Senior .NET Backend Engineer, C#, Domain Modeling, AI

Yukawa Exponential GmbH

Senior Software Engineer in .NET managing complex applications with TypeScript/React and AI integration. Collaborating with teams to ensure clean, testable, and maintainable code across projects.

Posted 5/16/2026full-timeAachen • 🇩🇪 GermanySeniorWebsite

Tech Stack

Tools & technologies

AzureCloudDockerKubernetes.NETOraclePostgresReactSQLTypeScript

About the role

Key responsibilities & impact

As a Senior Software Engineer you are the technical anchor in one of our client projects.
You take responsibility for the architecture and implementation of data-intensive, business-complex applications in the .NET environment with full-stack components in TypeScript/React and a growing AI component.
You work closely with Product Owners, Data Scientists and domain experts, help the team grow (pair programming, code reviews) and ensure that what we build is clean, testable and maintainable.
Design and implementation of sophisticated backend and full-stack solutions in C# / .NET
Domain modeling of complex rules and data structures – from requirements to production systems
Integration of AI models (LLMs, classifiers, recommendation systems) into existing and new applications
Building and operating data and rules pipelines, including database design (MS SQL, Oracle, PostgreSQL)
Responsibility for testing, CI/CD and code quality
Pair programming, code reviews
Shaping technical decisions across projects and client boundaries

Requirements

What you’ll need

At least 5–10 years of professional software development experience
Very strong .NET / C# profile at production level
Experience in software architecture and domain modeling of complex business logic
Practical experience with relational databases (MS SQL, Oracle or PostgreSQL) and data-intensive applications
Confident handling of cloud (ideally Azure), Docker, Kubernetes, Git and modern CI/CD pipelines
Interest in and initial experience integrating AI / LLMs into production software
Independent, structured working style and enjoyment of pair programming and code reviews
German business proficient, English fluent
Strong communication skills and confidence in direct customer contact: You are comfortable working in the client team, speaking with business stakeholders and representing technical decisions
Willingness to be on-site at the client occasionally (e.g. in NRW)

Benefits

Comp & perks

Permanent employment at Yukawa with a best-of-both-worlds setup: you work deeply in client projects but have a permanent, technically strong team backing you
Hybrid work: mostly remote, with regular on-site days at the client and joint Yukawa team days
Challenging projects directly in real enterprise environments
AI running in production, not just in PowerPoint
Real impact at the client: you are perceived as part of the client team and help shape outcomes
Small, technically strong Yukawa team as a home base: short communication paths, a lot of responsibility
High-quality hardware of your choice
Personal training budget (conferences, books, certifications)

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Hard Skills & Tools

.NETC#TypeScriptReactAI integrationdomain modelingrelational databasesdata-intensive applicationscloud computingCI/CD

Soft Skills

communication skillspair programmingcode reviewsindependent workingstructured working stylecustomer contactteam collaborationtechnical decision-making