Senior Software Engineer (Full-Stack)

About the role

We are looking for a senior full‑stack engineer to join Signifly’s Tech team in Copenhagen. You will help shape digital products for a variety of clients, working from the front‑end to back‑end while leveraging AI‑assisted development tools.

Key responsibilities

• Design, build and improve end‑to‑end digital products using Next.js, React and Node.js.
• Drive the adoption of agentic engineering by using AI coding agents and sharing insights with the team.
• Develop AI‑powered features and integrations such as LLM‑based automations and intelligent product experiences.
• Take technical ownership of client projects, including architecture decisions, technical direction and quality assurance.
• Lead by example on best development practices for both technical and non‑technical team members.
• Stay ahead of emerging trends and bring relevant innovations to client deliveries.
• Provide technical expertise and support across Signifly’s various teams.

Required profile

• Several years of senior‑level full‑stack development experience.
• Strong command of modern TypeScript, Next.js, React and backend technologies (Node.js, APIs, databases).
• Hands‑on experience with AI‑assisted or agentic development tools (e.g., Claude Code) and a curiosity for emerging AI techniques.
• Proven ability to understand client problems and propose effective technical solutions.
• Experience building AI‑native APIs or product features is a plus.

Required skills

• TypeScript
• Next.js
• React
• Node.js
• RESTful APIs
• Database design (SQL/NoSQL)
• AI coding agents (e.g., Claude Code)
• LLM integration