Antithesis | Distributed Systems Breaker Extraordinaire | Full-time | SF or London or DC

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Have you always wanted to channel your inner Kyle Kingsbury? We are looking to hire somebody with a deep understanding of distributed systems who can bring open source or customer software under test in our platform and find fun issues in it.

Preferred locations: SF, London, DC. Remote is a possibility for this role if you're really good (though be aware that we're a very in-person company culturally speaking, so it might be annoying for you).

To apply: email 'will' at our company domain with a description of something interesting that you've worked on.

Schoolhouse | Senior Software Engineer | REMOTE (US time zones) | https://schoolhouse.world/

Schoolhouse.world is a non-profit founded by Sal Khan with the mission of connecting the world through learning. Our peer tutoring platform brings genuine human connection to online learning in a world that’s being rapidly disrupted by AI. So far, we’ve reached 150k+ learners from 180+ countries and plan to grow to millions.

You'll be one of six engineers owning full-stack projects from ideation to execution and making an impact on learners and tutors across the world. Our ideal candidates move quickly, have good taste in code, and are AI-forward (eg experience building LLM evaluation frameworks) but still believe humans bring deep value to engineering and education.

Stack: TypeScript, Node, Next.js, React, PostgreSQL, AWS

Compensation: $175K-$200K

Perks: Fully remote, flexible hours, competitive salary + benefits, work-from-home stipend, semesterly retreats

Apply here: https://jobs.ashbyhq.com/schoolhouse-world/4a6b99f6-9f70-4f1...

Ask questions: evan [at] schoolhouse.world

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.

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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...

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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.

Credit Genie (https://creditgenie.com/) | Onsite | NYC/Philadelphia/Pittsburgh

Credit Genie is a mobile-first financial wellness platform designed to help individuals take control of their financial future. We leverage artificial intelligence to provide personalized insights and are building a financial ecosystem by offering tools and services that provide instant access to cash and building credit. Our goal is to empower every customer to achieve long-term financial stability.

Critical Open Roles - Engineering, AI/ML, Product, Design:

* Software Engineering Manger, Mobile: https://jobs.ashbyhq.com/creditgenie/af8cbaca-5c9d-407a-a085...

* Staff Software Engineer: https://jobs.ashbyhq.com/creditgenie/59213905-bf07-4a8c-9c7e...

* Senior Frontend Engineer: https://jobs.ashbyhq.com/creditgenie/425a5741-dc5e-46fe-89fc...

* Staff Android Engineer: https://jobs.ashbyhq.com/creditgenie/49c678d9-3690-4f31-9c17...

* Staff iOS Engineer: https://jobs.ashbyhq.com/creditgenie/1fe564fe-dd61-4a39-91a5...

* Machine Learning Engineering Lead: https://jobs.ashbyhq.com/creditgenie/c1493ab5-3422-4536-8c4d...

* Staff Software Engineer, ML: https://jobs.ashbyhq.com/creditgenie/ed4fb884-7e35-44ab-8abf...

* Senior Product Manager, Card: https://jobs.ashbyhq.com/creditgenie/eec612e5-351b-43cc-9b14...

* Head of Design: https://jobs.ashbyhq.com/creditgenie/c45e0cf2-2b99-4c89-9764...

* Senior Product Designer, Mobile: https://jobs.ashbyhq.com/creditgenie/8e2a2e47-d4fd-459d-98b5...

We recently raised our Series B from notable venture capital firms, including Khosla Ventures and PayPal Ventures. We have strong unit economics and are on track to (more than) double our revenue growth this year. These are super positive signals for our company, emphasizing product market fit and stability as an early stage startup that's well positioned for continued growth.

Interested? Apply directly via the above links.

Rally UXR | Remote | Full-time | Senior/Staff Backend Engineer | $190k–$225k | 0.10%–0.50% Equity

We're building the leading User Research CRM (rallyuxr.com)

Apply here:

https://www.ycombinator.com/companies/rally-uxr/jobs/Ku40MR7...

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At Rally, we believe talking to your users is the key to building great products. Our platform is used by teams at Google, Figma, GitLab, MongoDB, and more to streamline every step of the user research process in one tool.

We’re a remote-first, Series A startup with a small, senior team of builders. While we’re remote, we value connection—hosting regular in-person offsites and providing a yearly remote office stipend.

As a Senior/Staff Backend Engineer, you’ll be central to scaling Rally’s systems to power hundreds of millions of participant records and billions of events. You’ll own core infrastructure like email/SMS delivery, data pipelines, search, and workflow automation—and lay the foundation for new AI-driven features.

We’re fully built in TypeScript and use AWS, Postgres, ElasticSearch, Kafka, and Temporal. No requirements to have previous Typescript experience, but need to be willing to learn.

Join us if you love building for scale, value craftsmanship, and want to shape the backend foundation of a fast-growing product used by the world’s best product teams.

Matcha | Full-Stack Engineer | $160K-$190K + Equity | REMOTE US/CA | https://matcha.fm/apply

We're looking for a full-stack engineer who thrives in fast-moving startup environments.

What you'll do:

Build new products and features from 0 → 1 Own projects end to end — from concept to shipping Collaborate closely with product, design, and leadership Deliver real value to users and help scale a growing platform

What we're looking for:

3+ years building applications Strong with TypeScript, React, Next.js, Node.js, MongoDB, AWS Startup or scale-up experience Excellent communication, ownership, and proactive mindset

Compensation: $160K–$190K + competitive equity

Location: Fully remote (US & Canada). Optional in-person collaboration at SF HQ.

Apply: https://matcha.fm/apply

Remake.ai | Full Stack Engr; Founding Software Engr | Full-time | Remote (worldwide)

Apps for robots - home vacuums, quadrupeds, drones, humanoids, etc. Think Apple remaking ordinary phones into smartphones with apps & app store - only for robots.

Status: $1M pre-seed, prototype MVP works, pre-traction, ~16K ARR, manufacturing partnership(s) forming, headcount 2 full-time + 3 part-time

1. https://www.linkedin.com/jobs/view/4320217892/ Full Stack Engineer 2. https://www.linkedin.com/jobs/view/4294520255/ Founding Software Engineer (or Cofounder)

Email iliao at remake dot ai

Matta (https://matta.ai) | Industrial Computer Vision/AI for Manufacturing | UK – London (Old Street) | ONSITE | Full-time | Salary + Equity

We’re building industrial AI for factories – deploying into some of the messiest, noisiest, most fascinating real-world environments you can imagine. We build our own hardware, write our own software and train our own models. Our systems watch over manufacturing processes and flags issues real-time - missing parts, out-of-specification dimensions and nearly imperceptible visual defects. We work across manufacturing sectors - aerospace, defence, automotive, food + beverage, electronics, textiles, polymers and all the rest!

We're currently hiring for:

- Frontend Engineers Vue + TypeScript

- Backend Engineers Python (FastAPI, SQLAlchemy), Postgres, Celery, Redis/RabbitMQ, Docker/Compose

- AI Scientists & Vision Researchers Anomaly Detection, PyTorch/ONNX, dataset tooling, detection/segmentation/measurement, robustness/lighting/domain shift, GPU workflows

Forward-Deployed & Hardware Engineers Camera/lighting rigs and calibration, hardware integration, networking (PoE), deployment and field ops.

How to apply:

Email hello@matta.ai with your application.

10x Partners | Senior Foundry/AIP Engineer | Full-Time / Part-time | REMOTE (US East Coast & EU) | Offices in Switzerland

We’re a boutique, high-impact consultancy focused on Palantir Foundry & AIP. Founded by ex-Palantir engineers and elite consultants, we deliver rapid, high-value solutions with real business impact.

Role

Lead end-to-end delivery on strategic client projects in Foundry/AIP Build production workflows from data integration to decision tools Partner with stakeholders (CxOs, product leads, data teams) to unlock value Lead engineering teams; help shape our delivery model and engineering culture

You bring

3+ years hands-on with Palantir Foundry and/or AIP Strong software fundamentals (Python, Spark, TypeScript) Deep understanding of data modeling, ontologies, operational workflows Ability to lead in complex client environments; consulting mindset Bonus: financial services experience; products/tools built on Foundry/AIP; prior Palantir or boutique consultancy experience

Why 10x

Elite team (ex-Palantir, top Foundry experts) High agency, low politics; real ownership from day one Premium compensation with upside as we scale Remote-first (US East Coast & EU) + optional on-site in Switzerland

Location

Remote: US East Coast (ET-friendly) & EU. Offices and team gatherings in Switzerland.

Apply

→ Apply here: https://10x-partners.com/about

CoPlane (https://coplane.com/) | Product/Design Engineer + Designer | Remote (North America) or NYC | Full Time

The world doesn't need another ERP. CoPlane is building the Agentic Orchestration platform that enables enterprises to orchestrate intelligent processes across their existing systems. Founded by ex-Stripe/Segment product and tech leads, we're changing how businesses operate their backoffice - helping them scale intelligence not headcount.

We're looking for exceptional engineers to grow our small founding team of engineers that include ex-founders, open source contributors (authors of neovim and neverthrow), and architects of petabyte-scale data platforms. You'll work with billion-dollar enterprises solving their hardest, most mission-critical automation problems.

If you're excited about working at the nexus of data, automation and AI, and want to make a significant impact in an early, well-capitalized startup with large enterprise design partners, we'd love to hear from you.

Roles: Product/Design Engineer and Designer.

For more info and to apply: https://coplane.com/careers

Brilliant.org | Software Engineers & Designers | Remote (North America), SF, NYC | Full-time | $170k — $235k | https://brilliant.org

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

We're hiring engineers and designers 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.

Our designers craft interaction patterns that make math, science, and computer science concepts feel approachable, delightful, and addictively learnable.

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.

Spacelift | Remote (Europe) | Full-time | Senior Software Engineer | $80k-$110k+ (can go higher)

We're a VC-funded startup (recently raised $51M Series C) building an infrastructure orchestrator and collaborative management platform for Infrastructure-as-Code – from OpenTofu, Terraform, Terragrunt, CloudFormation, Pulumi, Kubernetes, to Ansible.

On the backend we're using 100% Go with AWS primitives. We're looking for backend developers who like doing DevOps'y stuff sometimes (because in a way it's the spirit of our company), or have experience with the cloud native ecosystem. Ideally you'd have experience working with an IaC tool, i.e. Terraform, Pulumi, Ansible, CloudFormation, Kubernetes, or SaltStack.

Overall we have a deeply technical product, trying to build something customers love to use, and have a lot of happy and satisfied customers. We promise interesting work, the ability to open source parts of the project which don't give us a business advantage, as well as healthy working hours.

If that sounds like fun to you, please apply at https://careers.spacelift.io/jobs/3006934-software-engineer-...

You can find out more about the product we're building at https://spacelift.io and also see our engineering blog for a few technical blog posts of ours: https://spacelift.io/blog/engineering

Additionally, we're hiring for a new product we're building, Flows. Mostly the same requirements and tech stack, without the devops bits. You can apply for that here: https://careers.spacelift.io/jobs/6438380-product-software-e...

Cloudflare | Rust/DB engineers | SF/AUS/SEA/NYC/LON/LIS | Full-time | Hybrid

Hey HN, I'm hiring engineers for the new Cloudflare Data Platform (https://blog.cloudflare.com/cloudflare-data-platform). We do streaming ingest and processing, managed Iceberg catalogs, and a distributed query engine—all built on R2 and the Cloudflare Edge. We're making it ridiculously easy for Cloudflare customers to build data lakes.

I'm looking for Rust engineers with experience or interest in databases, stream processing engines, and query engines. You'll get to work on incredibly cool tech on a huge scale.

Note: we are hiring for hybrid in one of our engineering hubs (SF/AUS/SEA/NYC/LON/LIS).

If you're interested, shoot me an email (in profile) with subject HN and a brief description of your background.

sortie (https://sortie.co) | Remote (US) | Full Time

We are looking for a Founding Engineer to join us at sortie. As our first hire, you will join the 3 technical founders in building and supporting our core platform.

sortie is a pre-seed funded startup building point to point operations for the remote last mile. sortie builds the software that connects remote regions by air, land, and sea.

$125k+ salary & 1-2% equity

Backend focused: Python, Django, GraphQL, Postgres, GCP

For all the details and how to apply: https://gitlab.com/-/snippets/4901686

Synthropic | Detection Engineer + GenAI | Full-time / Part-time | Remote (SF) We're an early-stage startup looking for someone passionate about detection engineering and generative AI.

If you know SIEM, threat intel, logs, detection modeling/strategy, purple teaming, and adversary emulation — and you've been wanting to explore how LLMs/agents can accelerate detection engineering workflows — we'd love to talk.

The role A lot of it is what we call AI babysitting: guiding 1,000 kindergarteners (LLMs) as they try to become senior detection engineers. Sometimes they're brilliant, sometimes chaotic — your job is to shape that into something production-ready.

You'll be part detection engineer, part researcher, part builder, with a big say in shaping the product and how AI gets applied to real-world problems.

Details Full-time or part-time Remote-friendly (SF-based, local a plus but not required) Early team, high ownership, fast iteration

Email Resume: john at synthropic.com

The Nutrition Shortcut | UX/UI Designer | Full-time | Remote (Canada / ET core hours) Design end-to-end user flows for a lab-grade fitness and nutrition app with a clear roadmap. Work directly with the founder at a self-funded startup. Tools: Figma plus close collaboration across the product and the same platform stack. Comp: 90k-125k CAD salary, unlimited PTO, 100% employer-paid benefits after 90 days, performance bonus. Learn more and apply at: https://thenutritionshortcut.ca

Pex - part of Vobile | US | Full-time [1]

We serve everyone who uses the Internet to view, share, or create content - from the largest platforms and rightsholders, to independent creators. Pex automated content recognition technology identifies uses that other tools can’t detect, including modified audio with speed, pitch, tempo, language, and other distortions.

We are hiring for the Senior Site Reliability Engineer (on-site, Gainesville, FL) [2]

We offer:

    - Generous pay range based on skills and experience
    - Unlimited PTO + 10 paid holidays
    - Medical, dental, and vision insurance with FSA options, 401(k) plan
    - A supportive culture and excellent work-life balance

—

    [1] https://pex.com/
    [2] https://pex.com/senior-site-reliability-engineer-07-2025/

Monadical.com | Senior Full-Stack Engineer | Full-Time Montreal | REMOTE (Canada-Quebec)

Monadical is a fully remote software consultancy. We’ve built a diverse, friendly team that gets exposed to diverse industries and learning opportunities through our 3-12+ month projects across multiple sectors. Check our portfolio to see what we mean. We also maintain company principles that guide who we work with and how we maintain our culture. It’s a collaborative effort that any employee can edit through a pull request. We’re a relatively flat organization, fully-remote, and operate across many different toolsets and stacks depending on project needs. We’re a diverse team that shares similar values: self-direction, technical excellence, and curiosity. We do a lot of R&D, and move quickly. That often means doing whatever it takes to answer a question, and being quick to adapt to new information. Our iteration cycles are short.

We’re seeking:

- Senior Full-Stack developers strong at Python and/or JS, with experience in client relations, project management, a good understanding of machine learning systems—particularly LLMs—and strong UI/UX design and user research skills to help us build more thoughtful AI-powered products. Experience with ML model deployment and LLM application development is a plus.

See the full description and apply here: https://careers.monadical.com/

If you have any questions, drop us an email at apply at monadical dot com

Some perks of working with us include:

• Work from home (we’re fully remote!) • Flexible working hours • Six weeks of paid vacation • Competitive salary • Autonomy •Flat organizational structure. Your ideas matter, regardless of your title

Copilot Health | AI Platform Engineer, Front-End Engineer | REMOTE (SF preferred)

We’re building the operating system for medical AI agents—enabling at-home diagnostics with computer vision and voice AI to deliver continuous, equitable care in a broken system. Targeting asynchronous care, we serve hospitals, rural and specialty clinics with >85% diagnostic accuracy and >70% patient engagement.

Mission: fix healthcare access and equity.

Tech: PyTorch, 3D reconstruction, SAM, React, Swift/SwiftUI (iOS), Kotlin (Android), React/Next.js (web), GCP, FHIR, Temporal, MemGPT. HIPAA-compliant (SOC 2 in process)

Roles

- AI Platform Engineer: Scale vision-language models, voice AI (emotion/intent), 3D/hyperspectral pipelines, multi-agent systems, FHIR integrations.

- ML Engineer (Vision-Language): Fine-tune VLMs (e.g., Moondream) on Med-VQA/RAD for medical VQA, detection, captioning. Optimize for on-device, clinical-grade accuracy.

- Front-End Engineer: React UIs for patients/providers with voice and diagnostic visualization.

- Mobile Engineer: Develop native iOS (Swift/SwiftUI) apps for seamless voice (ElevenLabs), camera capture, intents and conversational workflows.

- Open Application for Unconventional Talent (tell us / show us)

Lean team (5), high ownership, remote-first. Open to contracting roles.

Apply: Email tmartin@copilothealth.com with “HN [Role]”, resume / github / research. We reply fast.

Baton | Senior/Staff Software Engineer - Infrastructure, Machine Learning / Product Designer Manager | San Francisco, CA (Hybrid) | Full-Time

Baton (baton.io) is Ryder's in-house product development group focused on harnessing emerging technologies to redefine transportation and logistics. With $10B in freight under management, our technology reaches every part of the U.S. economy.

We design and ship category-defining software that enables Ryder and its 50,000+ customers—including some of the world's most well-known brands—to plan and execute freight intelligently, efficiently, and cost-effectively. Our work includes everything from customer-facing software to the data platform that will power the next era of innovation at Ryder.

Baton's mission: enable supply chain on autopilot.

Ryder acquired Baton in 2022 to power its next wave of digital products. We operate at startup speed, with Fortune 500 reach. If you have a passion for solving complex problems and creating impact for the engine of the American economy, you'll love it here.

Current openings at Baton:

* Senior Software Engineer - Infrastructure, Machine Learning (Technical Lead): https://job-boards.greenhouse.io/baton/jobs/4870381007

* Staff Software Engineer - Infrastructure, Machine Learning: https://job-boards.greenhouse.io/baton/jobs/4965941007

* Product Design Manager: https://job-boards.greenhouse.io/baton/jobs/4796615007