Hi, my name is Tao (Simon) Cheng
I'm a Senior Java Backend Developer

Overview

A scalable banking deposit system, redesigned as Java microservices with event-driven architecture, core features: Save, Withdraw, Renew, Enquiry.

My Contributions

• Redesigned backend system to Java microservices, delivered architecture, sequence diagrams, workflows, and API specifications.
• Proposed and implemented a dual-phase sprint model, reducing rework caused by unclear requirements by 40%, improving design approval rates.
• Coordinated a cross-functional team of 6 members, facilitated daily meetings and unblock sessions.
• Designed an enquiry module with event-driven architecture, achieving response times under 200ms.

Tech Stack

Overview

A daily-use system for medical rep built with Spring Cloud. Core features: article sending and reading, with complex reverse-matching logic.

My Contributions

• Refactored a complex reverse-match function with 10+ undocumented legacy logic branches and poor maintainability. Led a gradual, risk-controlled refactor processusing XMind to map business logic and validate with stakeholders.
• Wrote comprehensive unit tests to ensure functional integrity after refactoring;
• Improved integration testing efficiency by ~30% through structured test data setup and teardown, ensuring isolation, consistency, and reliability.
• Rapidly fixed NPE production issue, delivered a hotfix with root cause analysis (RCA) and long-term data validation strategy.

Tech Stack

Overview

A high-availability system deployable across domains under regulatory environments, handling terabytes of data daily from over a hundred banks. Core features: data transfer between online (DB) and offline (SFTP/OSS),

My Contributions

• Independently developed a high-availablility File Platform System, supporting terabyte-scale daily data (e.g., payments, refunds, loans, fees) between Alipay, government, and hundreds of banks via DB↔SFTP, DB↔OSS.
• Applied Strategy and Factory design patterns to integrate multiple SDKs (e.g., DataWorks, DataPhin), improving system extensibility and maintainability.
• Proposed a decisive solution and architectural shift to the cross-domain deployment challenge with incompatible infrastructures (Alibaba, government, and banks); Designed a unified, multi-module, maven profile-based solution, enabling 0->1 and scalable 1->N scaling.
• Implemented a high-availability strategy to avoid external service failures, including rate limiting, circuit breaker with retry, asynchronous fallback handling, scheduled recovery, and real-time alerting.
• Built automated file comparison scripts, saving 2~3 hours of manual effort daily and enabling smooth production rollout.
• Enabled 60%+ of teams to automate data transfer, boosting productivity by ~20% by eliminating manual weekly handoffs.
• Resolved SDK delays by re-estimating tasks, escalating blockers with backup plans, and coordinating stakeholder meetings to negotiate phased delivery, ensuring project continuity.

Tech Stack

Overview

A configurable insurance portal system. Core features: policy confirmation, image upload, facial recognition, and claims processing.

Tech Stack

Overview

A high-throughput promotion system supporting 320,000 QPS peak load, using JVM tuning, batch processing, asynchronous calls, and interface degradation strategies to maintain fast, reliable responses under heavy user traffic.

Tech Stack

Overview

A simulation project developed independently with production-level standards, demonstrating my capability to build extensible, fault-tolerant, and concurrency-safe backend systems under high-load conditions.

Tech Stack