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Sajith Herath

Sajith Herath
Lead Software Engineer

8+ years of experience building scalable backend systems, LLM-powered microservices, and robust data pipelines. Specialist in Python, AWS, and modern Data Engineering architectures.

Python
Bash
SQL
FastAPI
Pandas
Celery
Pytorch
Tensorflow
Agno
LangGraph
PostgreSQL
MongoDB
Redis
AWS
Docker
Kubernetes
Apache Airflow
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Professional Portrait

Professional Journey

My evolution through the tech industry.

Experience

Senior Tech Lead

Apr 2026 - Present
EY GDS
  • check_circleAssigned to implement the backend APIs for a centralized Demand Tracking tool, enabling automated tracking of internal job openings to reduce manual staffing overhead across departments.

Lead Software Engineer

Apr 2024 — Jan 2026
PrimeSens LLC
  • check_circleDesigned system architecture and led the team to build LLM-powered microservices for a CRM platform, featuring intelligent lead scoring and an agentic AI chatbot.
  • check_circleDeveloped an analyzer for rent roll and T12 statements utilizing LLMs, automatically extracting tabular data from diverse PDF and spreadsheet formats.

Senior Software Engineer

Aug 2021 — Apr 2024
PrimeSens LLC
  • check_circleReduced AWS server costs by 89% by designing a GPU-accelerated video transcoding solution and real-time closed captioning engine.
  • check_circleDeveloped multivariate time series forecasting models for geo-specific mortgage rates, delivering actionable insights.
  • check_circleEngineered a recommendation system using Collaborative Filtering and a CNN facial classifier for AR try-on experiences.
  • check_circleDesigned and deployed scalable microservices for a unified social media management platform via Kubernetes.
  • check_circleDeveloped high-throughput post schedulers processing complex media files and optimized data analysis across 50+ metrics.

Software Engineer

Oct 2020 — Aug 2021
Self Employed
  • check_circleBuilt and scaled automated ETL pipelines using Apache Airflow for SEC Form 4 data, processing 5 million historical records.
  • check_circleDeveloped and maintained web scrapers for over 8,000 companies, enriching Form 4 datasets.
  • check_circleDesigned and implemented REST APIs (FastAPI) and microservices, including real-time video streaming solutions using AWS Chime, FFmpeg, and WebRTC.

Software Engineer

Jul 2019 — Sept 2020
Arimac Lanka (pvt) Limited
  • check_circleEngineered multi-platform integrations for a social listening tool, expanding data extraction across various channels.
  • check_circleIntegrated SERP analysis to enhance a social listening tool, enabling extraction of web search data.

Software Engineer Intern

Jul 2017 — Jul 2018
Fortunaglobal (pvt) Limited
  • check_circleDeveloped fintech chatbots using fuzzy logic and sequence ML models for online banking functionalities.
  • check_circleBuilt a dashboard visualizing chatbot interactions and managed secure on-premise deployment.

Featured Projects

Some of my recent technical work.

Projects

Insights Terminal

code

Built and scaled automated ETL pipelines using Apache Airflow for SEC Form 4 data, processing 5 million historical records and over 3,000 daily filings to power robust insider trading analytics.

FastAPIApache AirflowPostgreSQL

Stock Price API

code

This Python based REST API provides efficient access to real-time and historical stock market data. Developed using FastAPI, it streamlines financial data retrieval, offering endpoints for current prices and historical trends. Designed for high performance and easy integration, it serves as a robust backend solution for financial dashboards and analysis tools.

PythonFastAPIAsync

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Ready to build something extraordinary?

Currently available for senior engineering roles or high-impact consulting projects.

mailsajithdherath@gmail.com