YL.

Yingchen Liu

Senior Full-Stack & AI Engineer
•
10+ years
•
System Design, AI Products, Web, Backend, Cloud, iOS & Android

System-design-led engineer who turns vague product requirements into clear architecture, explicit trade-offs and reliable delivery plans across web, mobile, backend and cloud. Practising AI-assisted engineering since late 2025, from Cursor and Claude Code to Codex agent teams.

EXPERIENCE

Senior Full-Stack Engineer
- Remote, Australia
Jan 2025 - Jul 2026
Xmind
  • Led development of Mapify, turning product requirements into system boundaries across search, summarisation, data migration, growth and release; matured vibe coding with Cursor and Claude Code into implementation inside documented architecture, review and release guardrails.
  • Designed full-text search and balanced migration speed against release risk with an S3-to-PostgreSQL index rollout, fallback behaviour and no hard cut-over.
  • Built Mapify's multilingual email and affiliate-settlement systems, and cut FCP from 11.6s to 1.1s and LCP from 22.1s to 7.6s for a product trusted by 5M+ users.
  • Led development of Henri, turning the open-ended promise of teaching any topic into an AI product built using AI and a proving ground for engineered vibe coding, from behavioural specs and design rules through testing, TestFlight and production.
Senior Software Engineer
- Remote, Melbourne
Jun 2022 - May 2024
Aimi.fm
  • Led the system design and delivery of a portable C++ generative-music engine and cross-platform SDK used by Aimi Player and Aimi Studio, spanning TypeScript, Node.js, Android and iOS while reducing startup time by 52%.
  • Deployed a scalable music streaming backend and maintained AWS infrastructure using Docker, Terraform, and GitHub Actions. Improved the build flow, reducing service build time by 30 seconds.
  • Engineered responsive web applications with TypeScript, React, Next.js with GraphQL and DynamoDB. Deployed on Vercel.
  • Achieved 96% test coverage by implementing test-driven development within the team.
Software Consultant
- Hybrid, Melbourne
May 2021 - Jun 2022
Cognizant Servian
  • Optus: led discovery across ambiguous stakeholder needs, security, budget and risk, then turned the constraints into a secure GCP/Kubernetes architecture and delivery plan.
  • Airtasker: built Kotlin/Spring services and Android workflows that cut load time by over 50% and improved retention by 17%.
  • Lendlease: delivered a Python/Vertex AI classification workflow that replaced manual work previously handled by 30 staff.

CONTRACT WORK

Independent Software Contractor
- Weekend Contracting, Remote, Melbourne
Jun 2024 - Dec 2024; Aug 2026 - Present
  • AxIT iOS: build and modernise AxIT with Swift and SwiftUI, bringing its connected assessment, Bluetooth, sync, reporting, accessibility and release workflows to iPhone and iPad.
  • Cross-platform metrics: contribute AxLib's shared Kotlin Multiplatform models, capability rules, sampling and metrics as one calculation contract across iOS, Android, Connect web and backend services.
  • AI-assisted metric review & QA: apply engineered vibe coding through Codex agent teams and isolated worktrees to evolve de-identified trace exploration and SBN Testing's exact-build workflows for algorithm review and app-behaviour testing with auditable evidence.

EARLIER EXPERIENCE

Full-Stack Developer
- Hybrid, Melbourne
Jun 2018 - Apr 2021
Strength By Numbers
  • Designed and developed the original AxIT Android app in Java, managing complex multi-threaded and asynchronous Bluetooth operations using ReactiveX.
  • Built backend microservices using JavaScript, Node.js, Express.js and MongoDB, deployed on AWS, supporting over 700 physio/fitness centres.
  • Developed Single Page Applications with React and Redux.
Full-Stack Developer
- Part-Time, Hybrid, Melbourne
Sep 2016 - May 2018
SensiLab
  • Designed and developed full-stack web applications using React, Redux, Express.js, MongoDB and Firebase.
  • Developed an iOS app using Swift.
  • Optimised SensiLab's WordPress website and created custom themes and plugins.

EDUCATION

Master of Information Technology
- Melbourne, Australia
2016 - 2017
Monash University
  • Dux of Postgraduate Information Technology Award.
  • International Merit Scholarship, and Winter Research Scholarship.
  • Achieved the highest grade in 4 subjects: programming, distributed systems, mobile and advanced mobile.

CERTIFICATION

AWS Certified AI Practitioner
Sep 2025
Amazon Web Services · Credential 39dc5a7281c84b11afbe44ba72164274

SKILLS

  • Core strengths: system design, problem framing, architectural trade-offs, cross-platform architecture, search and data systems, connected-device platforms and evidence-led delivery
  • AI-assisted engineering: Cursor, Claude Code and Codex agent teams; project instructions, behavioural specifications, reusable skills, isolated worktrees and verification gates
  • Languages: JavaScript (ES6), TypeScript, Java, Kotlin, Swift, Python, C, C++
  • Frameworks: React, Redux, Node.js, Next.js, Nest.js, Express.js, Vue.js, Spring Boot
  • Databases: MySQL, PostgreSQL, DynamoDB, MongoDB, Neo4j, Redis, Firebase
  • Cloud: AWS, GCP, Kubernetes, API Gateway, Lambda, Message Queue, S3, Vercel
  • AI & observability: AI SDK, LLM APIs, SSE, Prometheus, Vertex AI, Dialogflow
  • Tools: Docker, Terraform, GitHub Actions, CI/CD, TestFlight, Jira, Bash