Founded in 2018, ESG Book is a global leader in sustainability data and technology. We are a fast-paced, exciting young company that combines cutting-edge technology and proprietary research. We pride ourselves on our entrepreneurial spirit, and dynamic work environment.
ESG Book went through a successful series B funding round in 2022 and will now continue to advance ESG Book’s next-generation technology capabilities, enabling clients to meet increasingly complex sustainability requirements, and accelerate the company’s expansion as it responds to growing demand for technology enabled ESG data solutions.
Software Engineer: https://apply.workable.com/esg-book/j/D0A2BB66CD/
Apply on workable, or preferably email me directly. Feel free to drop any questions you may have also: miles.croxford@esgbook.com
If you've never considered working in supply chains before, everything around you, including the device you're reading this on, has a story of how it got there. From raw materials to the final product in your hands, that story is its supply chain.
If you're the kind of engineer who thrives on solving novel challenges, such as building modern data pipelines to construct a supply chain from unstructured communication streams, Ameba offers you the opportunity to build from first principles in a greenfield space.
We're a seed startup made up of experienced entrepreneurs (who have previously raised $160m+, built supply chains for 30+ brands) and builders (formerly at Meta, Microsoft, Snap, Apple & Palantir). We have big ambitions and are backed by the best investors in Europe, having raised over $9m since our launch just over a year ago — and we're just getting started.
If you're interested, please apply here: https://jobs.ashbyhq.com/ameba
(Note we are currently unable to sponsor visas)
We're combining LLMs and transpilers to translate COBOL into Java. If you’re a Rust developer with experience working with compilers or transpilers, this role could be a great fit. Come and build a system that helps the largest companies modernise their legacy codebases.
Please email join [at] bloop [dot] ai with "HN Compiler Engineer" in the subject line.
More details - https://www.ycombinator.com/companies/bloop/jobs
We’re building an AI-powered clinic assistant that actually gets things done—booking appointments, managing vaccine records, handling FAQs, and even sounding like the clinic itself. This is multi-modal AI in the real world, not a demo.
We’re looking for product-minded engineers who want to push the boundaries of generative AI, RAG, and intelligent automation. You’ll ship fast, solve real user problems, and help us make AI feel magical, not clunky.
Tech stack: TypeScript, NestJS, React, React Native, AWS, Figma. Bonus: AI experience, but what matters most is product intuition and the drive to build useful things.
PetsApp is redefining pet care in a hybrid physical-digital world. Join us and work on AI that directly impacts clinics, pet owners, and their pets—every day.
Apply here: https://forms.gle/5fww8HDwRrP6c6Fo9
We’re looking for engineers who prioritise real world impact, and use technology as a solution. We prefer personal projects or relevant hobbies, not hard leetcode questions. We’re looking for mission-driven engineers. People who see problems in the world and want to help solve them.
You’d be working with me to build low latency, multi-drone, modern mission planning, flight monitoring and control software for drones. Other applications include tools for drone design and manufacturing. For my project, we use React, Tailwind, Node, drizzle-orm, Postgres, SQLite, deck.gl, Python, FastAPI, asyncio, and more.
If interested, email my temporary email: hn-apr25@mail.orth.uk. Temporary only because of spam emails (not related to hiring).
My personal website, if you want to know who you would work with: tlduck.com and https://stackoverflow.com/users/7365866/ben-butterworth
We’re ko-br—a London-based robotics AI startup automating variable warehouse operations (palletizing, kitting) with AI-powered robots that handle real-world chaos (grip slips, conveyor jams, dust storms). Our no-code solution plugs into ABB/KUKA/UR arms, saving clients 85% on emergency calls.
The Rebellion:
We’re fighting the “3AM cobot meltdown” industrial hangover. Our robots learn from humans, adapt to chaos, and recover autonomously—no coding, no all-nighters.
Our manifesto: https://ko-br.com/manifesto
The Role:
As CCO, you’ll co-lead our commercial strategy, build partnerships (ABB, KUKA), and scale revenue. This is a co-founder role with significant equity.
You:
- Built sales engines in robotics/AI/industrial tech
- Have logistics/manufacturing contacts
- Thrive in early-stage chaos
- Want to turn warehouse workers into robot mentors
Why Join?
- Founder: Ex-Amazon/Meta ML engineer, expertise in ML infrastructure, computer vision, distributed systems, and building Internet-scale ML pipelines.
- Team: 40+ years combined expertise in VR, ML, robotics, MLOps, data annotation and cybersecurity
Apply: Email hiring@ko-br.com with “CCO Rebellion” in subject. Let’s automate drudgery, not creativity.
No recruiters. Let’s build robots that respect humans.
Coder is an open-source, remote-first software company with offices in Austin, San Francisco, and London. Our CDE moves development from local machines to cloud infrastructure, reducing onboarding time while speeding up builds, tests, and workspace configuration for individuals and large dev teams. The developers that we support work at companies like Discord, Dropbox, and Palantir.
[1] Senior Software Engineer, back-end Go (US/Canada, Remote)
[2] Software Engineer, back-end Go (Poland, Remote)
[3] Security Engineer, web app security (US/Canada/Poland, Remote)
[4] Senior Product Marketing Manager (US/Canada, Remote)
[5] Part-time Software Engineer, TypeScript heavy (US/Canada, Remote)
Careers page w/ more information + salary bands: https://coder.com/careers?utm_source=O2n5Ew72WD
I support all recruiting for our global team, you can reach me directly with any questions at connor.brim@coder.com.
Quench.ai connects to internal tools, enabling teams to search, chat, and retrieve precise answers from organizational knowledge - and to automate tasks with AI. Team of 15 based out of London AI Hub. Founded by Husayn Kassai - former CEO and Co-Founder of AI unicorn Onfido. Pre-seed of $5M raised from 8 funds including Tuesday VC (formerly Crunchbase), Firstminute Capital, Sequoia Scout Fund, Northzone Scout, and over sixty founders.
We're hiring for:
- Team Lead (Tech Lead Manager) to lead our core engineering team responsible for frontend, backend and infra
- Location: London, On-Site Hybrid (3 days a week) - Link: https://www.quench.ai/job/team-lead-software-engineering - E-mail: talent-eng@quench.ai - Tech Lead Applied AI engineer to work on developing and improving our RAG and agentic AI technology - Location: London, On-Site Hybrid (3 days a week) - E-mail: talent-eng@quench.ai (pls reach out via e-mail, job not yet out in careers site) Tech Stack: Frontend: Typescript, React, Next.js, Backend: Python, Postgres, Pinecone, RedisWe are a proprietary trading firm operating in conventional as well as cutting-edge alternative markets. Our strategies run 24/7 without manual intervention powered by low-latency infrastructure and the latest machine learning techniques. We're a meritocratic and lean team of highly-motivated scientists and developers and as such value technical ability more than politics: what matters is how good your code is, not how well you sell yourself. We spend no time dealing with clients, customers or investors and instead focus on growing our business by building better technology.
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If you are a talented developer who likes to work on low latency systems please get in touch. We are also happy to sponsor exceptional talent.
You will be part of a small but growing development team that shares the responsibility of the whole trading stack. As you own the code, deployment and all tooling, you can rapidly and safely iterate on changes to the trading software. As a result we deploy many times a day.
Developers collaborate directly with traders and researchers, allowing for immediate reaction to market changes and fast iteration of live trading engines
Send us a message at:
contact@queueco.com
or apply directly at:
We’re seeking engineers who want to build real-world AI tools that address industry challenges—working with data from large-scale infrastructure to ML-powered document intelligence.
Tech Stack: JavaScript | Next.js | Node.js | TypeScript | Azure
Open Roles: • Full-Stack Engineer (Hybrid, London) • (x2) Back End Engineer (Hybrid, London) • AI Product Manager (Hybrid, London)
Interested in applying AI to built-world challenges? Email jobs at voltquant dot com with your CV and two examples of projects you’re most proud of.
What we do: V7 Go: Automate workflows with AI agents. V7 Darwin: Label data at scale to build custom AI
We're looking for FS, FE and BE Engineers, AI Solution Engineers and AI Product Engineers as a priority. Also various GTM roles live!
Please apply via our website and mention HN during your application!
RevEng.AI is building foundational AI models to identify malicious threats and security vulnerabilities inside software at the binary level. 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 a team of Frontend, Backend, and Full Stack Engineers. Our tech stack currently uses react, fastapi, redis, celery, rabbitmq, and k8s.
* 5+ years of experience * 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 * Prior experience working with vector databases or complex data
To apply or learn more, email contact[at]reveng.ai with "hn" in the subject line.
Hiya makes your mobile calling experience smarter and more relevant. We partner with phone makers and telecom carriers to bring this innovation to over 500+ million global subscribers and growing.
https://www.hiya.com/company/about
Our current open positions include:
* Full Stack Software Engineer (London): https://jobs.ashbyhq.com/hiya/1a80d0ff-b62a-4130-80b3-a82a6f...
* AI Engineer (Seattle): https://jobs.ashbyhq.com/hiya/5cb65a2c-7e3a-4323-9af0-6180e6...
* SDET (Seattle): https://jobs.ashbyhq.com/hiya/ddb4bfda-df4c-499c-a90b-345d96...
* Senior SDE III (Budapest): https://jobs.ashbyhq.com/hiya/aaea75d5-4893-4f34-a1a6-89c95e...
* Cloud Platform Engineer (Budapest): https://jobs.ashbyhq.com/hiya/5d4f98d4-7a57-45d6-b890-088d98...
* Junior Backend Engineer, Enterprise Success (Budapest): https://jobs.ashbyhq.com/hiya/f4d00c57-9e83-4856-8055-41979c...
At Purple Dot, we are on a mission to create a world where, ultimately, every product that is manufactured is sold. The current e-commerce model leaves brands waiting for stock to arrive at the warehouse before they can start selling, leading to missed sales opportunities, unsold inventory and waste. We believe the next wave of innovation will happen in the time before stock arrives, enabling brands to sell inventory no matter where it is in the world. Our pre-commerce platform puts the power back in brands’ hands, allowing them to take control of their sales timelines and maximise revenue potential.
And we make pre-orders trust worthy for the shoppers too, keeping their money in escrow until items ship, and always up to date on where their pre-order is at, with an option to cancel no questions asked.
We've raised a $10m Series A in 2024, we've plenty of runway left and we're looking for help as we scale our platform through the next order of magnitude in terms of load on the system and ultimately the number of dollars we process.
We are a team of 22 split evenly between the UK and US. 32% female, including the CEO. All of us have a mix of startup and big tech experience. For the founding team this is our second (so far :) successful startup.
I have two engineering role open:
* senior full stack engineer - based in London, UK - to join our core engineering team of 6 that are shipping our product roadmap: https://purpledot.notion.site/senior-full-stack-engineer-uk EDIT: WE'VE MADE THIS HIRE NOW
* customer solutions engineer - based in New York, US - to work with our support and sales teams to help make going live with and using Purple Dot a delightful experience for brands and their shoppers: https://purpledot.notion.site/customer-solutions-engineer-us... EDIT: WE'VE MADE THIS HIRE NOW
Like everything else we do, we interview fast, and you will deal with me (head of engineering) throughout.
Kaedim is an AI startup building ML algorithms that turn images into digital 3d models. We are a group of ~10 looking to grow the team to help streamline 3d content creation for 3d artists and are already working with 1 of the top 10 games of all time! Using our AI and in-house art team, we have the most accurate, game-ready 2d → 3d asset generation pipeline. Currently, we are offering a 10x speed up to 3D asset creation pipelines of 200+ game developers and we are working with partners like Voodoo, Upland, Azra Games.
Check out our demo here: https://www.youtube.com/watch?v=tlQWFG1DLb0
Job descriptions and application link: https://join-kaedim.notion.site/
Tech Stack:
Product (web app, API): React, MySQL, NodeJS, Python, AWS
Machine Learning: Python, PyTorch, AWS
Bloomberg is hiring experienced software engineers to build high-performance infrastructure that powers real-time financial data for global markets. We process massive datasets from regulatory agencies, exchanges, central banks, and financial institutions—fueling Bloomberg products and AI-driven insights. Our work directly impacts traders, analysts, and decision-makers worldwide. We tackle hard distributed systems problems at scale, from low-latency data processing to cloud/hybrid computing, leveraging cutting-edge open-source & proprietary technologies.
I joined Bloomberg in 2020 via its acquisition of Second Measure (YC S15) and stayed because of the challenging problems and the freedom to solve them. Bloomberg values deep technical expertise and gives engineers real ownership over impactful projects.
We're hiring for roles in these locations with 3-days in office most weeks:
Princeton/New York: https://bloomberg.avature.net/careers/JobDetail/Senior-Softw...
Iterum is a seed-stage startup revolutionising appliance management for scaled residential properties. Our platform, Iterum IQ, is addressing a critical but overlooked challenge in property management: the inefficient handling of home appliances and consequential lack of actionable data. These things together lead to significant costs, wasted time, and increased carbon emissions. Our mission is to streamline appliance procurement and management, delivering substantial cost savings for property operators and investors, enhancing resident experiences, and reducing carbon footprints at scale.
We’re looking for a talented and ambitious mid level (at least 3-5 years experience) full stack developer to join as our Engineering Lead. You’d work with me - the (fractional) CTO - as well as the (full time) Head of Product and the rest of the team to get Iterum IQ from MVP to scale.
Our tech stack is Django with SSR, PostgreSQL, Bootstrap, HTMX, and a couple of other tools and services. You should be familiar with Django and strong on the backend side, at least competent on the (web) frontend side and with (cloud, at this point) infrastructure management. We’re a small team, so you’d work on pretty much everything.
You’d need to already be based in or near London. The job is onsite, though hybrid is fine.
If you’re interested, please apply here: https://uk.indeed.com/job/engineering-lead-e99f1366ca04fc52
We do what we can to ensure our process is swift and respectful of your time.
Company: we are an early-stage startup in London making an analytical in-memory graph database engine in C++ strongly focused on speed with a for life science industry and beyond
Experience: good to excellent knowledge of C++, systems programming, programming for high performance and computer science. Technologies: C++20, CMake, git, Linux.
Please apply if you like C++ a lot, if you are good at creative software design, if you like to design new algorithms and to find new arcane ways to make software fast.
Apply online at https://form.typeform.com/to/U9oAwal6
Dirac is building the next Walmart-sized retail company over 10+ years. We sell d2c and are doing £300k-£500k monthly sales (lots of toys and reasonably seasonal). I built most the initial systems which run the company’s backend (purchasing, databases, pipelines etc.) but we will need something (and someone!) better to reach £1bn+ sales over the next four years
We need to go from a bunch of bash scripts coordinated by systemd, adhoc estimators and pipelines to a more coherent machine for demand estimation, matching products, warehousing and purchasing.
You’ll be mostly writing code (django+postgre+a hetzner server) but also helping our two more junior devs.
The vision for the company is twofold: (1) find 1000s of suppliers and wholesalers worldwide and (2) to ingest all their pricing, logistics and then move stock to where prices and demand is highest.
Visa sponsorship possible.
Investors include will thorndike, charlie songhurst, patio11, backedvc and some others!
email ethan [at] dirac [dot] software if interested!
We work on industrial/grid-scale batteries and other renewable generation: monitoring, managing and trading them on multiple energy markets. Batteries like these: https://en.wikipedia.org/wiki/Battery_energy_storage_system Everyone starting from the C-suite is passionate about addressing climate change and transitioning to renewable energy!
We're a small team of 7 backend engineers atm (other teams have Ops, FE and DS roles). We have paying customers and have been around for 10 years. Our current goal is to make the platform more scalable to deal with the customer growth and move to new markets. The biggest challenge is understanding how the various energy markets and energy storage in general work and then translating that to reliable working software.
We're currently looking for a Senior Backend Engineer (Go). Our office is in London Blackfriars and most engineers come in about 2 days a week, but this is flexible.
Feel free to message me with any questions or apply directly:
If you haven't heard of us before, we’re a quantitative trading firm that cares a lot about technology. This means building elegant solutions that scale well, never assuming that “best in market” is the same as “best possible,” and ensuring everybody has the resources needed to do their jobs well.
We're looking for folks in New York, London, Hong Kong, and Singapore for a variety of roles including, but not limited to:
- Data Engineers who can help us understand, clean, manage and share the data that guides our trading. At Jane Street, having a thorough and accurate understanding of data is at the core of everything we do -- https://www.janestreet.com/join-jane-street/position/6558007...
- Network Engineers to help our Network Security team run, scale, and continuously improve our infrastructure through hands-on operations, testing, and automation -- https://www.janestreet.com/join-jane-street/position/6230456...
- Machine Learning Engineers with robust experience in machine learning and strong mathematical foundations. Machine learning is a critical pillar of Jane Street's global business. Our ever-evolving trading environment serves as a unique, rapid-feedback platform for ML experimentation, allowing us to incorporate new ideas with relatively little friction -- https://www.janestreet.com/join-jane-street/position/6485460...
- Machine Learning Performance Engineers with experience in low-level systems programming to help optimize the performance of our models - both training and inference -- https://www.janestreet.com/join-jane-street/position/7449077...
- Software Engineers who are intimately tied into every area of our business. We are big believers in functional programming, using OCaml, a statically-typed functional programming language, as our primary development language. We also believe in the value of open source software, using it in our daily work and releasing hundreds of thousands of lines of our own code as open source -- https://www.janestreet.com/join-jane-street/position/4274288...
We’re a quantitative trading firm based in NYC that trades hundreds of millions of shares each day on over 200 markets worldwide. We use math and technology in everything we do; our talented developers, engineers, and programmers build complex models and systems that allow us to make automated trading decisions on global markets.
We’re hiring for:
Senior Systems Engineer | NYC, Boulder, London, Dublin | https://www.hudsonrivertrading.com/careers/?q=senior+systems...
Software Engineer – Treasury Infrastructure | NYC, ATX, Chicago, London | https://www.hudsonrivertrading.com/careers/?q=software+engin...
Windows Engineer | Singapore | https://www.hudsonrivertrading.com/careers/job/?gh_jid=65338...
TradeOps Analyst | Singapore | https://www.hudsonrivertrading.com/careers/job/?gh_jid=64468...
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 30 to 70 over the last two years.
Full-Stack & Devops 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
At Gigs, we're building the operating system for mobile services - a platform that enables tech companies to seamlessly embed connectivity into their products. We've recently raised a substantial Series B and are looking for exceptional candidates across a wide range of roles:
- Senior Full Stack Engineer - Senior Backend Engineer - Corporate Security Engineer - Solutions Engineer - Product Manager, Fintech
To review all open roles and benefits, go visit our career page https://gigs.com/careers
Questions? reach out to thibaut@gigs.com
Granola is an AI notepad for people in back-to-back meetings. Our macOS app takes your meeting notes and combines them with a transcript to get an awesome meeting summary. And increasingly, Granola is a new kind of knowledge-base.
We're 15 people working in lovely Shoreditch office. See our approach to early-stage product development: https://www.granola.ai/blog/how-to-evolve-a-product
Stack: TypeScript, React, Electron, AWS, various LLM tech.
We recently raised $20M and we're growing quickly. We're funded by Spark Capital, with participation from investors AI Grant, Lightspeed, Betaworks, Firstminute Capital, and others.
Open roles:
- Product Engineers (Backend & Frontend) - iOS Engineer - Windows Engineer (contract) - AI Engineer - Founding Designer
Competitive compensation with above-market equity.
See https://granola.ai/jobs or email hiring@granola.so.
Polaron is an Imperial College London spinout using generative AI to bridge the gap between process (how materials are made) and performance (how materials behave). We’re building a platform that enables materials designers to use these state-of-the-art AI techniques in their day-to-day work. We’re a small, well-funded team, and have just won the UK Government’s inaugural Manchester Prize [2] for AI innovation and public good.
As a Software Engineer at Polaron, projects on our roadmap you could work on include: - Scaling our canvas-based frontend to handle images with greater than 10k x 10k pixel resolution. - Intelligently autoscaling our GPU cluster in response to customer demand. - Building a public-facing API, in addition to our web-based interface.
As a Machine Learning Engineer at Polaron, projects on our roadmap you could work on include: - Optimising efficiency and robustness of our existing algorithms for material characterisation, exploration and optimisation; - Adapting cutting edge machine learning methods for material science applications.
Tech Stack: TypeScript (React / Next.js / Express / Prisma), Python (PyTorch), PostgreSQL, Docker, Kubernetes, AWS, Terraform.
Apply via our jobs page: https://apply.workable.com/polaron.
If you’d like any more information, please reach out at: [careers@polaron.ai](mailto:careers@polaron.ai).
[1]: https://www.imperial.ac.uk/news/250657/ai-spinout-polaron-ac... [2]: https://www.gov.uk/government/news/british-start-up-wins-1-m...
We are looking for an experienced Bid Manager that can help us:
- identify relevant opportunities across a number of procurement portals
- produce high-quality competitive proposals
- coordinate with various teams in the company to develop technical and financial sections in full detail
and more! Full job description at https://reckondigital.com/careers/.
Reckon Digital is a London-based software company creating state-of-the-art business software solutions and providing consultancy in the areas of Artificial Intelligence, Optimisation, and Cyber Security.
A large part of our work is for international non-profit organisations and NGOs.
- More info on Reckon Digital: https://reckondigital.com/
- Full job description, including requirements, our technology stack, etc: https://reckondigital.com/careers/
Interested? Email us at jobs@reckondigital.com! Make sure you include an updated copy of your CV.
Tracebit is a Seed Stage, UK founded security product company taking a new look at canaries for intrusion detection.
We’re backed by Accel and we work with some amazing companies (Docker, Riot Games, Synthesia, Cresta, Oleria, Netacea) to help detect threats in cloud and enterprise.
We’ve hired 5/6 founding engineers - there is 1 space left in our plan for this year, could this be for you?
Founding Engineer | £70-100k + generous seed stage equity
Learn more and apply: https://tracebit.com/jobs/founding-engineer