San Francisco Jobs - January 2026

Steel is building open-source browser infrastructure for AI agents & apps. We make it easy for AI engineers to ship products that interact with the web using our Sessions API - An API that controls fleets of browser sessions in the cloud while we handle everything from scaling to antibot and more.

Our tech stack:

- Frontend: Vanilla React + TailwindCSS + Shadcn, built with Vite, deployed on Vercel

- Backend: Fastify, Node.js, Zod, NATs, Drizzle with Redis, PostgreSQL, and S3

- Infrastructure: Pulumi, Go, Firecracker VMs, Docker

- Languages: Mostly Typescript, Rust, Go

With over 6,000 GitHub stars, dozens of paying customers, and millions of sessions served, we grew our platform 50x in 2025 purely through word-of-mouth and our open-source community. Backed by world-class investors, we're building a small, talent-dense team that's shaping the future of how humans & agents interact with the internet.

Current roles (all roles include competitive comp + equity):

- Infrastructure Engineer: Design, optimize, and scale our browser VM infrastructure

- Applied AI Engineer: Build on agent frameworks, integrations, and real-world AI use cases

- Founding Growth Lead: Own the growth machine to turn insane organic traction into a category-defining brand

- Founding GTM Lead: Be our first sales hire, closing deals with AI startups transforming entire industries

To learn more & apply (Mention HN): https://jobs.ashbyhq.com/steel

P.S. If you're feeling spicy, try our optional hiring challenge and submit the flag with your application once you reach the final step → https://challenge.steel.dev

Legion Health is building the AI-native operations layer for mental health care. We run our own psychiatric practice and use AI agents to handle the complex "backend" of healthcare—scheduling, intake, documentation, billing, and risk detection. We have $3M+ ARR, $7M+ raised, and our infrastructure currently supports 2,000+ patients with only one human support lead.

We're hiring a Founding Engineer to own our backend and agent systems end-to-end. This is not a "wrapper" role; you will be architecting the state machines and event streams that turn clinical intent into reliable operations.

The Role:

Build AI Co-workers: Implement agents with tool use, memory, and safety rails that act as trustworthy teammates for clinicians.

Event-Driven Architecture: Design the schemas and workflows (Node.js/TypeScript/Postgres) that encode how psychiatric care operates.

High Impact: Your work lands in real clinical workflows immediately, directly improving patient access and care quality.

Tech Stack: Node.js, TypeScript, Supabase (Postgres), AWS (ECS/Lambda), Next.js 15, OpenAI/Anthropic.

Offer:

Comp: $130k–$190k base + significant early equity (0.2%–0.8%).

Location: San Francisco (In-person).

Process: Intro -> Systems Deep Dive -> Practical Work Trial (No Leetcode) -> Onsite. We move fast (7-10 days).

Email me at yash@legion.health if you have questions or if you're super cracked and I have to know about you.

Apply here: https://jobs.ashbyhq.com/legionhealth/ffdd2b52-eb21-489e-b12...

Kinelo manages the new type of hybrid team that will emerge in the future: humans+AI working shoulder-to-“shoulder”.

Our first product helps human software engineering teams deliver more efficiently and more reliably by assisting in coordination and engineering management. But it’s built on a foundational layer that ingests data, knowledge, and process across communications and systems, exposing that to humans and AI alike.

Eventually, Kinelo will become a proper human+AI orchestration layer, managing entire companies, and our goal is to have Kinelo run Kinelo (we already dogfood it today).

We’re looking for high ownership individuals to join our small team and shape its direction. We also just opened a new SF office and new hires will have the ability to help shape company culture, engineering practices, architecture, and roadmap.

We’re well-funded (just raised another round), founded by a serial founder, anti-bureaucratic, and highly technical.

We’re looking for:

- Those who want to go 0 to 1 with high ownership: moving features and products from idea on a napkin, to prototype, to engineering UI, to shipped and polished product

- ~8 years professional experience, including the pre-LLM days with strong CS fundamentals

- A balance of wisdom from experience and optimism about the future

- Strong TypeScript and Postgres (or other RDBMS) experience at scale and with high reliability (SaaS apps, APIs, etc)

- Experience with a variety of technologies, including containerization, distributed systems, and at least one strongly typed programming language (Go, C++, Java, etc)

- Ideally experience with ML and AI systems (though expertise in ML, data science, etc is not needed for this role)

We can’t sponsor visas but relocation assistance to SF is possible.

Please apply here: https://job-boards.greenhouse.io/kinelo/jobs/4088659009 and also email jobs@kinelo.com, mentioning this post.

What makes Squint special?

- Our customers include some of the most iconic manufacturing brands across Food and Beverage, Automotive, and Consumer Package Goods. Work here literally transforms how the world around you is made.

- We're not replacing people with AI, we're up-leveling them; capturing insights, turbocharging workflows on the factory floor, and making every operator an expert.

- We're bringing consumer-grade quality to enterprise software, combining cutting-edge tech with deep customer empathy to build a product that's powerful, magical, and deeply loved by our users.

High Priority Open Roles:

- Applied AI Engineer

- Software Engineer, Backend Infrastructure

- Senior GTM Recruiter

- Senior Accounting Manager

- Director of Enterprise Sales, Energy Sector

- Customer Strategy Partner

- Strategic Enterprise Account Executive

- Senior Sales Engineer

View full list of roles and apply here: https://jobs.ashbyhq.com/squint.ai?utm_source=Hackernews

At Tasklet (https://tasklet.ai/), we're building the world's most powerful AI agent platform for business automation.

We're looking for a staff-level software engineer to share technical leadership of our core agent infrastructure. You'll architect systems for multi-step agent orchestration, state management, trigger systems, and seamless integration with thousands of APIs.

Our stack: TypeScript, React, GCP, Kubernetes, Claude

Looking for: 5+ years experience building production-scale systems, proven technical leadership, experience building AI agents, exceptional programming skills across the full stack.

Compensation: $260k-$330k salary + 0.8-1.6% equity, competitive benefits including medical, dental, vision, 401k, 4 weeks PTO

Apply: https://shortwave.notion.site/Open-Positions-at-Tasklet-2a36...

We are building the AI Operator for growth to replace traditional ad agencies. We apply quant rigor of high-frequency trading to optimize ad spend, delivering 20-50% upside in spend efficiency. We manage spend for global category leaders like Cider and Cupshe with a clear path to managing billions of dollars. We are backed by Quiet Capital and are hiring for multiple engineering roles:

- Member of Technical Staff, Full Stack - https://pepr.ai/careers?ashby_jid=6025c6f4-3b72-4dc6-8a2c-fa...

- Member of Technical Staff, ML & Optimization - https://pepr.ai/careers?ashby_jid=baf0e7ac-164f-4f1d-9938-de...

- Member of Technical Staff, Product - https://pepr.ai/careers?ashby_jid=e6d130a7-29c0-420d-b954-ba...

Please send a note to founders@pepr.ai if you apply.

Shaswat, co-founder & CEO

We're building automation software for the $7T insurance industry, accelerated by AI. Seed stage in terms of headcount (~ 20 people) but Series B in terms of business traction (+ cash-flow positive). We've intentionally stayed under the radar.

- Product has caused customers to literally cry tears of joy

- Experienced eng team from Airbnb / Brex / LiveRamp

- Stack: TS, Postgres, React, GraphQL, and Next.js

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

Taking on the entire insurance industry.

Full stack software engineers. Python and typescript.

https://calendly.com/sam-corgi/session

corgi.insure

Uncountable accelerates R&D for industrial scientists across leading materials, chemicals, and life sciences organizations. With our SaaS solution, our customers get better products to the market in half the time. Uncountable was founded by MIT and Stanford engineers and has been profitable since 2016. Our team has grown from 50 to 100 over the last two years.

Full-Stack Engineers | $120k - $220k + Equity

---> Uncountable is looking for engineers who can spearhead the development of the Uncountable Web Platform. The position is heavily product-driven and comes with challenges across the stack.

--> Summer internships and working student positions are also available.

Learn more: https://www.uncountable.com/hiring/hn

Uncountable is hiring in New York City, San Francisco, London, and Munich.

Contact our CTO directly at jason@uncountable.com

Foxglove is the leading observability & data platform for robotics and physical AI. Our software supports the full data lifecycle, from collection, upload, and storage, to analysis and visualization. We're assembling the most talented team in the industry to build a platform for all types of robots. Sound interesting? Join us!

Many engineering & product roles:

- Data Engineer

- Rust Engineer

- Frontend / Viz Engineer

- Product Designer

- Visual Designer

GTM roles:

- Solutions Engineer

- Account Executive

https://foxglove.dev/careers

Firetiger is building self-driving software operations. We believe the future of DevOps isn't better dashboards (like Datadog), but autonomous agents that monitor, investigate, and remediate issues based on high-level business goals. We are backed by Sequoia Capital and founded by Rustam and Achille, former leaders from Cloudflare and Segment.

We are looking for a Product Engineer to build the interfaces between humans and AI agents running software on behalf of those humans. More here: https://jobs.ashbyhq.com/firetiger/f5d4ba4b-29c8-4f77-bae8-8...

Engineers can't keep up with their production environments: dozens of services, dashboards everywhere, alerts firing. The information to diagnose most issues exists, but finding it takes longer than fixing the problem. AI generated code is making this worse.

Cleric is an AI SRE that autonomously investigates production issues and surfaces findings to engineers. It connects to your existing tools, reasons through the evidence, and tells you what's wrong. We believe engineers should ultimately be accountable in production, and our goal is to help them go much faster.

The hard part is making agents reliable when there's no single right answer. We've built evals, memory systems, and feedback loops that improve with every incident. Gartner just named us a Cool Vendor, we are well funded with years of runway, and most importantly the engineers that use our product find it very sticky.

We're hiring the following roles:

- Staff SWE, AI: Build the reasoning engine. Design evals, debug agent behavior (not just code), expand what it can handle. You've built agents and operated distributed systems at scale.

- Staff SWE, Product: Define what AI SRE should be. Spend time with engineers during incidents, find gaps, decide what to build. You've owned products and know production pain.

- Head of Marketing: Engineers love the product but we need to reach more of them. Software engineers are allergic to AI hype, and you'll need to cut through it. Technical background required.

Apply: https://jobs.ashbyhq.com/cleric Or email me: willem-hn@cleric.ai

Willem, Co-founder & CTO

Rainbow is a tech-enabled small-business insurer. We built software that underwrites small businesses (starting with restaurants) and evaluates them against various risks to provide them with insurance policies. We've been live for only 2.5 years but already one of the top insurers of restaurants in the US. We are looking for an experienced software engineer to join our team and help us grow and innovate. We've raised around $20m to date with a series A around end of 2024. We've grown massively over the past year. Most of our problems we're currently working on are about building tech as we expand out to other categories of insurance and insuring other types of businesses.

Job Requirements:

- 5+ years of professional experience as a software engineer

- Experience in fintech is an optional but major plus

- Familiarity with our tech stack (Golang, React through a Next.js app, GraphQL, PostgreSQL) is beneficial but not required

Why You’d Enjoy Working with Us:

- You're joining a small fast paced team: 12 engineers, 40 people total

- Direct impact on solving real-world problems for small businesses

- Hybrid work model with 2 days on-site in SF

- Competitive salary and benefits

If interested, please reach out at hn@userainbow.com with your resume attached to the email.

You can also visit our site to learn more: https://www.userainbow.com/about

Scorecard is the simulation platform for self-improving AI agents. We help teams encode expert judgment into reward models and run 10,000s of scenarios in minutes instead of reviewing 10s of production cases over weeks.

Our team built simulation systems at Waymo, Uber ATG, and SpaceX. Same discipline, applied to AI agents. Backed by Kindred Ventures and Neo, with multi-billion dollar customers.

Founding Software Engineer ($175k-$250k + equity)

Build infrastructure for large-scale agent simulation, reward model pipelines, and scenario generation. Ship fast with a low-ego team.

Stack: TypeScript, React, Node.js, Postgres. Bonus: LLM/RL experience, founder background.

https://www.scorecard.io/careers/software-engineer

Founding GTM Lead

Own demos, sales playbook, and positioning for AI teams building frontier agents. 3+ years early-stage sales/product marketing. AI/developer tools experience a plus.

https://www.scorecard.io/careers/founding-gtm

In-person in SoMa. Full benefits, daily lunch, unlimited PTO.

Apply: jobs [at] scorecard.io (mention HN)

Brilliant is building world-class interactive learning experiences that combine challenging problems, compelling narratives, and delightful visual storytelling.

We're hiring an Android engineer to help craft the next generation of interactive learning and change how the world learns.

Engineers at Brilliant think about both "building the right thing" AND "building the thing right" while pursuing high standards of excellence for ourselves, our product, and our codebase.

If you're energized by the prospect of doing the best work of your career and changing how the world learns alongside the most talented peers you've ever worked with, you can learn more and apply here: https://brilliant.org/careers.

We’re building a general AI for humanoid robots using world-model-based reinforcement learning trained on large-scale real-world data.

This is a founding engineer role. You’ll work directly with the founders and own core parts of the training and data systems.

Work - Build data pipelines for large-scale multimodal robot datasets - Scale pre- and post-training runs to large GPU clusters - Improve inference efficiency on low-power embedded systems

Stack: Python, PyTorch, Kubernetes, Ray, Lance, dora-rs

Contact: alex [at] tau-robotics.com

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!

Senior Robotics Software Engineer: https://jobs.ashbyhq.com/charge-robotics/b2aa347c-4738-4065-...

Senior Mechanical Engineer: https://jobs.ashbyhq.com/charge-robotics/19133a2e-f262-4f3d-...

Lots more: https://jobs.ashbyhq.com/charge-robotics

RunReveal is the Security Data Platform that's building tools to help companies detect and respond to threats in their network. We're a team that values speed, quality and curiosity. Our stack is Go, NextJS (TS), Postgres and ClickHouse. We believe that companies should be able to own their security data and get value out of it too and so we've built a platform that can be deployed anywhere. SIEM sucks, so we're here to fix it.

If you're into self hosting or running a homelab, or you're using LLMs to enhance your development workflow and extend your knowledge and not just regurgitate slop, or you're always looking for opportunities for self improvement, you're in good company at RunReveal.

We've got phenomenal customers like Cursor, Harvey, Temporal, Linear, DigitalOcean, ClickHouse and AngelList among many others that we work with on a daily basis to improve the product.

We're especially interested in folks that have experience working with petabyte scale databases. We use ClickHouse, but experience with other similar large scale data technologies like Iceberg, Flink, Spark, ScyllaDB, Cassandra, InfluxDB, TimescaleDB, BadgerDB etc would also be valuable.

Reach out to me via alan at the company domain and mention hn who's hiring January '26 in the subject line.

Gobii is the easiest way to deploy browser-use agents in the cloud or on-premises. We're building an open-core AI workforce platform—browser-native agents and automation tools. We have paying customers.

The entire team contributes to browser-use. We also have contributors to Apache NiFi, LiteLLM, and RA.Aid (open-source coding agent I created). Open source is core to how we build and how we think. We're backed by Open Core Ventures.

HQ is San Francisco, but much of the team is in the DC area. East Coast timezone preferred, DC area even better—but we're fully remote.

What we're building: The orchestration layer for browser-use and AI agents. Systems that navigate, reason, and execute on the real web.

Who we're looking for: You've built agentic systems that shipped to production. You have opinions about tool use, context management, and why most "agents" are just glorified prompt chains. You strongly prefer working in the open—a significant part of this role is contributing to OSS repos. We strongly prefer candidates with existing open source contributions.

Why now: We have strong traction and are expanding the team. You'd be early—with real influence over product, architecture, and how we work. High autonomy, high trust, small team of people who know what they're doing.

Comp: Cash + healthcare + modest 401k match + options. In line with SF-based VC-backed startups at pre-seed stage.

Stack: TypeScript, Python, browser automation, LLM orchestration.

Email: careers@gobii.ai (subject: "HN")

We're building an agent to manage single family rental properties across the United States. We currently manage ~4,000 homes, are growing quickly, and are looking for full stack, backend leaning engineers who would love to contribute to a state of the art agent.

I've written a bit about our culture + product before:

-> What it means to be "in-person" with our customers: https://medium.com/@maspinwall22/being-there-5c167dd8b163 -> LLM Communications in the wild: https://medium.com/@maspinwall22/llm-communications-in-the-w...

If interested, reach out directly to me: michael@thisismason.com

- Senior Backend Engineer | SF, Remote (North America) | Full-time | $170-225k + equity

- Software Engineer | SF, Remote (North America) | Full-time | $140-200k + equity

- Forward-Deployed Product Manager | SF | Full-time | $120-170k + equity

- Growth Chief of Staff | SF | Full-time | $105-$135k + equity

- CSM | SF | Full-time | $120-170k + equity

- Account Exec | SF | Full-time | $120-270k + equity

https://neonhealth.com

We’re mission-driven capitalists: making life-saving drugs more accessible, and building a $200B+ company on the scale of Palantir or ServiceNow.

Traction: profitable and growing fast. Selling 7+ figure contracts to enterprise healthcare customers.

Team: built by exited founders, YC & MIT alum, ex-Tesla, ex-Google engineers.

Top investors: funded by elite Silicon Valley VCs who've backed unicorns like DoorDash, Lyft, and Mammoth Biosciences. And strategic healthcare investors with deep industry connections.

Outsized impact & opportunity: work at the intersection of agentic AI, healthcare transformation, and life-changing patient outcomes.

If you want to work on a team of A-player athletes, doing the best work of your career, and helping get life-saving drugs to the people who need them, apply here: https://neonhealth.com/careers#open-positions (and make sure to mention HN!)

Conductor lets you run a team of coding agents on your Mac. We launched in July through Show HN, and are used by engineers at companies like Linear, Vercel, Notion, Stripe, and YC.

We’re on a mission to build the human interface to AI organizations. We’re a team of four looking for one or two more exceptional engineers or designers. No AI experience needed, just some enthusiasm for the awesome alien power of LLMs.

https://www.ycombinator.com/companies/conductor/jobs/MYjJzBV...

Marketing Lead (Developers) - Remote friendly | Tech Lead (CI & Test Data Platform) - San Francisco| Senior Platform Engineer - San Francisco | DevRel Engineer - San Francisco|

Trunk is an a16z funded (25M) Series A dev tools startup, redefining software development at scale. At Trunk, our mission is to help teams create high-quality software quickly. We've helped engineerings teams at: Google X, Zillow, and Brex to understand why their builds fail, which tests are flaky, and how to ship code faster without sacrificing reliability. AI has made writing code 10x faster, but shipping is still painfully slow. The bottleneck has shifted downstream - to merge conflicts, flaky tests, inconsistent code quality, and dozens of other frictions that drain productivity and morale. Engineering teams that can stay focused on designing, implementing, and delivering software will build magical, high-quality projects - and they'll be happier doing it. We're building a CI Reliability Platform that empowers teams to land code faster and develop happier!

Our products:

Unlimited PTO (and we all actually take PTO), competitive salary and equity packages! Please apply here: https://trunk.io/jobs

Marker is a technology venture from 3 leading communications agencies. We’re an incubator building and launching force-multiplying software products for communications teams.

Our first product is Delve (https://delve.news) — a coverage monitoring, analysis, and insight toolkit to track and measure the entire online conversation about your business or industry.

Our product team is small and autonomous, but with the resources, expertise, and customer access of the global agencies we work with. We’re hiring an early engineer to join us on this journey; you’ll have a large impact on what we build, how we build it, and where we’re going next.

Our current technology stack includes Deno, React, and PostgreSQL. Bonus points for expertise in any of: data visualization, distributed systems, web scraping, large-scale data pipelines.

Contact: dylan (at) company domain. No recruiters or agencies, please.