Senior Backend Engineer (Kotlin/Java)

MCS Group; Belfast; On-site; GBP 50,000 - 70,000; Full time

Job summary

A fast-growing technology company in the energy sector seeks 2 Senior Backend Engineers to join their Belfast team. The role involves designing scalable backend services, collaborating with cross-functional teams, and mentoring other engineers. The ideal candidate will have 5+ years of experience, be proficient in Kotlin, Java, Scala, or strong in other major languages, and possess cloud and SOA/Microservices experience. Competitive package includes a 15% bonus, equity, pension, and health cover.

Benefits

High-impact role on a growing platform

Flexible working and WFH support

Competitive package with 15% bonus, equity, pension, and health cover

25 days annual leave + statutory holidays

Group Critical Illness & Life Cover

Employee Assistance Program

Wellness allowance

Qualifications

• 5+ years experience building high-quality, scalable solutions.
• Proficient in languages such as Kotlin, Java, Scala or strong experience in Java, Go, Python,Scala, C#.
• Experienced with SOA/Microservices & CI/CD.
• Cloud experience (GCP/AWS/Azure) is essential.
• Comfortable collaborating with remote teams.
• Quick learner, adaptable to new technologies and tools.

Responsibilities

• Design and build scalable backend services powering the platform.
• Collaborate with Product, Design, and Engineering to deliver new features.
• Improve processes and enhance team collaboration.
• Mentor and support other engineers.

Skills

Kotlin

Java

Scala

Go

Python

C#

SOA/Microservices

Cloud (GCP/AWS/Azure)

Job description

Overview

MCS Group is partnering exclusively with a fast-growing technology company in the energy sector. They are expanding their Belfast engineering team and are looking for 2 Senior Backend Engineers to join and hit the ground running. The company builds a platform connecting businesses with external partners, helping large-scale operations work more efficiently and reliably.

Responsibilities

• Design and build scalable backend services powering the platform
• Collaborate with Product, Design, and Engineering to deliver new features
• Improve processes and enhance team collaboration
• Mentor and support other engineers

Qualifications

• 5+ years experience building high-quality, scalable solutions
• Proficient in languages such as Kotlin, Java, Scala (also open to strong engineers from Java, Go, Python, Scala, or C# backgrounds eager to cross-train)
• SOA/Microservices & CI/CD exposure
• Cloud experience (GCP/AWS/Azure)
• Comfortable collaborating with remote teams
• Quick learner, adaptable with new technologies and tools

What’s in it for you

• High-impact role on a growing platform
• Flexible, modern ways of working with strong career progression
• Competitive package with + 15% bonus, equity, pension, and health cover
• 25 days annual leave + statutory holidays
• Group Critical Illness & Life Cover, Employee Assistance Program
• Flexible working, WFH support, and wellness allowance
• Collaborative engineering culture focused on learning, mentoring, and growth

To speak in absolute confidence about this opportunity please contact Rachael Walker, IT Recruitment Manager at MCS Group 02896935487 or click the apply button below.

If this position is not right for you, we have others that are.

Please visit MCS Group www.mcsgroup.jobs to view a wide selection of our current jobs or give us a call 028 9023 5456.

All conversations will be treated in the strictest of confidence.