Friendly Captcha | Data Engineer - Bot Protection | REMOTE within EU | PART-TIME or FULL-TIME | Office in Munich, Germany | https://friendlycaptcha.com

At Friendly Captcha we do one thing and we do it well: we protect websites from malicious actors and bots.

We provide privacy-friendly and accessible anti-bot solutions that don’t annoy users with tasks like clicking fire hydrants. We make the internet a bit better every day by winning over customers currently using Google reCAPTCHA.

We’re a growing, profitable, fully bootstrapped company. Our revenue mostly comes from medium to large European enterprise and governments.

We’re looking for an engineer whose focus will be on using data to improve our bot detection and protection. Telling apart bots from genuine users is vital to our product.

If possible, we prefer to keep things simple (perhaps boring is the right word even?) - choosing an if/else rule over a neural network. Good knowledge of the web is always useful in this company. At our scale we are looking for generalists more than specialists. The role is more about enabling for easy experimentation, data exploration and being creative in anti-bot approaches, than building the perfect ETL pipeline.

Our engineering team is fully remote across Europe, we meet up in person a few times per year. You can work either 4 or 5 days per week, fully remote or (partially) from our Munich office. Please note that we ONLY consider candidates located within the EU/UK/EEA/Switzerland.

Stack: Golang | Typescript | Clickhouse | Postgres | Redis | Python data science stack

Form with more information: https://friendlycaptcha.jobs.personio.com/job/2207852

ko-br | cofounders hunting and founding members across design, engineering, research and business development | https://ko-br.com | Onsite (SF, USA)

Looking for another technical cofounder, a commercial cofounder (work closely with Stacey, our advisor and ex-CCO of universal Robots) and founding members. If interested, let’s catchup over coffee in sf in sep.

P.S. we are closing our pre-seed round soon so don’t worry about our runway :)

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It’s a shame that we have unbelievably good hardware like collaborative robots (cobots) that could transform warehouses and yet they still struggle with basic tasks like unloading mixed pallets. Why? Because today's software can't handle real-world chaos.

That's where we come in. At ko-br, we're building the AI brains that make robots truly adaptable. Our physical AI models tackle messy, unstructured problems starting with depalletizing of mixed boxes in dynamic warehouses. Think real-time adaptation to shifting pallets, mixed SKUs, and unexpected failures.

We're a deep tech startup at the crossroads of AI, robotics, and human-machine interface. While warehouses are our first battlefield, our core mission is physical AI. So you need to be comfortable with the idea of pivoting to other sectors like education (ex: building robots for schools and universities).

Curious about our philosophy? Dive into our manifesto: https://ko-br.com/manifesto

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We're hiring generalists across design, engineering, research, and business development. If you thrive on agency: designing, building, and shipping products end-to-end, join us :).

We offer strong base salaries and we don’t shy from offering large equities, following PG advise: https://www.paulgraham.com/equity.html

Apply here: https://ko-br.com/careers

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About me: Ex-Amazon/Meta, 2x founder (agritech & gaming). Built ML models and infra for everything from satellite imagery to nanotech, powered Alexa's vision, and led ML for WhatsApp.

https://www.linkedin.com/in/ahmadbaracat

SmarterDx | 150-250k+ + equity + benefits | Remote (US only) | Multiple roles | https://smarterdx.com/careers

We build clinical AI that empowers hospitals to analyze the complete record of every patient to fully capture the value of care delivered. Founded by physicians in 2020, our proprietary AI platform understands the nuances of clinical reasoning, enabling hospitals to accurately reflect every patient visit for fair reimbursement. By doing so, hospitals can recover millions in earned revenue, enhance care outcome and quality metrics, and optimize healthcare operations.

The current team is very high functioning (MD + data scientist combos, former ASF board member, Google and Amazon engineers, Stanford LLM researchers, etc.) and initially scaled the company to $1MM+ in contracted revenue without raising capital.

SmarterDx recently became part of Smarter Technologies as part of a $1.1B deal by New Mountain Capital, a leading growth-oriented investment firm. We have been backed by top investors including Floodgate (Lyft, Twitch, Twitter), Transformation Capital, and Bessemer for a total of $71M, including our $50M Series B, and are experiencing an incredible growth trajectory customer and revenue wise with no signs of slowing down with 150% YoY headcount growth! This time last year, we were at ~90 employees, and are above 225 as of today!

We are looking for: Senior Platform Engineer - Staff and Senior SWEs, Full Stack and Backend focused - Staff ML Engineers - A Director of Engineering for our Product groups - Data Science Managers - Staff Data Scientists - Senior Data Analysts - More!

We have PMF, and it's time to scale! For more and to apply, see https://smarterdx.com/careers

Checkly | Multiple Roles | REMOTE (UTC +3 to UTC -3) | Full time | https://www.checklyhq.com/

Checkly helps engineers build reliable products by unifying testing, monitoring and observability. OpenTelemetry, Playwright, and Monitoring as Code are our foundation for unifying performance and reliability. In 2024, we raised $20M in Series B funding from Balderton, CRV, and Accel to take things to the next level.

-Senior/Staff UX Designer

-Senior Backend Engineer

-Staff Product Manager

-Senior Product Marketing Manager

See the full descriptions and apply here (and mention HN): https://jobs.ashbyhq.com/checkly?utm_source=hn

Klara Inc. | OpenZFS Developer | Full-time (Contractor) | Remote | https://klarasystems.com/careers/openzfs-developer/

Klara provides open source development services with a focus on ZFS, FreeBSD, and Arm. Our mission is to advance technology through community-driven development while maintaining the ethics and creativity of open source. We help customers standardize and accelerate platforms built on ZFS by combining internal expertise with active participation in the community.

We are excited to share that we are looking to expand our OpenZFS team with an additional full-time Developer.

Our ZFS developer team works directly on OpenZFS for customers and with upstream to add features, investigating performance issues, and resolve complex bugs. Recently our team has upstreamed Fast Dedup, critical fixes for ZFS native encryption, improvements to gang block allocation, and has even more out for review (the new AnyRAID feature).

The ideal candidate will have experience working with ZFS or other Open Source projects in the kernel.

If you are interested in joining our team please contact us at Email is hidden or apply through the form here: https://klarasystems.com/careers/openzfs-developer/

OpenRent | London, UK | Full-Time | ONSITE+PART REMOTE | https://www.openrent.co.uk

What sucked the last time you rented a house or flat? Come and fix it.

OpenRent is a force for good in an industry tarnished by rip-off agencies. Enabled by an unrelenting focus on technology, we now let more properties than any agency in the UK. In the last 12m we let over £50 billion worth of property, to over 7 million registered users, without ever charging any admin fees.

You'll be working on solving every aspect of the rental journey, from models to predict the right price of a property, to building the future of property management, all to help tenants find their dream home, and landlords their ideal tenant.

We're VC backed, profitable, and have plenty of ambition to maintain our fast growth in this absolutely massive market.

Roles currently available:

- Senior UX/UI Developer | Equity | 100k+ (based on experience) + quarterly bonus

All roles visible here: https://www.openrent.co.uk/jobs

Zeven | Senior Backend Developer | ONSITE in Zurich (Switzerland) | Full-time | Competitive salary + stock options

We're a newly-founded and well-funded startup that is seeking to revolutionize the sports industry with AI-powered solutions. Our mission is to unlock human potential and redefine the sports experience through innovation and technology.

We are looking for an experienced Senior Backend Developer and sports enthusiast to join our on-site team in Zurich, Switzerland. This is a hands-on, high impact role. We use Typescript for web, Python for ML, PostgreSQL, React + TanStack, AWS and SST.

Please see the Full Job Description [https://tinyurl.com/sw-zeven] for requirements and more details about our Tech Stack.

We are offering full-time employment with a competitive package:

• Competitive salary and stock options.

• Pension plan bonus and 25 days of paid vacation plus public holidays.

• Charming office next to the lake of Zurich with fully-equipped kitchen.

• Top-notch equipment (MacBook Pro laptops, standing desks, etc.).

• We love to organize company outings and sport events.

If you're a motivated and experienced backend engineer who is crazy about sports and looking for a new challenge, we'd love to hear from you! Please email CVs to Email is hidden

We do not consider remote candidates, agencies and candidates located outside the EU/UK/EEA/Switzerland

Proton | AI Engineer | Geneva, Paris, London, Barcelona, Prague, Taipei, EU Remote | Full time

We recently launched Lumo, a privacy-friendly ChatGPT alternative, by the makers of Proton Mail & Proton VPN.

We are looking for curious and talented people to help us grow Lumo with any of these skills: ML engineering, LLM inference, GPU infra & devops, Frontend (Typescript, React), Backend (Rust, PHP). Looking for senior-level or fast-growing juniors.

I'm one of Lumo's core devs, write to me directly at marc dot dupont, domain proton ch, with "HN" in the subject.

https://lumo.proton.me

Rover | Barcelona, Spain & Seattle, USA | Software Engineers (Multiple Roles) | Full-time

Rover is the world’s largest online marketplace for pet care. We connect millions of pet parents with trusted sitters and walkers, and we’re building a global platform that combines technology, community, and love for animals. With offices in Seattle, Barcelona, and beyond, we’re scaling an engineering culture focused on high-quality code, data-driven product decisions, and customer empathy. Open Roles: Lead/Senior Software Engineer, Acceleration (Barcelona)

Lead/Senior Software Engineer, Client Platform (Barcelona)

Lead/Senior Software Engineer, Sitter Experience (Barcelona)

Software Engineer II, Orders (Seattle)

Apply: https://www.rover.com/careers/engineering

Revere Defense Technologies - Autonomous Networks and Infrastructure

San Francisco (Dogpatch) | On-site w/ flexibility | Full-time | Multiple Roles, $120k–220k + equity + benefits

Why: Comms are contested. Radios make you a target, satellites aren’t guaranteed, and brittle legacy networks won’t survive future fights.

What: We’re building an autonomous maritime network — think distributed systems in the ocean—extending resilient comms, sensing and compute to the edge in high-threat remote environments.

Who we are looking for:

- Software Engineers: large-scale distributed systems, networking, system design, embedded software, DevOps rollouts. Python, C++, Rust. Bonus: SDR, mesh, security.

- Electrical Engineers: PCB layout, embedded, RF, circuits, power/batteries, electro-mechanical. Bonus: DSP.

- Marine/Mechanical Engineers: pressure vessels, subsea robotics, gliders, ruggedized design; DFM, reliability, field deployment.

You will: ship code to robots, test on the water, move fast, own big surface area, and work directly with military operators.

About Us: Our founding team includes a Navy SEAL veteran, defense industry engineers, builders, hackers, and watermen (sailors, boaters, divers, fishermen). We’re focused on real future missions — not legacy requirements. Venture-backed; public launch soon.

Eligibility for a TS/SCI security clearance is a plus. Please send a short note + resume/portfolio to Email is hidden with subject HN – Engineering.