Job Description
Data Engineer
Req ID:  56884
Posting Start Date:  10/04/2026
Job Function:  Software Engineering
Division:  Networks
Job Location:  GBR Belfast - Riverside Tower, GBR-London-BTHQ One Braham
Advertised Salary:  competitive + great benefits

All Locations: London, Belfast

Working Style: 3 days a week in office, 2 days from anywhere

Why this job matters

Data is a vital part of our business and with your help, we can improve the services that we provide to our customers through engineering excellence of our data products. You’ll be working on exciting data products which support TV, Broadband, Digital Voice and market leading technologies like Unbreakable Wi-Fi.  We deliver these critical services using the latest cloud technologies on AWS, GCP and Cloudera.

When you join us as a lead data engineer, you’ll have the opportunity to be part of our Data & AI Enablement Team where you will help to design, build, and support high quality engineering products from our extensive data sources and multi-cloud environment.

As a team we believe in the agile principles of openness, transparency and continuous improvement, which underpin strong relationships with our business stakeholders.

There will be lots of opportunities to explore new technologies, develop new skills, innovate and grow as an engineer.

What you’ll be doing

  • Design, develop, and maintain end-to-end data pipelines using Ab Initio (GDE, PDL, Conduct>IT, Express>IT).
  • Build scalable batch and streaming workloads using Apache Spark (PySpark/Scala).
  • Develop and orchestrate data ingestion flows using Apache NiFi for real-time and near-real-time use cases.
  • Optimize ETL/ELT jobs for scalability, throughput, and resource efficiency.
  • Perform bottleneck analysis and tuning for Spark jobs, NiFi processors, and Ab Initio graphs.
  • Demos and knowledge transfers to stakeholders around product developments.
  • Spread your experience and knowledge to junior engineers.
  • Improve automated testing and deployments using CI/CD pipelines.
  • Expectation to line manage small team of junior data engineers.
  • Continual learning through internal and external training.

What you'll bring

  • Proficient in building Big Data solutions using Hadoop or GCP or AWS.
  • Skilled in technologies such as Scala, Java, Python, Spark (PySpark/Scala), Kafka, Kinesis, BigQuery, Dataflow, BigTable, Terraform, and SQL.
  • Experience with Terraform, Kafka, Kinesis, SQL are nice to have
  • Strong expertise in Ab Initio (GDE, PDL, Conduct>IT, Express>IT, EME) with a focus on parallel processing and component optimisation.
  • Hands-on experience with Apache Spark, including Spark SQL, Spark Streaming, and performance tuning.
  • Practical experience with Apache NiFi for flow design, processor tuning, error handling, and security configurations.
  • Good understanding of Infrastructure as Code toolsets.
  • Experienced in implementing Continuous Integration and Deployment strategies.
  • Proficient in using Atlassian tools such as Confluence and JIRA.
  • Experienced in version control using Git or SVN.
  • Able to clearly present technical issues, progress, and outcomes to team members and Product Owners.
  • Demonstrates enthusiasm for learning and applying new technologies.
  • Experience or interest in managing and developing team members.
  • Capable of building new solutions as well as supporting existing data products and platforms.

Our Package

Tailored benefits make a real difference. That’s why we offer a comprehensive range to support your growth, wellbeing, and everyday life. You can design the package to suit you and your lifestyle. Your core benefits include:
• 10% on target annual bonus
• Access to an online private GP 24/7 for you and your immediate family 
• Market-leading paid carers leave with up to 2 weeks off 
• Equalized maternity, paternity, and adoption leave – 18 weeks’ full pay and 8 weeks’ half pay
• Discounted EE and BT products, including mobile and broadband
• Market leading Pension scheme – 5% from you and 10% from us
• Holiday purchase scheme

You can select additional benefits, including healthcare, dental, gym memberships and more when you’re ready.
Ready to connect for good and help shape the future? Apply now

About us

BT Group was the world’s first telco and our heritage in the sector is unrivalled.  As home to several of the UK’s most recognised and cherished brands – BT, EE, Openreach and Plusnet, we have always played a critical role in creating the future, and we have reached an inflection point in the transformation of our business. 
 
Over the next two years, we will complete the UK’s largest and most successful digital infrastructure project – connecting more than 25 million premises to full fibre broadband.  Together with our heavy investment in 5G, we play a central role in revolutionising how people connect with each other. 
 
While we are through the most capital-intensive phase of our fibre investment, meaning we can reward our shareholders for their commitment and patience, we are absolutely focused on how we organise ourselves in the best way to serve our customers in the years to come.  This includes radical simplification of systems, structures, and processes on a huge scale. Together with our application of AI and technology, we are on a path to creating the UK’s best telco, reimagining the customer experience and relationship with one of this country’s biggest infrastructure companies.  
 
Change on the scale we will all experience in the coming years is unprecedented.  BT Group is committed to being the driving force behind improving connectivity for millions and there has never been a more exciting time to join a company and leadership team with the skills, experience, creativity, and passion to take this company into a new era.

A FEW POINTS TO NOTE:

Although these roles are listed as full-time, if you’re a job share partnership, work reduced hours, or any other way of working flexibly, please still get in touch.

We will also offer reasonable adjustments for the selection process if required, so please do not hesitate to inform us.

DON'T MEET EVERY SINGLE REQUIREMENT?

Studies have shown that women and people who are disabled, LGBTQ+, neurodiverse or from ethnic minority backgrounds are less likely to apply for jobs unless they meet every single qualification and criteria. We're committed to building a diverse, inclusive, and authentic workplace where everyone can be their best, so if you're excited about this role but your past experience doesn't align perfectly with every requirement on the Job Description, please apply anyway - you may just be the right candidate for this or other roles in our wider team.