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Software Development Engineer III - Online

Job Reference tesco/TP/11739132/761333

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GB Head Office

What’s in it for you

We offer excellent benefits that help make Tesco a great place to work.  These include but aren’t limited to: 

  • Annual bonus scheme where you can earn up to 15% of base salary 

  • Holiday starting at 25 days plus a personal day (plus 8 Bank holidays) 

  • On-site state of the art gym at our Welwyn Campus with discounted “Gympass” membership & free health checks via Nuffield Health 

  • Retirement savings plan - save between 4% and 7.5% and Tesco will match your contribution 

  • Life Assurance - 5 x contractual pay 

  • Share Schemes – Join our ‘Buy As You Earn’ & ‘Save As You Earn’ share schemes after 3 months service 

  • Colleague Clubcard (including a 2nd card for a family member) after 3 months service 

  • Colleague Discounts: 

  • 10% increasing to 15% after every pay day for a four day period, off most purchases at Tesco (from April 2020) 

  • 10% off One Stop 

  • 10% off pay monthly & SIM only deals with Tesco Mobile 

  • 20% off all F&F purchases 

  • 20% off car, pet and home insurance at Tesco bank. T&C’s apply 

  • 25% off Tesco Café 

  • 50% off complete glasses purchases & free eye tests (other offers available) at Vision Express 

  • 50% off health checks at Tesco Pharmacy 

  • An exclusive deals and discounts website saving you money on everyday purchases, treats for the family, eating out and utility bills for the home 

  • Cycle to work scheme 

  • Shuttle Bus Service to/from Hatfield & Welwyn Garden City Station to Welwyn Campus & Hatfield Offices 

  • Opportunities to get on - take advantage of our ongoing learning opportunities and award-winning training, to help you achieve the job and career you want 

  • Our Employee Assistance Programme helps you deal with life’s challenges 

  • Financial wellness - Tesco has partnered with experts to help you make the most of your money 

  • Get involved in a range of fundraising activities with our long-term charity partners 

About the role

If you are passionate about the culture of Agile software development leveraging continuous integration and deployment we'd love to hear from you.

Your proficiency with foundational computer science and software engineering concepts is taken as a given, and you will have significant technical depth and breadth. You will be playing an active role in technical leadership, with a proven impact across teams and the wider directorate.

You will participate in activities that build capability across the organization: coaching and mentoring of existing colleagues, and interviewing/hiring of new colleagues. 


You will be responsible for


Knowledge and ability to translate requirements into code and tests, using suitable paradigms and techniques. Understanding and optimizing the complexity, maintainability and security of code produced

  • Knowing what is the scope of a solution design
  • Writing easily readable, maintainable and clean code using Python/Shell Scripts
  • Understanding one programming language preferably Python
  • Advanced understanding of shell scripting
  • Having advanced understanding of the IDE ecosystem for the language
  • Being aware of the semantics & best practices of a given language
  • Having a deep understanding of infrastructure
  • Debug and resolve issues
  • Practicing test-driven development, and come up with possible test cases
  • Knowing what the common vulnerabilities associated with the relevant language and framework are and having a basic grasp of secure coding
  • Understanding the basics of credential management (e.g. where and how they should be stored)
  • Being aware of the fundamentals of secure communication (e.g. https)


Having advanced knowledge of the platform the application operates on (e.g. containers, linux, browsers)

  • Having an ability to design and create infrastructure solutions
  • Knowing about the purpose of different environments (dev/ppe/prod)
  • Knowledge of the differences between physical and virtualized resources
  • Knowing how to operate in a public cloud infrastructure environment
  • Managing complex workloads via container orchestrators
  • Knowledge of network protocols and how they work in detail
  • Autoscaling to handle high volume of traffic through the day
  • Effective traffic management
  • Edge caching to help serve our customers, suppliers, colleagues and the planet a little better every day


  • Helping to respond to live incidents
  • Recognising the importance of project instrumentation (e.g. logging & monitoring)

You will need

  • Programming in Python
  • Advanced Shell Scripting skills
  • Use Tools like Terraform and GitHub Actions
  • Worked with public cloud providers like Azure
  • Expertise with Kubernetes, AKS working at scale
  • Traffic management via Application Gateways, Ingress Controllers
  • Having an appreciation of availability and scaling methods and how they are achieved in the context of the application including understanding of HPA or Keda
  • Using DevOps orchestrators like Azure DevOps to Orchestrate DevOps Solutions
  • Setup, Configure and manage caches like Redis/Varnish and help optimize caching
  • An awareness of different communication layers used by the application
  • Taking a holistic view of systems to ensure they meet relevant security standards
  • Manage and protect secrets using Key Vaults like Azure Key Vault, Hashicorp Key Vault
  • Selecting relevant metrics, data points, alerts to support operation of systems and implementing observability using tools like NewRelic One or AppDynamics
  • Demonstrated experience designing, developing and running highly-scalable distributed systems
  • Experience implementing a range of design and architecture patterns
  • Able to decide between managed and self-managed services
  • Capable of driving the technical response to significant and major incidents
  • Coaching, supporting and mentoring other members of the team

About us

  • We are building systems to solve real world problems at scale, impacting tens of millions of people 

  • Teams of great Engineers (and Managers and Product Managers) to learn from 

  • We are agile and enlightened in our approach to building software and teams 

  • There’s a great atmosphere and we work sustainably as a team 

  • Tesco has a “do the right thing” mentality 

  • We promote flexible working 


We are proud to have an inclusive culture at Tesco where everyone is welcome and truly feels able to be themselves. At Tesco, we not only celebrate diversity, but recognise the value and opportunity it brings to enable us to serve our shoppers a little better every day. We strive to create a workforce that reflects our customers not only here in the UK, but worldwide. Our aim is to attract and welcome a diverse range applicants from all walks of life, offering many varying working patterns across our business, and we would love to hear from you!