Upway | Paris (Hybrid) | CTO & Software & Data Engineers | Full-time

Upway is the leading marketplace for refurbished e-bikes across Europe and the United States. In the last 3 years, we went from 0 to $200M GMV with a small senior team of 5 engineers and have been growing the tech team since the beginning of year.

We are looking for business driven problem solvers that will help us scale to $1B+ GMV in the coming years.

Stack: TypeScript | NestJS | React | Shopify | PostgresSQL | GCP

Offers: https://careers.upway.shop/

Reach out directly: https://www.linkedin.com/in/augustin-l-53912b144/

PlantingSpace | Full-time | Remote (EU time zone) + Quarterly Meet-ups | https://planting.space

We’re building an AI system for analysts and scientists, based on a fundamentally new approach to reasoning and knowledge representation. Our approach differs from LLMs in that we compose algorithms symbolically to represent complex knowledge, and perform probabilistic computations. This enables the AI-driven application of statistical models to different problems, while providing the user with a verifiable reasoning path, and an assessment of the uncertainty in each answer. We are developing applications for analysis and research in domains such as Finance, Strategy Consulting, Engineering, Material Sciences, and more.

Ready to push the frontier of automated structured reasoning? Check out our current openings for:

* Program Synthesis Engineer

* Product Software Engineer

* Senior Product Manager

See detailed role info, and apply: https://planting.space/joinus/

Questions welcome! Get in touch: talent@planting.space

Goody | Remote | $200–250K + equity and benefits | Full-time

Goody is hiring a full-stack Staff Software Engineer who likes to ship at a startup pace and has an eye for exceptional UI/UX.

I'm Mark, the technical co-founder and CTO at Goody. Despite being something everyone does, gifting is one of the areas of commerce yet to be disrupted. Our goal is to make people's days by making gifting easy, while building a sustainable business on that market opportunity.

We're looking for engineers who like to build at a startup pace, have a critical eye for detail and user experience, and thrive when given autonomy and ownership.

Our product is used by Google, Stripe, Anthropic, Meta, NBCUniversal, Notion, and others, and we also offer a developer API for commerce.

Check out our jobs minisite at https://jobs.ongoody.com/swe and feel free to email me at mark@ongoody.com.

Shorebird | Mid-Senior across Web, Dart, Full Stack or C++ | Remote (North America) | Full-time | $150-230k + equity | https://shorebird.dev

Flutter/Shorebird founder here. Flutter is used by millions of devs (and nearly ⅓ of free apps submitted to AppStore), but is missing services for businesses. We sell Flutter-related Saas to 1000s businesses globally, on track to profitability early 2026. Need your help to build more products for Flutter developers.

We’re a small, senior team, making something people want. Tech: Dart, GCP, Cloudflare, React, C++. Shorebird operates almost entirely in the public over Discord. https://discord.gg/shorebird

https://shorebird.dev/jobs

PUNTT.AI |Founding AI-First Growth Marketer | Founding AE | Full-time | Hybrid in New York or San Francisco

Our mission is to kill the review. Free people to do meaningful work.

Founding Account Executive: Work directly with the Founders and CEO to help build and own our GTM motion from the ground up. If you're excited about building in public, owning revenue from zero to one, and working directly with founders—you’ll thrive here.

Ideal profile: - 2–5 years in B2B SaaS sales or agency partnerships. Experience selling into marketing or creative teams is a big plus.

More info & apply https://wellfound.com/jobs/3340879

Founding AI Growth Marketer: drive early pipeline and positioning. You’ll work directly with the CEO and own everything from narrative → campaign execution → GTM growth experiments.

Ideal profile: - 4–8 years experience in B2B SaaS, creative tech, or growth marketing. Strong writing chops, creative instincts, and a bias for speed.

More info & apply https://wellfound.com/jobs/3349975

Komodo Health | Applied AI Engineer | Full-Time | $200-$253k + equity... | SF/NY Once-a-month-few-days / Remote US. Can sponsor.

Healthcare in the U.S. is a mess. Komodo Health is fixing that—with data. We’ve mapped the patient journey across the country to build the most complete picture of disease burden and treatment gaps. Our customers are pharma, payers, and health systems who actually want to do something meaningful with that information.

We have an exciting product, marmot, that is AI-native, both in the interface as well as in development, and want to carefully grow high productivity teams around this offering. AI integrated with Komodo's data is giving some of the most unique, real world insights any of us has seen come out of the new LLM era. Our product was just featured on Times Sqaure too! https://www.linkedin.com/posts/komodo-health_last-week-our-d...

We are looking for highly independent individuals, who can work in a new, small, but empowered team. What will you be bringing? - Proven experience working on Agentic systems that solve real problems OR Some evidence you have the "instinct" Andrew Ng mentions as the differentiators of successful Agent builders. We also take full ownership of the product, so experience+readiness for fullstack development is a must. Core ML experience is not required and for this position, not relevant at all. The new LLM/Agent era is... different.

Perks will include annual conference trip, periodic travel to SF/NY for on-site, Executive Coaching, etc.

If this post sounds exciting, please apply at https://job-boards.greenhouse.io/komodohealth/jobs/806961600... (mention HN as the source). Please note, we can only consider applicants who are already in the US.

If you wish, please also email me at ramraj.velmurugan@komodohealth.com with an example of how you have figured out that instinct I mention above.

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 :)

—

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

—

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

—

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 zfs-hire@klarasystems.com 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 alex@zeven.ai

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.

Please send a short note + resume/portfolio to jobs@reveredefense.co with subject HN – Engineering.

Fundamental Research Labs | Fullstack, Product, + Software Engineers, Ex-founders, Researchers | Menlo Park, CA | https://fundamentalresearchlabs.com

We're an applied research company building autonomous, collaborative, and socially intelligent agents. Our small team includes computational neuroscientists, AI researchers, engineers, and builders from MIT EECS, Stanford NLP Group, Google X, Citadel, and beyond.

Our latest product, tryshortcut.ai, just launched over the summer to amazing reception and we’re just getting started.

We compensate well above market and provide generous equity.

We’re looking for:

—> Engineers and ex-founders to build Agent-first products. We have an organizational structure where product leaders are given great autonomy to experiment and ship fast.

—> Researchers to develop frontier technologies in the Agents domain. We do everything from sophisticated Agent orchestration to SFT/RL post-training of foundation models.

https://jobs.ashbyhq.com/fundamentalresearchlabs

*BLACKLANE IS HIRING!* (Berlin / Barcelona / London – HYBRID) https://www.blacklane.com/en/career/ped/

We are Blacklane, a global, premium chauffeur service company, operating in 50+ countries.

As part of our engineering teams, you will help develop the services that power the Blacklane, work on improving our back-office system, or solve problems around our products which allow business partners to integrate with the Blacklane platform.

We are looking for:

# Senior Software Engineer – Backend → Apply: https://grnh.se/3z4sljwi2us

# Software Engineer – Backend → Apply: https://grnh.se/lrj4si102us

Our stack includes Ruby, Go, TypeScript, and Java services (DDD) deployed on Kubernetes, communicating via SQS and Kafka. We use Postgres, MySQL, Elasticsearch, Redis, and DynamoDB, with AWS and Terraform for infrastructure.

Greenline | Founding Engineer Roles | Remote (U.S. only) | https://www.greenline.ai/careers

Greenline unlocks mortgage lending for self-employed borrowers.

We just closed our seed round led by Bowery Capital and Uncork to tackle this messy problem. More importantly, we're launching with the largest lenders and investors in the mortgage-backed securities market.

We're growing our founding team:

- product/ full stack engineer: own and accelerate customer-facing feature development

- backend: lead core, data-centric systems and infrastructure

- platform/ API: architect and build a public-facing ergonomic API for scalable integrations with enterprise systems, critical to unlocking key customers and partner-driven growth.