2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Software Engineer (AI Quality & Reliability)
Build the automated evaluation and regression systems that decide whether Taxo's healthcare Voice AI agents are ready to release — test harnesses, versioned datasets, CI/CD quality gates, and release-readiness evidence across conversations, tool calls, and EHR integrations. Core stack: Python or TypeScript plus LLM evaluation tooling.
Senior / Staff Software Engineer, AI Leverage
About Suno We're building the world's first creative entertainment platform, where the entire world can feel the joy and fulfillment of making music. Music is for everyone: Our users include everyone from grandmothers…
Software Engineer – CTO Office
Develops runtime security detection capabilities for cloud/AI workloads, collaborating with engineering and research to enhance threat detection and automate testing/release processes.
Founding Engineer
Founding full-stack engineer at a YC-backed legal-tech startup (Vector Legal) building end-to-end web applications: React frontends, TypeScript backend APIs, NoSQL data models, and third-party integrations, while leveraging AI coding tools to ship features quickly for a platform delivering legal services to startups.
Founding Engineer
Founding Engineer to help establish Ultralytics' New York engineering team, owning features end-to-end across the YOLO computer-vision models and the surrounding platform (UIs, APIs, infrastructure). A hands-on senior/tech-lead role using Python, PyTorch, and AI coding tools, hybrid in the NYC office.
Software Engineer
Full-stack software engineer at Beacon, a Toronto fintech building a super app for immigrants with digital banking, remittances, and bill payments. Day to day you build and maintain APIs, backend services, and user-facing features, working with databases, AWS, microservices, and CI/CD.
Staff Software Engineer
All Gravy, an AI-native people-operations platform for hospitality and retail, is hiring a Staff Software Engineer to build and scale critical full-stack features (TypeScript, React, React Native, Node.js) across its scheduling and shift app. Candidates must be deeply fluent in AI-assisted development and thrive in a fast scale-up environment.
Software Engineer (Java)
Backend engineer building and improving greenfield fintech systems in Kraków (hybrid) — REST APIs and microservices for card payments, treasury, transaction booking and crypto liquidity. Stack is Java 25, Spring Boot, and PostgreSQL, with TDD, DDD, and CI/CD.
Software Engineer
Hands-on Python software engineer at a rapidly expanding defence start-up in Cambridge building AI-based hardware products, working on early-stage prototypes and mature product technologies. Core stack is Python with hardware/sensor interfaces; TensorFlow/PyTorch and embedded experience are pluses, and UK security clearance is mandatory.
Software Engineer
Full-stack engineer at Nestmed, a Series A startup building an AI-native operating system for home health/post-acute care agencies. You'd own features end to end across a Django/Postgres backend, React web app, and native iOS/Android apps, including AI agents that turn visit audio into structured clinical data.
Lead Software Developer
Lead Software Developer at UpTrade, a Melbourne-based crypto broker, owns the company's applications, backend, and cloud: building serverless Node.js/TypeScript services on AWS, React frontends, and MongoDB models for financial workflows, while provisioning AWS, Cloudflare, and Terraform infrastructure in a hands-on role alongside the founders.
Founding Engineer - Halter Labs
Halter is hiring a founding software engineer in Auckland to be the first engineer on a brand-new product vertical for farmers, owning the architecture, stack, and tooling from 0 to 1. The work is full-stack/backend with heavy daily use of AI development tools and regular visits to customer farms.
Senior Software Engineer-Data Team
Senior engineer on Axiamatic's Data team building AI-driven product features on top of customer business data: designing new features end to end, owning them in production, and mentoring less experienced engineers. Core stack is Python (expert) plus Java, microservices, SQL/NoSQL databases, AWS, and daily use of AI coding agents like Claude Code, Codex or Cursor.
Senior IT Engineer
Owns Range's corporate IT end to end: employee onboarding/offboarding, identity and SSO via Google Workspace, macOS fleet through MDM, SaaS management, and office tech — all managed as code in GitHub with CI/CD and AI-driven automations. Onsite in McLean, VA (occasional travel to NY and Seattle offices).
Software Engineer
Founding software engineer at Simple AI in San Francisco (on-site) building the core systems behind enterprise voice AI agents — shipping customer-facing features, improving latency and reliability, and scaling the platform. Likely stack includes TypeScript, React, Python, Ruby on Rails, PostgreSQL, and AWS.
Senior Software Engineer
Senior Software Engineer at Artemis, an AI-driven cybersecurity startup, building a large-scale data platform that ingests and analyzes massive volumes of security telemetry. The role spans backend services, distributed systems, data pipelines, and analytics infrastructure, using Python or Go, cloud platforms (AWS/GCP/Azure), and modern deployment practices, with an AI-native development culture.
System Engineer
System engineer at D-Fend Solutions (Raanana, on-site) to lead development of a cellular-based drone detection and mitigation system — architecting distributed telecom network monitoring systems, integrating with Tier-1 carriers, and mentoring an R&D group. Core tech: LTE/5G core networks, Python or JavaScript, Docker/Kubernetes, big data.
Staff Software Engineer
Lorikeet, an AI-native Series A startup building AI agents that resolve customer support tickets at scale, is hiring a hands-on Principal Engineer in its NYC office to set technical direction, own architecture, and solve hard reliability and AI-agent quality problems. Stack: TypeScript, React/Remix, PrismaORM, NestJS, and some Python.
Senior Software Engineer
Senior backend engineer building the infrastructure that connects New Zealand's fragmented health systems. Day to day: FHIR/HL7 integrations, APIs, authentication (OAuth 2.0), clinical data retrieval, testing and deployment, owning integrations end-to-end with external healthcare engineering teams.
Founding Senior Software Engineer (Portugal)
Clipbook, a media-intelligence startup that turns news, TV, podcast, and social data into real-time insights, is hiring a founding senior software engineer in Portugal. You'll architect and own features end-to-end, put LLMs/RAG pipelines into production, and build scalable APIs and services using Python/TypeScript, PostgreSQL, and cloud infrastructure.