Skip to content
Search jobs inside your AI agent. Claude, ChatGPT, Claude Code, Codex, Gemini, Cursor and Grok
Connect

2,917 Founding Engineer jobs

Founding engineer roles building the first product at early-stage startups.

2.9K jobs
Hark
25 views last month

Member of Technical Staff, Multimodal Post-train/RL

Open 140d North AmericaFull-time No extra questions
United States
San Jose

Build real-time multimodal AI models (text, audio, vision) using RLHF/PPO and post-training techniques to power next-gen agentic systems and hardware.

Agentic AI AI Data Quality Machine Learning Neural Networks +1 skills
180K – 450K $
 Sign in to see your match
Thyme Care Backed by a16z
72 views last month

Senior Software Engineer

Open 90d RemoteNorth AmericaSenior 4 questions
United States

A Senior Backend Engineer builds and maintains **Thyme Box**, a proprietary care management platform for oncology teams, using Python (FastAPI), Postgres, and AWS to streamline patient navigation, data integration, and clinical workflows.

AI Automation Data Science Datadog FastAPI +5 skills
165K – 185K $
 Sign in to see your match
Inversion
23 views last month

Senior RF Systems Engineer

Open 54d North AmericaSenior 4 questions
United States
Playa Vista, California

Inversion (space reentry vehicle startup) seeks a Senior RF Systems Engineer in Playa Vista, CA to own flight and ground RF/telemetry systems end to end: link budgets, antenna radiation modeling, COTS component selection, bench and vehicle-level testing, S/L-band ground stations, and FCC/ITU/NTIA licensing docs, using tools like Ansys HFSS and Python/MATLAB.

Ansys Ccpa Itar MATLAB Oscilloscope +2 skills
137K – 193K $
 Sign in to see your match
Inversion
22 views last month

Senior Avionics Test and Integration Engineer

Open 132d North AmericaSenior 3 questions
United States
Playa Vista, California

Engineer avionics systems for a space-transport startup, integrating and testing flight hardware, building test rigs, and troubleshooting electrical subsystems for hypersonic reentry vehicles.

Ccpa Corrective Action C++ Embedded Software Ethernet +11 skills
137K – 193K $
 Sign in to see your match
Northwood Space Backed by a16z
27 views last month

Senior RF Systems Engineer (Portal)

Open 144d On-siteNorth AmericaFull-timeSenior 8 questions
United States
Torrance, CA

Designs and tests RF and antenna systems for satellite ground stations, including phased arrays and beamforming, using MATLAB/Python and RF test equipment.

Embedded Software EVM FPGA Itar MATLAB +1 skills
140K – 226K $
 Sign in to see your match
David Joseph & Company
23 views last month

Member of Technical Staff, Inference Systems

Open 40d North AmericaFull-time
United States
Palo Alto, California

Build a brand-new LLM inference platform from scratch in Rust for a seed-stage stealth AI-infrastructure startup: own batching, scheduling, KV cache/prefix caching, request routing, and multi-GPU/multi-node serving, profiling for latency and cost per token. Stack centers on Rust plus Python/PyTorch, vLLM/SGLang/TensorRT-LLM, and CUDA/Triton/NCCL.

AI API C++ CUDA Distributed Systems +10 skills
230K – 350K $
 Sign in to see your match
Mantari
21 views last month

Software Engineer Intern

Open 40d North AmericaInternshipIntern No extra questions
United States
Torrance, California

Summer software engineering internship (full-time, on-site in the Los Angeles area) at Mantari, an early-stage AI-native weather-intelligence startup. Interns build sensor data pipelines, APIs, dashboards, and cloud/edge deployment tooling in Python, C++, or Rust for defense and weather products.

AI API AWS Azure CI/CD +18 skills
 Sign in to see your match
Poetiq
7 views last month

Member of the Technical Staff

Open 40d On-siteNorth America 2 questions
United States
Los Altos

Poetiq is hiring Members of Technical Staff in Los Altos, CA to advance Recursive Self-Improvement (RSI) in AI: designing self-improvement algorithms, probing LLM reasoning strategies, and building high-performance infrastructure that runs autonomous optimization loops at scale. The role is fully on-site.

AI Data Pipelines LLM
150K – 500K $
 Sign in to see your match
Agave Backed by Y Combinator
11 views last month

Senior Software Engineer

Open 41d On-siteNorth AmericaSenior 2 questions H-1B sponsor history — This employer has had H-1B petitions approved by USCIS in the last five fiscal years, per the USCIS H-1B Employer Data Hub. The approval belongs to the employer and is not a commitment to sponsor this role.
United States
San Francisco

Senior full-stack/backend engineer at Agave, a Series A startup building the financial operations platform for construction, to own architecture of integration, sync-engine, and AI/agent subsystems handling large-scale distributed data. Stack: TypeScript, React, Postgres, Redis, AWS. In-office in SF 5 days/week for Bay Area candidates; remote-optional elsewhere with a relocation bonus.

AI Analytics API Authentication AWS +13 skills
220K – 285K $
 Sign in to see your match
Inversion
17 views last month

Staff Flight Software Engineer, Arc Vehicle

Open 141d North AmericaStaff 3 questions
United States
Playa Vista, California

Designs and leads the flight software for a hypersonic reentry vehicle, integrating GNC algorithms and ensuring safety-critical reliability in embedded C++ on Linux.

Automation Ccpa CI/CD C++ Embedded Linux +8 skills
165K – 236K $
 Sign in to see your match
Inversion
20 views last month

Senior Ground Software Engineer

Open 141d North AmericaSenior 3 questions
United States
Playa Vista, California

Senior engineer builds and maintains ground control software for space vehicles, integrating with flight systems and simulations to command and monitor re-entry missions.

Angular Bash Ccpa C++ Distributed Systems +8 skills
139K – 201K $
 Sign in to see your match
SyncHR
10 views last month

Senior Software Engineer

Open 17d North AmericaSenior
United States
New York

Senior backend engineer at SyncHR, an AI-native startup replacing legacy systems with a modern system of record that unifies workflows, data, and money movement in a highly regulated industry. Own features end to end using Python, React, Docker, Kubernetes, and GCP; hybrid in New York or San Francisco, with H-1B/OPT transfers welcome.

AI Cloud Docker GCP Kubernetes +2 skills
 Sign in to see your match
SyncHR
28 views last month

Senior Software Engineer

Open 17d RemoteNorth AmericaSenior
United States
Austin

Senior engineer to design and own merchant-facing APIs (disputes, reconciliation, catalog) at a Series A payments startup, optimizing a Python/Django monolith and building the merchant dashboard. Stack: Python, Django, Next.js/React/TypeScript, Datadog. Fully remote within the US; $175K–$200K base + equity.

AI API Api Design Datadog Django +5 skills
175K – 200K $
 Sign in to see your match
Inversion
21 views last month

Senior Flight Software Engineer, Arc Vehicle

Open 141d North AmericaSenior 3 questions
United States
Playa Vista, California

Senior Flight Software Engineer at Inversion designing and implementing safety-critical flight software for a hypersonic reentry vehicle, using C/C++/Rust on embedded Linux with real-time systems and hardware interfaces.

Ccpa CI/CD C++ Embedded Linux Embedded Software +9 skills
139K – 201K $
 Sign in to see your match
Inversion
16 views last month

Senior Flight Software Engineer

Open 141d North AmericaSenior 3 questions
United States
Playa Vista, California

Senior Flight Software Engineer at Inversion designing, implementing, and testing software for next-generation reentry vehicles that operate in space and return to Earth, using systems-level languages like Rust, C++, or C.

Ccpa CI/CD C++ Embedded Linux Ethernet +13 skills
140K – 178K $
 Sign in to see your match
Inversion
22 views last month

Ground Software Engineer II, Arc Vehicle

Open 141d North AmericaMiddle 3 questions
United States
Playa Vista, California

Develops and maintains mission control software, telemetry pipelines, and data visualization tools for a hypersonic reentry vehicle, using Rust and Linux.

Ccpa Containerization Data Visualization DevOps Distributed Systems +17 skills
101K – 160K $
 Sign in to see your match
Frontera Backed by Lightspeed
22 views last month

Software Engineer - Integrations Platform

Open 141d RemoteLATAM Salary + equity 1 question
Colombia
Bogotá, Medellín

Backend software engineer on Frontera's Integrations Platform, building and scaling APIs, data pipelines, and services that move data between external partners, healthcare systems, and internal products. Core stack centers on Python or Node.js, relational/NoSQL databases, and distributed systems in a HIPAA-compliant behavioral health platform.

AI Airflow API Data Modeling Data Pipelines +8 skills
 Sign in to see your match
Laminar Backed by Y Combinator
25 views last month

Junior Software Engineer, Edge Platform

Open 41d HybridNorth AmericaInternshipJunior 4 questions
United States
Boston, MA

Junior engineer building Laminar's Linux-based edge computing platform for self-driving factories: provisioning factory servers, deploying apps with containers/VMs, integrating industrial protocols like Modbus and OPC UA, and improving monitoring and reliability. Core stack includes Linux, Python/Rust/C++/Go, shell scripting, Docker, and networking.

AI Automation Bash C++ DNS +12 skills
91K – 121K $
 Sign in to see your match
Xona Space Systems
22 views last month

Software Developer / Développeur(euse) logiciel

Open 42d On-siteNorth AmericaFull-time 6 questions H-1B sponsor history — This employer has had H-1B petitions approved by USCIS in the last five fiscal years, per the USCIS H-1B Employer Data Hub. The approval belongs to the employer and is not a commitment to sponsor this role.
Canada
Montreal

Software engineer at satellite-navigation startup Xona Space in Montreal, building a desktop application to interface with in-house satellite receivers and writing application code for satellite subsystems. Day-to-day work centers on C and Python, Qt-based GUIs, embedded hardware protocols, and RTOS development.

Bash Embedded Systems Ethernet Firmware I2c +6 skills
 Sign in to see your match
120ft Factory AB
17 views last month

Robotics Systems Engineer

Open 41d HybridEurope 2 questions
Sweden
Stockholm

This engineer owns the deterministic supervisory and orchestration layer for agentic AI in physical manufacturing — defining what 'skills' are, enforcing architectural contracts and safety-state projections, and gating cell deployments. The work centers on control theory, state machines, behavior trees, telemetry, and integration across robotics, simulation, and MES/ERP layers.

Agentic AI AI Bash ERP
Sign in to see your match