Lead Integration Developer (.NET / APIs / Cloud) for Emply

Paychex Europe; København; Hybrid; DKK 900,000 - 1,100,000; Full time

Job summary

Paychex Europe’s Emply division is seeking a Lead Integration Developer to define the technical direction for APIs and cloud-based integrations within a growing HCM platform. You’ll combine hands-on coding with architectural leadership to shape scalable, secure enterprise solutions.

You’ll mentor a team of developers across Europe, drive best practices, and collaborate with architects, product owners, and Scrum teams to deliver high-quality integrations using .NET, REST and GraphQL in a hybrid

Qualifications

• 10+ years of proven experience designing and developing enterprise applications.
• Experience modernising legacy codebases and non-functional requirements such as security, performance, and scalability.
• Strong ownership of architecture and the ability to drive critical technical decisions.

Responsibilities

• Define integration architecture in collaboration with the Architect.
• Own integration patterns and standards.
• Design scalable APIs and integration services.
• Mentoring developers and raising engineering standards.

Skills

C# / .NET

REST APIs

GraphQL

OpenAPI modeling

DDD

Architectural ownership

Mentoring

Strong communication

Hands-on coding

English proficiency

Tools

MS SQL

Hangfire

Azure DevOps

Jira

Git

Job description

At Paychex Europe, we simplify payroll, HR and workforce management for businesses across Europe. We believe great results come from people who take ownership, share knowledge, challenge the status quo and treat colleagues and customers with honesty and respect. These behaviors shape our culture and reflect the values we live by: Integrity, Respect, Partnership, Curiosity, Accountability and Service.

When you join our team, you can make a mark by helping us deliver solutions that make work easier for businesses and their employees.

Lead Integration Developer (.NET / APIs / Cloud) for Emply

We're modernising the platform behind our rapidly growing HCM product, Emply People. As our Lead Integration Developer, you'll define the technical direction for APIs and integrations while helping evolve the platform towards a cloud-native architecture.

As a senior team member, you will be involved in hands‑on coding, design, development, customization, configuration, testing, and deployment of enterprise software solutions. Additionally, you will mentor and coach colleagues while making key technical decisions, combining hands‑on development with technical leadership.

Emply People is a flexible HR solution for small and medium‑sized businesses, supporting the full employee journey, from recruitment and onboarding to performance, time and absence management, and offboarding.

We're transitioning to modern technologies including microservices, containerisation and serverless architectures. You'll play a key role in this transformation from an integration perspective, helping build a more scalable, efficient and agile platform.

We're looking for a Lead Developer with strong hands‑on experience building enterprise‑grade integrations using the .NET stack.

What You Will Do

Besides your daily role in Emply, you'll be part of a team of seven Lead Developers across Paychex. You'll work closely with our Architect, Product Owner/Specialist, Scrum Master, and development teams in Poland and Ukraine to design, develop, and support our browser-based product within an agile Scrum framework.

As Lead Integration Developer, You'll Be Responsible For

• Defining integration architecture in collaboration with the Architect.
• Owning integration patterns and standards.
• Designing scalable APIs and integration services.
• Improving technical implementations, simplifying the codebase, and promoting coding best practices.
• Improving reliability, performance, and observability.
• Guiding the migration towards cloud‑native services.
• Mentoring developers and raising engineering standards.

What Will Help You Succeed

• 10+ years of proven experience designing and developing enterprise applications.
• Experience modernising legacy codebases and working with non‑functional requirements such as security, performance, and scalability.
• Strong ownership of architecture and the ability to drive critical technical decisions.
• Hands‑on experience with C#/.NET, MS SQL, Hangfire, REST, and GraphQL.
• Experience with API/interface modelling using OpenAPI.
• Strong understanding of integration, including enterprise integration patterns, synchronous vs. asynchronous integration, and related trade‑offs.
• Experience with Domain‑Driven Design (DDD).
• Experience with Git and development tools such as Azure DevOps and Jira.
• A proactive approach, with the ability to work independently and take ownership.
• Strong communication skills, with the ability to explain technical concepts in clear business terms and act as a technical sparring partner and mentor to other developers.
• Excellent written and spoken English

What We Offer

In addition to Emply's incredible people and mission, we strive to foster a motivating and uplifting culture. Our offices are bright and open, with locations in Denmark and Germany. We work closely across teams and encourage a social culture, believing that working together socially makes tackling challenges more enjoyable. You will work in our Østerbro office, in a team that cares about its members and enjoys a good laugh. In short, you’ll experience plenty of learning and exciting challenges in a great work environment.

Emply is part of Paychex Europe, a leading provider of HCM solutions. Paychex Europe is growing rapidly and expanding into the European market, constantly seeking passionate talent to join them on this exciting journey. Find out more at www.emply.com.

We value different perspectives and believe diverse teams make better decisions.

Respect and partnership are at the heart of how we work together. We welcome applications from all qualified individuals, regardless of age, gender identity, ethnicity, sexual orientation, disability, religion or background. At Paychex Europe, we strive to create an inclusive environment where everyone can contribute and thrive. Our hiring decisions are based on skills, experience and potential.

Start date: As soon as possible

Location: Østerbro (Hybrid)

Full time, 40 hours per week.

Contact Person: Jacob Borella Lead Developer Lead

Contact Email: [e-mail]

Job area: Digital Business Solutions

Position type: Full time

Job country: Denmark

Location of job: Østerbro (Copenhagen)

Title: Lead Integration Developer (.NET / APIs / Cloud) for Emply

Deadline: As soon as possible