Backend-focused full-stack engineer · Hanoi
Software engineer specializing in TypeScript, Node.js, distributed commerce systems, real-time applications, and infrastructure that survives real users.
Real-time collaboration · AI · Infrastructure
A collaborative platform where multiple users visualize and manipulate graphs together while interacting with AI agents.
Can you map this system flow?
Access updated. The workspace is ready.
I found the dependencies. Adding them now.
01
Heavy d3-force computations move through BullMQ workers, then flow back to every connected client through Socket.IO and Redis—keeping the interface responsive as the graph changes in real time.
More selected systems
Research prototypes and production-shaped systems across retrieval, optimization, realtime delivery, and operational workflows.
Recommender systems · Evidence-grounded AI
A movie and TV recommender that fuses ItemKNN, BM25, and popularity signals, then asks Gemini to explain its top results using only traceable user-history, metadata, and review evidence.
Engineering note88% source-supported explanation sentences in the 10-user smoke test, backed by citation validation and 66 deterministic tests.
Operations research · Dynamic optimization
A reproducible research system for routing UAV fleets under capacity, time-window, depot, and changing risk constraints, with static and rolling-horizon solvers.
Engineering noteBenchmarks ALNS, Contextual ALNS with LinUCB, and NSGA-III across static and dynamic Solomon-derived scenarios.
Async workflow · Full-stack
An end-to-end seller and admin workflow where uploads become BullMQ jobs, a rate-limited verification service processes them, and webhooks drive document status updates.
Engineering noteSeparates the API, queue worker, mock verification boundary, and role-specific React interfaces in a deployable monorepo.
Realtime systems · Go
A horizontally scalable leaderboard where score writes invalidate Redis caches, publish update events, and fan out live rankings to React clients over SSE.
Engineering noteKeeps score ingestion independent from delivery through clean domain ports, MongoDB adapters, Redis pub/sub, and an SSE broadcaster.
Rules engine · Operational workflow
A time-sensitive review service that turns shipment facts into tasks, escalations, deadlines, risk levels, and an ordered work queue with a complete audit trail.
Engineering noteSeven versioned, idempotent rules feed nine API workflows, backed by unit and end-to-end tests and a production-style task board.
Commerce, operations, and infrastructure—built around how teams and customers actually work.
NAILZY
Built and operated the backend behind a multi-tenant commerce platform for nail products in the US.
TELIO
Connected warehouse, delivery, finance, and search across Vietnam's largest B2B FMCG commerce platform.
HORUSOFTACEAE
Worked on a hospital organ-donation management application as part of a frontend intern team.
Cart, checkout, promotions, payments, warehouse, and order flows shaped by real operational constraints.
Kafka, SQS, CQRS, BullMQ, CDC, and dead-letter queues that keep services moving when dependencies fail.
Algolia, Elasticsearch, Socket.IO, and Redis for interfaces that respond while the underlying data changes.
AWS, Kubernetes, Docker, Terraform, CI/CD, and Datadog carrying products from commit to production.
About / Quan Le
HANOI, VIETNAMI turn them into systems that are observable, maintainable, and useful to real teams. I work mainly on backend architecture, but I am comfortable carrying a product through frontend integration and deployment.