Senior Full-Stack Engineer

Alex Chen

Building scalable full-stack systems and AI-powered products. Currently at Mammoth Cyber.

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Alex Chen
About me

Full-stack engineer.
AI systems builder.

6+ years of cross-domain experience across frontend, backend, and AI. Currently a Senior Software Engineer at Mammoth Cyber (US), where I lead large-scale migrations, design microservices architecture, and build AI browser automation systems. I embrace AI-native development workflows and care deeply about performance, type safety, and maintainability.

Tech Stack

Tools I work with

Frontend
ReactNext.jsRemix.jsVueAngularTypeScriptReact NativeFlutterModule Federation
Backend
Nest.jsExpressFastAPISpring BootASP.NET CoreGraphQLPostgreSQLMySQLRedisRabbitMQTypeORMPrisma
Cloud & AI
AWSDockerGitHub ActionsJenkinsLangChainFAISSAWS BedrockLangSmithJestPlaywrightZod
Selected Work

Projects

Career

Experience

Feb 2024 — Present
Senior Software Engineer
Mammoth Cyber — Led migration of 150+ API endpoints from AWS Lambda to Nest.js (150% perf gain) and progressive Vue → Remix.js frontend migration. Designed microservices + BFF architecture, GraphQL API, multi-layer caching (Redis / CDN), and production observability (CloudWatch, Sentry). Architected AI browser automation system with multi-agent orchestration (LangChain / ReAct), FAISS RAG pipeline, CDP integration, and AWS Bedrock Guardrail.
Jul 2022 — Feb 2024
Full-Stack Engineer
Trend Micro — Developed telecom security product with SIM-card whitelist enforcement and SIM-swap detection. Built JWT/OAuth2 Token Exchange Service bridging modern auth with a legacy system. Led Module Federation micro-frontend integrating 3 independent apps. Introduced RabbitMQ async processing (fire-and-forget + DLQ), improving API response speed by 120%.
Apr 2021 — Jun 2022
Software Engineer
Lianke Tech — Built KYC and AML compliance features for a crypto exchange using Spring Boot + JPA. Integrated TRM Labs for regulatory compliance, supporting liveness detection and multi-country identity verification. Led Angular → Next.js migration enabling shared hooks with React Native.
Apr 2020 — Apr 2021
Software Engineer
HP — Built ERP system with ASP.NET Core + Clean Architecture for ~1,000 global users. Delivered a visual query builder letting PMs query inventory without SQL. Collaborated with AI engineers to ship an internal Help Desk chatbot (Azure Bot Framework + LUIS) used company-wide.
Jul 2017 — Jul 2019
R&D Administrative Assistant (Internship)
Microsoft Taiwan — Developed an API management platform PoC with ASP.NET Core MVC + Identity Server that was adopted as a sales demo. Participated in a microservices migration for Cathay Bank. Built mobile and web banking features for a Taiwanese bank using Angular.