Senior AI Engineer: Modernize Legacy Apps (C#/NET)

Nextlane; Porto; Hybrid; EUR 45,000 - 70,000; Full time

Benefits offered by this job

Hybrid Work

Annual Payments

Meal Voucher

Vacation Days

Language Training

Private Medical Insurance

Teambuilding Activities

Job summary

Nextlane in Porto is seeking a Mid/Senior Software Engineer who will be the hands-on advocate of AI within the team. You will lead by example, using AI coding agents across development, testing, documentation and code reviews.

Our product landscape spans modern apps built with C#/.NET and long‑lived systems in COBOL, Delphi, PowerBuilder, FoxPro and WinDev. You’ll work across both stacks, shaping architecture and driving modernization with AI as a central tool.

Qualifications

• 4 to 6 years of professional software development experience.
• Hands-on with AI coding agents (GitHub Copilot, Cursor, Claude Code).
• Willingness to work with legacy tech (COBOL, Delphi, PowerBuilder, FoxPro, WinDev).
• Strong experience with C#/.NET and/or React/TypeScript/JavaScript.
• SQL relational databases experience.
• Experience writing automated tests (unit/integration).
• Familiar with Git, CI/CD and Agile practices.
• Openness to legacy modernization and migration projects.

Responsibilities

• Lead by example in daily use of AI coding agents across development, testing and reviews.
• Configure and maintain AI agent setups, rules and workflows for the team.
• Share knowledge via demos, pair programming, and internal workshops.
• Identify repetitive tasks and propose practical improvements.
• Keep up with AI tooling landscape and bring ideas back to the team.
• Develop, maintain and evolve applications across C#/.NET and legacy tech.
• Use AI to analyze, document and explain legacy code and data flows.
• Collaborate with product, QA, DevOps and other teams.

Skills

4-6 years experience

AI coding agents

C#/.NET

React/TypeScript/JavaScript

SQL

Unit/integration testing

Git, CI/CD, Agile

Legacy tech openness

Tools

GitHub Copilot

Cursor

Claude Code

MCP servers / AI tooling

Job description

Nextlane in Porto is seeking a Mid/Senior Software Engineer who will be the hands-on advocate of AI within the team. You will lead by example, using AI coding agents across development, testing, documentation and code reviews.

Our product landscape spans modern apps built with C#/.NET and long‑lived systems in COBOL, Delphi, PowerBuilder, FoxPro and WinDev. You’ll work across both stacks, shaping architecture and driving modernization with AI as a central tool.