Intuition Machines, Inc. | Multiple Roles | REMOTE - WORLDWIDE

Want to build ML models that impact hundreds of millions of users daily, running on systems that handle millions of requests per second? Excited by the challenge of deploying models under strict memory and compute constraints - all while adapting to continuous adversarial drifts?

Intuition Machines, the team behind hCaptcha, is hiring an experienced ML Applied Scientist (5+ years) to design and scale models, mentor engineers, and translate business needs into technical solutions. You’ll work in a low-overhead environment with small, distributed teams that prioritize rapid iteration and shipping early.

If you have strong experience in real-time ML, online learning, and the full modeling lifecycle, come help us build the security infrastructure that keeps the internet safe.

Details: https://apply.workable.com/imachines/j/912cc62559/

We're also hiring for:

Lead ML Engineer - https://apply.workable.com/imachines/j/3b70672c1a/

Senior Data Engineer - https://apply.workable.com/imachines/j/d31d65bf69/

SREs – https://apply.workable.com/imachines/j/cd0057c4cc/

Senior Backend Engineers – https://apply.workable.com/imachines/j/2de5642c7e/

Senior Frontend Engineers – https://apply.workable.com/imachines/j/2eecc9d13d/

See all open roles: https://apply.workable.com/imachines/

Join us and build something impactful!

Castle (https://castle.io) | Senior ML Engineer | Senior R&D Detection Engineer | REMOTE (Europe/EMEA) | Full-time

Hi HN! I’m Antoine, Head of Research at Castle. We’re a YC-backed Series A startup helping companies like Canva, Atlassian, and Rockstar Games fight fraud and abuse. We're building modern, AI-powered bot detection and abuse prevention tech, with a focus on real-time protection and behavioral intelligence. We’re a small, fast-moving team looking to add two technical roles:

Senior ML Engineer – Fraud & Bot Detection You'll work on real-time ML pipelines, anomaly detection, and adversarial ML techniques to stop bots and malicious actors. We’re combining traditional fraud signals with modern AI—LLMs, behavioral clustering, and vector-based search—to stay ahead of attackers. You’ll own models end to end and deploy quickly, with direct access to rich, structured behavioral and fingerprinting data. Ideal for someone with strong experience in the anti-fraud/anti-bot field who loves cutting-edge ML and wants immediate impact.

Senior Detection Engine Engineer (R&D) You’ll build and scale the core infrastructure behind our detection logic—rule engines, fingerprinting pipelines, and high-speed signal ingestion. We’re integrating AI-driven detection and auto-adaptive logic that reacts in real time. If you enjoy real-time systems, security, and automation, this is a highly technical role that’s at the core of our detection stack. Perfect if you’ve worked in security, data pipelines, or real-time analytics and want to outsmart fraudsters.

We pay US salaries globally | Fully remote from Europe/EMEA timezone | Flexible hours | Unlimited PTO | Paid parental leave We're actively hiring and committed to responding to every qualified applicant.

Drop us a line: Email is hidden

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V7 Labs - https://www.v7labs.com/careers We're actively hiring for our London HQ (hybrid roles), remotely across Europe and building our New York office as well.

What we do: V7 Go: Automate workflows with AI agents. V7 Darwin: Label data at scale to build custom AI

We're looking for FS, FE and BE Engineers, AI Solution Engineers and AI Product Engineers as a priority. Also various GTM roles live!

Please apply via our website and mention HN during your application!

Don't bother applying to this one, as it's a ghost job posting (you can check for yourself in previous Who is Hiring posts dating all the way back to 2023)

Do you dream of electric NAND and NOR gates?

Do you calculate your chances of faster service at a checkout counter based on scheduling algorithms?

Do you entertain your friends and family with debates regarding Linux vs. BSD vs Windows until they beg for mercy?

If so, you might enjoy working here, and I encourage you to apply!

DM me for more details. Or call me at 555-1212

https://broadcom.wd1.myworkdayjobs.com/en-us/external_career...

Reef Technologies | Senior Python Backend Engineer | REMOTE | Full-time Salary: 45-70 USD per hour. As a full time staff member, we expect a commitment of 30 hours every week, but assuming 40 hours per week, you earn 7560-11760 USD a month. Hourly rates auto-adjusted for inflation.

We're all about the backend! As a fully remote Python software house, we comprise a small, agile team of senior engineers, each with at least five years of experience. We're known for delivering stable solutions and always accounting for edge cases, minimizing the need for urgent fixes.

- Full Remote Flexibility: Work from anywhere.

- Flexible Hours: Pick your own hours.

- Dynamic Projects: Work with startups globally on projects of your choice.

- Influence: Contribute to decisions and influence how we operate thanks to the Sociocracy 3.0 framework.

- Personal assistant for your non-work tasks.

- Multicultural environment with a voice for everyone.

Who Are We Looking For? Experienced Python engineer with at least 5 years of programming (not necessarily professional), including at least a year with Python. Must have a deep love for Python and the ability to come up with Pythonic solutions to problems.

How to Apply: We don't care about CVs. Just go to https://careers.reef.pl/?utm_source=hackernews and see what we're all about!

Contact: Email: Email is hidden Company Website: https://reef-technologies.com/

They take forever to reply (2 months since my first email, meanwhile they regularly kept posting the job on HN) and after the initial call had me take a home assignment that I spent almost an entire day on, then went total radio silence again - not even a generic "sorry for the delay" or a rejection email. I see I'm not an outlier, given others' comments under their postings. I don't think the job's fake - they just really don't care about their candidates' time.

Langfuse (https://langfuse.com) | Backend Engineer, Product Engineer, Design Engineer | Berlin Germany | in-person | Full-time I'm Max, co-founder and CTO of Langfuse (YC W23) - we're building open source LLMOps dev tooling (Github: https://github.com/langfuse/langfuse/). We started with observability and have branched out into more workflows over time (evals, prompt mgmt, playground, testing...). We have a bunch of traction and are looking for our fourth to sixth hire in scaling and building feature depth. We're hiring in person (4-5 days/week) in Berlin, Germany (salary ranges for each job 70k-130k, up to 0.35% equity).

We value quality in engineering at Langfuse: We try to find elegant solutions to complex engineering challenges, and we invested significant effort in enhancing our production setup (infra as code, top observability setup and more).

If you'd love shipping in open source, writing about what you work on and working hard with super interesting and sophisticated customers (devs) - reach out!

More info: https://langfuse.com/careers

luce.sg | Ruby on Rails Tech Lead | Onsite | Jakarta, Manila | Full-time

Luce is a tech-enabled services platform based in Singapore. We are looking for a Tech Lead to join us in our Indonesian (Jakarta, Batam) or the Philippines (Manila) office.

Looking for a Rails engineer with 5+ years of experience, track record of influencing technical direction and examples of helping people around grow (internally or externally via conferences, writing).

I'm HM, more info here (will soon be posted on our website too): https://makarst.notion.site/luce-tech-lead-ruby-on-rails-1ca...

Apply by emailing your resume to Email is hidden and include a short note about your proudest career moment so far.