US CAISI | 12+ technical roles | all seniority levels | onsite SF/DC | Full-Time | $190k | US citizenship required

We are a key center of AI expertise within the US government, and are hiring programmers, ML engineers & scientists, and more. I've found the past 13 months working here impactful and rewarding.

The Team: We have a unique concentration of talent in USG, including former frontier lab technical staff, folks from MIT/Berkeley/Harvard ML PhD programs, world-class cyber & bio experts, and a Y Combinator founder of multi-million dollar startups. Our staff has previously co-invented RLHF, discovered the reversal curse, and built Inspect and RStudio.

The work: Developing AI capability and security evaluations (e.g. cyber capabilities, agent hijacking, backdoor detection), red-teaming, and briefing leaders across government. Our mandate includes monitoring frontier AI for national security risks.

Apply here: https://www.nist.gov/caisi/careers-caisi (first posting closes Feb 17)

LiveKit | Remote | [Livekit.io](http://livekit.io/) | VoiceAI | webRTC | Real-time communications

LiveKit is defining a new paradigm for now applications are built by providing the framework and network infrastructure for voice, video, and physical AI.

Hiring:

>> Senior Software Engineer, Agent Platform: https://jobs.ashbyhq.com/livekit/f152aa9f-981c-4661-99d3-683...

>> Senior Software Engineer, Agents:https://jobs.ashbyhq.com/livekit/1757f49e-7e19-4c45-85f7-e46...

>> Senior SDK Engineer, Android:https://jobs.ashbyhq.com/livekit/62076f79-698c-426e-b4fa-8e1...

What we are looking for: Builders!!!!

>Passion for building something truly impactful

>>Remote company, first principles, global presence!

Co-founders:

Russ d'Sa, CEO and Cofounder: https://www.linkedin.com/in/russelldsa/

David Zhao, CTO and Cofounder:https://www.linkedin.com/in/davidzhao/

x2A | NYC, NY, USA | ONSITE | https://x2a.tech

We are actively looking for multiple software developers or software engineers to join our team (in the office, 5 days/week). These positions primarily focus on our 5off software product (puzzles/games).

There is zero expectation for you to be proficient in all aspects of the tech stack. We are looking for people who know some of these technologies and are excited to share their expertise while developing their skills and learning new things.

We welcome candidates at any experience level, with or without academic qualifications. For junior candidates, do not hesitate to share related personal projects.

Tech stack:

  - Languages: Python, Typescript, Swift, Rust, C++.
  - Backend: SQLAlchemy, PostgreSQL, Litestar.
  - Frontend: Svelte, Tailwind.
  - Mobile: Swift, SwiftUI.
  - Cloud: AWS, AWS CDK.
  - DevOps: Gitlab.

More https://x2a.tech/careers/openings/ for more details and how to apply.

EnsoData | Mobile Engineer (React Native/Typescript) | Full-time | Hybrid (Madison, WI) or Remote (US)

EnsoData strives to make healthcare more accurate, efficient, and affordable through waveform artificial intelligence (AI) technology. Using AI and machine learning, our software analyzes billions of data points collected from sensors placed throughout the human body.

We are seeking a mobile engineer who is passionate about making healthcare better and has experience building React Native Typescript apps.

Looking for 5+ years full time experience working with a team building React Native Typescript apps for iOS and Android.

Actively hiring - please apply at https://apply.workable.com/ensodata/j/8E07E794DF/ - we would love to hear from you!

Microsoft AI | Platform Engineering | Full-time | Seattle, WA or San Francisco Bay Area | ONSITE (4 days/week)

We're building the platform primitives that power https://copilot.com (Microsoft's ChatGPT). If you've shipped systems at scale—whether backend services, distributed infrastructure, ML platforms, or consumer AI products—we want to talk to you.

The work: design and build secure, performant platform services for AI at scale; collaborate with infrastructure, product, design, and research teams; ship high-quality code that reaches hundreds of millions of users; move fast in a design-driven environment.

You: solid fundamentals in systems thinking and software engineering; fluent in Python, C#, C++, Java, JavaScript, or similar; shipped real products or systems people use; can communicate across technical and non-technical teams.

Compensation: Competitive with other frontier AI companies, commensurate with experience

We're actively hiring and will respond to applicants. Check https://microsoft.ai/careers for current openings, or email maiplatformjobs@microsoft.com if something specific doesn't fit the bill. Apply directly if genuinely interested in building the future of AI.

Careful - I applied to this role and the founder (I assume) ghosted me mid-way.

control-f | Data Engineer (pyspark, databricks) | Full-Time | Remote (GER)

Wir bei control-f sind echte Daten-Nerds und bauen Big Data Plattformen für Telemetriedaten in der Industrie. Wir suchen jemanden, der Lust hat, mit uns gemeinsam aus Daten-Chaos smarte Lösungen zu machen. Wenn du Spaß daran hast, mit PySpark und Databricks richtig große Datenmengen zu bewegen und dabei technische Herausforderungen nicht scheust, dann bist du bei uns goldrichtig.

https://www.controlf.io/jobs-1/data-engineer-(m%2Fw%2Fd)

Onja | Full Stack Developer, Course Design & Back-End Developer, Course Design | Full-Time | ONSITE - Madagascar

Looking to join a social-impact driven company? Are you a software developer ready to use your skills for good? Onja trains underprivileged youth into world-class software developers. We are on the lookout for Course Designers who can help our students go from ‘what is coding’ to working in Global tech teams.

Help build a scalable course that will help train Madagascar’s brightest young people, while working alongside a team of talented, fun colleagues from all over Madagascar and the world.

Please apply through the following links: Full Stack Developer, Course Design: https://onja.org/careers/full-stack-developer-course-design

Back-End Developer, Course Design: https://onja.org/careers/back-end-developer-course-design

Pepr AI | pepr.ai | Onsite in San Francisco | Full-time | Multiple roles | $140-$270K based on role/experience | Visa Sponsorship | Relocation

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, Machine Learning & Optimization - https://pepr.ai/careers?ashby_jid=baf0e7ac-164f-4f1d-9938-de... - Member of Technical Staff, Product (ML) - https://pepr.ai/careers?ashby_jid=e6d130a7-29c0-420d-b954-ba...

Please write to us at founders@pepr.ai

Shaswat, co-founder & CEO

Rad AI | Infra / Platform / ML Infra / SWE | San Francisco, CA | ONSITE/HYBRID Preferred, Remote Available | Full-time

Rad AI builds AI products used by thousands of radiologists, helping reduce burnout and catch more disease across a large share of US medical imaging. We’ve raised $140M+ and are expanding our San Francisco presence with a new office at 2nd + Market, and we’re especially looking for infrastructure engineers who want to work in-person in SF.

Work areas: Infra / Platform: AWS, Kubernetes, Terraform, PostgreSQL, observability, secure/HIPAA production infra

ML infra / MLOps: Python, PyTorch, Airflow/LangGraph, data/feature pipelines, model serving

More about current roles and to apply: https://www.radai.com/careers?utm_source=W29wy29rlJ

Blue | 2x Founding Engineers + EA | Remote | Full-time | https://joinblueai.com/join-us

1x Backend/Infra Engineer + 1x Mobile/iOS Engineer + 1x SuperAdmin/EA

Now that we're closing a new big round, we're hiring. Small elite team or bust. Existing team includes: post-exit robotics founder + PhD AI/robotics + cracked fullstack webdev.

If you know anyone awesome, see our referral bounty at bottom. I'm all ears!

Blue is a complete operating system for your personal health and longevity. Integrate all your health data & records into one place. Share access with any doctor. When a doctor logs in, it morphs into a fullstack next-gen EHR. You, and only you, own and control all your data. We envision a WAY better healthcare system.

More details: https://joinblueai.com/join-us

Apply via email to roles@joinblueai.com (include resume/CV, LinkedIn/GitHub + quick blurb on 1–2 systems you’ve owned end-to-end that are most similar to Blue in some way) and mention this HN post.

Bounty: $500 for each referral that makes it to our final interview. If we hire them and they make it past 6mo, $5000 + dinner for the 3 of us @ a Michelin-starred restaurant + free lifetime access to Blue.

DoStuff | Retention Product Engineer (Full-Stack) | Austin or Remote (US time zones) | Contract to hire preferred

I’m Scott - founder of DoStuff. We have a pretty big, and growing, membership product called DoMORE - $7/month for a pair of tickets to an event we think you’ll like. We’re hiring a hands-on Retention Product Engineer to own engagement → churn reduction end-to-end.

You will analyze cohorts, define the retention north-star metric, ship product and lifecycle experiments yourself, and measure impact.

This is not a PM-only role and not a pure engineering role. You own the full loop: insight → build → measure → iterate.

Our stack: React (FE), Ruby on Rails + Elixir (BE), Postgres, Elasticsearch. Proprietary lifecycle tooling for email, SMS, and in-app (web). No feature-flagging or experimentation framework yet - you’ll help install the remaining plumbing.

Retention is the highest-impact opportunity in the business and this role has real authority to ship.

If you have experience with the above and this sounds like fun, reach out to scott+domore@dostuffmedia.com with something in the subject line that let’s me know you’re real and interested. THX

Aptira | Fully Remote US/CA/UK/EU/AUS/NZ | Full-time | SRE

We're an Australian consulting company currently building out a multi region baremetal Kubernetes cluster for a client experiencing explosive growth and looking for SREs to help keep it running.

At the base: Kata Containers, Kyverno, Cilium, TopoLVM and Ceph

Workloads: Python microservices, Kafka, Postgres, Valkey and MongoDB

Observability using Grafana LGTM and automated using Ansible, Helm and BitBucket.

If you're a Linux nerd with a few years of experience under your belt and you're looking to dive deep into platform engineering, get in touch with us via careers <at> aptira <dot> com

Zefr | Los Angeles, CA (Marina del Rey) | Staff or Principal Site Reliability Engineer | Full-time | On-site 2-3x per week | Staff: $190,000 - $210,000, Principal $210,000 - $235,000

Company

Zefr is the leading global technology company enabling responsible marketing in walled garden social environments. Zefr’s solutions empower brands to manage their content adjacency on scaled platforms such as YouTube, Meta, TikTok, and Snap. Through its patented AI technology, Zefr offers brands and agencies more accurate and transparent solutions for social walled gardens.

Role

Staff or Principal Site Reliability Engineer

You

As a Site Reliability Engineer at Zefr, you’ll apply your expertise in cloud infrastructure, CI/CD, Observability, and core SRE concepts, to deliver high-quality, reliable, and scalable solutions.

We’re looking for someone to combine their technical expertise with strong leadership and a passion for continuous improvement and innovation. Zefr wants a candidate that champions reliability as a product feature, and can translate complex technical concepts into strategy. This is a role where you'll shape how we build and operate systems at scale.

Tech Stack

Clouds - GCP, AWS

Kubernetes - GKE, EKS

GitOps - ArgoCD, Github Actions

Languages - Python/React/Node.js

Observability - Prometheus, Grafana, Open Telemetry, Chronosphere

Staff: <https://zefr.com/about-us/careers?ashby_jid=bcfa5b44-6623-4e...>

Principal: <https://zefr.com/about-us/careers?ashby_jid=54ecc7d8-6c8b-46...>

PDM Automotive | Product Manager | US Fully Remote | Full-Time - $125-135K

Ideally looking for someone with UX design background who has moved or would like to move into product. We're well positioned to dramatically change how the automotive aftermarket operates.

https://jobs.gusto.com/postings/pdm-automotive-product-manag...

Virio.ai | SF | Full Time

We're AI marketer that writes LinkedIn content for every employee at your company. Grew over $1 million ARR in 30 days.

Hiring (250k-500k TC):

Product Engineer - Strong product sense, ships fast, designer

Senior SWE - infra, ETL pipelines

Founding Engineer - Ships fast, building many agents.

Email: andrew[at]virio[dot]ai - a role, a short summary of why you are a good fit.

Quest | SF | Onsite

New Consumer AI company, raised $6m pre-seed. Looking for founding engineers. $200k+, significant equity. Reach out to founders@newquest.ai

Freetrade | London, Budapest (ONSITE) | Full-time | https://freetrade.io | £75k-£140k

Freetrade is a commission-free investing app used by over 1 million people in the UK. Our team is expanding, and we’re seeking software engineers to evolve and scale our core investing platform.

In this role, you will be instrumental in building and maintaining reliable and trustworthy systems for trade execution, clearing and settlement, asset servicing, and internal operational tools.

You will also play a key role in shaping our technical direction and mentoring other engineers as our team grows.

Tech we use: TypeScript, Node.js, Postgres, and GCP

Note: We are three days in the office We don’t sponsor visas at the moment.

We are hiring across the board in engineering, data, people, marketing, risk & compliance and finance.

See all of our opportunities here: https://freetrade.io/careers

Squint | Onsite, San Francisco + remote for some roles | Squint is the leading manufacturing intelligence platform. We're leveraging the latest in AI, spatial, and hardware capabilities to accelerate human potential and spark the next industrial revolution.

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 (Mid-level to Staff+)

- Software Engineer, Backend

- Product Manager

- Senior Accounting Manager

- Director of Enterprise Sales, Energy Sector

- Strategic Enterprise Account Executive

- Senior Sales Engineer

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

Shinzo (https://shinzo.network)| USA/Canada + REMOTE | Multiple Full-Time Roles

We're building the read layer for blockchains. The irony of "trustless" applications depending on centralized indexers like Alchemy or The Graph isn't lost on us—we're fixing it.

Shinzo embeds indexing directly into validators, turning blockchain data into a cryptographically verifiable public good. No trusted intermediaries, no API keys, no "please don't rate limit me" prayers at 2am.

Stack: Go, Rust, WebAssembly, Merkle CRDTs, recursive SNARKs, LibP2P, GraphQL, Cosmos SDK/EVM

Hiring:

-DX Engineer - Indexer Migration - https://bit.ly/3YBwhBn

-Senior Blockchain Indexer Engineer - https://bit.ly/4sHQkLY

-Senior Cross-Chain Smart Contract Engineer - https://bit.ly/49BzJAN

-Protocol Engineer - Blockchain - https://bit.ly/4sDRica

We're pre-mainnet with real technical differentiation—not another "decentralized" project that's actually three EC2 instances in a trench coat. If you've ever been mass-migrated off a deprecated API endpoint or debugged why your subgraph stopped syncing, you understand the problem we're solving. We care more about what you can build than where you went to school.