Citymapper by Via | London, UK | Onsite or Hybrid (London, UK and New York, USA) | VISA

We are building the ultimate technology for mobility in cities. We are hiring

- Engineering Manager (London): https://job-boards.greenhouse.io/via/jobs/8001882002 - Director of Engineering (London): https://job-boards.greenhouse.io/via/jobs/8074378002

More roles at https://job-boards.greenhouse.io/via

Backend tech stack includes: AWS, Python, some C++, some Rust, EKS, Terraform.

Formal | Multiple Positions | REMOTE | Full-Time | $100k - $250k + Equity

At Formal [0], we’re rethinking serverless from scratch: we’re building a new computing stack for instant, globally available, truly elastic, soundly isolated execution. We leverage formal methods and languages to build OS interfaces with low overhead, formally verified isolation without containers or VMs. Our immediate goal is to write a new programming language to replace eBPF and build the world's first serverless networking infrastructure.

We are a 5-person, VC-funded team with PhDs from Stanford, UW, OSU, and Brown, advised by professors from MIT and UWaterloo. We are currently hiring for the following four positions:

- [1] Staff Software Engineer: Compilers, Programming Languages, and Verification (≥ $200k + ≥ 0.5%)

- [2] Formal Verification Engineer: Formal Methods and Programming Languages ($120k - $200k + ≥ 0.25%)

- [3] Software Engineer: Compilers and Programming Languages ($100k - $175k + ≥ 0.2%)

- [4] Formal Methods PhD Intern: Formal Methods and Programming Languages (≥ $5k / month)

Please see [5] for general information. To apply, email us at (work at formalstack dot com) and let us know how your experiences fit the role and its requirements.

[0]: https://formalstack.com [1]: https://formalstack.com/jobs/09-2025/staff-software-engineer... [2]: https://formalstack.com/jobs/09-2025/formal-verification-eng... [3]: https://formalstack.com/jobs/09-2025/software-engineer-v.pdf [4]: https://formalstack.com/jobs/09-2025/formal-methods-phd-inte... [5]: https://formalstack.com/jobs/09-2025/info.pdf

We're building the serverless platform that powers millions of developers at the edge. Looking for passionate engineers to shape the future of edge computing.

Engineering Manager, Workers Runtime - Lead our multi-language support (JS/TS, Node.js, Rust, Python). Drive technical vision while building an incredible team. https://rb.gy/kmjt2b

Principal VM Engineer, Workers Runtime - Optimize V8 usage and JS/WASM virtual machine capabilities. Push the boundaries of what's possible at the edge. https://rb.gy/00o7a4

Senior Software Engineer, Workers Runtime - Key contributor across our technical domains. Help us innovate and scale the platform powering the modern web. https://rb.gy/095923

We're at the heart of distributed systems, runtime optimization, and developer experience that impacts millions worldwide. Feel free to reach out directly or apply through the links.

Continua AI | https://continua.ai | Multiple Roles | ONSITE (NYC/Seattle) | Full-time | Salary + Equity

At Continua (http://continua.ai/), we're on our way to solving Social AI, and we're expanding our team! We've built an AI agent that users can invite into group conversations to make planning, coordination, and information retrieval effortless. We're social creatures and it just seemed to us a huge opportunity to bring AI into group settings. We've seen strong retention over the last few months and want you to help us bring our product to the next level. Try adding our agent at http://continua.ai/ to group chats and kick the tires!

I’m David (https://www.linkedin.com/in/dpetrou/), the founder and CEO. Before starting Continua, I was a Distinguished Software Engineer at Google. We’re backed by top-tier VCs and incredible angel investors. Our team is a fantastic bunch (http://continua.ai/team) of accomplished engineers and researchers from Google, Slack, Disney, and several AI startups. We're pretty clued in on the technology side and have a strong vision of how the transformative technology of the last few years along with our own secret sauce (not just a ChatGPT wrapper) can help a huge number of people.

We’re hiring a Senior/Staff Machine Learning Engineer: https://jobs.ashbyhq.com/continua/

You'll work on building and improving the best LLM group chat experience there is, including fine-tuning models to boost conversational quality and improve scalability and identifying novel ways to build a "memory" which leads to a personalized and unique experience for our users. You're an experienced machine learning engineer with broad knowledge and skills and have experience fine-tuning LLMs for both generative and discriminative use cases. You have a Master's or PhD in Machine Learning (or a Bachelor’s with exceptional industry experience). You understand what it means to work at a fast-moving startup.

Oh, and we maintain a vibrant blog, including items of technical interest, at http://blog.continua.ai/. Check it out! :)

David

MONUMENTAL | https://www.monumental.co/ | Amsterdam, The Netherlands | Full Time | Onsite

We make robots that autonomously construct buildings. We are currently developing and manufacturing our autonomous bricklaying system in the beautiful centre of Amsterdam. And our robots are already earning real revenue operating on construction sites all over the Netherlands.

We're looking for experienced FULL-STACK ENGINEERS who can help us solve problems like:

- Data sync and analytics queries across a fleet of robots (that can be offline for hours at a time)

- Rapid deployment and iteration of experimental software changes across firmware, control software and UI

- Modelling buildings in code and finding the right UI for operators to edit them

Check out the progress we've already made on Atrium, our operating system for robotics: https://www.monumental.co/atrium

We're rapidly scaling up operations and we need experienced, generalist engineers who can build the systems that manage all of that complexity. If you think that 'full-stack' could reasonably mean debugging firmware, mixing buckets of mortar _and_ writing React components, we are looking for you. Robotics experience not required!

https://www.monumental.co/jobs

Nebula | Multiple roles | Remote/Onsite NYC preferred | Full-time

Nebula is building a modular blockchain stack to make on-chain finance faster, fairer, and more efficient than off-chain. The stack has 3 parts:

1. Execution environment – combines Rust + Sovereign SDK for highly performant, expressive private apps (e.g. solving latency asymmetry in exchanges). 2. Privacy protocol – blends cryptography + privacy hardware for verifiable, fast programmable privacy. 3. Nebula Exchange – a hyper-performant exchange using batch auctions + private orders to eliminate latency asymmetry and guarantee best prices. We’re hiring ambitious engineers to join the core team:

- Frontend (React/TS/Next.js) – focus on architecture, design systems, interactivity, realtime apps, Figma → production.

- Backend (Rust/Go) – core infra + SDK integration.

Requirements: detail-obsessed, independent problem solver, thrives in chaos, good communicator, can work ET hours. Nice to have: exp. in financial exchanges, realtime data-heavy apps, web3. Note: workload can be intense (sometimes 80+ hrs/wk).

If this challenge excites you, send CV → Email is hidden

Cogram | Full-time | Remote (CET ±3) | https://cogram.com | B2B SaaS / AI for AEC

Cogram is a productivity platform for the architecture, engineering, and construction (AEC) industry. We automate core workflows including meeting notes, site reports, email management, project administration, and RFP bidding. We're backed by YC, Initialized, and other well-known Silicon Valley investors.

We're currently looking for exceptional engineers / designers:

- Senior Full-Stack Engineer (backend-heavy, Python; 8+ years). Expert Python, Terraform and CI/CD, experience with AWS/Azure, comfortable working in React/TypeScript when needed.

- Senior Full-Stack Engineer (frontend-heavy, UI/UX; 8+ years). Deep React/TypeScript expertise, strong sense for UI/UX, proven track record of shipping user-facing products, comfortable with backend when needed.

- Design Engineer (UI/UX & frontend; 5+ years). Strong portfolio required, Figma → React experience, experience covering the full design cycle.

Stack: Python (FastAPI), Postgres, Redis, React/TypeScript, React Native/Expo, Terraform on AWS & Azure. Benefits: Fully remote, three off-sites/year, ~38 paid days off, competitive salary + equity.

Apply: Email Email is hidden with links (GitHub / LinkedIn / portfolio [required for design engineer]) and a short note.

Synca | Stockholm (EU Remote ok) | Senior Frontend Engineer | Full-time | Salary + Equity

We're looking for a talented Frontend Engineer to help build the future of business intelligence.

Synca uses AI to determine who in an organization needs to know what, and allows them to take immediate action. With the flood of information in todays age, people don't know what they need to know. We fill this gap and empower everyone to be experts in their domain.

We raised funds from and landed a strategic partnership with a leading consultancy in Europe's AI capital and are looking for someone to join us in our journey to the next level.

Please apply at https://wellfound.com/l/2bafnx

We look forward to hearing from you!

https://www.synca.ai/

Faction | Founding Engineers | ONSITE (SF) - we sponsor visas | Full-Time | $130,000 - $225,000 + equity | https://www.usefaction.com/

Faction is building autonomous AI for industrial distributors and manufacturers. Our mission is to accelerate the $2T industrial commerce market, and enable physical infrastructure to move as fast as the digital economy.

We’re looking for Founding Engineers who want to build software that runs real businesses.

Who we are looking for:

- Strong experience with Next.js, TypeScript, Python (FastAPI), and PostgreSQL

- Deep knowledge of LLM research, agents, tool calling, and robustness

- Comfort with intensity and long hours in a small, fast-moving team (we operate 9-9-6)

- Ambition to shape our technical culture and roadmap as a core founding member

For more info: https://docs.usefaction.com/careers. Email Resumes/GitHub: Email is hidden

Class Central | Senior Full Stack Engineer | Remote | https://www.classcentral.com

I'm looking for a senior engineer to take ownership (from me) of Class Central's codebase and infrastructure.

We help tens of millions of learners find the best courses on any subject. Small team (6 people), profitable, independent, and around for 13+ years. No VC drama, just sustainable growth.

Stack: PHP 8+, Symfony 7+, MySQL, Elasticsearch, Google Cloud. We keep it simple and productive.

Own the full stack, help shape our product, and build pragmatic solutions for our current scale. I am looking for product-minded engineers who are focused on user experience and driven to understand the business.

I'm building a new cross-functional product team from scratch (engineering, product, design). Looking for a foundational engineer who can mentor, collaborate, and help define how we work together.

Remote-first, async, very few meetings. Real autonomy, real impact. Fair warning: being fully remote means no annual Halloween Heists.

While I don't have a formal job post up yet, if you're at that point where this feels like the right next step, I'd be happy to hear from you: Email is hidden