Bookarang | DevOps/Backend developer | Amsterdam, The Netherlands | € 55-72k | Fulltime, Onsite

Bookarang (part of NBD Biblion) is using AI to build tomorrow's book recommendation technology. Book retailers and libraries use our technology to provide their readers with truly relevant and personal recommendations — not on the basis of popularity or other people’s behaviour, but by using the book’s content and the reader’s personal preferences as a starting point.

As a DevOps/backend developer, you'll ensure our technology runs smoothly across test and production environments, from in-house R&D servers to services used by schools and libraries nationwide. You'll handle monitoring, profiling, and designing scalable, robust solutions using technologies like Airflow, Grafana, Prometheus, Docker, MongoDB, and MySQL. We're exploring Infrastructure as Code, Ansible, and new data engineering and database systems, and we're curious how you could contribute to these transitions. We're looking for a developer with strong, proven system design skills.

Does working on an innovative and socially relevant project excite you? Or do you have questions? Find out more here: https://www.nbdbiblion.nl/over-nbd-biblion/vacatures/vacatur...

Moyai | Amsterdam, The Netherlands | FULL-TIME | ONSITE | Founding Product Engineer |

About the company:

• Technical founding team with relevant industry experience

• Backed by well-known European VCs (SpeedInvest + Galion.exe)

• Cloud native & freedom to shape our tech stack (TypeScript + Python)

Ideal candidate:

• Previous experience at start-up building tech at scale

• Thinks in terms of product functionality and customer demands not just features

• Familiar with API first practices and frameworks

• Bonus points if you are an ex-founder or have been first hire before

Moyai is an AI-powered agent monitoring tool for AI engineers looking to catch agent failures in production. Reach out to the founder directly: [https://www.linkedin.com/in/rhommes/](https://www.linkedin.com/in/rhommes/) or visit our website https://moyai.ai

SpruceID (YC W21) | REMOTE (US-Based Preferred) | Full-Time | spruceid.com

[NEW ROLE FOR EXCEPTIONAL NEW GRADS OPEN]

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 credentials. 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.

We are hiring skilled 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 have high regard for public servants. We have a strong engineering and customer-oriented culture, and are not simply a SaaS product or AI wrapper. 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 ambitious to get outcomes for our customers and their constituents. 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, figure out stablecoin payments, 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.

We are interested in candidates who want to be proud of the meaningful impact they make for society, even if it takes time to get right. This is not the right job for someone who wants to "join a cool new AI startup" that implodes or exits in under a year.

See our roles here: https://jobs.lever.co/sprucesystems/

ChainSecurity | Blockchain Security Engineer | Full-time | INTERNS , HYBRID/REMOTE, Zurich, Switzerland | VISA possible | https://chainsecurity.com/

ChainSecurity is a young and innovative cybersecurity company that operates in the blockchain and cryptocurrency space. Our mission is to make the blockchain space secure and trustworthy for people, companies, and governments alike. We are proud of our security experts from the renowned universities ETH Zurich, EPFL Lausanne and others.

We are trusted by 100+ blockchain companies and established corporations with security audits and services. We have secured complex systems for top blockchain clients, such as decentralized finance (DeFi) projects, and multinational organizations, such as banks and industrial consortia. A ChainSecurity Auditor will review the most complex blockchain projects to find vulnerabilities which no-one else can. By using state of the art tools, expert knowledge and a deep understanding of the fundamentals, we secure projects handling billions, often forming the foundation in the new paradigm of an open financial system.

Your Responsibilities:

* Work directly with the developers of the most successful teams in the blockchain industry to audit their code and secure their products

* Contribute to our security tools and create new ones in collaboration with our internal research team

* Conduct security research and publish your findings

Requirements:

* Strong background in software engineering, focused on security relevant areas and most importantly being able to reason about complex code

* Experience with penetration testing, vulnerability scanning, threat modeling or similar is a plus

* Good knowledge of cryptography

* Proficiency with Linux and Git

* Good written communication skills

* Fluent in OOP programming language

Bonus Points:

* Formal Verification, White Box, Vulnerability Scanning

* Solid Blockchain Knowledge

* Consensus Algorithms

Join us here: https://www.chainsecurity.com/jobs/blockchain-security-engin...

Questions about the role? Contact: Email is hidden

Obie | Chicago, IL (Hybrid Tue/Thu) or Remote (US) | Full-time | Product Manager; Technical Project Manager (TPM) | https://ats.rippling.com/obie/jobs/76234395-2934-4746-a421-5..., https://ats.rippling.com/obie/jobs/4891a38c-9a69-47fa-9cc7-8...

Obie is an insurtech building modern software and tooling for a heavily regulated industry. We ship customer-facing product and internal platforms that handle complex workflows, partner constraints, and real-world edge cases — with a strong emphasis on systems thinking, product quality, and moving quickly without being reckless.

Roles: - Product Manager (platform with multiple surfaces/users/channels; strong product taste + technical curiosity) - Technical Project Manager (end-to-end delivery across engineering pods; scope/tradeoffs/dependencies/release readiness)

Apply via the links above. More info: https://www.obieinsurance.com/careers

eventfirst | Senior Full-Stack Engineer | Berlin, Germany | REMOTE (CET) | Full-time

We are applying AI to organize corporate events.

We are looking for a senior engineer with at least ten years of full stack experience, a strong focus on product and UX, and optionally some experience building LLM based products. Currently we are focussed on building tooling that enables us to capture domain knowledge from experts to streamline prompt creation and evaluation. Our tech stack is Typescript, React, Next.js and Tailwind. On the backend we use Drizzle with Neon, deployed and monitored via Vercel. We have pre-seed funding from a major US VC and are experienced founders. You’ll be working alongside the founders (ex-Apple, ex-Airbnb, ex-Tulip, ex-Tourlane) and will have a chance to shape the company, product and of course the engineering culture.

Apply here: https://eventfirst.jobs.personio.com/job/1646275

Rover | Barcelona, Spain & Seattle, USA | Software Engineers (Multiple Roles) | Full-time Rover is the world’s largest online marketplace for pet care. We connect millions of pet parents with trusted sitters and walkers, and we’re building a global platform that combines technology, community, and love for animals. With offices in Seattle, Barcelona, and beyond, we’re scaling an engineering culture focused on high-quality code, data-driven product decisions, and customer empathy. Open Roles:

Product Analyst (Seattle) Lead Data Analyst (Barcelona) Manager, Product Analytics (Barcelona) Senior Business Intelligence Analyst (Barcelona) Senior Product Analyst (Barcelona) Data Engineer (Barcelona) Staff Engineer, Payments Team (Seattle) Lead/Senior Software Engineer (Barcelona) Senior Frontend Platform Engineer (Barcelona) Senior Product Engineer (Barcelona) Manager, Product Design (Barcelona) Senior Product Designer (Barcelona) Senior Product Designer (Seattle)

Apply: https://www.rover.com/careers/engineering

CASUS | Full-time | Remote (EU time zone) + Quarterly Meet-ups | https://getcasus.com

We are looking for a Fullstack Engineer and AI enthusiast to join our engineering team.

We are rebuilding the core tool stack of the legal industry from the ground up. Lawyers still work in workflows designed decades ago: fragmented tools, manual reviews, static templates, and compliance processes that don’t scale. We think that’s unacceptable in an AI-first world.

This job is for you if you:

Love building from 0 to 1 and validating ideas quickly. Have a fullstack skillset, enjoying collaborating across the stack. Used to leveraging AI to code and most of your code is written with AI. Are curious about AI integration (e.g., LangChain, Azure LLMs) and want to push boundaries. Prefer startup speed over corporate processes.

Only apply if you've been heavily leveraging AI to code - our team moves at lightning speed.

apply here and show us the project you're most proud of: https://join.com/companies/casusch/15584391?

StorPool | Senior Software Engineer - Storage Core (C/Linux) | Remote (UTC-1 to UTC+5) | Full-time | Multiple roles

StorPool is building the future of data storage. Our software runs at the heart of modern clouds, delivering <100µs latency, 113M+ IOPS per cluster, and 99.999% availability. We're profitable, self-funded, and our customers love us (NPS off the charts).

We're looking for a Senior Software Engineer to join our Core Storage team. You'll tackle genuinely hard problems: writing custom Linux drivers, optimizing lock-free data structures at nanosecond scale, building fault-tolerant distributed algorithms, and debugging issues that go all the way down to kernel internals. This isn't CRUD work - it's systems programming at its most challenging.

Competitive salary, fully remote, meaningful time off, and a yearly education budget to keep learning.

If you get excited about shaving microseconds off I/O paths and building infrastructure that simply doesn't break, we should talk.

Apply here: https://storpool.com/force/senior-software-engineer-storage-...

Proton (https://proton.me) | Privacy & productivity | Full-Time | Europe, hybrid ONSITE, visa sponsorship | Scale-up, bootstrapped, profitable

I am listing mostly Mail desktop related positions, but there are a lot more on the site. New rust based client architecture: https://proton.me/blog/next-generation-proton-mail-mobile-ap...

1. Senior Software Engineer | London (UK), Geneva (Switzerland), Barcelona (Spain) | Windows, Linux, Rust, Mail | https://job-boards.eu.greenhouse.io/proton/jobs/4766179101

2. Software Engineer | London (UK), Geneva (Switzerland), Barcelona (Spain) | macOS, Windows, Linux, Rust, Mail | https://job-boards.eu.greenhouse.io/proton/jobs/4585460101

3. Staff QA Automation Engineer | London (UK), Geneva (Switzerland) | Mobile, Desktop | https://job-boards.eu.greenhouse.io/proton/jobs/4653905101

4. Senior Product Designer | London (UK), Paris (France), Barcelona (Spain) | Mobile, Desktop, Mail | https://job-boards.eu.greenhouse.io/proton/jobs/4606437101

5. Senior Product Manager | London (UK), Paris (France), Barcelona (Spain), Geneva (Switzerland) | Mobile, Desktop, Mail | https://job-boards.eu.greenhouse.io/proton/jobs/4364312101