Senior Consultant · 5+ Years

Whole systems, end to end.

Full-stack delivery spanning C#/.NET, Java and Node.js backends; React, TypeScript, JavaScript and Redux frontends; and production infrastructure across AWS and Azure. AI-assisted changes remain subject to deliberate engineering review.

View selected workzichen.liu.dev@gmail.com
Based
Barcelona, Spain
Focus
Full-Stack · Cloud · AI-Enabled Delivery

Selected systems, owned end to end.

Event registration, live multilingual captioning and enterprise loyalty integration: three problem spaces connected by ownership of system boundaries, failure handling and production delivery.

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End-to-End Product Delivery

Event Registration Platform

Global video technology company

A seven-language registration journey had to preserve consent evidence, withstand downstream email failures and serve public, admin and client workflows. The resulting platform unified those paths with retry-safe communications and independently operable infrastructure.

RegistrationConsent + OutboxEmail + CalendarOperations
Ownership
Architecture · Frontend · Backend · Operations
Systems
Node.js · SQLite · Brevo Automation · Google Services
Production
Docker Compose · Caddy · Cloudflare · VPS
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Real-Time Multilingual Platform

Bilingual Event Captioning

Independent delivery

Live venue audio had to become simultaneous English and Simplified Chinese captions without coupling operator controls to audience displays. The delivered system separated control and read-only clients around an authenticated streaming path.

AudioEnglish / Chinese Source DetectionLive
SpeechAzure Translation + TerminologyStreamed
DisplayDedicated EN / ZH ClientsRead-Only
Stack
React · Node.js · Azure AI Speech · WebSockets
Interfaces
Operator Control · English Display · Chinese Display
Delivery
Docker Compose · Caddy · HTTPS
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Enterprise Platform Integration

Airline Loyalty Platform

European airline

An external LMS had to be evaluated and integrated across identity, multiple delivery environments and event-driven services without leaking vendor concerns into core domain logic. The approach combined shared adapters, secure access paths and repeatable infrastructure.

EvaluateIntegrateSecureOperate
Stack
C# · .NET · AWS · DynamoDB
Architecture
REST APIs · Lambda · SQS · Shared Adapters
Delivery
OIDC / JWT · Terraform · Automated Tests · CI/CD
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Senior Consultant · Full-Stack Engineer

Thoughtworks, Jul 2021 – Present.

Enterprise delivery across airline loyalty, healthcare and business finance, covering discovery, architecture, implementation, quality and production delivery.

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Product engineering through production operations.

The strongest fit is work with wide ownership boundaries across user experience, services, data, identity, cloud infrastructure and operational reliability.

Full-Stack EngineeringC# / .NET · Java / Spring Boot · TypeScript / JavaScript · React / Redux

Interfaces, APIs and domain services designed as one product system.

Cloud, Integration & DeliveryAWS · Azure · Docker · Terraform · SSO · APIs

Environment-aware integrations and repeatable delivery from local development through production operations.

AI-Assisted EngineeringAI-Assisted Delivery · Engineer-Owned Review

AI supports exploration, implementation and testing; generated changes are reviewed for correctness, security and maintainability.

Cloud credentials, independently verified.

AWS and Microsoft certifications supporting cloud architecture, administration and applied AI delivery. Each badge links to its public verification record.

AWS Certified AI Practitioner badgeAmazon Web ServicesAWS Certified AI PractitionerView CredentialAWS Certified Solutions Architect - Associate badgeAmazon Web Services Training and CertificationAWS Certified Solutions Architect - AssociateView CredentialMicrosoft Certified: Azure Administrator Associate badgeMicrosoftMicrosoft Certified: Azure Administrator AssociateView Credential

Experience, projects and engineering evidence.

5+ years of consulting across named enterprise engagements, independently delivered production platforms, certifications and education, with current AI work clearly separated from established delivery experience.

Current
Senior Consultant · Thoughtworks
Experience
5+ Years · Spain & China
Enterprise clients
easyJet · Philips · MYOB
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