Data Engineering Principal

BT Group; London; On-site; GBP 90,000 - 120,000; Full time

Job summary

A leading telecommunications firm in London seeks a Data Engineering Principal to lead the design and implementation of scalable data solutions. The ideal candidate should possess extensive experience with AWS services and proficiency in Python and Apache Spark. This role offers opportunities for mentoring within a diverse team as part of a forward-thinking organization.

Benefits

Diversity and inclusion initiatives

Flexible working options

Opportunities for continuous learning

Qualifications

• Deep technical expertise in data engineering with modern practices.
• Expert in AWS cloud services for scalable solutions.
• Experience in software architecture focusing on microservices.
• Proficient in Python and Apache Spark for data processing.
• Strong ability to set technical direction and optimize performance.
• Capable of using CI/CD pipelines for streamlined development.

Responsibilities

• Lead the design of data solutions using AWS services.
• Migrate legacy data workflows to Lakehouse architectures.
• Provide strategic guidance on best practices for data projects.
• Build and optimize data pipelines for quality and performance.
• Manage service level agreements for data products.
• Mentor engineering professionals in best practices.

Skills

Technical expertise in data engineering

AWS cloud services

Software architecture and solution design

Proficiency in Python

Apache Spark

Automation tools and CI/CD

Exceptional communication skills

Mentoring and coaching

Tools

AWS Glue

EMR

AWS Lambda

Apache Iceberg

Job description

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Data Engineering Principal

Posting Date: 11 Aug 2025

Function: Data & AI

Unit: Networks

Location:

1 Braham Street, London, United Kingdom

Internal Closing Date: 20/8/25

DevOps

Data Storage

Data Integration

Programming/Scripting

Data Quality

Cloud Computing

Performance Monitoring

Agile Methodologies

Data Management

Data Acquisition

Data Risk

Talent Management

Decision Making

Growth Mindset

Performance Management

Looking in:
Leading inclusively and Safely
I inspire and build trust through self-awareness, honesty and integrity.
Owning outcomes
I take the right decisions that benefit the broader organisation.

Looking out:
Delivering for the customer
I execute brilliantly on clear priorities that add value to our customers and the wider business.
Commercially savvy
I demonstrate strong commercial focus, bringing an external perspective to decision-making.

Looking to the future:
Growth mindset
I experiment and identify opportunities for growth for both myself and the organisation.
Building for the future
I build diverse future-ready teams where all individuals can be at their best.

With over 175 years of heritage, BT is now the flagship business brand of BT Group. We’ve brought together our best people and capabilities into a B2B powerhouse serving 1.2 million business customers internationally.

We’re a global leader for secure connectivity and collaboration platforms for businesses of all shapes and sizes, from big household names and government departments, right through to sole traders and new start-ups. But it’s not just the technology that matters, it’s what it can do to help them build stronger, smarter, more secure businesses.

We value diversity and inclusion and believe in making a positive impact. We connect for good by championing digital inclusion and equipping people, businesses, and communities with digital skills to thrive.

As a member of our team, you will be part of an organisation that celebrates difference, fosters innovation and provides you with opportunities to be your best. With millions of businesses relying on us daily, joining BT means you can be part of a diverse and multi-skilled team that makes a significant impact to society.

Why this job matters
The Data Engineering Principal leads the AWS design, building and implementation of processes to capture, manage, store and utilise structured and unstructured data from internal and external sources, turning the most complex business needs into the data that supports the DD Ops and BT group’s data strategies. This role involves both hands-on development and providing technical leadership to teams, ensuring the delivery of high-quality, scalable, and efficient data infrastructure.

What you’ll be doing – your accountabilities

• Lead the design and implementation of robust, scalable, and secure data solutions using AWS services such as S3, Glue, Lambda, Redshift, EMR, Kinesis, and more—covering data pipelines, warehousing, and lakehouse architectures.
• Drive the migration of legacy data workflows to Lakehouse architectures, leveraging Apache Iceberg to enable unified analytics and scalable data management.
• Operate as a subject matter expert across multiple data projects, providing strategic guidance on best practices in design, development, and implementation.
• Build and optimise data pipelines for ingestion, transformation, and loading from diverse sources, ensuring high standards of data quality, reliability, and performance.
• Own the development of automation and monitoring frameworks that capture operational KPIs and pipeline health metrics, enabling proactive performance management.
• Identify and resolve performance bottlenecks in data workflows, ensuring optimal resource utilisation and cost-efficiency.
• Collaborate closely with architects, Product Owners, and development teams to decompose solutions into Epics, leading the design and planning of technical components.
• Mentor and coach engineering professionals, fostering a culture of continuous learning, innovation, and technical excellence.
• Champion inclusive and open team culture, leading complex projects autonomously and facilitating high-impact technical discussions.
• Define and manage service level agreements (SLAs) for data products and production processes, ensuring reliability and accountability.
• Develop and optimise data science procedures, including storage strategies using distributed structures, databases, and other scalable technologies.
• Lead the implementation of continuous improvement initiatives, enhancing team processes and delivery capabilities.
• Serve as a trusted advisor to internal stakeholders, including data science and product teams, translating complex technical concepts into actionable solutions.

Skills Required:

• Possess deep technical expertise in data engineering, with a strong command of modern practices and methodologies.
• Recognised as an expert in AWS cloud services, particularly in designing and implementing scalable data engineering solutions.
• Bring extensive experience in software architecture and solution design, ensuring robust and future-proof systems.
• Hold specialised proficiency in Python and Apache Spark, enabling efficient processing of large-scale data workloads.
• Demonstrate the ability to set technical direction, uphold high standards for code quality, and optimise performance in data-intensive environments.
• Adept at using automation tools and CI/CD pipelines to streamline development, testing, and deployment processes.
• An exceptional communicator, capable of translating complex technical concepts for diverse audiences including engineers, product managers, and senior leadership.
• Provide thought leadership within engineering teams, fostering a culture of quality, efficiency, and collaboration
• Experienced in mentoring engineers, guiding them in advanced coding practices, architectural thinking, and strategic problem-solving to elevate team capabilities.

Experience you’d be expected to have

• Former Principal Engineer with a proven track record of leading teams in best practices across design, development, and implementation. Known for mentoring engineers and cultivating a culture of continuous learning and innovation.
• Extensive background in software architecture and solution design, with deep expertise in microservices, distributed systems, and cloud-native architectures.
• Advanced proficiency in Python and Apache Spark, with a strong focus on ETL data processing and scalable data engineering workflows.
• In-depth technical knowledge of AWS data services, with hands-on experience implementing data pipelines using tools such as EMR, AWS Glue, AWS Lambda, Step Functions, API Gateway, and Athena.
• Proven experience in designing and delivering Lakehouse architectures, enabling unified analytics across structured and unstructured data.

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.

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.