Resume

Zichen Liu

Senior Consultant · Full-Stack Engineer

zichen.liu.dev@gmail.com

Senior Consultant and full-stack engineer with 5+ years delivering enterprise systems and independently owned production platforms across Europe and APAC. Experience spans backend systems in C#/.NET, Java and Node.js; frontend applications with React, TypeScript, JavaScript and Redux; and cloud delivery across AWS and Azure.

AI-assisted changes remain subject to engineering review for correctness, security, test coverage and maintainability; current development focus includes agentic applications, RAG and evaluation.

Core Expertise

Languages: C# · Java · TypeScript · JavaScript
Frontend: React · Next.js · Redux · HTML · Responsive CSS
Backend: .NET / .NET Core · Node.js · Spring Boot · REST · Event-Driven Services
Cloud & delivery: AWS · Azure · Docker · Kubernetes · Terraform · CI/CD
Data & identity: DynamoDB · SQLite · OIDC / JWT · SSO
AI engineering: AI-Assisted Delivery · Generated-Code Review · Azure AI Speech · Agent / RAG Focus

Professional Experience

Thoughtworks

Senior Consultant · Full-Stack Engineer · Spain & China

Jul 2021 – Present

Delivered enterprise platforms across airline loyalty, business finance and healthcare, covering technical discovery, architecture, implementation, quality and production delivery.

easyJet

Loyalty Platform

United Kingdom

Led technical evaluation and selection of a loyalty management system, defining the integration approach across identity, data, dependent services and multiple delivery environments.
Implemented C#/.NET and AWS services behind shared adapter boundaries, securing repeatable multi-environment delivery with OIDC/JWT, Terraform, automated tests and CI/CD.

Philips

Hospital Shared Platform

Germany

Built a central event-notification service connecting hospital systems, providing a shared channel for real-time patient and emergency updates.
Introduced PactNet contract testing and integrated it into CI/CD, catching service-boundary incompatibilities earlier in the delivery workflow.

MYOB

Business Finance Management Platform

Australia

Implemented permission and usage-based billing services for subscription lifecycles, merchant accounts and product consumption, supporting scalable entitlement and charge processing.
Connected onboarding, account dashboards, invoice payment and real-time business APIs across frontend and backend services while decoupling user management for continued platform growth.

Delivery Principles

End-to-End Ownership: Problem framing and architecture through implementation, integration, release and production support.
AI-Assisted Engineering: AI accelerates exploration, implementation and testing; generated changes remain subject to engineer-owned review for correctness, security and maintainability.
Reliability by Design: Contract and end-to-end testing, idempotent workflows, bounded retries, infrastructure as code and recoverable operations.

Selected evidence

Systems owned beyond the ticket.

Independent deliveries covering product interfaces, backend services, integrations, security and production operations.

Selected Independent Projects

Dahua Event Registration & Engagement Platform

Independent End-to-End Delivery

Owned the seven-language Node.js/SQLite platform from interfaces and APIs through retry-safe email automation, calendar integrations, security, DNS and containerized production operations.

Designed, built and operated a secure seven-language registration platform unifying public registration, administration and restricted client workflows across Node.js APIs and role-specific interfaces.
Protected valid registrations from downstream email and API failures by modelling consent and integration state in versioned SQLite and implementing an idempotent transactional outbox for safe retries.
Automated five localized lifecycle emails, calendar actions and operational views, then established recoverable delivery with Docker Compose, Caddy/TLS, Cloudflare controls, health checks and backups.

Real-Time Bilingual Event Captioning Platform