The Walmart eCommerce Family of Brands - Software Engineer

Imagine working in an environment where one experiment can catapult an entire industry toward a smarter future. That's what we do at Walmart Labs. We're a team of 5,000+ software engineers, data scientists, designers and product managers within Walmart, the world's largest retailer, delivering innovations that improve how our customers shop and our enterprise operates.

About the Job

Our high-volume inventory system tracks the available quantities of all our items of sale, known as stock-keeping units (SKUs). We cover, Walmart owned warehouses and all our partner merchant warehouses, along with quantities reserved from in-flight orders.

Customers expect that the availability of an item for sale is a true and accurate representation of what that retailer can fulfill. The Unified Inventory system's purpose is to ensure that this expectation is met. As Walmart builds deeper and richer digital experiences with its customers, this expectation becomes more complex, and it is the role of the Unified Inventory team to abstract away this complexity for downstream systems.

Our Engineers get challenged building systems which handle billions of events daily. The platform is an event driven (event sourced) system built largely in .NET and designed to run in the cloud (Azure) via a microservice architecture. The bulk of backend code is written in F# and our system of record is an event sourced system (essentially a log of all actions on the platform).


We need help in solving hard engineering and computer science problems for a world class eCommerce platform.

Your main goals are to:

  • Power both Jet and Walmart online, handling billions of events daily.

  • Maximize on-site availability while minimizing reject rates due to lack of inventory.

  • Give more insight to our marketing and operations teams via more historical data and improved analytics.

  • Unify inventory management responsibilities currently spread across multiple systems and teams.

  • Debug production issues with other teams across services and multiple levels of the stack.


  • Top-notch programming skills, with an interest in functional programming languages.

  • Strong interpersonal skills. Our Engineers are highly collaborative, and we are looking for people who can work effectively in small, close-knit teams.

  • Solid understanding of designing, developing and supporting large scale, cloud based distributed systems.

  • Exposure to event based and asynchronous processing.

  • Strong operational excellence and testing skills.

  • Someone who values automation. We don't like solving the same problem manually over and over.

  • Experience working with NoSQL databases.

  • Comfortable taking part in the (daytime only) on-call rotation.

Nice to Have

  • Fluent in a few programming languages, functional, dynamic and static.

  • Solid understanding of how to use data structures to solve problems optimally.

  • In depth knowledge of runtime and space complexity of data structures and the proposed solution.

  • Good understanding of event-driven systems.

  • Experience with Apache Kafka or similar streaming platform.

  • Comfortable working in a .NET and Azure environment.

  • Understands DevOps: how to support large scale distributed systems, how to prioritize and escalate issues.

  • Experience with Machine Learning and Scala.

The perks

Health & Wellness: Healthy snacks, pick your own fitness, in-house yoga classes, games room, relaxation room, wellness events.

Comprehensive Benefits: Pension plan, full medical insurance – family plan (with dental and vision), life insurance, Equity, Annual reviews and bonus.

Minimum 5 Weeks Vacation & flexible time: Take a break and detach. We mean it!

Events & Education: Training budget, tech meet-ups, parties and milestone celebrations, continued learning, hard and soft skills training, travel opportunities. Join us at our next event: ( )

All this and more: Modern office in Dublin City Centre with standing desks and whiteboard walls, stocked kitchen with free snacks and regular team lunch/happy hours, secured bike parking, showers, bike-to-work scheme, tax-saver commuter ticket system, discounts etc.