Promptfoo | Senior/Staff Engineers, Security Researchers, GTM & Founding Operators | REMOTE (North America) / Hybrid San Mateo CA | Full-time | https://promptfoo.dev

Promptfoo is the MIT-licensed open-source toolkit 125 000+ developers use to evaluate and secure LLM apps. We just closed an $18.4 M Series A led by Insight Partners with participation from a16z and are scaling a small, senior team of high-agency builders.

Open roles

- Senior / Staff Full-stack Product Engineer (TypeScript + Python)

- Senior / Staff AI Security & Red-Team Engineer

- Solutions Architect / SE (multiple)

- Product Marketing Manager (cyber focus)

- Enterprise Account Executive (Bay Area, multiple)

- Technical Writer

- Developer Advocate

Why join

- Build the definitive AI security stack already used at 30+ Fortune 500s.

- Work in open source.

- Competitive salary, meaningful equity, async-friendly culture of ownership.

How to apply

1. Skim https://github.com/promptfoo/promptfoo then run:

npx promptfoo@latest init --example getting-started 2. Email Email is hidden with subject “HN – July 2025”, a short intro, and a GitHub / LinkedIn link.

3. I reply to every thoughtful application and send swag to anyone who tries or contributes to Promptfoo.

Careers page: https://www.promptfoo.dev/careers/

Stellar Science | Hybrid (USA) Albuquerque NM, Washington DC (Tysons VA), Dayton OH | Full time, interns/co-ops | U.S. citizenship required | https://www.stellarscience.com

Company: We're a small scientific software development company that develops custom scientific and engineering analysis applications in domains including: space situational awareness (monitoring the locations, health and status of on-orbit satellites), image simulation, high power microwave systems, modeling and simulation, laser systems modeling, AI/ML including physics-informed neural networks (PINN), human body thermoregulation, computer vision and image processing, high performance computing (HPC), computer aided design (CAD), and more. All exciting applications and no CRUD. We emphasize high quality code and lightweight processes that free software engineers to be productive.

Experience: Other than interns, we currently require a Bachelors degree in physics, engineering, math, computer science, or a related field, plus preferably 3+ years of work experience or a Masters or PhD in lieu of work experience. (Roughly 30% of our staff have PhDs.)

Technologies: Mostly C++23, Qt 6.9, CMake, git, OpenGL, CUDA, Boost, Jenkins. Windows and Linux, msvc/gcc/clang/clangcl. AI/ML and other projects use Python, some use Java or Javascript/Typescript/React.

Apply online at https://www.stellarscience.com/careers/.

Column (https://column.com/) | San Francisco, CA (ONSITE) | Full Time | Software Eng (Infrastructure), Software Eng (Backend), Software Eng (Product)

Column is building the infrastructure that powers the US dollar globally. We own a nationally chartered bank that we've built from the ground up. We're currently processing trillions of dollars annually, supporting some of the largest and most sophisticated companies out there like Wise, Bilt, Brex, Ramp, Mercury and dozens of others.

Previous to this I started Plaid (plaid.com), and at Column I'm focused on keeping an extremely lean and experienced team. We're currently 10 experienced engineers that all report to me. We are looking for an ambitious infrastructure, product, and backend engineer (one of each) that wants to build incredible software from first principles.

Apply here: https://column.com/careers

Feel free to email me with any questions: william@

Charge Robotics | Multiple Roles | Full-time | Onsite / Hybrid | SF Bay Area

Hi HN! We’re a YC-backed, Series-A startup building robots that build large-scale solar farms.

Check out a video of our first system here! https://youtu.be/zz2fp1y5z2e

It turns out that construction companies literally can't build solar fast enough, so what we're doing is a crucial part of switching the grid over to renewable generation.

You’ll be a key contributor, helping bring our next generation of mobile solar factory to life.

Come work with us if you love:

* Fast-paced prototype development with software and hardware components

* Making a positive climate impact through your work

* Hacking on massive construction equipment!

Robotics Software Engineer: https://www.workatastartup.com/jobs/51266

Mechanical Engineer: https://www.workatastartup.com/jobs/64008

Endeavor AI - Onsite (San Francisco)

We build agents for industrial manufacturing. Help us scale our agents to process order documents at scale.

Roles (contract or full-time)

1. Senior infrastructure / distributed systems

2. Front-end engineer focused on performance and maintainability

Full-time option: roles are 6 days/week in our office near the Embarcadero -- lunch/dinner provided

Contract option: remote and part-time ok

Email Email is hidden

Vizio/Walmart | ONSITE(Addison/Dallas TX)

We are looking for a highly technically skilled and experienced Senior Software Engineer with a passion for embedded systems and a deep understanding of Smart TV applications to join our team. You will be responsible for the design, development, and implementation of cutting-edge software for the next generation of Vizio Smart TVs.

Apply here: https://walmart.wd5.myworkdayjobs.com/walmartexternal/job/us...

https://walmart.wd5.myworkdayjobs.com/walmartexternal/job/us...

Sepal AI | San Francisco, CA (Hybrid) | Full-Time

Things we're building out:

1. Complex RL environments for AI agents across many domains

2. Various tools to streamline eval creation

3. Various tools to streamline hiring operations

Who we've looking for:

1. Python/Typescript full-stack engineer

2. Good to have: infra and container experience

3. Have high ownership, moves fast, likes to work on highly ambiguous problems

4. Wants to work at the frontier of AL eval and RL data

If you're interested or just curious, email me directly at steven at sepalai dot com

Autokroma.com | C / ffmpeg / codecs / GPU / AI dev workflows | Full-time | HYBRID REMOTE ONSITE | Porto / North of Portugal We do audio video software : video editing plugins, web panels, GPU visual effects, encoders, decoders, AI assisted development & testing. All levels are welcome but be sure to make me understand what are your current capabilities and goals. You will work close to the code, user requests, whole UX in general, I try to minimize the layers between developers, products and final users.

If any of those topics are of interest to you, and you're around Porto to meet me : send me an email, the first part of the email is "contact" and after @ the domain name. Tell me your story, what you're looking for in your life now, a previous bad work experience you'd like to avoid and a good work experience that inspires you for the future.

Apollo Agriculture | Full Stack Software Engineer | Full-time | Amsterdam, NL | https://www.apolloagriculture.com/team Apollo Agriculture (YC F1) is bringing modern farming to the world's poorest farmers. Millions of farmers globally don't have access to the basic resources the rest of the world depends on for food production: good seed and fertilizer. We sell these on credit, use ML to figure out who we can lend to profitably, and are growing rapidly (two countries and growing).

We are a small, motivated team with SV roots and an ownership culture. Come help us make a real difference in the world!

Our core engineering team supports a wide range of tools and processes. Our primary stack is Scala 2 w/ cats, backed by psql. If you are an experienced and practical problem solver, we'd love to meet you.

... due to our size and focus, we look for candidates who are experienced and can be autonomous -- at least at the "senior" level. Visa sponsorship is possible!

Drop me a line at Email is hidden if you're interested; I'm happy to chat.

Pylon (https://pylonlending.com) | ONSITE Menlo Park / San Francisco, CA

What Stripe did for payments, Pylon is doing for the mortgage industry: We're taking a sleepy industry with backward technology and re-building the stack from the ground up. We're first-principles thinkers, and our team is small, talented and ambitious.

I'm hiring generalists who love coding and want to build something beautiful in an industry where technology written in the 90s is the norm. We're Series A, well funded, and we have traction with customers. Come to Menlo Park or SF and help us turn the $2 trillion US mortgage industry into a set of APIs.

I've been commenting on HN since 2009, if you apply through this link, I'll personally reply to your app:

https://jobs.ashbyhq.com/pylon?utm_source=hn-whos-hiring

If you like:

- Programming languages

- Operations research & optimization

- Building things the right way

Come join us!