Senior Full-Stack Engineer: AI-Driven, Agentic Systems

Agsweltgermany; København; Hybrid; DKK 900,000 - 1,200,000; Full time

Job summary

Signifly in Copenhagen is seeking a Senior Software Engineer (Full-Stack) to join its Tech team. You will work across frontend and backend services, building AI-powered features and agentic integrations while owning architecture decisions and project direction.

Required are senior full-stack experience and strong skills in TypeScript, Next.js/React, and Node.js. AI-assisted development and client-facing ownership are emphasized.

Qualifications

• Solid experience as a senior full-stack developer.
• Strong skills in modern TypeScript, Next.js/React and backend development.
• Experience with Node.js, APIs and databases.
• Hands-on experience with AI-assisted and agentic development.
• Experience with Claude Code or similar tools.
• Curiosity about AI-assisted and agentic development.
• Experience building AI-native APIs and product features is a plus.
• Ability to understand client problems and propose technical solutions.
• Ability to support clients, PMs, developers and sales teams.
• Ability to take ownership of code and projects.

Responsibilities

• Take technical ownership of client projects and architecture decisions.
• Provide technical direction and ensure development quality.
• Collaborate with frontend, backend, and product teams to deliver features.
• Share knowledge and mentor peers to grow the team.

Skills

Senior full-stack

TypeScript

Next.js/React

Node.js

APIs & databases

AI-assisted development

Agentic development

Claude Code

Client problem solving

Project ownership

Tools

Claude Code

Job description

Signifly in Copenhagen is seeking a Senior Software Engineer (Full-Stack) to join its Tech team. You will work across frontend and backend services, building AI-powered features and agentic integrations while owning architecture decisions and project direction.

Required are senior full-stack experience and strong skills in TypeScript, Next.js/React, and Node.js. AI-assisted development and client-facing ownership are emphasized.