Bubblehouse | Fully REMOTE | Full-Time | $250k | Principal Engineer

Bubblehouse is a fast-growing custom and private loyalty platform. Headquartered in NYC, the entire team is fully remote and spread across US and Europe. We power loyalty programs for large brands, including household names.

We’re again expanding our lean team of extremely experienced developers. Companies are switching from other platforms thanks to the customizations and flexibility that we offer, enabled by our pace and technical excellence, which we intend to keep for years to come.

Tech-wise, we’re running on Golang, and using custom data storage on top of local key-value stores, colocating the storage and compute on dedicated hardware servers, and reading data directly from mmap’ed pages of the database. Ever came across HN saying that one can run Twitter on a single machine these days? We’re doing that in production.

Zero lines of React, almost zero third-party dependencies (carefully vetted), every line of JavaScript manually written with respect and understanding of the web platform. We render HTML server-side like it’s 2005.

Looking for:

1. Top to bottom understanding of the software stack, from the modern-ish web platform to CPU caches.

2. Thinking and problem solving outside the box. (We don’t _always_ go for unconventional solutions, but we do it often enough to require a person who can do justice considering the entire problem space at every step.)

3. Demonstrated ability and hunger to learn new things quickly. (Every month we’re doing things we have never done before.)

4. Broad experience across multiple programming paradigms, platforms and software stacks.

5. Demonstrated care for the software craftsmanship (which can take many forms).

6. Great spoken English, and ability to communicate 9am to noon in New York time zone.

We give you a literally fast-paced environment (with features delivered in days) where you need to solve very challenging problems with practical advanced technology, take on entrenched market leaders, and help entrepreneurs across small and large businesses delight their fans.

Send a plain text cover letter to andrey+hiring@bubblehouse.com. Help us see how you stand out. Summarize your experience. Link to 1–5 impressive things you’ve built and proud of, link to where we can see some of your code, include your portfolio/CV, describe the platforms and stacks you’re an expert in. How did you start programming? What are you most passionate about in technology? What are the most interesting or weird things you’ve done? What are your strongest held professional opinions? Please make your email easy to read, we’ll appreciate that.

(If you have applied before, no need to re-apply, we’ll reach out.)

Curious why some of these posts are downgraded? Is that to be considered a rating of the company? Dislike for the advert because it misses some details expected? Etc

Would be good if the downgraders left a comment explaining.

Note: I am not a job poster and not affiliated with any hiring posts here

VeritusAgent | https://www.veritusagent.ai | Full Stack Software Engineer | Hybrid - San Francisco | Full-time | $200k + 0.5% - 1%

We started two months ago and our AI agents are already live and making calls! We're scaling fast and hiring a full stack engineer to join our team in-person in SF

https://www.ycombinator.com/companies/veritus-agent/jobs/cvH...

Reach out to me directly!

Uncountable | NY, SF, London & Munich (In-Person) | Full-Stack Engineering

https://www.uncountable.com/hiring/hn

Uncountable accelerates R&D for industrial scientists across leading materials, chemicals, and life sciences organizations. With our SaaS solution, our customers get better products to the market in half the time. Uncountable was founded by MIT and Stanford engineers and has been profitable since 2016. Our team has grown from 50 to 100 over the last two years.

Full-Stack Engineers | $120k - $220k + Equity

---> Uncountable is looking for engineers who can spearhead the development of the Uncountable Web Platform. The position is heavily product-driven and comes with challenges across the stack.

--> Summer internships and working student positions are also available.

Learn more: https://www.uncountable.com/hiring/hn

Uncountable is hiring in New York City, San Francisco, London, and Munich.

Contact our CTO directly at jason@uncountable.com

CVector | Full Stack Software Engineer | USA | REMOTE | Full-time | $75k – $120/yr + 0.3% – 1%

CVector builds software to make energy systems smarter, more reliable, and autonomous. We integrate real-time data visualization and analytics to help power generation stations, chemical plants, and other critical infrastructure make informed decisions in rapidly changing environments. You'll help create intuitive, robust web apps and backend systems, shaping tools that directly impact industrial operations and energy reliability.

Remote-first team with occasional domestic travel to connect with users directly. Recent graduates may need to relocate.

Full Stack Software Engineer: We're looking for a passionate Full Stack Software Engineer comfortable working across our stack (Python, Typescript, React, Supabase, MQTT, TimescaleDB, PostgreSQL, AWS, FastAPI).

Reach out to me at jnapoli+hn@cvector.energy

Come work with me @ AllTrails and help lead our full-stack, frontend, backend, and mobile teams.

Role: Director of Engineering — AllTrails (San Francisco / Remote)

About Us: AllTrails is the most trusted platform for outdoor exploration, helping millions of people discover and enjoy trails every day. We’re consistently ranked among the top Health & Fitness apps and were named Apple’s App of the Year in 2023.

Role Overview: You’ll lead multiple engineering teams across the stack, set technical strategy, and work closely with product and design to deliver a high-quality experience for our global community.

What We’re Looking For: • 10+ years of software engineering experience, with 5+ years in engineering leadership • Experience managing multi-disciplinary teams (frontend, backend, mobile) • Strength in technical architecture, team development, and cross-functional collaboration

Compensation & Benefits: • Competitive salary, equity, comprehensive benefits, unlimited PTO, monthly “Trail Days,” and a collaborative, mission-driven culture.

Rayni (https://www.rayni.ai) | Chicago - Hybrid or Remote | Full-time | Founding Full Stack Engineer

Mission: We accelerate scientific discovery. We are starting with helping scientists operate their instruments (like Mass Spectrometers) faster with our Gen AI-powered platform.

Impact: We help scientists develop new drugs faster, analyze diseased blood samples faster, study brain cancer faster, etc.

Funding (> $1.5M): Funded by tier-1 VCs, including winning the biggest academic accelerator program on the planet - New Venture Challenge at the University of Chicago. Past winners include Venmo and Grubhub, among others, over the last 25+ years.

Who are we hiring: 3+ YOE in full-stack engineering with a frontend focus (80%) and backend (20%).

You will: - Make fundamental decisions about the frontend stack and product vision - Work with scientists to convert their needs into features. - Long term: Help build the product engineering team, lead and mentor new engineers - Long term: Scale the product to millions of users

Complete job post: https://rayni.notion.site/Founding-Full-Stack-Engineer-2412a... More about the company, culture, and benefits: https://rayni.notion.site/Rayni-Careers-2312a8a0f8fe803ab5bb... Founding Story: https://polsky.uchicago.edu/2025/07/02/how-rayni-turned-scie...

CreativeMode (S24) | https://creativemode.net | On-site - San Francisco, CA

CreativeMode is building Lovable for video game mods, starting with Minecraft. In our first three months, we built the most powerful no-code modding platform ever for Minecraft and created a double digit percentage of all mods ever released. We're building an entirely new category of gaming tools. Minecraft is only the beginning.

We're hiring a Founding Engineer who wants to build at the intersection of tech and gaming. Ideal candidates have a passion for the category and have experience building production-level LLM/AI applications or are killer full-stack engineers who can own product features end to end.

Ideally 3+ years of experience

Email me at wilson@creativemode.net with your resume and a short blurb on why you'd like to join the team.

Roundtable | https://roundtable.ai | On-site San Francisco, CA | Full-time

Roundtable is a research and deployment company building the proof-of-human layer in digital identity. Roundtable seeks to research and build real-world Turing Tests, and to productize these developments in bot detection, fraud prevention, and continuous authentication.

We're hiring a Member of Technical Staff. This is not a typical “Founding Engineer” position. In particular, this role will involve more research than similar positions. You should be prepared to spend around half of your time on research and half on engineering.

The ideal candidate has experience in both. However, we don’t strictly require research experience as long as you have a strong quantitative background and an eagerness to learn. We do require proficiency in both web development (Javascript, Node.js) and Python.

If you're interested shoot an email to matt@roundtable.ai with your resume and a short blurb on why you're interested (note: we are unable to offer visa sponsorship at this time).

Spacelift | Remote (Europe) | Full-time | Senior Software Engineer | $80k-$110k+ (can go higher)

We're a VC-funded startup (recently raised $51M Series C) building an infrastructure orchestrator and collaborative management platform for Infrastructure-as-Code – from OpenTofu, Terraform, Terragrunt, CloudFormation, Pulumi, Kubernetes, to Ansible.

On the backend we're using 100% Go with AWS primitives. We're looking for backend developers who like doing DevOps'y stuff sometimes (because in a way it's the spirit of our company), or have experience with the cloud native ecosystem. Ideally you'd have experience working with an IaC tool, i.e. Terraform, Pulumi, Ansible, CloudFormation, Kubernetes, or SaltStack.

Overall we have a deeply technical product, trying to build something customers love to use, and have a lot of happy and satisfied customers. We promise interesting work, the ability to open source parts of the project which don't give us a business advantage, as well as healthy working hours.

If that sounds like fun to you, please apply at https://careers.spacelift.io/jobs/3006934-software-engineer-...

You can find out more about the product we're building at https://spacelift.io and also see our engineering blog for a few technical blog posts of ours: https://spacelift.io/blog/engineering

Additionally, we're hiring for a new product we're building, Flows[0]. Mostly the same requirements and tech stack, without the devops bits. If you'd like to apply specifically for that, just mention "new product" in the cover letter field.

[0]: https://events.spacelift.io/devops-next

/Noona is Yelp + TikTok | GO/VUE | REMOTE

/$1500mo (3mo) → $100K-300K FTE + 0.5%-3% equity

/Our final boss is to de-throne Yelp with co-op

/Validated, 12 paid business users pre-mvp and growing

/Next eoy milestone: 100+ users, $150000/y (how i pay you)

/Founding Engineer? hn@joinshop.co https://x.com/trynoona

CONS: self-funded, no vc

SUMMARY: "...highly (positively) addicting habits for interacting with offline experiences through time-sensitive events."

Loop | loop.com | Engineering, Product | On-site San Francisco, CA, Chicago, IL

Loop is on a mission to unlock profits trapped in the supply chain (https://www.loop.com/article/unlock-profit-trapped-in-your-s...) and lower costs for consumers. Bad data and inefficient workflows create friction that limits working capital and raises costs for every supply chain stakeholder.

Loop’s modern transportation cost management platform uses our domain-driven AI to harness the complexity of supply chain data and documentation. We improve transportation spend visibility so companies can control their costs and power profit. That is why industry leaders like Nvidia, Verizon, Dell, J.P. Morgan Chase, ABB, Estee Lauder, Tyson Foods, Yeti and Olipop, work with Loop.

1. Raised $100m+ from JPM GEP, Founders Fund, 8VC, Susa Ventures, Flexport, Index.

2. 250+ paying enterprise customers with multiple-year contracts.

3. High-caliber team of engineers and operators from Google, Scale AI, Flexport, Uber, Rakuten, Square, Meta, Stanford, Brown, Princeton, and Yale.

Fullstack Engineer San Francisco - https://job-boards.greenhouse.io/loop/jobs/4102236004

Fullstack Engineer Chicago - https://job-boards.greenhouse.io/loop/jobs/4830548004

AI Engineer San Francisco - https://job-boards.greenhouse.io/loop/jobs/5391540004

Product Manager, San Francisco - https://job-boards.greenhouse.io/loop/jobs/5602148004

Engineering Director, San Francisco - https://job-boards.greenhouse.io/loop/jobs/5597686004

Other roles at https://www.loop.com/company/careers

Neuralwatt | https://neuralwatt.com | REMOTE (US – Seattle/Denver/Boulder metros only) | Full-time | $180k–$220k DOE Energy is the #1 constraint in new datacenter buildouts. Neuralwatt is reshaping AI compute around energy efficiency to maximize revenue per kilowatt. We’re a VC-backed, early-stage startup building optimization tools for AI, HPC, and datacenter workloads.

We're hiring 2 experienced founding engineers to help architect our core systems and work directly with customers.

What you'll do:

Technically: Architect critical datacenter infrastructure - Write Rust and Python - Measure real-world energy impact - Design state-of-the-art AI-led optimizations

Non-technically: Help build the business and win customers - Present at conferences - Develop marketing and company materials

Requirements:

- 5–10+ years of software development experience

- Thrive in ambiguous, outcome-driven environments

- Experience working closely with customers

- Clear communication and strong leadership

- Familiarity with LLM/AI infrastructure

Location: Remote-first, but we meet regularly in Seattle/Denver metro areas.

To apply: Email: scott@neuralwatt.com Subject: HN Hiring Include: - Resume - GitHub profile - A short note on why you're interested.

Please note: At this time, we are unable to offer visa sponsorship.

Stainless | Engineers, EMs, Former Founders, GTM, Business, more | NYC & SF ONSITE | Full-time

Stainless is building the platform for high-quality, easy-to-use APIs.

When you `npm install openai` or `pip install anthropic` or `go get …cloudflare`, for example, you’re downloading code that we generated.

We’re ~3y old, ~35 people, have strong revenue, several years of runway, and great customers (including OpenAI, Anthropic, and Cloudflare). We’re backed by Sequoia & a16z.

As one of our first 30 engineers, you’ll get autonomy to build great products, skilled peers, opportunity for tremendous impact, and competitive salary, benefits, and equity.

We’re looking for exceptionally productive, thoughtful, tasteful, and kind people with a passion for making software development better for everyone.

Want to build the future of API tooling? See more at stainless.com/jobs

Elyos (https://elyos.ai) | London, UK | ONSITE | YC S23

Company: We're the UK's fastest growing AI voice company (~30% MoM) - very deeply focused on the trades industry right now (think your friendly neighbourhood plumbing company).

We're a small but experienced team hiring 3 more to join:

- Founding Engineer - Founding SDR - Founding Operations Lead (customer success)

Tech: GKE, python, postgres, telephony/media streaming, realtime LLMs, contextual eou detection, the occasional REST API.

https://careers.elyos.ai/ or message me - matt (at) elyos.ai

Mention bananas for extra kudos.

krea.ai | Distributed Systems Eng. & Data Engineers | San Francisco (on-site), CA

I'm the cofounder & CTO of Krea (https://www.krea.ai).

We are a startup in San Francisco building browser-based AI creative tools to improve the workflows of artists, designers, and professional creatives.

Small team (~20); millions of active users; and raised over $83M from top Silicon Valley investment firms.

We're looking for talented engineers who want to tackle hard technical challenges with smart people while building a creative platform that big companies and startups will rely on.

The job:

- Build distributed systems to process massive (billions of files, petabytes), amounts of image, video, and 3D data, solving scaling bottlenecks as you go.

- Build data pipelines and deploy ML models to make sense of raw data (e.g. find clean scenes within videos).

- Learn ML engineering from world-class researchers on a small tight-knit team. As you’re building data pipelines, you’ll contribute to foundation image, video, and world models from 0 → production, and see them used by millions of Krea users.

- Play with massive amounts of compute on huge Kubernetes GPU clusters; our main GPU cluster takes up an entire datacenter from our provider.

Tech stack: python, pytorch, k8s, a rotating cast of data tools (e.g. DuckDB, massive relational DBs, PyArrow, etc.)

You should apply if you are an excellent generalist engineer with strong backend experience and an intuition for systems design. Bonus points for deep experience with distributed systems, kubernetes, and existing ML or data experience (but not required!). Cool side projects are a green flag.

A few links about us:

- Sneak peek of our real-time video model → https://x.com/krea_ai/status/1961074072487620635

- Technical report for FLUX.1 Krea, our latest text-to-image model → https://krea.ai/blog/flux-krea-open-source-release

- HN discussion around FLUX.1 Krea → https://news.ycombinator.com/item?id=44745555

You can contact me at:

  d+hn@krea.ai

RevEng.AI | London, UK | Full-Time | ONSITE+PART REMOTE | https://reveng.ai

RevEng.AI is building foundational AI models to identify malicious threats and security vulnerabilities inside software. We're a seed stage startup having raised $4.25m from top tier VCs across the US and Europe. You’ll play a key role in advancing our platform pushing the boundaries of AI-driven program analysis.

We're looking to hire security engineers and security researchers with experience in program analysis, reverse engineering, vulnerability research, machine learning, and malware analysis.

* 5+ years of experience

* Masters or PhD in a relevant area for the security researcher role

* Hybrid working environment but ideally commutable to London, UK * Solid understanding of software engineering design

* Ability to thrive in a fast-paced start-up environment

To apply or learn more, email contact[at]reveng.ai with "hn" in the subject line.

[delayed]

Stellar Science | Hybrid (USA) Albuquerque NM, Washington DC (Tysons VA), Dayton OH | Full time, interns/co-ops | U.S. citizenship required | https://www.stellarscience.com

Company: We're a small scientific software development company that develops custom scientific and engineering analysis applications in domains including: space situational awareness (monitoring the locations, health and status of on-orbit satellites), image simulation, high power microwave systems, modeling and simulation, laser systems modeling, AI/ML including physics-informed neural networks (PINN), human body thermoregulation, computer vision and image processing, high performance computing (HPC), computer aided design (CAD), and more. All exciting applications and no CRUD. We emphasize high quality code and lightweight processes that free software engineers to be productive.

Experience: Other than interns, we currently require a Bachelors degree in physics, engineering, math, computer science, or a related field, plus preferably 3+ years of work experience or a Masters or PhD in lieu of work experience. (Roughly 30% of our staff have PhDs.)

Technologies: Mostly C++23, Qt 6.9, CMake, git, OpenGL, CUDA, Boost, Jenkins. Windows and Linux, msvc/gcc/clang/clangcl. AI/ML and other projects use Python, some projects use Java or Javascript/Typescript/React.

Apply online at https://www.stellarscience.com/careers/.

Railway | Infra eng - Storage, Infra (Platform) eng, Product Eng (full stack)| REMOTE (Worldwide) | https://jobs.ashbyhq.com/Railway?utm_source=DayMzWzJ0P

Tired of trying to beat kube into shape? Does writing YAML to ship code fill you with utter dread? Dream of a future where deploying software is simple, and you don't need an army of infrastructure engineers to build that perfect janky bash script™ to make life easy?

We're Railway, and we think infrastructure can be better. So far we've built out a platform loved by hundreds of thousands of users who simply tell us "Give me Postgres", "Deploy this repo", and we make it happen

Fair warning! The problems are complex: home-rolled hypervisors, cut-above container orchestration, over/under/whateverlay networks, virtio device drivers, edge proxies, IAM that doesn't suck, kitchen sinks - we need to build it and we're looking for likeminded individuals who think this stuff is fun.

Three open roles (apply below!):

+Infra Engineer - Storage: Apply here: (https://jobs.ashbyhq.com/Railway/25d8444a-47dc-4084-ae56-29a...) Blog post about the team: (https://blog.railway.com/p/data-center-build-part-one)

+Infrastructure Engineer(Platform): -Apply here:(https://jobs.ashbyhq.com/Railway/b8072f95-043f-404d-a313-f0b...) -Blog post about the team: (https://blog.railway.app/p/team-spotlight-infrastructure-eng...)

+Product Engineer (full-stack): -Apply here: (https://jobs.ashbyhq.com/Railway/6ddcfe47-6cce-469b-ba6d-4f0...) -Blog post about the team: (https://blog.railway.app/p/team-spotlight-product-engineerin...)

See you soon, and happy shipping.