2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Python Developer — AI Infra & Cloud Native
Python Developer focused on software infrastructure, working alongside AI/ML engineers at an Italian NLP startup to build and maintain the architecture around AI modules: API gateways, integration services, Kubernetes container orchestration, and robust CI/CD pipelines for model deployment.
Software Engineer Intern
Software Engineer Intern at SonicAI, an early-stage startup building an AI-native revenue automation platform for B2B finance teams (contract-to-cash, billing, reconciliation). You'll ship backend features, APIs, and AI-agent workflows using Python, FastAPI/Flask, and databases, working directly with the founder. Compensation is a ₹20,000–₹25,000 stipend.
Software Developer Intern (Remote)
This Week in AI, a small media and community platform covering AI developments, seeks a remote founding software developer intern to ship features across web apps and internal tools, automate operations, and experiment with LLMs and AI agents. Fullstack work with APIs, databases, and Git; React, Next.js, Python, or Node.js are pluses.
ML Systems Engineer — Model Serving & Runtime
Owns the end-to-end local inference stack for COTID's Windows and macOS desktop apps: selecting and integrating engines like MLX, llama.cpp, ONNX Runtime and TensorRT-LLM, handling quantization and model packaging, and dispatching across Metal, CUDA/DirectML/Vulkan and CPU — built largely in Rust (Tauri), C++ and Swift.
ML Systems Engineer (Intern) — Model Serving & Runtime
Builds and maintains the local model-inference runtime for COTID's Windows and macOS desktop apps — integrating engines like MLX, llama.cpp, ONNX Runtime and TensorRT-LLM on GPU backends (Metal, CUDA, Vulkan), plus quantization, model packaging, and multi-arch CI/CD — primarily in Rust, C++, and Swift.
Senior Software Engineer
Senior Software Engineer at Cypris, an early-stage AI startup building a vertical AI platform for corporate R&D teams. Day to day: hands-on design and building of core data infrastructure, APIs, and UI that power AI agents, using Python, GCP, PostgreSQL, and Elasticsearch on a small, flat, fully remote team.
Senior Software Engineer
Senior full-stack engineer at Zest, a gifting platform that lets ecommerce brands send 1 to 1,000 gifts without friction. You'll own features end-to-end (data model to API to UI), build integrations with ecommerce platforms and payment providers, and design reliable AWS systems handling real money and orders.
Software Engineer
Remote (US) mid-to-senior software engineer building a new plant-floor product line end to end — data model, API, UI, and deployment — for VALIS, an early-stage B2B SaaS company modernizing metal recycling. Stack: React/TypeScript, C#/ASP.NET Core, PostgreSQL, AWS, Docker, Pulumi, with heavy use of Claude Code.
Founding Engineer
Founding full-stack engineer (leaning ML) at an early-stage fintech startup building an AI 'Finance OS' whose agents run accounts receivable end to end. You'd own the product surface and agent layer — Java, Python, TypeScript, LLMs — compensated with 0.5–5% equity until the seed round closes.
Software Engineer II (AWS / Serverless / AI)
Founding-level engineer at Appicenter in Bengaluru building and operating a cloud-native AI platform on AWS: serverless backends (Lambda, Step Functions, API Gateway, Aurora, DynamoDB), Python/Java/React fullstack work, and LLM features via Amazon Bedrock. High ownership role working directly with founders, with equity offered.
Co-Founder & Chief Technology Officer (CTO)
Hands-on technical cofounder/CTO to architect and build Kinoflix's streaming platform end to end — full-stack apps for web, mobile, and TV, video hosting/CDN infrastructure, payments, and AI-powered discovery — using AI coding tools. Initially equity-only (20–35%), with salary only if future funding allows.
Senior Software Engineer AI Evaluation Coding Agents
Part-time contractor role evaluating AI-generated code and coding-agent behavior: reviewing model outputs against rubrics, judging correctness, and writing clear technical feedback. Requires 5+ years of software engineering (Python, TypeScript/JavaScript, or Go); open to US and Canada candidates at $100-150/hour.
Security Systems Engineer
Designs and runs the security control plane for Fluidstack's AI data centers from scratch — PKI, identity/deprovisioning, backups, disaster recovery, and monitoring — replacing vendor-managed physical-security appliances with versioned, reproducible infrastructure. Key tech: virtualization/clustered storage, SQL Server HA, AWS, and Terraform/Ansible/PowerShell.
Senior/Staff Software Engineer, Customer Integrations — PCB/CAD
Senior/Staff engineer on Quilter's File I/O team, resolving customer integration blockers and shipping Python parsers/exporters that move PCB designs between CAD tools (Altium, KiCad, Cadence Allegro, Siemens Xpedition) and Quilter's AI-driven PCB design platform, plus LLM/agent tooling to automate troubleshooting. Hybrid role based in Long Beach, CA.
Software Engineer
Software engineer at Syntrace, a startup building source-backed conversational knowledge tools for institutional investors. You own features end to end across the stack (TypeScript or Python) on an event-sourced, real-time, security-focused core in a small senior New York team.
Senior / Staff Software Engineer, Data Infrastructure
Senior/Staff engineer building and scaling Suno's data infrastructure — streaming and batch pipelines, feature computation, and low-latency serving that power music recommendations and ML. Stack centers on AWS (Kinesis, Flink, S3, Glue) plus Snowflake, Dagster, dbt, and Terraform, on-site in Cambridge, MA or NYC.
Mission Operations Ground Software Engineering Lead
Level III software engineer building and operating ground software for spacecraft at Quantum Space in Hawthorne, CA: telemetry processing pipelines, command/telemetry workflows, microservices/APIs, and operational dashboards for integration and on-orbit missions. Stack includes Python/Go/C++/Java, Docker/Kubernetes, cloud, and streaming tech like Kafka.
Senior Software Engineer (Python/TypeScript)
Senior full-stack engineer at Lithosquare (Paris) building and operating its 'Geology OS' mineral-exploration platform: Python (Django/FastAPI) back-end, React/Next.js front-end with cartography and 3D visualization, on Kubernetes infrastructure, integrating agentic AI/LLM features. Office-based in Paris with flexible remote policy.