Allan S.

About Me

Senior Backend Engineer with strong experience architecting and scaling high-availability microservices, event-driven systems, and distributed backend platforms across healthcare, finance, and Al-driven environments. Skilled in building resilient APIs and backend services using Node.js, Ruby on Rails, and Python, supported by PostgreSQL, Redis, and cloud-native architectures deployed on Kubernetes. Brings hands-on expertise integrating LLM-powered automation, Al-driven workflows, and RAG pipelines using Python, LangChain, LlamaIndex, vector databases, and modern model-evaluation tooling. Proven success delivering secure, HIPAA-aligned backend capabilities for virtual healthcare, video consultations, and real-time communication, while improving system throughput, latency, observability, and release reliability. Strong foundation in CI/CD, automated testing, and scalable distributed systems- consistently driving higher performance, reduced incidents, and intelligent automation across platforms.

Frontend

Work history

Denologix
Denologix
Software Engineer
2023 - 2023
Remote
  • - Delivered advanced automation by integrating Al-driven workflows, LLM-powered services, and intelligent developer tooling.

  • - Designed and deployed enterprise-grade RAG pipelines, including vector indexing, semantic search, and context-aware retrieval layers. - Built multimodal Al agents, model evaluation frameworks, and predictive optimization components leveraging PyTorch and transformer-based architectures.

  • - Implemented Qualtrics XM platform for scalable customer and user feedback collection, integrating surveys into web applications via APIs and event-based triggers. - Designed backend workflows to capture, process, and persist survey responses, enabling real-time analytics and experience tracking. - Connected Qualtrics data with internal systems (APIs, data pipelines) to support advanced reporting, sentiment analysis, and product decision-making. - Improved user experience insights by embedding contextual surveys and automating feedback loops across distributed services.

PythonLangChain LlamaIndex OpenAI APIs KubernetesFAISS Weaviate PytorchQualtrics Qualtrics API Integration
Curve Health
Full Stack Developer
2020 - 2023 (3 years)
Remote
  • Built and scaled full-stack services for a virtual healthcare and teleconsultation platform.

  • Developed secure features for video visits, real-time chat, and care-team collaboration.

  • Delivered performant web and mobile interfaces and enhanced real-time collaboration and system reliability.

FIXER Inc
Full Stack Developer
2015 - 2020 (5 years)
Remote
  • Led the development of microservices for a banking platform, improving system reliability and performance across core financial workflows.

  • Delivered high-quality front-end features and built and optimized backend services.

  • Improved event-driven reliability and streamlined deployments, enabling faster, more reliable CI/CD pipelines.

Education

Education
Bachelor's degree
The University of Hong Kong
2012 - 2015 (3 years)