We secure the SaaS apps—Microsoft 365, Salesforce, and hundreds more—where modern business happens, blocking breaches *in real time*.
Why Obsidian?
- Founded 2017; backed by Greylock, Norwest, IVP, and others, now scaling toward IPO. - Trusted by Snowflake, T-Mobile, Pure Storage & 200+ enterprises on five continents. - Momentum: $90 M Series C, new AI-driven defenses, expanding partner ecosystem. Senior Threat Backend EngineerOwn the APIs, event pipelines, and extension logic that power our browser-native security product. Ship to prod the day you merge.
You will:
- Build & refine threat detections with our security research team. - Stream and enrich event data through Kafka → Postgres/Elasticsearch. - Extend our Chromium-based browser extension (WXT). - Add new SaaS services to the platform; optimize data stores for scale. Stack highlights: - Python + FastAPI / asyncio - TypeScript + WXT - Rust micro-services - Kafka - Docker/K8s - Postgres & Elasticsearch You bring: - 4–6 yrs software engineering (cyber-security a plus). - Deep Python async skills; Kafka & K8s in production. - DB mastery (Postgres + Elastic). - Clear communication & bias toward ownership. Apply here: https://grnh.se/a646066d8usCategory Labs (formerly known as Monad Labs) is a team of systems engineers and researchers on a mission to design and build at the frontier of decentralized technology. We strive to design and build step-function improvements over existing blockchain solutions. After recently raising $225M in series A funding, led by Paradigm, we are growing our team.
Senior SWE (Rust, C/C++): https://jobs.ashbyhq.com/category-labs/45f674b2-d904-482e-a5...
Senior Security Engineer (distributed systems): https://jobs.ashbyhq.com/category-labs/0a054dfb-a748-4935-9d...
Smart Contract Engineer (Solidity. Nice to have: Rust, C++): https://jobs.ashbyhq.com/category-labs/776ce314-aa12-471b-92...
Senior Researcher, Systems: https://jobs.ashbyhq.com/category-labs/015934c5-66e5-4042-94...
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, ...)
- Engineering Team Lead [hands-on role] (structure, organize, help, elevate) - lead of team dealing with backend - low tail latencies, distributed systems, petascale
- Senior Data Engineer (datalake, ETL pipelines, MLOps...)
- DevSecOps Engineer (blue team - designing, implementing secure infrastructure)
- Product Manager (self driven, tech-enabled go-getter - expert on fraud and/or scaling a startup from product perspective)
- DevOps Engineer (IaaC in AWS)
We are also looking for other key roles:
- Chief Revenue Officer - be responsible for growth in US & EU
- Talent Hunter - looking for exceptional people (mostly engineering roles) - either people with experience (experts) or juniors with passion, drive and potential
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
Exoscale is a Swiss/European cloud service provider. We offer not only virtual machines but also storage (Object & Block), managed k8s and databases etc...
We're looking for multiple SWEs & SREs either in Switzerland or remotely across Europe!
Join a dynamic working environment with a cutting-edge distributed team. Exoscale strives to create an environment with great working conditions and welcomes diverse applicants.
My team in particular is looking for a SWE to work on Software Defined Network with Rust, ebpf & Go; but we have a lot of other job openings.
If interested, please apply at https://www.exoscale.com/jobs/
Freeform is deploying metal 3D printing factories at global scale and setting a new frontier in manufacturing. With AI, GPUs, and FPGAs working in tandem, our system monitors and corrects every microsecond of the process, delivering a level of precision, speed, and quality that’s never been possible—until now. This isn’t just an improvement; it’s a leap forward in how complex metal parts are made, with the ability to revolutionize industries like aerospace, defense, automotive, energy, and beyond. We are backed by top VCs including NVIDIA’s NVentures, Founders Fund, and Threshold Ventures.
It’s a small, tight-knit team and you’d have the opportunity to own significant and impactful greenfield projects throughout the entire development lifecycle and much more. Our software team comes from the likes of Google, SpaceX, and Apple, and believe in taking a first principles approach to solving hard problems.
A glimpse into our software landscape - https://youtu.be/nFWQArUkd5I?si=mP17qdKbxvf8qpZN
Our feature in TechCrunch! https://techcrunch.com/2024/10/22/ex-spacex-engineers-land-1...
+ Senior Software Engineer (C++) - https://grnh.se/9298ptmj3us
+ Senior Software Engineer (Rust) - https://grnh.se/q8fhgbio3us
+ Software Engineer (C++) - https://grnh.se/2rbwmodo3us
+ Software Engineer (Rust) - https://grnh.se/snc1e9ai3us
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.
We’re a small, high-trust team with deep experience in distributed systems, stream processing, and data tooling — and we’re growing.
We’re hiring for:
Senior Backend Engineer (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.
Backend Engineer (Integrations) – 2–4 years of backend experience. Help expand and maintain our catalog of real-time data connectors using Python. You’ll work closely with experienced engineers to build and optimize integrations with third-party systems, while deepening your skills in infrastructure and stream processing.
What we’re looking for:
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:
Lead Software Engineer - Backend, Distributed Systems, Rust - https://smarkets.com/job/41fba25f-0896-46d5-a093-8ebbc9e1624...
Senior Software Engineer - Backend, Rust, Python - https://smarkets.com/job/b8ef2330-b024-4f29-b55d-3269e1df76e...
Software Engineer - Backend, Python, Rust - https://smarkets.com/job/aaaf901f-77c0-4b35-9240-ed4cfa668ba...
Senior Quantitative Developer - https://smarkets.com/job/5502cdbe-6246-47ec-890b-2f2817e3cf1...
At Polars we're building a fast distributed query engine for Polars DataFrames. Our mission is scale DataFrame processing and offer a modern verstatile API to process data fast and easy.
More Optimal provides a low-code environment specifically aimed at Operations Researchers who use our platform to solve the most difficult planning and optimization challenges in the world. For our R&D department we are looking for an engineer who is enthusiastic about working on a complex system, solving puzzles and loves complex programming challenges, to make More Optimal even more loved by our customers as well as implementation partners.
In our R&D team you will be able to work on a very diverse combination of problems depending on your preferences: frontend, backend, advanced algorithms and infrastructure. We are a fast-growing company where you can make a real impact quickly.
Tech stack: TS/JS (primarily), Java/Kotlin, Python, Go, Rust, GCP
For now, we're only considering candidates who already have a connection to the Netherlands (e.g., those who have worked, studied, or lived here previously). Feel free to contact me directly (timo@moreoptimal.com) if you have any questions about the job opening.
We're looking for a backend-leaning fullstack dev. You will be one of the first engineers outside of the founding team. Here is a bit more about us: We're a seed stage AI startup backed by several top tier VCs. We're on a mission to ensure patients get the coverage they deserve from their health insurance.
We’re building deep, vertically integrated technology systems to solve fundamental problems in US healthcare - the biggest market in the world ($5T). We use AWS, K8s, React, and Rust but there is no requirement to have prior experience with them specifically. We'll teach you!
We are a founding team made up of ex-YC, Amazon, Meta, Microsoft, and Harvard Business School with previous successful exits. We have a 6+ month customer waitlist and growing insanely fast.
We're hiring our first engineer outside the founders. You'll work directly with customers to understand their needs, design the right solution, and build from zero to one. You'll own entire parts of the roadmap and tech stack while wearing multiple hats. Most important characteristics are resilience, work ethic, and curiosity. We care about slope, not where you are today.
This is an opportunity to work in an insanely fast paced, high ownership environment while solving real problems in healthcare.
We're happy to share more details on the role in person/on zoom. Please fill out this form if interested!
TensorZero is an open-source stack for industrial-grade LLM applications. It unifies an LLM gateway, observability, optimization, evaluation, and experimentation.
Open Roles:
‣ Back-end Engineering (Rust)
‣ Design Engineering
‣ Developer Relations (DevRel) Engineering
‣ Front-end Engineering (React)
‣ Product Engineering (Full-Stack)
What we offer:
‣ Vast majority of your work → open source
‣ Years of runway
‣ Small and entirely technical team: former Rust compiler maintainer, ML researchers (Stanford, CMU, Oxford, Columbia) with thousands of citations, decacorn CPO
‣ $200-300k base + up to 1% equity + benefits
‣ Onsite (5 days) in New York (Williamsburg, Brooklyn)
More information: https://tensorzero.com/candidate-brief
Continue is building an open-source AI code assistant along with a hub of models, rules, and tools. Our VS Code and JetBrains extensions are primarily written in TypeScript, but we write small amounts of Kotlin (for JetBrains), Rust (for performant codebase indexing), and Go (for easy distribution of a CLI).
We're hiring for junior, mid-level, and senior full-stack software engineers.
You can find the openings and apply here: https://jobs.ashbyhq.com/continue
SerpApi is the leading API to scrape and parse search engine results. We deeply support Google, Google Maps, Google Images, Bing, Baidu, and a lot more.
Our current stack is Ruby, Rails, MongoDB, and React.JS. We are looking for more Junior and Senior FullStack Engineers.
We have an awesome work environment: We are a remote first company (before Covid!). We do continuous integration, continuous deployments, code reviews, code pairings, profit sharing, and most of communication is async via GitHub.
We value super strongly transparency, do open books, have a public roadmap, and contribute to the EFF.
Apply at: https://serpapi.com/careers
Foxglove is the leading observability stack for robotics and physical AI. We accelerate robotics developers with logging, data management, and multimodal visualization. We're well funded (Series A, ~35 people) and assembling the most talented team in the industry to build a platform for all robots. Sound interesting? Join us!
** San Francisco, CA **
- ML / Robotics Engineer, Dev Relations (python, c++, rust, ros, lerobot, etc)
- Staff Frontend Engineer (typescript, rust, webgl, wasm)
** Remote / other locations (Seattle, London) **
- Forward Deployed Engineer (typescript, python, plus ideally some c++ or rust experience)
Music for health and wellbeing - we're working with leading scientists at MIT, NYU and UPenn alongside a roster of composers to create validated music to improve health and wellbeing.
We are on course to enhance the effectiveness & efficacy of our music through the use of ML. We've started with hospitality as a launchpad and are now moving into healthcare markets.
Core Stack: TypeScript, Rust (for low-level audio work), React, PostgreSQL, WebSockets, GCP
If you are enjoy ownership, autonomy, design patterns and are a pragmatic generalist then you will enjoy it here.
Hiring Founding Software Engineers in London, UK, - contact me via email: will [at] myndstream.com
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.
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.
Our stack includes: Python, Haskell, Rust, PostgreSQL, Redis, Nix, Terraform, Nomad, Ansible
We're looking for a Python Software Engineer to join us: https://jobs.channable.com/o/python-software-engineer-insigh...
work [at] yeet.cx
You can visit us at https://yeet.cx/
Or try our interactive sandbox at https://yeet.cx/play
Artis is a rapidly growing fintech company building innovative financial products focused on fast-moving market data. We provide powerful grid-based data displays (AG Grid) and real-time candlestick charting (TradingView Lightweight Charts) to our expanding user base.
We’re looking for a Lead Front-end Developer who: - Is an expert in React and TypeScript. - Has strong knowledge of Web Workers and performance optimization. - Can effectively lead and mentor a growing front-end team.
Bonus points for experience with: - WebAssembly (WASM) - Rust - Real-time/multiplayer applications - Working with financial data and financial products
You’ll thrive if you: - Enjoy solving challenging performance and scalability problems. - Prefer minimal bureaucracy and straightforward collaboration tools (Linear, Slack). - Are comfortable working remotely within UK working hours. (London-based is a plus, not mandatory.)
Salary: £100,000 – £120,000 per year. Apply directly at: careers@artis.works
We recently announced $14.4 million in funding to make blockchains & digital assets useful for the world. Founded by Jump Crypto alumni and core contributors to the Solana protocol and the Firedancer client (https://github.com/firedancer-io/firedancer), we’re tackling fundamental scalability, performance, and usability challenges in distributed ledgers. Our runtime conforms to the RISC-V specification—moving away from domain-specific VMs, DSLs, and bespoke compiler toolchains that limit developer and institutional adoption. Components are developed in C for maximal control over performance and resource usage.
Interesting problems you’ll tackle:
- Building and testing high-performance subsystems in C (cryptographic routines, consensus primitives, networking protocols)
- Designing robust process isolation on modern CPU architectures and tile-based multi-core layouts
- Optimizing memory hierarchies, cache utilization, and low-level I/O for commodity servers
You:
- 5+ years of systems programming in C/C++, Rust, or similar
- Deep expertise in CPU microarchitecture, memory subsystems, and low-level performance tuning
- Strong understanding of distributed systems design and consensus protocols
- Experience with high-performance networking and protocol design in real-time environments
Apply: https://jobs.ashbyhq.com/unto-labs/13df6bea-b253-4c80-ae05-5...
We’re creating robots that autonomously construct buildings. We design all of our hardware and software in-house in central Amsterdam, starting with autonomous bricklaying robots.
Building a robot like this means solving all sorts of interesting challenges: figuring out the robot's position with sub-mm precision; navigating autonomously around the building site; automating measurement and calibration of new robots; lots of distributed systems and so on.
Our robots are now continuously deployed on customer sites and we are earning real money as a masonry contractor. The full team is more than 60 people and we're growing rapidly to meet demand.
Our stack is mostly: Rust, TypeScript, Python, NixOS.
Some open roles:
- Software Engineer, Full Stack
- Software Engineer, Controls
- Software Engineer, Machine Vision
- Assembly/manufacturing technicians and robot operators
https://www.monumental.co/jobs
P.S. When we say full stack, we really mean it. Bolting things together, mixing mortar, embedded firmware, (software) build systems, React components and everything in between. Happy to answer questions.
OneSignal is building the best platform for businesses to intelligently engage with customers across every channel. We provide a simple interface to push notifications, email, and in-app messages, letting content creators focus on quality user engagement instead of complex implementation.
We're hiring Senior Software Engineers for our Product, SDK, and Backend teams.
More information and apply at https://onesignal.com/careers
At AllSpice, we're building the future of hardware development and collaboration, applying modern software design principles to the hardware industry with design review, automated test, and Gen AI (think GitHub/Bitbucket for hardware). AllSpice is unlocking the next generation of smart vehicles, IOT devices, rockets, medical devices, robotics, and much more.
Read more about our latest Series A announcement in TechCrunch (https://techcrunch.com/2025/06/23/allspices-platform-is-the-...)!
We have a highly capable, tight-knit, remote-first team with a flex office in Somerville, MA and SF. We strongly value continuous communication and personal development. See more on our careers page https://allspice.io/careers
We’re hiring primarily for:
Principal/Lead Software Engineer - You'll lead our product management platform architecture (Vue, TS, Golang, Playwright), and work with open-source projects to extend our user experience. https://allspice.io/post/jobs/principal-lead-fullstack-engin...
Sr./Principal Product Manager - You'll lead our core product platform user experience, with new ECAD file integrations, collaboration features, and improved onboarding experience for git. You should have some experience in the hardware design process and git. https://allspice.io/post/jobs/sr-technical-product-manager
Sr./Principal Technical Product Manager (Actions) - You're a hardware nerd who's been frustrated with the lack of automation and data access in electronics design. You're thrilled at the prospect of running wild with full access to circuits data to build extensible plugins to automate design validation, generate exports, run simulations, and connect to external data APIs. https://allspice.io/post/jobs/sr-technical-product-manager-a...
Sr./Principal Technical Product Manager (AI) - You've been an early adopter, introducing AI features in your past products. You understand how to tame large amounts of data for use in RAG to get consistent, functional output from LLMs, and you're not afraid to talk tensors. https://allspice.io/post/jobs/sr-technical-product-manager-a...
Mid+ SW Parsing and datastructures (rust) - systems programming experience required. You'll be responsible for helping develop our ECAD schema and convert between file formats efficiently. This role can flex to be pretty senior if you have more experience than is listed. https://allspice.io/post/jobs/software-engineer-parsing-and-...
Tech Stack: Docker, Terraform, GoLang, Rust, Python, Vue, Javascript
Apply by emailing us at jobs<AT>allspice[dt]io (<AT> -> @, [dt] -> .) with [HN] in the title and a link to your GitHub/GitLab profile and/or resume for technical roles.
We are a vibrant technology company developing groundbreaking solutions that enable the rapid transition towards a world of decentralized energy. We’re helping 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 a Senior Rust Engineer to join one of our backend teams in Berlin.
Our homepage: https://www.frequenz.com/
Apply here: https://www.frequenz.com/jobs/senior-rust-engineer
(PS: If you choose to apply, we would appreciate if you could mention that you have come from HN :) )
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.
1. Product Designer - https://zed.dev/jobs/product-designer
2. Distributed Systems Rust Engineer - https://zed.dev/jobs/backend-engineer
3. Rust Engineer - https://zed.dev/jobs/rust-engineer
4. AI Rust Engineer - https://zed.dev/jobs/ai-engineer
5. Frontend Engineer - https://zed.dev/jobs/frontend-engineer
We’re on a mission to help make cities easier to navigate. Our award-winning app helps millions of people around the world. We have a number of roles open, including the following:
Engineering Manager (London): https://job-boards.greenhouse.io/via/jobs/8001882002
Director of Product Design (London): https://job-boards.greenhouse.io/via/jobs/7935949002
Senior Product Manager (London): https://job-boards.greenhouse.io/via/jobs/7941162002
Transit Data Team Lead (New York): https://job-boards.greenhouse.io/via/jobs/7741053002
Backend tech stack includes: AWS, Python, some C++, some Rust, EKS, Terraform.
We are building a truly private, open-source LLM gateway with outstanding user experience to address privacy problems around using LLMs. When we interact with AI-based services, we face the fundamental tension between utility and privacy. Current solutions to this problem are inadequate, so we are ready to build what we couldn't find.
Who are we? A well-funded, bootstrapped venture by the founders of IVPN - a VPN service highly regarded by privacy advocates and analysts, in operation since 2009.
We are looking for a Founding Engineer (based in Europe) to architect and build an MVP from the ground up. This is a role for a senior builder with:
- At least 8 years of professional experience
- Demonstrable history of solo-shipping products
- Deep expertise across the stack (e.g., Go/Rust for backend, React/Vue for frontend)
- Strong security and infrastructure automation mindset
What you can expect:
- Small, 100% remote team that prefers pragmatism and maximum autonomy.
- Complete technical ownership, responsible for building a system designed for high availability and verifiable privacy.
- Sole focus on engineering - zero distractions. The founders handle product, strategy, design, communications, legal and all other business related matters.
- Strong salary and a significant, foundational equity stake (up to 4%).
If you're a self-directed, experienced engineer who wants to build the foundational infrastructure for private, trustworthy AI access, email me at viktor at ivpn.net for a one-page project brief.