Senior Software Engineer (Backend Focus) - SaaS with AI

LeanLinking ApS; Denmark; On-site; DKK 900,000 - 1,200,000; Full time

Benefits offered by this job

Competitive salary

Professional development

Great lunch

Job summary

LeanLinking ApS, a small, dynamic SaaS company, seeks a Senior Software Engineer to own backend development with strong frontend capabilities in React TypeScript. You will write code daily, influence architecture, and mentor teammates while integrating AI and LLM tools into daily workflows.

You’ll collaborate with the .NET Core backend and React TypeScript frontend, build robust solutions, and help shape how AI is used across the product and development process.

Qualifications

• Strong experience with .NET Core and React TypeScript (or similar).
• Solid understanding of both frontend and backend development.
• Hands-on experience using AI coding assistants in real projects.
• Bonus: experience setting up project-level AI context files.
• Fluency in written and spoken English.

Responsibilities

• Develop and maintain features across the entire stack, with a focus on the backend.
• Use AI coding assistants as a normal part of daily workflow for scaffolding, refactoring, and tests.
• Use AI services to build smarter product workflows faster.
• Help maintain and evolve project context files to keep AI tools grounded in codebase conventions.
• Prototype and test new AI/LLM-driven concepts and features.
• Collaborate on technical and architectural decisions.
• Participate in client meetings to evaluate and scope requests.
• Mentor and spar with other developers, sharing knowledge and experience.

Skills

.NET Core

React TypeScript

Full-stack development

Mentoring

English communication

Tools

Claude Code

GitHub Copilot

Cursor

Codex

Job description

LeanLinking ApS, a small, dynamic SaaS company, seeks a Senior Software Engineer to own backend development with strong frontend capabilities in React TypeScript. You will write code daily, influence architecture, and mentor teammates while integrating AI and LLM tools into daily workflows.

You’ll collaborate with the .NET Core backend and React TypeScript frontend, build robust solutions, and help shape how AI is used across the product and development process.