Checkr (https://checkr.com) |

Checkr (YC S14) is hiring across multiple roles, located in our San Francisco, Denver, and Santiago offices. Checkr builds people infrastructure for the future of work. We've designed a faster—and fairer—way to screen job seekers. Established in 2014, Checkr puts modern technology powered by machine learning in the hands of hiring teams, helping to hire great new people with an experience that’s fast, smooth, and safe. Checkr has over 100,000 customers including DoorDash, Coinbase, Lyft, Instacart, and Airtable.

A career at Checkr means collaborating with brilliant minds, disrupting an industry, and opening channels of employment to often overlooked candidates. Checkr is recognized on Forbes Cloud 100 2025 List and is a Y Combinator 2024 Breakthrough Company.

Here's a selection of roles:

Software Engineer (SF/Denver): https://grnh.se/qc3k3i6f1us

Senior Software Engineer (SF/Denver): https://grnh.se/l23t79if1us

Engineering Manager (SF/Denver): https://grnh.se/9m52v0151us

Staff Reliability Engineer (Chile): https://grnh.se/r7wj6h6x1us

Staff Product Manager (SF/Denver): https://grnh.se/besth6lw1us

Sr. Director, Product (SF/Denver): https://grnh.se/xexlcik21us

I'm a Sr. Staff product manager here in our SF office 2x/wk. Happy to answer questions you might have!

All jobs: https://grnh.se/f3c7e1c61us

Artificial Analysis | https://artificialanalysis.ai | Full Stack Engineer, ML Engineer, Member of Technical Staff | Onsite in San Francisco or in Australia/New Zealand | Competitive Salary + Equity

Artificial Analysis is an independent AI benchmarking and insights provider. We benchmark AI to help engineers and companies understand AI and make informed decisions regarding which AI technologies to use. We are fast growing with a team of 20 and have backing from investors including Nat Friedman, Daniel Gross & Andrew Ng.

We are hiring for four roles:

1. Full Stack Engineer: Full Stack Engineer to support our benchmarking of AI and with communicating these benchmarks to our users. Proficiency in Typescript & Python required. Familiarity with LLM APIs preferred. Tech stack: Javascript/Typescript, Node.js, React/Next.js, Python.

2. ML Engineer: ML Engineer to support our benchmarking and evaluation of AI software stack. You will design and run benchmarks and evaluations of different AI models. Strong analytical skills and proficiency in Python required.

3. Member of Technical Staff: You will design evaluations of different AI models and work to translate technical insights to analysis that helps companies navigate AI.

Apply at hiring (-at-) artificialanalysis.ai with your resume, github and dot points on relevant experience (including anything you've built). Add | HackerNews to email subject line.

Sphinx Defense | Engineering, DevOps, & Product | Remote (US Only), DC, Colorado Springs, LA | https://www.sphinxdefense.com

Sphinx Defense builds software to solve complex national security problems for America and its allies. Founded by engineers and technologists with deep experience across commercial and defense technology, we're building a vehicle-agnostic communication infrastructure to enable satellite operators to securely utilize antenna networks and maneuver satellites in real-time. We're bootstrapped, profitable, and growing aggressively.

To learn more about who we are, our engineering culture, and whether this is the right place for you, read our Key Values profile: https://www.keyvalues.com/sphinx-defense

Our current openings are: Sr. Backend Engineer - Colorado Springs : https://grnh.se/dx02hydm8us

Sr. Backend Engineer - Remote : https://grnh.se/dx02hydm8us

Product Manager - Colorado Springs - https://grnh.se/dx02hydm8us

Program Manager - Colorado Springs - https://grnh.se/dx02hydm8us

Sr. Program Manager - Colorado Springs - https://grnh.se/dx02hydm8us

Don’t see a role that aligns with your interests or don’t have the specific Space/ Command & Control experience? Apply to the general interest application and list what type of role you would be interested in : https://grnh.se/4ce199d68us

NeuroVRD | Quality Assurance Engineer | Remote | Contractor + Equity We're building the Sentinel AI-IONM system: an AI-driven system that monitors neurovascular integrity in real time during high-risk surgery. This role is for someone who wants genuine ownership of a hybrid hardware/software QMS and wants to be close to the regulatory and engineering core of an AI SaMD company.

You'll own and operate our Quality Management System across multiple devices (SaMD + hardware) and be directly responsible for FDA/ISO-aligned documentation, design controls, supplier quality, clinical-quality support, and software validation oversight. You'll work directly with the COO, CTO, and our Director of Clinical Research.

Please email Joan at jmeo@neurovrd.com with a resume & cover letter about why this work matters to you.

Onlook (https://www.onlook.com/) | Founding Engineer (Fullstack / AI) | San Francisco or REMOTE (US) | Full-time

Onlook is an AI-native visual editor that lets designers, PMS, and engineers collaborate directly in the browser. We launched earlier this year, hit #1 on Hacker News, became the #1 trending repo on GitHub (above DeepSeek + Anthropic), and have grown to 22,000+ stars. We’re now hiring our first Founding Engineer.

We’re a design-led, product-obsessed team backed by YC, and we’re building a next-generation visual IDE used by tens of thousands of designers and engineers.

What we’re looking for:

• Full-stack engineer comfortable owning large, ambiguous problems

• Strong bias toward building fast and shipping often

• High craft, strong opinions, and willingness to defend them

• Desire to build an open-source product in public

• Someone who wants to help shape the culture, architecture, and direction from day one

Tech: Next.js, Tailwind, tRPC, Supabase, Drizzle, Bun, Docker, Anthropic, AI SDK.

What you’ll do: You’ll work across the stack, contribute to one of the fastest-growing OSS projects ever backed by YC, design and ship core parts of the visual editor, work with 100+ contributors, and help define the product with real users. If you’re in SF, we have a beautiful office near South Park.

How to stand out: Share something you’ve built. A project, repo, or portfolio tells us more than a resume.

Email me directly daniel@onlook.com or apply at https://www.ycombinator.com/companies/onlook/jobs/e4gHv1n-fo...

Hiring: MouseMux | Remote (EU-friendly) | Part-time (8-16h/week) | Community + Outreach + Content

I’m the solo developer behind MouseMux (mousemux.com) - a Windows tool that enables multiple users / multiple cursors on one desktop (local + remote). It’s used in trading / multi-monitor setups, simulator & control-room (SCADA-ish) environments, classrooms, and other collaborative workflows. MouseMux is at a turning point: a wave of major new functionality is landing, especially around remote multi-user collaboration. The product is becoming significantly more capable, and I need someone who can translate that to the world - clearly and genuinely, in the niches where it shines. You’ll be the “spider in the web”:

* Talk to existing customers, capture use cases, keep relationships warm * Create simple content (short screen-recorded videos, posts, case snippets) * Find look-alike companies/institutions and do human, non-spammy outreach * Coordinate with relevant creators (YouTube/bloggers) for deep-dives * Occasionally post in relevant communities (Reddit/Discord/forums) transparently and helpfully No coding required, but you should be comfortable with technical users and Windows tooling. I’m optimizing for someone autonomous who can run with outreach + content.

Comp: contract, €60–€120/hour depending on fit, 8–16h/week. Start with a small paid test project. Bonus possible for meaningful outcomes (pilots/case studies/revenue growth).

Email: info@mousemux.com with (1) short intro, (2) 1–2 examples of content/outreach, (3) why MouseMux.

Stargazr | Lead Integration Engineer (Path to Architect) | Fully remote | https://stargazr.ai

We are a small startup (<10 employees, 3 developers, recently post-revenue) in the analytics and simulation space. We sit on top of ERPs and production systems to provide financial and operational analysis for project-based manufacturing (aircraft, robotics, automotive).

Our stack is Python (Flask and Pandas), Vue 3, PostgreSQL and Clickhouse. Our infra is simple self-contained EC2 machines. We operate with high ownership, letting you impact both technical and strategic decisions.

We are looking for a senior engineer (5-10+ years) to own our integration process. You must have hands-on experience building data ingestion pipelines and ideally a background in technical pre-sales. You will start by shipping these integrations and evolve into a Solutions Architect role as the system and team mature.

To apply, please send your CV and a short background to hn-202512@stargazr.ai

StorPool | Senior Software Engineer - Storage Core (C/Linux) | Remote (UTC-1 to UTC+5) | Full-time | Multiple roles

StorPool is building the future of data storage. Our software runs at the heart of modern clouds, delivering <100µs latency, 113M+ IOPS per cluster, and 99.999% availability. We're profitable, self-funded, and our customers love us (NPS off the charts).

We're looking for a Senior Software Engineer to join our Core Storage team. You'll tackle genuinely hard problems: writing custom Linux drivers, optimizing lock-free data structures at nanosecond scale, building fault-tolerant distributed algorithms, and debugging issues that go all the way down to kernel internals. This isn't CRUD work - it's systems programming at its most challenging.

Competitive salary, fully remote, meaningful time off, and a yearly education budget to keep learning.

If you get excited about shaving microseconds off I/O paths and building infrastructure that simply doesn't break, we should talk.

Apply here: https://storpool.com/force/senior-software-engineer-storage-...

Pinetree | Remote (North America, GMT-8–GMT-5) | Full-time | Salary + Equity

We’re hiring our third team member, a full-stack engineer, to work directly with the founders across the Pinetree codebase. If you were here today, you’d be shipping notifications, building out the creator studio with analytics and video management tooling, and improving our Farcaster mini app experience and onchain features like direct payments to creators.

Pinetree is building the best onchain platform for video creators: a crypto-native alternative to ad-driven video platforms that gives creators real ownership over distribution, monetization, and their content. We’re looking for someone highly autonomous who brings solutions to complex problems and wants meaningful product and company ownership.

You should have experience writing and deploying production software in TypeScript, ideally on a small (<50 person) team or other startup environment, and be comfortable working across the stack (React / React Native / Next.js, Node, Postgres). Crypto or social product experience is a plus.

Stack: TypeScript, React, React Native, Next.js, Node, Postgres

Comp: $120–200k base, 1–4% equity, health/dental/vision, unlimited PTO, remote-first, $2,500 home office budget.

Reach out to giu@pinetree.so with a resume or links to work you’re proud of.

FUTO | Austin, TX | On-site / Remote | Full Time

FUTO is an organization dedicated to developing, both through in-house engineering and investment, technologies that frustrate centralization and industry consolidation. Our work consists of a combination of in-house engineering projects, targeted investments, generous grants, and multi-media public education efforts. Our principles are here: https://futo.org/about/what-is-futo/

Machine Learning Engineer - FUTO Keyboard

FUTO Keyboard is a privacy-first software keyboard for Android. Every prediction inference routine runs entirely on-device; no user data can ever leave the device. We support over 150 keyboard layouts and languages, and over 700 layout + language combinations (not all of them include dictionary or predictions)

Swipe typing is an important part of the mobile typing experience for many. Applying machine learning here poses a unique challenge due to the requirement of needing to support so many layouts and languages, as well as user-added personal dictionary words (or even layout customizations!), with limited data. We have previously collected and publicly released a US English QWERTY dataset: https://huggingface.co/datasets/futo-org/swipe.futo.org/

We are looking for a machine-learning researcher or engineer to work through these challenges and help us improve the swipe typing experience in FUTO Keyboard.

More info here: https://futo.org/jobs/machine-learning/

To apply, send your resume and cover letter to jobs at futo dot org with the subject of the position you're interested in.

Comulate | Senior Engineer (3+ YoE) | ONSITE in San Francisco, CA

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

BambooHR | multiple roles (engineering, IT, more) | REMOTE or US-based | Full-time | https://www.bamboohr.com/careers/engineering-it-team

At BambooHR, we build the HR software millions of employees and organizations use to manage their people operations. We believe in giving teams autonomy, building with care, and delivering a great user experience, all while supporting a healthy, balanced work-life culture.

We’re hiring across engineering, IT, and related teams. Whether you’re a backend engineer, full-stack developer, SRE/DevOps, or IT support wizard we may have a spot for you. Many of these roles are remote-friendly for US-based candidates.

For full details and to apply, see our open positions: https://www.bamboohr.com/careers/engineering-it-team

Silkline | Onsite, Seattle (5 days/week) | Full-time | Salary+Equity We need help! and are looking to hire multiple full-stack or frontend engineers at Silkline.

Today, the way modern hardware supply chains work is like fax woke up in 2025 - spreadsheets, email, PDFs, and a lot of sadness. We are fixing this antiquated system and building the AI-first platform to power the future of supply chains. Initially, we are focusing on the rising defense, space, and nuclear sectors.

Over the last year, we have grown considerably (5x'ed customer count), just announced our Seed round, and brought on some massive logos in the industry. Join me and our deeply customer and product-oriented team, which has been shipping incredibly fast.

Stack: Typescript, React, Next.js, Hasura, Trigger.dev, AWS, Pulumi, Elbow grease

Reach out to brent@silkline.ai or apply: https://jobs.gem.com/silkline/am9icG9zdDrLwsEQTKKa02Ut_F9kgz...

RINSE | REMOTE or San Francisco, Los Angeles, Chicago, Boston, New York, New Jersey, Seattle, Austin, Dallas, Toronto, or Washington DC | Software Engineer | Full-Time | https://www.rinse.com

Rinse provides dry cleaning and laundry delivery services to customers in twelve metropolitan areas in the US and Canada. We have sophisticated logistics optimization software, a polished consumer product, and firm business fundamentals. We're now over a decade old - this is a stable, yet consistently growing and innovating, company.

Our engineering team is distributed across the United States and internationally, and has been entirely remote for years now, but a desk can be provided in the above cities if you'd prefer.

We're open to both newly-graduated engineers or more senior engineers, provided they meet our bar. We're particularly interested in true full-stack engineers, with strong React / Typescript / CSS skills to complement comfort in a Python / Django environment. We're also seeking engineers with experience leveraging AI to automate complex operational processes.

Search term bingo: Logistics, Django, Python, Optimization, React, React Native, Postgres, Mobile Engineer, Automation, Delivery

https://www.rinse.com/careers/software-engineer/

Cosuno | Senior Full Stack Developer (TypeScript) / Senior AI Engineer – LLMs & Agents | Remote (EU) / Berlin | Full-time | https://www.cosuno.com

Cosuno is a fast-growing tech startup reshaping the construction industry with a digital platform for procurement. We use AI to analyze millions of price points, helping construction companies create bids based on real market data. We're looking to expand our team with creative minds who want to solve real-world problems and impact a massive industry. We are an open-minded, collaborative, and international team.

Currently, we're hiring for two key senior roles:

---

Senior Full Stack Developer (TypeScript)

Location: Remote (EU) / Berlin

Stack: TypeScript, React, Node.js, Cypress, Kubernetes, AWS

Mission: Take full ownership of features, shaping both the frontend and backend of our product. You'll have the responsibility to extend and build upon our platform to make it more valuable, reliable, and maintainable. We value a trunk-based development workflow with daily releases, comprehensive end-to-end testing, and a solid CI/CD pipeline.

You have: 5+ years of hands-on engineering experience, substantial expertise in JavaScript/TypeScript, and experience with Node.js (React is a plus).

---

Senior AI Engineer – LLMs & Agents

Location: Remote (EU) / Berlin

Mission: You will build agentic workflows using state-of-the-art LLMs. Lead the technical development of an agent that helps construction professionals process, improve, and validate complex construction documents. A key part of your role will be establishing and enforcing MLOps and LLMops best practices.

You have: 5+ years of engineering experience, with at least one year working with LLMs. You possess strong Python skills, a proven track record of deploying containerized services (Docker, Kubernetes), and deep expertise in at least one of the following: deep learning (PyTorch, Transformers), ranking/matching algorithms, or LLMops (RAG, evals, fine-tuning).

Interested? To apply and for more detailed information, please see the full job descriptions on our careers page: https://www.cosuno.com/en/company

The coding interview question involves a collection of points (places) on a 2D grid. Places and Queries against those places are listed in sequential order in a commands.txt file in a colon-seperated format. A query is a circle with a center point and radius, along with a collection of 0-N expected places contained within it.

    Place - id, x, y
    Query - id, x, y, radius, expected return values (comma-separated)

The task is to persist the places data in sequence and ensure queries return the set of expected places out of all places that have been seen so far. This is a basic geometry problem - if the euclidian distance (x^2 + y^2 = r^2) between any place and the circle's center is less than the radius, the place is contained in the circle. You should anticipate thinking of ways to optimize once the dataset gets very big if you successfully complete the specific task within the allotted time.

    # commmands.txt example

    place-1:34.7:94.5
    place-2:54.1:5.2
    query-1:15.2:17.1:5.0:                  # no results expected
    place-3:44.9:27.4
    query-2:35.0:94.0:2.0:place-1           # one result expected
    ...
    query-100:50.0:30.0:place-27,place-64   # multiple results expected
    ...

MixRank (YC S11) | Software Engineers | 100% REMOTE (Global) | Full-Time MixRank processes petabytes of data every month from web crawling. We have hundreds of customers using our data products including Google, Amazon, Facebook, Intel, and Adobe, across industries including Finance, Recruiting, Sales, Marketing, and Security.

We’re a fully-remote company with a global footprint in over 20 countries. We're growing, profitable, employee-owned, no dependence on outside funding. Applicants from all geographies and backgrounds are welcome.

We are looking for passionate individuals for whom programming is not just a job but it’s something they love to do. We're obsessed with computers, programming, big data, databases, compilers, hardware, math, data science, and the internet. Does this sound like you? Please apply to join our team.

Our code base is very friendly to new contributors. You'll have a fully-functional development environment within hours (fully automated) and be pushing commits on your first day. Deployments to production happen multiple times per day and finish in less than 2 minutes. Effectively all of our codebase is written in Python, Rust, SQL, Javascript/TypeScript, and Nix. The core technologies you'll need familiarity with to be productive are Python, PostgreSQL, Linux, and Git.

We operate at a larger scale than typical startups. We operate two datacenters with high performance servers we've built that are capable of dealing with the volumes of data we process. We've implemented our own distributed file system. We do full-scale web crawls. We download and perform static analysis on the entire universe of Android APKs and iOS IPAs that are published. Unlike a typical startup where you'll spend half of your time in meetings, and the other half fixing bugs from Jira tickets— at MixRank you'll get to challenge yourself with difficult technical problems that will help you to grow as an individual.

We're hiring continuously for the positions below— they aren't singular positions that will close once filled. Our philosophy on hiring is that the candidate is more important than the position. For each new member of the team, we design a custom role and responsibilities that are specialized to their interests. Other companies will come up with a long list of specific requirements for a position with the expectation that you'll exactly replace someone from the team, or that you'll be the perfect tetris piece that satisfies the job requirements decided by a committee. MixRank is more pragmatic: we'll first get excited about having a unique individual on the team, then we'll figure out the best way to accommodate their specific talents.

-- Junior Software Engineer - Remote (Global), Full-Time

We're looking for remote junior engineers that have 0-3 years of professional experience in software, and 5+ years of curiosity exploring computers, programming, and technical hobby projects. This is an open-ended entry role with mentorship and diverse opportunities to work on all areas of our product: databases, distributed systems, infrastructure and tooling, data analysis, machine learning, frontend/backend web development, APIs, data mining, data modeling, and more. To stand out, please highlight what makes you unique: passion for computing, curiosity and side projects, work ethic, niche research, etc.

Ideally you've already graduated, but if you still have one or more years left of school, please feel free to apply anyway, and if you're the right fit for the team we'll figure out a way to accommodate your schedule.

https://www.ycombinator.com/companies/mixrank/jobs/Fnwsojk-j... --

Software Engineer - Remote (Global), Full-Time

We're hiring generalist software engineers to work on web applications, data mining, machine learning/data science, data transformation/ETL, data modeling, database scaling, infrastructure, devops, and more. We'll cater the role to whatever subset of these areas match your interests.

Beneficial experience includes PostgreSQL, Python, Rust, Linux, TypeScript, Nix, frontend/backend web development, and data mining.

https://www.ycombinator.com/companies/mixrank/jobs/RXQspen-s...

--

I’m Kiran, Chief of Staff (CoS) at MixRank, a fully remote data startup building go-to-market intelligence. We’re US-incorporated but hire globally, and we’re bringing on new teammates to join a fast-moving team with real ownership and impact.

Goody | Remote | $200–250K + equity and benefits | Full-time

Goody is hiring a full-stack Staff Software Engineer who likes to ship at a startup pace and has an eye for exceptional UI/UX.

I'm Mark, the technical co-founder and CTO at Goody. Despite being something everyone does, gifting is one of the areas of commerce yet to be disrupted. Our goal is to make people's days by making gifting easy, while building a sustainable business on that market opportunity.

We're looking for engineers who like to build at a startup pace, have a critical eye for detail and user experience, and thrive when given autonomy and ownership.

Our product is used by Google, Stripe, Anthropic, Meta, NBCUniversal, Notion, and others, and we also offer a developer API for commerce.

Check out our jobs minisite at https://jobs.ongoody.com/swe and feel free to email me at mark@ongoody.com.

Foundation Source | Remote (US, Canada) | Full-time We're expanding our team and looking for passionate individuals to join us in building innovative solutions for philanthropy in the DAF team (we provide the technology that runs the Charityvest DAF). Our current openings include:

Senior Software Engineer, Back-end, DAFs: Design and implement core products for our Donor-Advised Fund (DAF) offerings, using a modern fully serverless event-driven architecture in AWS with TypeScript and Postgres.

Senior Software Engineer, Front-end, DAFs: Craft exceptional, high-performing user interfaces for our DAF platform, using modern React 18+ and Next.js 14+ features.

If you're passionate about fintech and making a meaningful impact in the world of charitable giving, we'd love to hear from you.

Feel free to email me your CV and I'd be happy to share more details: edmundo+hn [at] charityvest [dot] org

HomeVision | Multiple Roles - Eng, SRE, Analytics | Hybrid SF & Remote | Full-Time | $100k-$220k + equity We have three open roles:

- Engineer - Hybrid SFO I'm looking for an junior-to-senior software engineer to work with me (CTO) directly. Our systems process millions of pages of documents a month for the mortgage industry. We work with some of the largest lenders in the country and are at the forefront of applying LLMs and other multi-modal models in this industry.

New-grad and junior engineers particularly encouraged to apply. Looking for people who are motivated to write good code with a good mix of practicality and aesthetics.

- SRE - US Remote (SFO or Seattle preferred) - This is a broad role on the platform team including AWS infra w/terraform, software engineering, and IT

- Analytics Engineer - US Remote (SFO or Seattle preferred) - Another broad role that includes managing the data warehouse, building durable and ad-hoc reports in sql and python, and doing deep analysis.

Please apply here: https://jobs.ashbyhq.com/homevision/a3f79d43-5d9e-46bf-a43f-...