(Senior/Staff) Backend Engineer

AI in this role

openaianthropic

At Duna, we see the company as the second product we’re building and are continually working to create a transparent, ambitious culture. We want this to be the place where you do your best work.

Our mission is to redefine identity for the global economy. We’re backed by world-class investors including Index Ventures as well as founders and executives from companies like Stripe, Adyen, Notion, Remote, Qonto, Framer, Anthropic, Mollie, OpenAI, Goldman Sachs.

Since your role with us will rarely fit a job description, we only wrote a crisp overview.

WHAT YOU'LL BE DOING IN THIS ROLE

Design and build backend systems that are clean, testable, and efficient
Architect scalable APIs and infrastructure for high-trust environments
Own core systems end to end, and stay hands-on in the code
Bring strong opinions on testing, quality, and long-term maintainability
Tackle complex product challenges with a user-first mindset
Shape our engineering practices and technical culture

WHAT WE'RE LOOKING FOR

Senior or staff-level experience building and owning production systems
Systems thinking - you see beyond features to long-term system behaviour
Clear communicator who enjoys breaking down complexity and collaborating deeply
Appetite for learning and working in ambiguity
Curiosity
Big ambitions
Kindness

Bonus if you've built AI features and the evaluations behind them, or worked on product analytics.

Our current stack includes Node.js + TypeScript, Event Sourcing, Express, Postgres, RabbitMQ, Kubernetes, AWS. Experience with these is a plus, but not required. We are more excited about how you approach problems and find solutions.

A final note before you apply: please read through our website in detail. You'll find the fundamentals there: what we believe in, how we work, and why we're building this company.

We're a remote-first, fast-moving team of builders looking for exceptional people who love to create, build, and ship. Beyond passion and grit, we highly value curiosity, authenticity and kindness.

If this sounds like you, we'd love to hear from you!

PS. We are looking to hire passionate people from a variety of backgrounds. So even if you don't check all the boxes, we welcome your application!

How we rate this

(Senior/Staff) Backend Engineer at Duna rates 27 out of 100 for how much of the daily work is AI. That makes it Little AI (AI Level 1 of 4). The level is about AI in the job, not seniority.

Classification

Little AI. AI is not part of the work.

●●●● Builds AI80 to 100
●●●○ Works on AI60 to 79
●●○○ Uses AI40 to 59
●○○○ Little AI0 to 39

Levels come from how often the tools, models and workflows of the role are named in the posting itself. Open the description and count.

Prepare for this job

A free preview built only from this posting: what it asks for, what you could be asked in an interview, and how to adjust your resume.

Skills and AI tools this role asks for

OpenAIAnthropic

Questions you could be asked

What's a project where you used OpenAI hands-on?
Walk me through how you've used Anthropic in your day-to-day work.

Adapt your resume

List these exact terms on your resume: OpenAI and Anthropic. An applicant tracking system matches the wording, not the idea.
Attach one line of real, concrete experience to at least one of them — a tool named with nothing behind it rarely survives a human read.

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