeScript) on-site in Palo Alto.
Senior Member of Technical Staff
Senior backend engineer at an early-stage, hybrid San Francisco startup building AI tools for law enforcement evidence search. Day to day: design and deploy distributed systems running LLMs, vision models, RAG pipelines, and agentic systems in production. Core tech: Python, distributed systems, ML/LLM deployment.
Member of Technical Staff
Full-stack AI engineer at Clera building AI systems for hospitality guest-request workflows: response-generation pipelines, retrieval, multi-step tool orchestration, evals, observability, and extending to voice. Backend work in a language like Python, Go, Rust, or Java; on-site in San Francisco.
Senior/Staff Software Engineer, Platform
Senior/Staff platform engineer at an early-stage AI manufacturing and supply chain startup: builds and scales backend services in Next.js/TypeScript (with Python and Go), PostgreSQL data systems, event-driven pipelines, and LLM/RAG-based AI infrastructure for quote analysis and supplier recommendations.
Software Engineer C2 & Mission Planning
Design and build Command & Control and mission-planning software for interceptor air-defense systems, translating trajectory optimization, target allocation, sensor fusion and real-time replanning into high-performance C++ with clean Python bindings. Mid/senior, algorithm-heavy role, on-site in Paris.
Web Developer
Maintains and improves liquidinstruments.com for Liquid Instruments' Marketing team, implementing marketing initiatives like CRM integrations, analytics, conversion pipelines, and eCommerce improvements. Works with HTML5, CSS3/SCSS, JavaScript, PHP, MySQL, and WordPress.
Software Engineer
Full-stack software engineer building HaltH's health-payments platform for online bookings, payments, and health fund claiming for allied health providers. Day to day: designing production APIs and backend services, frontend surfaces, and AWS infrastructure. TypeScript-centric stack (Node/Nest/Next/React) on serverless AWS; full-time, in-office in Sydney (Surry Hills).
Software Engineer
Software Engineer at a clean-energy start-up in Bristol, building and enhancing customer-facing web applications with ownership of the UI, responsive/mobile-first design, and integration with services and APIs. Hybrid role (onsite Mon & Thu), backend exposure (Python, Postgres, REST) a plus; salary up to £50,000.
Reindeer- Software Engineer (Infrastructure)
Build and scale the core infrastructure powering an agentic AI platform for enterprise workflow automation, focusing on cloud platforms, container orchestration, data pipelines, and secure API integrations using Python.