Senior Product Engineer (f/m/d)

JTL-Software GmbH; Berlin; Hybrid; EUR 110.000 - 140.000; Vollzeit

Zusammenfassung

countX, a Berlin-based SaaS company, is seeking a Senior Product Engineer to own features end-to-end—from discovery and design to deployment and iteration. You’ll work across the stack, making pragmatic engineering decisions that deliver meaningful customer value, with autonomy and a bias toward shipping.

The role emphasizes AI-assisted development using Claude Code, strong system thinking, and production-ready design across backend and frontend technologies.

Qualifikationen

• 7+ years of professional software engineering experience, with a strong background in fullstack and/or backend development.
• Demonstrated strength in system design thinking, able to reason about trade-offs, boundaries, and scale.
• Strong infrastructural thinking; comfortable with deployment, observation, and production operations.
• Proven hands-on usage of Claude Code and modern AI-assisted development methodologies.
• Track record of autonomous work and delivering with minimal supervision.
• Language- and platform-agnostic; able to adapt to whatever language or backend/frontend stack is optimal.
• Clear written and verbal English communication.

Aufgaben

• Own product features end to end—from discovery and design through delivery, monitoring, and iteration.
• Make sound system design and architecture decisions balancing speed, scalability, and maintainability.
• Think infrastructurally about how code runs, scales, and fails in production and design accordingly.
• Work autonomously with minimal supervision and set your own direction.
• Use Claude Code and AI-assisted workflows to deliver high-quality software faster.
• Collaborate with product, design, and other engineers to turn ambiguous problems into shipped solutions.
• Raise the engineering bar through pragmatic decisions and continuous improvement.

Kenntnisse

Fullstack/backend development

System design thinking

Infrastructural thinking

Claude Code usage

Autonomy

Ownership

English communication

Tools

Claude Code

Jobbeschreibung

Your mission

Working model: Hybrid

countX is a Berlin-based SaaS company that simplifies EU VAT compliance for e-commerce businesses. Our platform automates VAT registration, reporting, and compliance processes, enabling online merchants to expand across Europe with less administrative effort and lower compliance risk.

We are looking for a Senior Product Engineer to own features end-to-end—from problem discovery and system design to implementation, deployment, and continuous improvement. You will work autonomously across the stack, making pragmatic engineering decisions that deliver meaningful customer value. At countX, you won’t be handed a backlog of predefined tickets; instead, you’ll be trusted to identify opportunities, define solutions, and bring them to life.

Our engineering team embraces modern AI-assisted development practices and works extensively with Claude Code to accelerate development and improve code quality. Our tech stack includes PHP, TypeScript, Python, Go, and React, and we value engineers who are comfortable working across technologies and choosing the right tool for the problem at hand.

Your Responsibilities

• Own product features end to end — from discovery and design through delivery, monitoring, and iteration
• Make sound system design and architecture decisions, balancing speed, scalability, and maintainability
• Think infrastructurally — understand how your code runs, scales, and fails in production, and design accordingly
• Work autonomously with minimal supervision, setting your own direction and managing your own priorities
• Use Claude Code and modern AI-assisted development workflows to deliver high-quality software faster
• Collaborate with product, design, and other engineers to turn ambiguous problems into shipped solutions
• Raise the engineering bar through pragmatic decisions, clean implementation, and continuous improvement

Your profile

• 7+ years of professional software engineering experience , with a strong background in fullstack and/or backend development
• Demonstrated strength in system design thinking — able to reason about trade-offs, boundaries, and scale
• Strong infrastructural thinking — comfortable with how systems are deployed, observed, and operated in production
• Proven, hands‑on usage of Claude Code and modern AI-assisted development methodologies
• Track record of working autonomously and delivering with minimal supervision
• Language agnostic — able to pick up and be productive in whatever language a problem calls for
• Platform agnostic — comfortable across backend, frontend, cloud, and tooling as needed
• Strong ownership mindset and a bias toward shipping
• Strong, clear written and verbal communication in English