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Walmart Canada · 1 day ago

Principal Software Engineer – Marketplace Platforms

Sunnyvale, CA

Full-time

Onsite

Senior Level, Lead/Staff

$143K/yr - $286K/yr

5+ years exp

Walmart Canada is seeking a Principal Software Engineer to lead the design and development of enterprise-scale Marketplace platforms. This role involves building high-throughput systems for seller onboarding, catalog management, and real-time transactions using advanced technologies such as Java, Kafka, and Big Data frameworks.

DeliveryRetailShopping

Responsibilities

You will serve as a technical authority responsible for building high-throughput, low-latency systems that power marketplace growth at massive scale

Architect and build distributed marketplace services for seller onboarding, catalog, pricing, inventory, and order flows

Design event-driven and streaming architectures using Apache Kafka for real-time marketplace signals

Develop and optimize Java-based microservices using Spring / Spring Boot

Build high-volume data pipelines using Big Data frameworks (Spark, Hadoop, Flink) for analytics and ML

Enable AI/ML use cases such as fraud detection, pricing optimization, seller scoring, and recommendations

Lead system design reviews, performance tuning, and scalability planning

Define engineering standards for resiliency, observability, CI/CD, and operational excellence

Mentor senior engineers and influence platform-wide architectural decisions

Partner with product, data science, infrastructure, and security teams

Qualification

JavaDistributed systemsApache KafkaBig Data technologiesMicroservicesSQL databasesNoSQL databasesCloud-native developmentKubernetesDockerAI/MLSystem designPerformance optimization

Required

10+ years of software engineering experience in large-scale systems

Expert proficiency in Java with strong knowledge of concurrency and multithreading

Deep experience building distributed, highly available systems

Hands-on experience with Apache Kafka (topics, partitions, offsets, schema evolution, exactly-once semantics)

Experience with Big Data technologies: Spark (batch & structured streaming), Hadoop ecosystem (HDFS, Hive, YARN), Flink or equivalent stream-processing engines

Strong experience with microservices, REST/gRPC APIs

Proficiency with SQL and NoSQL databases (MySQL, PostgreSQL, Cassandra, MongoDB, etc.)

Strong system design, troubleshooting, and performance-optimization skills

Option 1: Bachelor's degree in computer science, computer engineering, computer information systems, software engineering, or related area and 5 years' experience in software engineering or related area

Option 2: 7 years' experience in software engineering or related area

Preferred

Marketplace, e-commerce, payments, or supply-chain platform experience

Cloud-native development on AWS, GCP, or Azure

Experience with Kubernetes, Docker, and service mesh

Experience handling millions of sellers, SKUs, and transactions

Familiarity with ML platforms, feature stores, or real-time inference

Experience with observability tools (Prometheus, Grafana, ELK, OpenTelemetry)

Strong understanding of security, data governance, and compliance

Master's degree in computer science, computer engineering, computer information systems, software engineering, or related area and 3 years' experience in software engineering or related area

Knowledge in implementing Web Content Accessibility Guidelines (WCAG) 2.2 AA standards, assistive technologies, and integrating digital accessibility seamlessly

Knowledge of accessibility best practices