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Full-stack engineer shipping production systems, now focused on building and deploying AI agents and LLM-powered workflows end to end. Built and shipped a Retrieval-Augmented Generation (RAG) helpdesk assistant, an LLM/agentic web app for parsing unstructured appliance data into cost estimates, and a GraphRAG system for natural-language querying of power grid data — all taken from prototype to production, solo. Comfortable owning a system from algorithm research through IoT/data pipelines to deployment, and working directly with product and operations teams to decide what's worth automating.…Full-stack engineer shipping production systems, now focused on building and deploying AI agents and LLM-powered workflows end to end. Built and shipped a Retrieval-Augmented Generation (RAG) helpdesk assistant, an LLM/agentic web app for parsing unstructured appliance data into cost estimates, and a GraphRAG system for natural-language querying of power grid data — all taken from prototype to production, solo. Comfortable owning a system from algorithm research through IoT/data pipelines to deployment, and working directly with product and operations teams to decide what's worth automating.

Sebastian Ma Lik Keung

Full Stack Developer, Software Engineer, AI Engineer, +3

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Full-stack engineer shipping production systems, now focused on building and deploying AI agents and LLM-powered workflows end to end. Built and shipped a Retrieval-Augmented Generation (RAG) helpdesk assistant, an LLM/agentic web app for parsing unstructured appliance data into cost estimates, and a GraphRAG system for natural-language querying of power grid data — all taken from prototype to production, solo. Comfortable owning a system from algorithm research through IoT/data pipelines to deployment, and working directly with product and operations teams to decide what's worth automating.…Full-stack engineer shipping production systems, now focused on building and deploying AI agents and LLM-powered workflows end to end. Built and shipped a Retrieval-Augmented Generation (RAG) helpdesk assistant, an LLM/agentic web app for parsing unstructured appliance data into cost estimates, and a GraphRAG system for natural-language querying of power grid data — all taken from prototype to production, solo. Comfortable owning a system from algorithm research through IoT/data pipelines to deployment, and working directly with product and operations teams to decide what's worth automating.

Available to hire

Full-stack engineer shipping production systems, now focused on building and deploying AI agents and LLM-powered workflows end
to end. Built and shipped a Retrieval-Augmented Generation (RAG) helpdesk assistant, an LLM/agentic web app for parsing
unstructured appliance data into cost estimates, and a GraphRAG system for natural-language querying of power grid data — all taken
from prototype to production, solo. Comfortable owning a system from algorithm research through IoT/data pipelines to deployment,
and working directly with product and operations teams to decide what’s worth automating.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Beginner

Language

English

Advanced

Work Experience

Principal Software Engineer at SP Group

November 1, 2020 - Present

Delivered SP Group’s first production generative AI application: a RAG-based help desk chatbot ingesting SP, NEA, and BCA Green Mark documentation from research to deployment. Built a GraphRAG system to enable natural-language querying of live power grid data. Shipped a web-based Home Appliance Energy Consumption Estimator where users upload unstructured appliance specs and an LLM/agent workflow parses them to produce electricity cost estimates. Sole backend creator of a power grid condition monitoring system integrating IoT sensors and ML pipelines with vendors and the Data Science team. Built an Indoor Environment Quality (IEQ) system end to end from algorithm research through IoT sensor integration and backend deployment. Accelerated development cycles using Claude Code and spec-driven development practices.

Senior Engineer at Cisco

May 1, 2019 - October 1, 2020

Led integration of Cisco AppDynamics with GCP-hosted microservices to enable application performance instrumentation across a distributed system. Delivered IoT edge security using the manufacturer Usage Description (MUD) specification and enabled COVID-19 contact tracing on ruggedized public-bus routers integrated with Singapore’s national Safe Entry system. Formulated a CI/CD framework (Jenkins) used across Go and Python prototyping projects at Cisco Singapore’s Innovation Centre.

Blockchain Research Developer at The Netherlands Organisation

October 1, 2017 - March 1, 2019

Built a permissioned Ethereum-Quorum blockchain test network for a feasibility study on inter-bank payments, contributing findings related to smart contract and key-management security vulnerabilities.

SOA Designer at Amdocs

November 1, 2015 - October 1, 2017

Designed and implemented APIs integrating CRM, Order Management, and Billing systems for telecom clients in regulated, multi-system environments with strict security and error-handling requirements. Defined API specifications spanning device management, fault management, and credit-check services.