Senior Software Development Engineer 3 (SDE 3) [Delivery Applications]

We are building one of the region's most ambitious e-commerce platforms: high-traffic, multi-region, and engineered for scale. As a Backend Engineer at Lulu, you will own critical systems that millions of customers depend on every day, from product discovery through to delivery. You define how systems are built, not just what gets built. You own multi-quarter, multi-team goals, drive technical strategy, and set the standard for engineering excellence within and beyond your team. ABOUT THE SQUAD The Delivery Applications squad powers everything that happens after a customer clicks 'Place Order'. We own the Delivery Promise Service, Warehouse Management System (WMS), and Transport Management System (TMS) — the backbone of Lulu's fulfillment operations. Our systems coordinate warehouse picking, packing, carrier allocation, and last-mile delivery to ensure customers get their orders on time. Core services: Delivery Promise Service, Warehouse Management System (WMS), Transport Management System (TMS) WHAT YOU'LL WORK ON Build and scale the Delivery Promise Service that calculates accurate delivery estimates based on inventory location, carrier capacity, and real-time logistics data Design and maintain WMS backend services for inventory tracking, pick-pack-ship workflows, and warehouse slot management Develop TMS components for carrier selection, route optimization, shipment tracking, and delivery status propagation Architect event-driven workflows using Kafka to coordinate handoffs between warehouse, transport, and customer-facing systems Build integrations with third-party logistics providers, carrier APIs, and last-mile delivery partners Implement resilient, fault-tolerant systems that handle high-volume order spikes during sales events and seasonal peaks Drive observability across the fulfillment pipeline with structured logging, metrics dashboards, and proactive alerting on SLA breaches

Desired Candidate Profile

WHAT WE'RE LOOKING FOR Scope & Impact Own and deliver multi-quarter, multi-team product or platform goals, defining technical solutions that level up the entire team Make independent technical decisions in the face of open-ended requirements, with a deep understanding of business context and customer needs Drive cross-team or cross-discipline initiatives, optimizing beyond your immediate team for broader organizational impact Technical Craft Design the software and systems in your area of ownership, ensuring they meet their design objectives and align with longer-term business needs Handle complex software modules that are logically dense — whether from business, idempotence, robustness, or scalability requirements Simplify code and infrastructure, prioritizing tasks that measurably reduce maintenance and migration costs Preemptively identify and resolve technical risks before they jeopardize projects; resolve cross-team dependencies early Debug and reproduce non-deterministic bugs and system issues that would normally escape less experienced engineers Champion an AI-first engineering culture — actively adopt and advocate for AI tools and assistants to maximize productivity, accelerate delivery, and multiply your team's impact Leadership & Strategy Define the technical roadmap for complex projects, provide leadership for those executing on it, and generate excitement for the team's strategy Set and hold the bar for quality and best practices via code and design reviews Act as a Culture Leader — partner with your manager to set the cultural tone, foster psychological safety, and champion inclusive practices Coach and mentor teammates, offering direct and actionable feedback delivered with empathy to help others grow into the next level Represent Lulu's mission, strategy, and technical challenges to candidates in a compelling way MUST-HAVE QUALIFICATIONS These are non-negotiable. We need engineers who can hit the ground running with our stack and ways of working. Strong proficiency in at least one backend language: Python, Java, or Node.js, with deep understanding of language internals and performance characteristics Proven track record of designing, building, and operating microservices architectures at scale in production Deep experience with cloud platforms (GCP, AWS, or Azure) including architecture decisions, cost optimization, and multi-region deployments Expert-level knowledge of containerization (Docker) and orchestration (Kubernetes) in production environments Strong experience with CI/CD pipelines, deployment strategies (blue-green, canary), and automated quality gates Advanced database

Skills

• query optimization, sharding strategies, replication, and data modeling for high-throughput systems Extensive experience with event-driven architectures and message brokers (Kafka, SQS/SNS, Pub/Sub) at scale Deep understanding of caching layers (Redis, Memcached, CDN) and their role in system performance and reliability Strong grasp of API security, OAuth 2.0, JWT, API gateway patterns, and WAF configurations Domain experience in e-commerce, retail, logistics, supply chain, or similar high-traffic consumer platforms — you understand the business domain, not just the technology NICE-TO-HAVE QUALIFICATIONS These will set you apart and accelerate your impact, but aren't required on day one
• Experience leading technical design reviews and architectural decision records (ADRs) for cross-team systems Track record of driving large-scale migrations, platform re-architecture, or system decomposition projects Hands-on experience with observability at scale: custom metrics, distributed tracing, SLO/SLI frameworks, and incident management Experience with infrastructure-as-code (Terraform, Pulumi) and platform engineering practices Background in high-stakes transactional systems: payment processing, order management, or warehouse/logistics platforms Public contributions: conference talks, technical blog posts, open-source maintainership TECH STACK Languages :Python (Django), Node.js, Java Architecture :Microservices, distributed systems, API-first Databases :PostgreSQL, MySQL Caching :Redis, Memcached, CDN (CloudFront, Fastly, Akamai) Cloud :GCP (GKE, BigQuery, Cloud Run), Azure, AWS Messaging :Kafka, AWS SQS/SNS, Google Pub/Sub, RabbitMQ Containers :Docker, Kubernetes CI/CD :Jenkins, GitHub Actions Observability :New Relic, ELK Stack, PagerDuty Security :JWT, OAuth 2.0, API Gateway, WAF OUR VALUES At Lulu, our values aren't wall decorations — they guide how we work, hire, and grow
• Be Customer Obsessed — Every decision in service of the customer's success
• Speak & Act Courageously — Challenge the status quo, take calculated risks, and advocate for new ideas
• Take Extreme Ownership — Nothing is someone else's problem
• Uphold excellence and accountability
• Learn Voraciously — Growth mindset, curiosity, and continuous improvement
• Move with Focus & Urgency — Identify the highest-impact work and move fast
• Win as One Team — Celebrate wins, lend a hand, and invest in each other's growth
• Employment Type Full-time

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