Flok builds and runs explainable AI (not LLM-based) physiotherapy clinics for the UK National Health System.
We’re a real clinical service, built on software solving hard problems across expert systems and real-time video streaming, providing treatment for (chronic) back pain, and soon, other common conditions. Flok is both a "clinic" and a consumer product company, so we can make our patients' experience as good as possible.
Most recent press about us on the BBC: https://www.bbc.co.uk/news/articles/cy4y9xm1eejo
We also recently gained class 2a medical device certification for our technology: https://www.digitalhealth.net/2025/10/ai-powered-physiothera...
Our favourite languages: Python, Typescript, Rust.
Read more and apply at https://careers.flok.health or find me online and DM me!
Zed is a company for developers, by developers. All 3 of our founders have spent years in the trenches writing software and still do it almost every single day. We know the only way to build the world's best code editor is by equipping every single member of the team to do the best work of their career.
We've raised $42M to support our ultimate vision, a new way to collaborate on software, where conversations about code remain connected to the code itself, instead of being tied to aging snapshots or scattered across different tools. The first step was creating a high-quality editor to serve as the user interface. Now this new investment lets us expand to tackle the next phase of our plan. We're developing a new kind of operation-based version control that incrementally tracks the evolution of your code with edit-level granularity, and we're integrating it into Zed to make collaboration, both with agents and teammates, a first-class part of the coding experience.
Backend Rust Engineer - https://zed.dev/jobs/backend-engineer
Rust Engineer - https://zed.dev/jobs/rust-engineer
Product Manager - https://zed.dev/jobs/pm
Head of Open Source - https://zed.dev/jobs/head-of-open-source
Support Engineer - https://zed.dev/jobs/support
Early Career SWE, 2026 Grads (Rust, C/C++): https://jobs.ashbyhq.com/category-labs/0dfdffdf-cefb-48fb-bb...
Senior SWE (Rust, C/C++): https://jobs.ashbyhq.com/category-labs/45f674b2-d904-482e-a5...
Smart Contract Engineer (Solidity): https://jobs.ashbyhq.com/category-labs/776ce314-aa12-471b-92...
Senior Researcher, Systems: https://jobs.ashbyhq.com/category-labs/015934c5-66e5-4042-94...
Common Prefix is a science-first blockchain consulting company. Our vision is to make blockchains usable for mainstream users and everyday people – paying at the supermarket, remittances, moving money across borders, saving, investing – and solving the real problems of usability, scalability, and interoperability that come with it. We're a 30-person team, half scientists (cryptographer PhDs, post-docs, and professors) from renowned universities, half engineers with long web2 experience. A lot of our field is broken and we're trying to make a small contribution in fixing it, by introducing provable security and proper engineering practices across the board. What we're looking for: Software engineers who can solve problems, are smart, get things done, and enjoy working on the bleeding edge, learning about cryptography, and working from first-principles. Auditors who can write and read code, especially low-level cryptographic implementation code (zero knowledge verifiers, signature schemes, etc), consensus (PoW, PoS), or smart contracts (everything DeFi). Tech stack: Doesn't matter, we'll teach you. But we work mostly with Rust. Open roles: * Software Engineer, https://commonprefix.notion.site/sw-folk * Auditor, https://commonprefix.notion.site/auditing-folk We offer: - $80,000–$160,000 / year cash - Local from Athens, Greece, or remote, preferably in Europe - Conference participation in exciting scientific and engineering venues, 2-3 times per year - The opportunity to work and learn from world-class scientists from major universities in the field of blockchains, cryptography, and consensus If you're interested in joining our team, please reach out to careers<at>commonprefix<dot>com with the subject line "HN: <Job Title>".
MixRank processes petabytes of data every month from web crawling. We have hundreds of customers using our data products including Google, Amazon, Facebook, Intel, and Adobe, across industries including Finance, Recruiting, Sales, Marketing, and Security.
We’re a fully-remote company with a global footprint in over 20 countries. We're growing, profitable, employee-owned, no dependence on outside funding. Applicants from all geographies and backgrounds are welcome.
We are looking for passionate individuals for whom programming is not just a job but it’s something they love to do. We're obsessed with computers, programming, big data, databases, compilers, hardware, math, data science, and the internet. Does this sound like you? Please apply to join our team.
Our code base is very friendly to new contributors. You'll have a fully-functional development environment within hours (fully automated) and be pushing commits on your first day. Deployments to production happen multiple times per day and finish in less than 2 minutes. Effectively all of our codebase is written in Python, Rust, SQL, Javascript/TypeScript, and Nix. The core technologies you'll need familiarity with to be productive are Python, PostgreSQL, Linux, and Git.
We operate at a larger scale than typical startups. We operate two datacenters with high performance servers we've built that are capable of dealing with the volumes of data we process. We've implemented our own distributed file system. We do full-scale web crawls. We download and perform static analysis on the entire universe of Android APKs and iOS IPAs that are published. Unlike a typical startup where you'll spend half of your time in meetings, and the other half fixing bugs from Jira tickets— at MixRank you'll get to challenge yourself with difficult technical problems that will help you to grow as an individual.
We're hiring continuously for the positions below— they aren't singular positions that will close once filled. Our philosophy on hiring is that the candidate is more important than the position. For each new member of the team, we design a custom role and responsibilities that are specialized to their interests. Other companies will come up with a long list of specific requirements for a position with the expectation that you'll exactly replace someone from the team, or that you'll be the perfect tetris piece that satisfies the job requirements decided by a committee. MixRank is more pragmatic: we'll first get excited about having a unique individual on the team, then we'll figure out the best way to accommodate their specific talents.
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Junior Software Engineer - Remote (Global), Full-Time
We're looking for remote junior engineers that have 0-3 years of professional experience in software, and 5+ years of curiosity exploring computers, programming, and technical hobby projects. This is an open-ended entry role with mentorship and diverse opportunities to work on all areas of our product: databases, distributed systems, infrastructure and tooling, data analysis, machine learning, frontend/backend web development, APIs, data mining, data modeling, and more. To stand out, please highlight what makes you unique: passion for computing, curiosity and side projects, work ethic, niche research, etc.
Ideally you've already graduated, but if you still have one or more years left of school, please feel free to apply anyway, and if you're the right fit for the team we'll figure out a way to accommodate your schedule.
https://www.ycombinator.com/companies/mixrank/jobs/Fnwsojk-j...
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Software Engineer - Remote (Global), Full-Time
We're hiring generalist software engineers to work on web applications, data mining, machine learning/data science, data transformation/ETL, data modeling, database scaling, infrastructure, devops, and more. We'll cater the role to whatever subset of these areas match your interests.
Beneficial experience includes PostgreSQL, Python, Rust, Linux, TypeScript, Nix, frontend/backend web development, and data mining.
https://www.ycombinator.com/companies/mixrank/jobs/RXQspen-s...
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I’m Kiran, Chief of Staff (CoS) at MixRank, a fully remote data startup building go-to-market intelligence. We’re US-incorporated but hire globally, and we’re bringing on new teammates to join a fast-moving team with real ownership and impact.
ThreatMark protects >50M end users from finacial fraud and saves > $100M every year in losses. We are working with top banks in EU and US to protect their end users. We develop large-behavioral models that recognizes returning users by their mouse movements, keystroke timings and sensoric data (accelerometer, gyroscope). We detect cyberthreats (e.g. malware, phishing, scraping) by exploiting browsers/sandboxes of devices. We manage ~PB scale of data and provide realtime scoring in milliseconds driving authentication/authorization flow (2nd factor).
Stack: [python, typescript, rust], [redis, postgresql], [aws, terraform] ...
We are looking for exceptional engineers to build with us and be part of the success:
- Research Team Lead [hands-on role] (leading world-class ML engineers to success - focus, context translation, project management, measurement, ...)
- Backend Engineer [rust, python] - low-latency stream processing engine, rewrite python microservices to rust
- DevOps Engineer (IaaC in AWS)
- DevSecOps Engineer (blue team - designing, implementing secure infrastructure)
- Engineering Team Lead [hands-on role] (structure, organize, help, elevate) - lead of team dealing with backend - low tail latencies, distributed systems, petascale
- Product Manager (self driven, tech-enabled go-getter - expert on fraud and/or scaling a startup from product perspective)
We are also looking for other key roles:
- CRO - be responsible for growth in US & EU
If you are interested, please email us @ career@threatmark.com with subject "HN Who's Hiring"
If you don't find the right role here or at https://www.threatmark.com/careers/, write us anyway if you believe you can be good fit :)
Krystof Hilar, Co-Founder & CTO
We're a new venture inside IOHK building the future of Bitcoin DeFi. Our mission is to unlock Bitcoin's economic potential by building a secure, trust-minimized protocol that brings more utility to native BTC.
Tech Stack: Rust, Bitcoin, BitVM (X,1,2,3, and beyond), RISC-V, etc.
We're hiring for a small, mission-driven, and crypto-native team.
If you're passionate about Bitcoin and rigorous open-source engineering, we'd love to hear from you. If interested, please reach out directly to me at hans.lahe [at] iohk.io
If you live for low-level performance wins and distributed systems wizardry, you’ll feel at home here.
Apply here: https://www.taho.is/careers/staff-product-engineer
We’re building the first cloud performance layer — think AI workloads that run 30x faster at 90% lower cost.
At TAHO you’ll: Hack on Rust + WASM to design resilient, high-throughput runtimes. Build low-latency comms (gRPC, libp2p, or your own P2P magic). Ship code that directly bends compute costs and scales across cloud, edge, and HPC.
This isn’t a “maintain legacy” gig — it’s greenfield infra at startup speed with equity, full remote, and the chance to shape a category-defining system.
If optimizing runtimes and squeezing every cycle out of hardware gets you hyped —> we want you.
Check us out at https://taho.is/
Spruce lets users control their data across the web. Instead of users logging into platforms, we believe platforms should request to access data vaults controlled by users.
The demand for trusted digital ID is accelerating as AI deepfakes begin to destroy most of the ways we use to verify identity today. How private or secure is it to hold your driver's license or passport up to a webcam to get a bank account? Was it ever private or secure? Stable diffusion can break so much of this already. Society will need trusted digital IDs, and our mission is to allow them to be controlled by individuals, with safeguards to prevent descents into surveillance states and checkpoint societies.
We are the main implementers of category-defining initiatives such as the digital ID program for the California DMV, and the verifiable digital credentials program in Utah. We are private sector participants in NIST's National Cyber Security of Excellence initiative for privacy-preserving digital ID.
Today, we are hiring highly capable engineers who care about making a real impact in improving public services, digital autonomy, and user privacy for the world. We work closely with public sector agencies, and everyone on our team has a high regard for those in the public service. We have a strong engineering culture. We are not a SaaS or AI company, and our roles are not for the faint of heart. You will be expected to work hard and learn a lot in this role.
Our engineers are incredibly ambitious. On any given day, they may write great Rust/C#/TypeScript, deal with mainframe dumps, read policy documents, respond to technical RFIs/RFPs, manage on-prem environments, implement new NFC + Bluetooth protocols in Swift/Kotlin, create CI/CD processes that enforce W3C accessibility guidelines and i18n requirements, rewrite lost specs from disassembled binaries, and design new protections for public key infrastructure. It is a team effort, and people with T-shirt shaped skills are able to collaborate and learn a ton from each other every day.
The potential impact of this work cannot be understated, and this is not the right job for you if you want to "join a cool AI startup" and make a fast exit. However, if you care about our mission, then you will have the opportunity to make meaningful outcomes for society that will make you feel proud.
See our roles here: https://jobs.lever.co/sprucesystems/
If you feel very strongly about what we do, please email me directly with your reasons and resume at wayne AT spruceid.com.
Platform Engineer - https://jobs.lever.co/meili/b2d59837-20d6-470d-899b-8ddc081f...
Senior Software Engineer Rust - https://jobs.lever.co/meili/736ec392-9070-49b9-9a63-7db05a1c...
Our projects range from high-performance computing libraries to web applications and modern DevOps pipelines. We focus on automating complex tasks and creating user-friendly interfaces to improve the working lives of scientists and researchers.
We move quickly, trust each other to deliver, and give you space to own your work from day one.
We're currently hiring for:
* Senior Python Developer
* Senior Rust / C++ Developer
More information and how to apply: https://www.oxidian.com/#join-us
- Radar is the geo-location dev tool
- Doing 1B+ API calls per day
- Our main languages are Rust and TypeScript, we also use mobile and offline pipeline languages (Python, Scala, and Terraform).
- We're based in NYC with our HQ in Union Square and remote friendly (US)
Interesting things we're working on:
- HorizonDB, our Geospatial database written in Rust
- Precise indoor location more accurate than iOS and Android leveraging Ultra-Wideband, other mobile sensors and ML.
- Extracting raw map data from satellite maps and the web leveraging ML and AI
- Anomaly detection to identify spoofed locations
- Mobile infrastructure that automatically configures itself optimizing battery-life and location accuracy for different use-cases over time
- Multi-Region AWS K8s deployment, 99.99%+ availability
- Frontend tools to visualize and debug location data at scale
Check out our jobs page here: https://radar.com/jobs#jobs If you have any questions, feel free to reply here or you can e-mail me at tim@radar.com
work [at] yeet.cx
You can visit us at https://yeet.cx/
Or try our interactive sandbox at https://yeet.cx/play
For more jobs check out https://yeet.cx/careers
RELIABILITY AND PERFORMANCE ENGINEER: https://jobs.ashbyhq.com/feldera/709c14e4-1fa9-46b4-9ff8-078...
- Strong background in systems engineering, performance testing, or site reliability engineering. - Fluency in Python and Linux fundamentals. Rust experience is a plus. - Experience with distributed systems and database concepts (consistency, fault tolerance, transactions). - Experience with CI/CD/Infrastructure as Code: GitHub Actions, Docker, Kubernetes. - Hands-on experience running large-scale and long-running workloads, preferably in a cloud-native environment. - Curiosity, rigor, and the ability to design experiments that simulate messy real-world conditions. SOLUTION ENGINEER: https://jobs.ashbyhq.com/feldera/544aff74-263f-4749-a4d0-af0... - 5+ years experience in solution architect, customer engineering or solution engineering roles. - Strong background in distributed systems, databases, cloud infrastructure, and modern data platforms. - Experience with data-intensive systems in production (e.g., Kafka, Delta Lake, Iceberg, Kubernetes, monitoring/observability stacks). - Exceptional debugging and problem-solving skills, especially in customer-facing contexts. - Excellent communication skills, both for customer-facing and internal interactions. - Ability to write and maintain high-quality technical docs and playbooks. https://jobs.ashbyhq.com/felderaFeel free to email with your resume gz @ domain, put HN in subject.
You will be building procedural simulation models and the supporting infrastructure and applications. We're a small team, so this means everything from CUDA kernels and Pytorch notebooks to web-apps. Our stack is multi-lingual and spans from very low to very high level code. We use both our own models and external providers.
Our team is hybrid-remote, being primarily based in San Francisco.
Our stack: Python (Pytorch/jax), Typescript(React etc), Rust/C++, Ghidra
We're looking for exceptional research engineers who aren't afraid to get their hands dirty. Experience with computational geometry or compilers/language design/formal methods is a plus.
Formal qualifications are less important than passion and skill. We're building our dreams, we hope you will feel the same.
If interested, email me at: simon+hn@zoetro.pe
We make instruments and software that enable scientists to study biology at single-cell resolution. Our technology features in over 7,000 scientific publications (https://www.10xgenomics.com/resources/publications), and is used across the world by top research institutions, hospitals, and pharmaceutical companies to study cancer, immunology, developmental biology, and more.
Our user-facing applications - which include the public website, a web-based analysis platform, visualization apps, instrument UIs, and more - have React/Typescript frontends and Golang backends, with Rust + C++/CUDA for analysis algorithms. Our instrument control software, which automates complicated microfluidics, motion, and imaging subsystems are written in C++, Python and Golang. If you want to use your software skills to push forward the frontiers of biology, please check us out.
Our tech stack includes: C++, CUDA, Rust, Go, Python, Typescript, Bazel, etc
Open Roles:
- Staff Software Engineer
- Software Engineer III - Frontend
- Senior Software Engineer - AI Solutions
- Staff Software Engineer - AI Solutions
I'm a Sr. Staff Software Engineer here. Happy to answer questions you might have, I'm easy to find on LinkedIn if you need to know more.
Apply: https://careers.10xgenomics.com/careers?department=Engineeri... Website: https://www.10xgenomics.com
Arcol (arcol.io) is a small, high talent density team building the future of building design - a future that's collaborative, fast, and intuitive. We're a web-native, fully collaborative 3d design tool modernizing the experience of architectural design for teams of all sizes.
We're looking for senior engineers with experience in modern web technologies - some of our key technical building blocks are Typescript, Rust, wasm, WebGL - and a strong ownership mindset. Experience with computational geometry, computer graphics, or similar a strong plus. This role sits at the intersection of solving deep technical foundational challenges with shipping a product that solves real problems for real people.
Reach out to me directly at thomas@arcol.io or peruse our careers page (https://www.arcol.io/careers) - we'd love to hear from you!
Foxglove is the leading observability stack for robotics and physical AI. We accelerate robotics development with logging, data management, and multimodal visualization. We're well funded (Series A, ~45 people) and assembling the most talented team in the industry to build a platform for all types of robots. Sound interesting? Join us!
- Senior/Staff Frontend Engineer (typescript, react, webgl, rust, wasm)
- Senior/Staff Backend Engineer (rust)
- Senior/Staff Backend Engineer (rust, remote - Australia/NZ)
- Forward-Deployed Engineer
- Account Executive
- Solutions Engineer, Robotics
- Dev Relations
Remote friendly: All roles we are open to remote for experienced candidates (staff-level or prior experience at a top AV or robotics company)
Chroma is the open-source search and retrieval database for AI applications. It's an open-source database with vector, regex, and full-text search. We support local, single-node, and cloud hosting. Help build the future of context engineering!
We're a team of 17, all engineers today. We work in Rust, Python, Typescript, and Go.
We're hiring for these areas:
- Product design
- Production engineering
- Platform engineering (Rust)
- First GTM hire
Apply here: https://jobs.ashbyhq.com/trychroma/9ed3aee8-07dd-44e3-9ca1-d...
More details at: https://careers.trychroma.com
Work with world-class engineers - including two teammates who placed in the top 10 of the One Billion Row Challenge (1BRC).
As a specialized database, QuestDB stores, processes and analyzes time series data in real-time, with a focus on reliability, extreme performance and simplicity. It provides best-in-class hardware efficiency and robust features, saving costs and accelerating time-to-value.
Our open source repository has gathered 16k stars and QuestDB is one of the fastest growing database in the category. We are a product-first company with a large community of developers. As a team, we are globally distributed, remote-first and backed by leading venture capital firms and Y Combinator.
Teams have had success with QuestDB across a wide range of industries, such as Financial Services, Energy and Space Exploration. Category leading companies such as OKX, Mizuho, and Airbus rely on QuestDB for large-scale, data-intensive production systems. Emerging and disruptive startups also leverage QuestDB to gain a significant edge within traditional industries.
To apply: https://questdb.com/careers/core-database-engineer/
Backend development in support of web-based augmented reality experiences and games for mobile devices. API integration and development. Management of cloud infrastructure and services.
Key technologies are Node.js, Rust, PostgreSQL, Digital Ocean. Experience with video streaming (RTMP, WebRTC). Some degree of familiarity with TypeScript, Vue.js, and Babylon.js is desirable.
Strong interest in sports is ideal (although fandom is optional).
I’m the hiring manager, no intermediaries. I’m not interested in hearing from outsourcing agencies or recruiters. Candidates only, please. Thank you. : )
raven@aroundar.com
Estuary is a VC-backed startup building the next generation of real-time data infrastructure. Our platform, Estuary Flow, combines change data capture (CDC), stream processing, and declarative configuration to unify real-time and batch data movement.
We’re open-source, developer-first, and focused on making data engineering radically simpler.
Estuary is a small, high-trust team with deep experience in distributed systems, stream processing, and data tooling — and we’re growing quickly.
We’re hiring for:
Senior and Staff Backend Engineers (Integrations) – 5+ years of backend engineering experience. Proficiency in Go; Rust is a big bonus.
Own and scale high-impact systems that power real-time data pipelines. You’ll work on complex integrations with external APIs and databases, improve our internal connector frameworks, and tackle deep challenges in performance, reliability, and developer experience.
Fullstack Engineer (UI Team) – Our first fullstack hire, working across Rust + React/TypeScript. High-impact role shaping the customer experience: build GraphQL APIs, optimize Rust backend systems, and deliver product features end-to-end.
https://estuary.dev/about/#careers
What we’re looking for: Engineers who care about building reliable, maintainable systems and enjoy working with complex APIs and data flows. We value curiosity, clear communication, and a willingness to learn.
Bonus points for experience with CDC tools, open source contributions, or fast-paced startups.
To apply: Email your resume to careers@estuary.dev
Smarkets is a betting exchange for sports and political trading that has handled over £37 billion in volume since 2010. Our company mission is to fix the betting industry with the best products and best prices.
We are currently looking for:
Senior Software Engineer - Backend, Distributed Systems, Rust, London, UK - https://smarkets.com/job/41fba25f-0896-46d5-a093-8ebbc9e1624...
Software Engineer - Backend, Python, Rust, London, UK - https://smarkets.com/job/aaaf901f-77c0-4b35-9240-ed4cfa668ba...
Senior Quantitative Developer, London, UK - https://smarkets.com/job/5502cdbe-6246-47ec-890b-2f2817e3cf1...
Dev Ops Engineer - London, UK - https://smarkets.com/job/99823479-fd3a-4720-8090-455394fb63f...
Senior Cloud Infrastructure Engineer - London, UK - https://smarkets.com/job/7ee3a731-acc0-448f-bc61-64429e2ebf9...
QA Analyst - Contractor, Sweden - https://smarkets.com/job/52aad884-0aab-477e-a99c-8a76f38f42a...
QA Analyst - Contractor, Indiana, US - https://smarkets.com/job/494945c5-a687-4ffd-b117-d2f7a1074a8...
Data Engineer - London, UK - https://smarkets.com/job/3499be76-c66b-49eb-b6b8-c2d24fee622...
Founder's R&D Engineer - London, UK - https://smarkets.com/job/a42cba2e-e0e7-42e7-b156-3e56b485435...
We are a technology company developing groundbreaking solutions that help companies to rapidly transition from being passive electricity consumers to becoming fully self-sustaining prosumers, capable of leveraging various renewable energy assets.
We are currently looking for Rust and Python software developers to join us in Berlin.
Our homepage: https://www.frequenz.com
Apply here for Rust: https://www.frequenz.com/jobs/senior-rust-engineer and here for Python: https://www.frequenz.com/careers/senior-python-developer
Feel free to attach links to your code examples from github, gitlab, or the like to your application.
These roles are not fully-remote. These are based in Berlin, with a possibility for hybrid-model, which can be discussed during the course of the interview.
(PS: If you choose to apply, we would appreciate if you could mention that you have come from HN :) )
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.
We're looking for Python Software Engineers in multiple teams. More details about our jobs here: https://jobs.channable.com/?jobs-035754a9%5Btab%5D=Engineeri...
Our stack includes: Python, Haskell, Rust, PostgreSQL, Redis, Nix, Terraform, Nomad, Ansible
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.