Senior Software Engineer (App Integration)

We are building a new marketplace platform to modernize how we process orders across multiple sale channels. The platform replaces a legacy monolithic system with purpose-built services for channel integration and order fulfillment.

As the **Senior Software Engineeer **, you will own the technical direction and delivery of this platform from day one. You will lead a dedicated build team through the initial delivery, then evolve into leading two permanent squads as the team converges with the existing marketplace team.

This is a dual-track role: you will drive a greenfield platform build while maintaining oversight of a legacy system during a parallel migration period. You will also pioneer AI-native development practices, using AI pair programming as a core part of the team’s workflow.

What You'll Do

Technical Leadership

• Design and review event-driven distributed systems across platform services
• Define API contracts, messaging topology (SNS/SQS), and database schemas (PostgreSQL)
• Establish architecture patterns: adapter-based channel integration, state machine-driven fulfillment workflows, DLQ handling
• Evaluate and review AI-generated code critically — ensuring quality, security, and maintainability
• Own technical decision-making for the platform, balancing speed with long-term maintainability

Delivery & Process

• Lead end-to-end platform delivery from design through production go-live
• Run tight sprint cadences with clear goals and retrospectives
• Establish code review standards, CI/CD pipelines, and deployment practices
• Set up on-call rotations, incident response processes, and runbook documentation
• Coordinate knowledge transfer from the existing team during the build phase

People & Growth

• Build and lead the new platform team from onboarding through production delivery
• After go-live, lead the convergence of the new and existing teams into two purpose-built squads
• Mentor existing .NET developers transitioning to the TypeScript stack
• Span both squads long-term, providing architectural oversight across the domain

Requirements

Must Have

• 6+ years of backend engineering experience, with 2+ years in a tech lead or senior architect role
• Strong proficiency in TypeScript and Node.js
• Deep experience with event-driven architectures: message queues (SQS, SNS, Kafka), async workflows, idempotency patterns
• Production experience with AWS services: EKS/Kubernetes, Aurora/RDS (PostgreSQL), ElastiCache (Redis), SQS/SNS
• Experience designing and operating distributed systems with proper observability (structured logging, distributed tracing, dashboards)
• Proven ability to run agile delivery: sprint planning, backlog management, retrospectives
• Strong code review culture — can review PRs for correctness, security, and design quality

Nice to Have

• Familiarity with .NET 6 / .NET Framework (for legacy oversight during migration)
• Experience with AI pair programming tools (Copilot, Claude, Cursor) and AI-native development workflows
• Experience migrating systems from monolith to microservices
• Contract testing experience (Pact or similar)
• Experience integrating with third-party marketplace APIs (e.g., Shopee, Lazada, Grab, or similar)

Tech Stack

• **Backend **- TypeScript, Node.js
• **Database **- PostgreSQL (Aurora), Redis (ElastiCache)
• Messaging - Amazon SQS, SNS, with DLQ patterns
• **Infrastructure **- AWS EKS (Kubernetes), Terraform, GitHub Actions CI/CD
• **Observability **- Datadog (tracing, logging, dashboards, alerting)
• Frontend (Packing UI)- React, Vite, TypeScript
• Legacy (oversight)- .NET 6, .NET Framework 4.7.2, SQL Server, MongoDB