Node.js/TypeScript Backend Engineer – Sainsbury’s DTD
About The Team
You’ll be part of the Martech engineering domain, an independent and empowered initiative created to address the rapid growth and complexity within the Customer & Data division. Martech brings together key products from Customer Decisioning (focused on customer data) and Customer Loyalty (supporting the Nectar brand), with a mission to build cross‑channel and cross‑brand marketing tools that enable data‑driven, world‑class customer experiences at scale. Within Martech, you will work in the MMH (Multichannel Messaging Hub) team. MMH orchestrates campaign delivery across email, push notifications, and personalised content, supporting all brands within the Sainsbury’s Group. The team consists of 7 engineers, a Product Manager, and an Engineering Manager, working collaboratively in an Agile (SCRUM) environment with a strong focus on communication, shared understanding, and continuous improvement.
About The Role
As a C4 Node.js Engineer, you will design and implement server‑side logic within a microservices architecture, contributing to the delivery of scalable, high‑performance services. You will work closely with cross‑functional stakeholders to define and refine solutions, taking ownership of shaping epics and breaking them down into actionable engineering work, including refining technical user stories, explaining requirements to the team, and ensuring alignment across stakeholders.
Technical Responsibilities
- Define technical solutions aligned with MMH team standards and Sainsbury’s engineering principles
- Design, build, test and deploy services and enhancements
- Ensure compliance with quality standards and successful production deployment
- Refine epics and technical user stories into clear and structured Jira tickets
- Liaise with stakeholders to clarify requirements and ensure shared understanding
- Communicate technical solutions clearly to engineers and non‑technical stakeholders
- Contribute to microservices‑based architectures supporting large‑scale datasets
- Integrate systems with APIs, event‑driven platforms, and third‑party services
Ways of Working
- Strong communication skills, engaging effectively with technical and non‑technical stakeholders
- Collaborative mindset, working closely with cross‑functional teams
- Comfortable working within SCRUM Agile methodologies and adapting to team practices
- Demonstrates empathy and supports team members to deliver effectively
About You
- Strong understanding of engineering principles and architectural best practices
- Comfortable owning and refining ambiguous problem spaces into structured engineering work
- Able to engage stakeholders, clarify requirements and translate them into actionable tasks
- Confident explaining technical concepts to a range of audiences
- Passionate about building scalable, high‑quality solutions
- Supports team delivery through collaboration, communication, and shared ownership
Essential Criteria
- Proficiency in JavaScript, TypeScript, and Node.js
- Experience working with microservices architecture
- Experience handling large‑scale datasets (millions of rows)
- Strong knowledge of REST, JSON and SOAP APIs
- Experience writing unit, integration and end‑to‑end tests
- Hands‑on experience with CI/CD pipelines (GitHub Actions)
- Experience using Git and GitHub
- Familiarity with Kubernetes
- Experience with AWS Serverless services and S3
- Infrastructure as Code using Terraform
- Experience with Snowflake
- Experience working with Kafka
- Knowledge of observability and monitoring tools such as NewRelic or Grafana
Desirable Criteria
- Familiarity with Salesforce Marketing Cloud and its APIs
- Familiarity with Coding Agent and AI‑driven development best practices
Location and Working Pattern
London‑based role. Flexible working approach combining remote and in‑office collaboration.
Benefits
- Colleague discount across Sainsbury’s, Argos and Habitat
- 10% side project / personal development time
- Generous holiday allowance with holiday buying scheme
- Bonus scheme – up to 10% of base salary
- Pension plan
- Access to discounts on gym memberships, restaurants, holidays and more
- Work‑life balance with flexible work arrangements
- Inclusive workplace with opportunities across teams
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