Open to opportunities

Johnson Go

@johnsongo

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Full-Stack engineer with 10+ years building scalable SaaS, AI apps, and high-traffic platforms.

Philippines

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What I'm looking for

I’m looking to build scalable, cloud-native products where I can ship AI and full-stack features, optimize latency and reliability, and collaborate across frontend and backend teams to deliver measurable user and business outcomes.

I’m a Full-Stack Engineer with 10+ years of experience building scalable SaaS platforms, AI-driven applications, and high-traffic web systems. I’ve delivered modern web experiences using Python and JavaScript ecosystems, REST API development, and responsive frontend frameworks—while staying relentless about performance optimization, distributed systems, and cloud-native reliability.

Most recently at Sperse, I designed Python (FastAPI) backend microservices and implemented AI-driven customer insight features, including retrieval of engagement signals into sales recommendations and segmentation. I also diagnosed and fixed CRM performance bottlenecks, cutting lead search query latency from 2.8 seconds to under 400ms, and improved responsiveness by adding Redis caching that reduced database load by ~40%; I further stabilized peak usage by migrating heavy workloads to asynchronous background workers. Earlier, at CrafterCrew and Sho.ai, I built retrieval-augmented generation (RAG) knowledge systems, conversational interfaces, and scalable AI inference services, as well as ML pipelines that process millions of events daily and power predictive analytics dashboards.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Engineer

Sperse

Mar 2024 - Feb 2026 (1 year 11 months)

Designed Python (FastAPI) backend microservices for CRM workflows and built AI-driven customer insight features for automated sales recommendations and segmentation. Reduced CRM lead search query latency from 2.8s to under 400ms and implemented Redis caching to cut database load by ~40%.

Python fastAPI Microservices REST APIs React Next.js PostgreSQL Redis Performance Optimization

Full-Stack AI Engineer

CrafterCrew

Mar 2021 - Feb 2024 (2 years 11 months)

Built AI-powered knowledge systems with natural-language querying over internal documentation. Implemented RAG pipelines (indexing, embeddings, vector search), developed FastAPI inference services, and created React/Next.js chat interfaces for knowledge assistants.

Retrieval Augmented Generation (RAG)Python fastAPI Vector Search Embeddings React Next.js Monitoring

Full-Stack Engineer

Sho.ai

May 2019 - Feb 2021 (1 year 9 months)

Developed backend services for an AI-driven SaaS platform delivering predictive analytics via REST APIs. Built scalable data ingestion and ML pipelines to process millions of user events daily, and implemented recommendation systems to personalize dashboards and application features.

Python REST APIs Machine Learning Pipelines Recommendations Message Queues Dashboards Data Ingestion

Full-Stack Developer

Wutzu

Jul 2016 - Apr 2019 (2 years 9 months)

Delivered full-stack features for a high-traffic e-commerce platform supporting product catalogs, customer accounts, and online payments. Optimized checkout performance to reduce cart abandonment, built advanced product search and filtering, and improved page load performance using caching and optimized API request handling.

React Vue.Js Angular Express API Design PostgreSQL Performance Optimization Caching Strategies