Cloud-Native API & Integration Lead (.NET)

Lessor Group; København; On-site; DKK 900,000 - 1,300,000; Full time

Job summary

Paychex Europe is seeking a Lead Integration Developer to modernise the Emply platform with .NET-based integrations and cloud-native patterns. You will define API architecture, drive integration standards, and mentor the team while delivering enterprise-grade solutions.

The role combines hands-on coding with architectural leadership, requires strong experience in C#/.NET, REST/GraphQL, and API modelling, and offers a collaborative office environment in Copenhagen.

Qualifications

• 10+ years of proven experience designing and developing enterprise applications.
• Experience modernising legacy codebases and handling non-functional requirements (security, performance, scalability).
• Strong ownership of architecture and ability to drive critical technical decisions.
• Hands-on experience with C#/.NET, MS SQL, REST, GraphQL, and API modelling with OpenAPI.

Responsibilities

• Defining integration architecture in collaboration with the Architect.
• Owning integration patterns and standards.
• Designing scalable APIs and integration services.
• Improving implementations, reducing complexity, and promoting code quality.
• Improving reliability, performance, and observability.
• Guiding migration toward cloud-native services and mentoring developers.

Skills

C#/.NET

MS SQL

REST

GraphQL

OpenAPI

DDD

Git

Azure DevOps

Jira

Mentoring

Tools

Git

Azure DevOps

Jira

Job description

Paychex Europe is seeking a Lead Integration Developer to modernise the Emply platform with .NET-based integrations and cloud-native patterns. You will define API architecture, drive integration standards, and mentor the team while delivering enterprise-grade solutions.

The role combines hands-on coding with architectural leadership, requires strong experience in C#/.NET, REST/GraphQL, and API modelling, and offers a collaborative office environment in Copenhagen.