Java API Developer Designer

Recruiter: Molly Lees

Hiring Manager: Ismail Hameed

Career Grade: D

Location: Belfast

Internal Closing Date: 12/06/25

Why this job matters: 

Working in this role, you will play a critical part in delivering BT’s Simplify transformation. You’ll be designing and engineering the next generation of technology to support BTs new IT architecture. Founded on agile engineering, DevOps and cloud native principles these software platforms offer a full set of business capabilities across eCommerce, customer relationship management, quoting, product catalogue, orchestration, service assurance and IDAM.You’ll be focussed on developing API driven integrations for the new IT supported by Microservices to underpin core integration capabilities – building a standardised set of integration capabilities across the value and volume IT components.

You’ll be focussed on DevOps engineering best practice and build across SaaS vendor platforms as well as Cloud Native IaaS/PaaS built applications on our strategic Cloud Platforms. You’ll collaborate and engage with your value stream stakeholders to understand and interpret the priorities and work with value stream product owners to prioritise their demands into your backlogs. You’ll be the subject matter expert for API and Microservices driven Integration work.

Responsibilities:

• Creates and implements technical solutions for a domain or cross domains / portfolios of work within a specific technology area autonomously, understanding how solutions impact systems internally and/or externally and assessing impact of change.
  Delivers resolutions to problems that tend to be complex, cross-domain or of high impact to customers.
  Identifies opportunities to improve standards of practice within a project, continuously enhancing ways of working.
  Provides sound technical expertise to consult on significant component(s) of a technical solution within a specific domain or cross domain.
  Provides technical quality assurance over work of other engineers through matrix team structure.
  Accountable for design and delivery of the strategic Integration capabilities using Microservices and TMF open APIs where appropriate or BT defined open APIs as part of the Enterprise services/Integration squad.
  Responsible for software engineering Integration patterns across a wide variety of SaaS, IaaS and PaaS based applications.
  Leading a squad of cross functional developers and QA focussed on the build of strategic Integration capabilities using ReSTful API and Microservices.
  Accountable for cloud native deployment architecture for Integration components, with a focus on highly scalable and resilient architectures. 
  Create, maintain and regularly iterate a roadmap and backlog for Integration squad.
  Set-up operational monitoring and reporting with engagement from DevOps squad for new IT Integration stack.
  Regularly seek feedback from users and use the feedback, coupled with quantitative data to iterate rapidly.
  Responsible for unlocking and delivering benefits / efficiencies in the squad, with assistance of the squad members as required.

Skills:

• Architecture and solution design: skills in architecture definition and solutions design involving multiple components across architectural domains.
  Integration key areas: Knowledge of ReSTful API, Microservices, SOA web services, messaging and event driven architectures.
  Cloud : Good Knowledge and Work experience in AWS.
  API security aspects: Strong knowledge of authentication and identity related technologies and protocols is an advantage – e.g. OIDC, OAuth2
  Web technologies and containerisation: Java Spring, Docker, Kubernetes and with a heavy focus on automation and CI/CD practises.
  Agile software engineering: strong skills and experience building software in an agile team.
  User story decomposition and management ability to take a complex design and break down into features, stories and tasks – working with the Agile SCRUM team to ensure a quality backlog with well-defined acceptance criteria that can be engineered.
  Reflect and learn constantly, and have a growth mindset - Build, measure, learn
  IT experience of the Enterprise telco business with specialist knowledge in at least one of Fixed & Mobile products, networks, sales, service, marketing, digital experiences.
  Understanding of API and Data monetisation options
  Experience in Cloud Infrastructure as Code using Terraform and/or AWS CloudFormation would be ideal.
  Product owner certification
  TMF accreditations
  Cloud certifications such as AWS solutions architect

Benefits:

• Competitive salary
  25 days annual leave (plus bank holidays)
  10% on target bonus
  Life Assurance
  Pension scheme
  Direct share scheme
  Option to join the Healthcare Cash Plan or other benefits such as dental insurance, gym memberships etc.
  50% off EE mobile pay monthly or SIM only plans
  Exclusive colleague discounts on our latest and greatest BT broadband packages
  BT TV with TNT Sports and NOW Entertainment
  30% discount for friends and family on EE mobile pay monthly and SIM only plans

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.