Principal Python Developer - Django

Who we are

Johnson Controls is a global diversified technology and multi-industrial leader serving a wide range of customers in more than 150 countries. We create intelligent buildings, efficient energy solutions, integrated infrastructure and next generation transportation systems that work together seamlessly. Bring your passion for innovation and we will challenge you to help us create a better tomorrow.

BEGIN YOUR CAREER WITH A FOCUS ON TOMORROW!

What you will do

Imagine a career that perpetually stretches your capabilities. From managing many of the world's most iconic buildings to making products that help save lives, the breadth of our opportunities empowers you to chart your own path. We are a truly global company that embraces diversity, rewards hard work and inspires people to reach for more. In an environment that is constantly evolving, we will set the foundation for you to grow and chart a career path that is as unique as you are.

We are seeking a Principal Python Developer with expertise in Django to join our team in Belfast. The ideal candidate will have deep experience in debugging, root cause analysis and SQL as well as a strong understanding of Windows and Linux environments. Experience with React is a plus. You will be responsible for designing, developing and optimizing scalable applications while ensuring high reliability and performance.

How you will do it

• Develop and maintain web applications using Python and Django
• Conduct advanced debugging and root cause analysis to troubleshoot complex issues
• Optimize SQL queries and database performance (PostgreSQL / MySQL preferred)
• Work in both Windows and Linux environments, handling deployments and system configurations
• Collaborate with cross-functional teams to design and implement scalable solutions
• Ensure code quality through testing, reviews and best practices

What we look for

• Authorization to work in the UK and ability to work in the office three days per week
• A degree in IT or relevant experience combined with industry qualifications (essential)
• 5+ years of professional experience in Python and Django
• Strong debugging skills, ability to analyze logs, diagnose issues and find root causes quickly
• Expert-level SQL skills (query optimization, indexing, stored procedures, etc.)
• Proficiency in both Windows and Linux environments
• Experience with version control (Git), CI/CD and containerization (Docker)
• Strong understanding of REST APIs, authentication and security best practices
• Excellent problem-solving skills and ability to work independently
• Experience with React (or modern front-end frameworks) - preferable
• Cloud experience (AWS, Azure or GCP) - preferable
• Familiarity with DevOps practices and automation - preferable

What we offer:

• Comprehensive benefits package including health and pension plan, life assurance, 22 days of paid holidays, flexible working hours, holiday purchase scheme; long service awards; employee assistance programme; free car parking; canteen on site and employee discounts.