Myndstream | Hybrid London, UK | Full time | https://myndstream.com

Music for health and wellbeing - we're working with leading scientists at MIT, NYU and UPenn alongside a roster of composers to create validated music to improve health and wellbeing.

We are on course to enhance the effectiveness & efficacy of our music through the use of ML. We've started with hospitality as a launchpad and are now moving into healthcare markets.

Core Stack: TypeScript, Rust (for low-level audio work), React, PostgreSQL, WebSockets, GCP

If you are enjoy ownership, autonomy, design patterns and are a pragmatic generalist then you will enjoy it here.

Hiring Founding Software Engineers in London, UK, - contact me via email: will [at] myndstream.com

Jane Street | Hybrid | Full-time

If you haven't heard of us before, we’re a quantitative trading firm that cares a lot about technology. This means building elegant solutions that scale well, never assuming that “best in market” is the same as “best possible,” and ensuring everybody has the resources needed to do their jobs well.

We're looking for folks in New York, London, Hong Kong, and Singapore for a variety of roles including, but not limited to:

- Data Engineers who can help us understand, clean, manage and share the data that guides our trading. At Jane Street, having a thorough and accurate understanding of data is at the core of everything we do -- https://www.janestreet.com/join-jane-street/position/6558007...

- Machine Learning Engineers with robust experience in machine learning and strong mathematical foundations. Machine learning is a critical pillar of Jane Street's global business. Our ever-evolving trading environment serves as a unique, rapid-feedback platform for ML experimentation, allowing us to incorporate new ideas with relatively little friction -- https://www.janestreet.com/join-jane-street/position/6485460...

- A Machine Learning Educator who will be instrumental in maintaining and growing our ML educational programs and classes, spanning topics such as an introduction to general ML, efficient use of AI assistants, our internal stack for training models, and how to reason about performance -- https://www.janestreet.com/join-jane-street/position/8056588...

- Software Engineers who are intimately tied into every area of our business. We are big believers in functional programming, using OCaml, a statically-typed functional programming language, as our primary development language. We also believe in the value of open source software, using it in our daily work and releasing hundreds of thousands of lines of our own code as open source -- https://www.janestreet.com/join-jane-street/position/4274288...

- Frontend Software Engineers who are passionate about user-interface design and typed functional programming. You would take part in the design and implementation of our next-generation of browser-based tools for operating our trading infrastructure -- https://www.janestreet.com/join-jane-street/position/6184529...

- A Programmer-Who-Writes, or a Writer-Who-Codes -- https://www.janestreet.com/join-jane-street/position/7604415...

Yuma.ai (YC W23) | Senior Full-Stack AI Engineer | Remote (Europe) or Hybrid (Barcelona) | Full-time Ruby + AI Agents = Yuma

Yuma is building a complete orchestration platform that deploys autonomous AI agents dedicated to customer support in e-commerce. We are one of the leaders in this space and we offer one of the most advanced platforms to date, supporting over 100 paying customers. Our agents replicate human capabilities by taking actions and retrieving information from external services as needed.

Our top merchants automate over 80% of their support tickets through Yuma.

Yuma was founded by Guillaume Luccisano, a 3rd time YC founder, and now boasts a team of 18 highly dedicated, talented people driven to deliver the best value to our customers through AI.

Learn more & apply here: https://yuma.ai/work-at-yuma

Elicit | San Francisco + remote (US timezones) | https://elicit.com/careers

Elicit is an AI research assistant that uses language models to help researchers figure out what’s true and make better decisions. We scaled to >$6MM annual revenue and 450k MAU fast. We're hiring for multiple roles and are primarily interested in people with early-stage company experience, who are comfortable in high-agency, fast-paced teams.

Reasons you might want to join Elicit:

1. We have been thinking about how to apply AI for high-stakes knowledge work since even before GPT-1. Elicit was spun-out from Ought (https://ought.org/) which was an applied research lab.

2. If you're concerned about the potential downsides and risks of super-powerful AI: so are we! Happy to explain more of this story on a call, or you can also check e.g. https://ought.org/updates/2022-04-06-process for a primer.

3. We like spending time with each other, and have get-togethers every 6 weeks, but we're flexible on location.

Reasons you might not want to join Elicit:

1. We've found a level of product market fit (as evidenced by metrics) but we've not proven everything out yet. If you want predictability, Elicit is not for you.

2. We aim to hire people who thrive in low-bureaucracy environments, and let them loose. If you need structure, lots of support, close mentorship, or tightly-defined work assignments, Elicit is not for you.

A selection of open roles—more on the site:

• Machine learning engineer: https://elicit.com/careers?ashby_jid=913a03d5-bd26-4c64-8346...

• Our first data engineer: https://elicit.com/careers?ashby_jid=4617f630-f971-4716-b753...

• Front-end engineer: https://elicit.com/careers?ashby_jid=b5e218b8-8730-4254-b026...

Archera | Senior Data Engineer | REMOTE (US/Canada) or Hybrid (Seattle) | Full-time

Archera empowers organizations of all sizes to optimize their cloud costs through unique, short-term, insured GRI (Guaranteed Reserved Instance) and GSP (Guaranteed Savings Plan) commitments.

We’re looking for a Senior Data Engineer to build and scale the data backbone of Archera’s cloud cost optimization products. This role focuses on architecting large-scale data pipelines that process cloud billing and usage data across AWS, Azure, and GCP. You’ll work across OLTP and OLAP systems to ensure our data infrastructure is performant, reliable, and purpose-built for FinOps. Your work will enable accurate cost modeling, insights, and automation that directly power Archera’s cloud rate insurance platform.

Stack: Python (SQLAlchemy, Flask), TypeScript (React), PostgreSQL, Snowflake, Argo Workflows, k8s, AWS/GCP/Azure

Benefits: RRSP/401k match, healthcare, stock, wework/home office expenses.

Apply: https://job-boards.greenhouse.io/archera/jobs/4788177008 and email me at simon+hn <at> archera <dot> ai

Datadog | Software Engineers | ONSITE (Boston, Lisbon, Madrid, NYC, Paris, Tel Aviv) | Full-time

Datadog is a monitoring, tracing, logs system, and more, for your infrastructure and services. We build our own tsdb, event store [1][2], distributed tracing tools, cutting edge visualizations, and more. We love shipping great experiences for customers just like us and are growing fast! We write a lot of Go, Java, Python, Typescript (with React), and a bit of other languages. We run on k8s, and are multi-region and multi-cloud.

We're looking for people who can build systems at scale as we process trillions of events per day. Let us know if that's you!

https://dtdg.co/hnwhoshiring

[1] https://www.datadoghq.com/blog/engineering/introducing-husky

[2] https://www.datadoghq.com/blog/engineering/husky-deep-dive

360Me | Founding CTO & iOS Engineer | London / UK | Full-time | AI, Precision Health, Aging

We're building 360Me: an AI-driven platform that helps people measure and reverse their biological age using diagnostics, wearables, and real-time insights. Backed by clinical validation and a world-class product team, we're turning fragmented health data into personalized, impactful action.

We’re hiring a Founding CTO to lead and scale our technical foundations — and an experienced iOS Engineer to help deliver a seamless mobile experience from day one.

Founding CTO (AI, Infra, Health) You’ll architect, build, and scale the entire tech stack from 0→1, then grow the team around what works. You’ll ship our food analysis API (image/audio/text → nutrient vector), build real-time infra with GCP/Vertex AI/Terraform, and lead engineering through our first clinical pilot. You’ll own core technical decisions, contribute code, and eventually hire and mentor a high-performing team.

You Likely Have: 10+ yrs engineering experience, 5+ in AI/ML or data-intensive systems • Proven 0→1 track record (healthtech, biotech, or regulated SaaS ideal) • Comfortable writing production code and scaling systems • PhD/DPhil or deep experience in CS, AI, Physics, or Computational Bio (bonus)

$160k–$200k + equity

Apply: 360me.typeform.com/CTOApp

Note: Our process includes two technical case studies, designed to simulate real decisions you’ll face here.

iOS Engineer (SwiftUI, HealthKit, Wearables) 7+ yrs iOS experience, including 2+ with SwiftUI • Shipped 2+ production iOS apps • Integrated HealthKit and wearables (e.g. Oura, Withings) in production • Experience with Realm, RevenueCat, AWS • CI/CD fluency with GitHub Actions, Xcode Cloud, Fastlane

Bonus: WatchOS apps, familiarity with modern AI dev tools, HIPAA/GDPR knowledge • UK-based (London hybrid ideal)

$90k–$115k + stock options

Apply: 360me.typeform.com/fullstackdev

HomeCloud | Senior Cloud Engineer (AWS / Node.js / TypeScript) | Remote (US, EU UTC-6 to UTC+2) | Full-Time (Contractor)

HomeCloud is a fast-growing proptech startup rethinking home inspections, onboarding, and management using cloud-native systems and AI. We just raised a $3.5M seed round from top VCs and are building intelligent infrastructure for the future of homeownership.

We’re looking for a Senior Cloud Engineer to help us build scalable backend systems on AWS using Lambda, Step Functions, DynamoDB, EventBridge, and more. You’ll work with a modern serverless stack, integrate AI services (e.g. OpenAI, Bedrock), and help define our engineering culture alongside the CTO and founding team.

You might be a fit if you: • Have 5+ years of experience building serverless systems on AWS • Are fluent in Node.js + TypeScript • Have worked with serverless architecture and event-driven systems • Are curious about AI/LLM APIs and how to integrate them into real-world workflows • Value ownership, pragmatism, and building useful products quickly

This is a high-impact, remote-first role on a small, focused team building the foundation of a data-rich, AI-powered platform.

Remote (UTC-6 to UTC+2) Early-stage, fast-moving environment Apply: https://app.dover.com/apply/HomeCloud/24919848-66d7-48c0-bf5... Learn more: https://gethomecloud.com/about-us

Lumafield | https://www.lumafield.com SAN FRANCISCO, CA or CAMBRIDGE, MA – ONSITE

About Lumafield: Lumafield was founded in 2019 to upgrade manufacturing by making the most advanced tools more accessible. Our AI-driven platform and industrial CT scanning technology give engineers unprecedented visibility into their products, helping them make better decisions, faster. We’re headquartered in Cambridge, MA, with an office in San Francisco, CA. Lumafield is building the future of manufacturing through deeper insights, greater autonomy, and continuous innovation.

We recently raised our Series C funding of $75 million, further accelerating our mission to revolutionize manufacturing.

Open Roles: Backend Software Engineer (SF Bay Area) | Research Engineer (Greater Boston Area) | DevOps Engineer (SF Bay Area) | IT Specialist (SF Bay Area) | UX Designer (SF Bay Area)

Don't see a role you're looking for? Visit our careers page (https://www.lumafield.com/careers) and send us a message!

Channable | Utrecht, Netherlands | HYBRID

Channable is a fast-growing B2B SaaS platform that offers a fully integrated way to market your products online. We empower marketers and online businesses to manage, scale, and optimize their marketing.

Do you want to read more about our engineering culture? Then have a look at our popular tech blog: https://tech.channable.com

Additionally, you can also take a look at some of our open-source work at https://github.com/channable to get a feeling of how we work together and what our code looks like.

Our stack includes: Python, Haskell, Rust, PostgreSQL, Redis, Nix, Terraform, Nomad, Ansible

We're looking for a Python Software Engineer to join us: https://jobs.channable.com/o/python-software-engineer-insigh...

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

Artificial Analysis is an independent AI benchmarking and insights provider. Our benchmarks help engineers and companies understand AI and make informed decisions on AI technologies.

We are hiring for two 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.

Apply at hiring (-at-) artificialanalysis.ai with your resume, github and dot points on relevant experience.

OneCrew | Multiple Roles | ONSITE / HYBRID | San Francisco, CA

OneCrew is the leading unified platform helping paving contractors estimate accurately, manage crews effectively, and track profitability in real-time. We eliminate the costly mistakes and wasted time that come from juggling multiple disconnected systems—giving contractors a single source of truth to run their entire operation.

We recently closed our Series A and are looking for highly motivated individuals to own their domain and accelerate our growth.

  - Engineering Manager
  - 3x Software Engineers (Fullstack, Frontend, Backend)
  - Product Manager
  - Growth
  - Director of Sales (REMOTE US OK)

Find job details here: https://jobs.ashbyhq.com/onecrew and apply via email: hn [at] getonecrew [dot] com

New Lantern | https://newlantern.ai | Software engineers (infrastructure engineers & backend-leaning product engineers) | Full time in San Francisco, CA (ONSITE)

New Lantern is hiring software engineers to help build an AI copilot [1] for radiologists.

Radiologists are experts at diagnosing disease in medical images, but they spend the majority of their working hours on tasks that have nothing to do with diagnosis: reading prior reports, transcribing handwritten notes, taking manual measurements, dictating reports, and chasing down follow-ups. New Lantern is building an AI copilot for radiologists to automate this non-diagnostic work, so radiologists can focus on the diagnostic & patient care work they love the most.

We are starting to find product-market fit and recently raised a $19M Series A from Benchmark [2]. Demand for our product is growing, and we're hiring software engineers in San Francisco to help us scale our product and our team. We work together in person five days a week from our office in Jackson Square.

Engineering is at the heart of New Lantern. Our engineers work directly with our founder/CEO, our staff radiologist, and our end users to build features that radiologists rely on daily. Everyone has real ownership and autonomy, moves quickly, and ships meaningful work frequently. We're a small, sharp team of frontend, full-stack, and backend engineers building a React-based web app backed by Python services, cloud infrastructure, and LLMs.

We're hiring for several engineering roles but top of mind right now is a Senior+ (ideally Staff-level) Infrastructure Engineer. We're looking for someone who's excited to help our team go from 0.25->1 on observability, availability/reliability, and scalable & easily deployed infrastructure to help us grow to meet customer demand. Once we level up our infrastructure, this team member will be instrumental in helping us build towards very high availability and reliability systems that enable high product development velocity.

I'm Steve, New Lantern's Head of Engineering. If you're interested or want to learn more, shoot me a note at (my HN username)@newlantern.ai.

[1] We translate "AI copilot" to "AI radiology resident" when we speak with medical professionals, but the former is the clearest way to communicate what we're building here.

[2] https://newlantern.ai/blog/new-lantern-19m-series-a-led-by-b...

PostMatch.io | Growth Hacker/Marketing/Sales | Remote (USA/Canada) | Contract to Fulltime | Equity

I’m building a SaaS product with PMF already solved and a clear roadmap. Competitor traction shows there’s plenty of room in the space, and I’m looking for marketers and growth hackers to help secure customers and drive growth.

Product is almost ready, probably 3-7 days.

You’d be a great fit if you:

Know how to acquire early customers in B2B SaaS

Thrive on creative, low-cost growth tactics (organic + paid)

Enjoy working lean and iterating quickly

We’ll need to operate lean in the beginning, but once revenue starts flowing, there will be budget for paid channels and ads to help scale further.

I’m open to trialing potential partners on a commission basis, and if we’re a good fit and see results, I’m ready to discuss a strategic equity partnership.

Let’s connect if you’re excited to help take a SaaS business from early traction to serious growth.

Contact: launch@postmatch.io

Eclypsium | Portland (US), Córdoba (ARGENTINA), Singapore (remote) | ONSITE / HYBRID / REMOTE | Full-time & Contract

https://eclypsium.com/company/careers/

We protect devices from chip to cloud—securing firmware, hardware, and the supply chain beneath the OS. Fortune 100s and federal agencies run us in production.

- Senior Software Engineer – Portland, OR

- Platform Architect – Córdoba, AR

- Sr. Software Engineer (Data) – Córdoba, AR

- Junior Data Engineer – Córdoba, AR (new)

- R&D Consulting Engineer – Singapore (remote OK)

Why Eclypsium: - Startup speed, no politics, real impact - Equity, full health, flex PTO, parental leave

I’m Rob (rob.banagale@eclypsium.com). Eclypsium found me via HN. If a role fits, please apply at the link, and feel free to reach out with questions.

Gentrace | TypeScript + React | Hybrid (Williamsburg, Brooklyn & San Francisco)

Gentrace helps the most impactful companies in the world like Quizlet systematically test and evaluate their AI applications. We recently raised an $8M Series A from Matrix Partners.

Ideal candidate profile: - We use TypeScript and React heavily. Although not required, we prefer candidates with strong experience with modern web technologies. - 4+ years experience working in a full stack capacity. Role info: https://gentrace.ai/eng Email: jobs@gentrace.ai

CredCore | Engineering | Full-time | US/India | www.credcore.com

CredCore helps companies analyze Credit Agreements using AI. We are looking to hire an Engineering Lead with 10+ years of experience. You should be familiar with design patterns and software architecture, infra/kubernetes, and TypeScript/Python. If you’re interested, please reach out to me at jeswin@credcore.com.

A cover letter is not necessary. But please share your resume and links to your GitHub/GitLab/StackOverflow/other profile, or blog/papers, or other portfolio we can review before setting up the interviews.

Chirp Family Travel | San Francisco Bay Area

- iOS Developer (Swift)

With Chirp, we are solving a family-centric urban navigation problem. We are a small team of parents and have built the first version of the iOS app. We are looking for a collaborative team member with experience in Swift for backend and frontend.

If this sounds interesting, reach out to us via email: chirptravel@gmail.com.

Company: www.linkedin.com/company/chirptravel

VersaFeed.com | SENIOR SOFTWARE ENGINEER (Python/Django) | REMOTE (USA/EU) | Full-time

About us: Fancy ETL pipeline which processes products from huge ecommerce companies. Data extraction and massage, delivery to destinations like Google/Meta/TikTok/etc. Profitable, 15+ yrs stable, 100% employee-owned. No VC, no pointless meetings, just serious coding.

Stack: Python/Django, JavaScript, VueJS, PostgreSQL, Snowflake, Docker, Git, AWS, AI/LLM integrations (OpenAI & Gemini).

Compensation: $150K–$250K USD/year DOE.

You: Senior dev who's seen (and fixed) enough dumpster-fire code to last a lifetime. Python/Django deeply internalized; ideally Vue (or React) skills as well. Git/Docker/REST are second nature. You’re the coder other devs come to when their stuff breaks: an architect-level thinker who’s rewritten ‘clever’ code into something that actually works. You play well with others and write code that’s easy to live with. Bonus: AI integrations, Py2→Py3 migrations, Snowflake (or Databricks) experience.

Timezones: Primary time zone is PST (some standups at 9AM PST). Otherwise async-friendly.

Benefits: 401K match (USA), healthcare, equity, fully remote. Stable company with no time-wasters.

Apply: email jobs+hn252 [the-at-mark-thing] versafeed [the-period-thing] com

Rappo | https://buildrappo.com | Founding Fullstack Engineers | Remote (Preferably India)

Hi, I am the founder of Rappo (a network for GTM). We observed that technical startups spend way too much time in the early stages figuring out GTM.

Everyone is like PMF is crucial, but there is little support/help around in getting there.

Learn more about the role: https://wellfound.com/jobs/3133503-lead-founding-full-stack-...

PS: I am a solo founder, and we allocated generous equity for advisors and early hires.