Senior Backend Engineer (C# / .NET - ERP Platform)

This role is for CODE LEAP's client company - JTL-Software

JTL-Software is one of Germany's leading providers of e-commerce and ERP solutions. More than 50,000 retailers rely on JTL every day to run their business. Our global development center in Vietnam is looking for talented people to build the next generation of these products. You'll work in an international team that pairs German software quality and Vietnamese speed to innovate.

You don't just want to implement features – you want to help modernize and evolve one of the largest ERP systems in the German-speaking e-commerce market. As a Backend Engineer at JTL, you will work on a large-scale software platform that is currently undergoing a major transformation towards modular architectures, modern APIs, and cloud-ready services.

At JTL, AI-assisted development is not a nice extra – it is a core part of how we work. Our engineers use tools like GitHub Copilot, Claude Code, ChatGPT, and similar AI assistants every day. We expect you to either bring hands-on experience with these tools or demonstrate a clear, verifiable willingness to actively use them.

YOUR EXCITING TASKS

• You develop and maintain backend services and business logic using modern .NET technologies.
• You contribute to the modernization of a large existing software platform and help shape its future architecture.
• You design, implement, and evolve REST and GraphQL APIs.
• You analyze and improve existing code, data structures, and technical workflows.
• You implement automated tests and help establish sustainable quality practices.
• You participate in code reviews and contribute to technical discussions and design decisions.
• You collaborate closely with frontend developers, quality engineers, architects, and product managers.
• You identify technical risks, challenge assumptions, and contribute to continuous improvement.

• 5+ years of experience developing software with C# and .NET.
• Strong understanding of software design, maintainability, and clean code principles.
• Experience working with relational databases, ideally Microsoft SQL Server.
• Experience designing and integrating APIs.
• Ability to understand and navigate complex existing systems.
• Experience with automated testing and quality-focused development practices.
• Strong analytical and problem-solving skills.
• Hands-on experience with AI-assisted development tools or a clear willingness to adopt them.
• Excellent English communication skills, both written and spoken.

• ASP.NET Core
• Entity Framework
• GraphQL
• Azure
• Docker
• Modularization of large monolithic applications
• Enterprise or ERP software environments
• Experience with large-scale software modernization initiatives

• Competitive salary and benefits
• Year-end bonus (13th-month salary)
• Generous annual leave of up to 18 days
• Additional premium health insurance
• Enjoy an endless selection of delicious refreshments, including gourmet coffee, beverages, snacks, and fresh fruits, all complimentary
• 1-on-1 coaching with experienced professionals
• Flexible work policy, which provides flexible hours to accommodate personal schedules and commitments
• Dynamic, fun, and agile environment, perfect for sharing and creativity
• Open-minded, kind & humble colleagues

Come to talk to us at [email protected]

About Us

With our expert teams spread across two continents, CODE LEAP provides innovative software solutions for venture-backed companies and leading enterprise businesses in Germany. Our teams in Berlin (Germany) and Ho Chi Minh City (Vietnam) work hand in hand to develop state-of-the-art solutions of the highest quality.

Because collaborating with the right people is the secret to our successful growth.

We future-proof organizations - be part of it!