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
Software Engineer
2023 - 2025 (2 years)
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.

PythonLangChain LlamaIndex OpenAI APIs KubernetesFAISS Weaviate Pytorch
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)