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I am a backend engineer specializing in designing scalable systems and optimizing performance for millions of users. I excel in microservices, distributed architectures, and building AI-powered SaaS platforms. I love tackling complex problems with innovative solutions, integrating third-party APIs, and delivering robust backend services. I thrive in cross-functional teams and enjoy turning data-driven insights into practical applications.…I am a backend engineer specializing in designing scalable systems and optimizing performance for millions of users. I excel in microservices, distributed architectures, and building AI-powered SaaS platforms. I love tackling complex problems with innovative solutions, integrating third-party APIs, and delivering robust backend services. I thrive in cross-functional teams and enjoy turning data-driven insights into practical applications.

Han Sheng Liang

Full Stack Developer, AI Engineer, Back-End Developer, +4

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I am a backend engineer specializing in designing scalable systems and optimizing performance for millions of users. I excel in microservices, distributed architectures, and building AI-powered SaaS platforms. I love tackling complex problems with innovative solutions, integrating third-party APIs, and delivering robust backend services. I thrive in cross-functional teams and enjoy turning data-driven insights into practical applications.…I am a backend engineer specializing in designing scalable systems and optimizing performance for millions of users. I excel in microservices, distributed architectures, and building AI-powered SaaS platforms. I love tackling complex problems with innovative solutions, integrating third-party APIs, and delivering robust backend services. I thrive in cross-functional teams and enjoy turning data-driven insights into practical applications.

Available to hire

I am a backend engineer specializing in designing scalable systems and optimizing performance for millions of users. I excel in microservices, distributed architectures, and building AI-powered SaaS platforms.

I love tackling complex problems with innovative solutions, integrating third-party APIs, and delivering robust backend services. I thrive in cross-functional teams and enjoy turning data-driven insights into practical applications.

Skills

Experience Level

Expert

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Language

English

Fluent

Malay

Fluent

Work Experience

Senior Back-End Engineer at MMIVIP

October 1, 2024 - October 8, 2025

Developed 3+ AI-driven SaaS platforms supporting voice agents, integrating OpenAI, ElevenLabs, Twilio, and Stripe; handled 10,000+ daily API calls with <300ms latency; architected scalable back-end services in Express.js, Go, and GraphQL; consolidated 5+ AI microservices into a unified Rails backend, reducing infrastructure costs and improving maintainability; implemented Retrieval-Augmented Generation (RAG) & Google Search API for AI agents, increasing accuracy and reducing response time; deployed AWS infrastructure (EC2, Lambda, RDS, S3) ensuring high uptime; optimized real-time data pipelines using Redis & WebSockets; automated AI voice agent workflows using Vapi, n8n, Synthflow; led cross-functional collaboration with AI/ML, frontend, and DevOps teams.

Lead Back-End & AI/ML Engineer at Arkmind

August 1, 2023 - October 8, 2025

Led a team of 5 engineers in designing and deploying a Loan Origination System (LOS) & Loan Management System (LMS), reducing loan approval times by 65% and processing $50M+ in loan volume annually. Architected high-performance back-end services in Express.js and GraphQL, improving API response times by 40% and supporting 5,000+ concurrent users with OAuth 2.0 security. Integrated AI/ML models (TensorFlow, OpenAI, NLP) to automate credit risk scoring & fraud detection, increasing approval accuracy by 30% and reducing defaults by 19.9%. Optimized AI inference on edge devices using NVIDIA Jetson for real-time decision-making in loan processing. Containerized services with Docker & Kubernetes, reducing deployment time by 50% and improving CI/CD efficiency.

Junior Front-End Developer Intern at Arkmind

July 1, 2022 - October 8, 2025

- Built responsive, accessible UIs with React.js, TypeScript, and CSS3 - Improved Lighthouse scores for SEO and accessibility. Optimized web performance with code-splitting, lazy loading, and memoization, reducing page load time. - Integrated RESTful APIs to power real-time dashboards, handling 1,000+ dynamic data requests/day with efficient state management. - Containerized front-end apps with Docker to streamline CI/CD, and collaborated with UX/UI designers to implement pixel-perfect, mobile-first designs.

Senior Software Engineer at WorkforceMentor (PromentraAI)

September 1, 2025 - Present

Engineered a RAG-based mentoring system using Pinecone, LangChain, and LangGraph; developed long-term and short-term memory management for AI coaches; built function/tool-calling agents for triggering real-world actions; implemented FastAPI endpoints with async processing via RabbitMQ and Redis; optimized real-time data pipelines with Redis and WebSockets; created a responsive Next.js dashboard for employees and an Angular admin panel for training managers; integrated Google Calendar, AWS S3, and SendGrid for assets and notifications.

Senior Software Engineer at Fathom

February 1, 2025 - August 1, 2025

Developed a bot-free recording system for virtual conferences supporting multiple platforms; launched a proof of concept within three months; managed multiple Golang-based microservices and unified the backend with Ruby on Rails; upgraded the Electron/macOS desktop app; implemented AI features including diarization and speech-to-text; built a user status detection system with high accuracy.

Senior Back-End Engineer at MMIVIP

September 1, 2023 - October 1, 2024

Developed 3+ AI-driven SaaS platforms with voice agents; integrated OpenAI, ElevenLabs, Twilio, and Stripe; handled 10,000+ daily API calls with sub-300ms latency; architected backend services in Express.js, Go, and GraphQL; consolidated 5+ AI microservices into a Ruby on Rails backend; implemented RAG & Google Search API; deployed AWS cloud infrastructure ensuring high uptime; optimized real-time data pipelines with Redis & WebSockets; automated AI voice agent workflows.

Staff Software Engineer at Loom

February 1, 2022 - August 1, 2023

Led backend and mobile development for AI-powered features (Auto Titles, Auto Summaries, Auto Chapters) using NLP and video metadata analysis; architected scalable pipelines for AI-driven video processing; developed internal backend libraries to streamline video processing and integration of AI features.

Hybrid AI Engineer at Skymind

September 1, 2021 - December 1, 2021

Contributed to open-source ClassifAI labeling tool; built MVP for a video annotation module with bounding boxes and segmentation; involved in AI-driven video processing pipelines and related projects such as Vpass.