Open to senior engineering and technical leadership positions
Lead engineering profile
Chay Kun Wai (Jacky)
Backend Lead Engineer & Technical Lead
Backend Lead Engineer and hands-on Technical Lead with 6+ years delivering Java-based enterprise systems and warehouse automation across Malaysia and China. Combines backend implementation and system design with on-site customer discovery, commissioning, code review, mentoring, and delivery coordination. Worked from Midea's China office and customer sites and independently delivered two customer-hosted systems.
Malaysia-based Open to relocate to Singapore Open to frequent worldwide travel
Professional experience
Engineering ownership from discovery to operational readiness
Direct employeeChina office and customer sites
Midea Group
Backend Lead Engineer (Technical Lead)
- Designed and implemented core Java and SQL system features while reviewing code and aligning contributors with shared engineering standards.
- Led backend design and delivery across concurrent warehouse automation programs, translating on-site customer workflows into SRS documents, technical designs, and implementation plans.
- Coordinated technical scope, engineering capacity, dependencies, and delivery risks with customer and internal stakeholders.
- Worked from Midea's China office and customer sites throughout the assignment, partnering directly with local stakeholders during discovery, implementation, and delivery readiness.
- Guided new engineers through warehouse-domain concepts, development setup, and delivery practices; participated in technical interviews.
Technology and domain: Java | SQL | Warehouse automation
Direct employeeMalaysia office and regional customer sites
Swisslog Malaysia Sdn. Bhd.
Software Application Engineer
- Built and maintained Java modules supporting receiving, putaway, cycle-count, inventory, and infeed/outfeed workflows across warehouse automation deployments.
- Led module delivery for anonymized beverage-manufacturing and secure-printing facilities, from requirements analysis through implementation and on-site commissioning support, including assignments in China.
- Owned test planning and defect investigation for deployments serving global retail customers, collaborating with engineering and site teams through production readiness.
- Mentored new engineers on development setup, warehouse fundamentals, debugging, and the software delivery lifecycle.
Technology and domain: Java | SQL | Oracle Database | SQL Server | Warehouse automation
Independent customer projects
Closed-source systems delivered end to end
Manual Warehouse Management System
F&B manufacturing warehouse (anonymized)
Independently built and commercially delivered a closed-source warehouse management system for an anonymized F&B manufacturing warehouse, covering receiving, picking, inventory allocation, shipping, and REST API integrations with upstream systems.
- Deployed the Java EE application on WildFly with PostgreSQL in the customer's server environment.
Stack: Angular | React | Java EE | WildFly | PostgreSQL
Dive Center Attendance and Billing System
Swimming and scuba-diving center (anonymized)
Independently built and commercially delivered a closed-source attendance and billing system for an anonymized swimming and scuba-diving center, covering student registration, attendance, bill and payment checks, and monthly and custom reports.
- Implemented the customer-facing workflows and deployed the system to the dive center's server for operational use.
Stack: Angular | React | Java EE | WildFly | PostgreSQL
Engineering delivery evidence
From backend implementation to customer readiness
Backend implementation
Design and maintain Java application modules for inventory and material-flow workflows backed by SQL databases.
Requirements and technical design
Translate customer workshops and warehouse workflows into SRS documents, system boundaries, technical designs, and implementation plans.
Testing and operational readiness
Plan functional tests, investigate defects, review code quality, and support commissioning into live warehouse operations.
Technical leadership and delivery coordination
Review code, mentor engineers, and coordinate capacity, dependencies, blockers, and readiness with customer and delivery teams.
Applied AI prototype
AI-Assisted WMS Troubleshooting Prototype
Internal prototype - not released
Designed a retrieval-augmented generation (RAG) assistant to make warehouse automation troubleshooting knowledge easier to access when inventory or process failures occurred.
Prototype V1
Ran a compact language model on a project server and used RAG to retrieve relevant workflow documentation and diagrams, suggesting where support engineers could begin an investigation.
Planned V2
Would extend retrieval to source-code context and read-only database queries so the assistant could narrow likely failure causes and provide diagnostic guidance without exposing proprietary code to end users.
Work concluded at prototype stage when the role ended; it was not released to customers or operated in production.
Role-relevant skills
Focused, interview-defensible strengths
Backend engineering
Data and runtime
System delivery
Technical leadership
Additional experience
Partnership and independent work
NetEase - Malaysia Market
External / KOL Partner | Remote
Conduct product research, market surveys, structured player interviews, and pre-release testing for game-network products in Malaysia.
Sirius Lab
Founder / Software Architect | Malaysia
Led product architecture and project-delivery oversight for a small independent software venture.
Education
Bachelor of Information Technology (Honours), Software Systems Development
Tunku Abdul Rahman College, Kuala Lumpur | 2020
Diploma in Information Systems Engineering, Computer Science
Tunku Abdul Rahman College, Kuala Lumpur | 2017
Languages
- EnglishFluent
- MandarinFluent
- CantoneseFluent
- MalayFluent
Beyond work
Advanced Open Water Diver with an interest in disciplined preparation, teamwork, and learning in unfamiliar environments.
Singapore opportunities
Open to senior backend, technical leadership, and customer-facing engineering roles.
For a role-aligned discussion, contact Jacky by email, LinkedIn, or WhatsApp.