Principal Full-Stack Engineer

PRINCIPAL FULL-STACK ENGINEER
REMOTE/FULL-TIME
Reports to: CTO

About the role

We're hiring a Principal Full-Stack Engineer to work directly with our CTO on new strategic initiatives at Digistore24.

You'll take an idea from a rough direction to working software in production, mostly on your own. This is a hands-on role: you'll write a lot of code, and you'll orchestrate a lot of agents to write more of it.

Who is Digistore24?

Digistore24 is the all-in-one online sales platform that combines the world's largest international affiliate marketplace with industry-leading conversion tools. Founded in Germany in 2012, we've been the online market leader in Germany since 2014 and have been expanding rapidly in the US since 2020. Today, more than 5 million users and 125,000+ active affiliates work with us, and over $5.1 billion in sales has gone through the platform. We're self-funded and work fully remote, with team members across Europe and the US.

Eklektika, a company from Belgrade, has existed for 20 years and recently became an integral part of the German/USA company Digistore24.

What you'll be working on

Digistore24 is one of the world's leading online sales platforms, with the largest international affiliate marketplace in the industry. Vendors use us to sell, affiliates use us to find offers to promote, and more than 5 million users work with us. You'll work on what comes next: new products and new capabilities on the platform, with a strong focus on AI and how agents will change commerce.

Most of the work is new. You'll build new services and products rather than maintain old ones, though you'll sometimes dig through our existing PHP codebase to work out how things behave today and what a new version needs to do. The scope will change, and a lot of it will start as a prototype.

You'll start with a few specific workflows. Within roughly your first four months, the goal is to have something real shipped and in the hands of pilot customers.

What you'll do

• Turn direction into working software. Take a goal from the CTO, break it down, plan your own work, decide how to build it, and ship it. Escalate only when something really needs it.
• Build end-to-end, backend first. Services, APIs, data pipelines, and integrations, plus the frontend on top. Whatever the problem needs.
• Mine the old to build the new. Read the existing codebase to pull out the real requirements, edge cases, and business rules a new version has to respect.
• Prototype, then harden. Get something working fast, learn from it, and turn what works into production-quality software.
• Run what you build. Deployment, monitoring, and cost control are part of the job.
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How we build

We build with coding agents every day, and this role sits at the far end of that. We're looking for someone who already works in fully agentic workflows rather than someone who uses an AI assistant now and then.

That means:

• You run agents autonomously on real work: several in parallel, on long-running tasks, with as little hand-holding as possible.
• You give agents what they need to succeed: clear specs, context, conventions, and tests. You structure codebases so agents can work in them reliably.
• You verify what agents produce, catch what's subtly wrong, and build the guardrails that keep quality high.
• You know where agents can be trusted and where a human has to stay in the loop, especially around money.
• You're tool-agnostic. You've used several agents and harnesses, and you pick the right one for the job.

We don't want AI enthusiasm. We want someone who has shipped real software this way and can tell us where it breaks.

What we're looking for

• 7+ years building production software. You're senior, and you still write code every day.
• Production experience with agentic engineering. You can walk us through your setup, how you run and verify agents, and a time it went wrong.
• A track record of working independently: you've owned ambiguous projects from start to finish without close direction.
• Strong backend engineering, with real PHP experience, since our core platform is built on it. You design APIs, services and data models that hold up under real traffic and real money.
• Strong React and Next.js.
• Good product judgment. You can turn a goal into a sensible scope and know what to leave out.
• Clear communication with engineers and leadership.
• Fluent written and spoken English, and the habits that make remote work go well: clear writing, proactive updates and async decisions.

Bonus points

• Python or Node.js in production.
• Experience leading engineering teams.
• E-commerce, checkout, or payments experience.
• You've built MCP servers, agent tooling, or evals for generated code.

Our stack

• Web frontend: TypeScript, React, Next.js, shadcn/ui
• Backend: PHP (core platform), Python, Node.js
• Infrastructure: Google Cloud
• AI tooling: Coding agents in every workflow

These are your benefits at Digistore24:

• Fully remote work, with flexible hours.
• Real autonomy and direct access to the CTO.
• Work that reaches a global marketplace from day one.
• Access to leading AI coding tools.
• Personal responsibility from day one.
• Work in your team as you are, without a dress code, and at eye level.
• An international team with strong cohesion.

Candidates participating in the selection process will be required to complete a test assignment as part of the evaluation process. This assignment will assess their skills and abilities necessary for the position.

Convince us of yourself in a letter of application (PDF).

Along with your CV and your salary expectations, send us a short note covering two things:

• Your agentic engineering setup: which tools you use, how you run and verify agents, and one thing you've learned the hard way.
• Something you built largely on your own that real users relied on, and what you'd do differently today.

Please note that we will only consider candidates who submit their resume and cover letter in English as PDF files.

Only shortlisted candidates will be contacted.