Open to opportunities

Gian Tobias

@giantobias

Message

I build scalable backend infrastructure, APIs, and cloud platforms for high-volume systems.

Philippines

Message

What I'm looking for

I'm looking to build scalable backend, infrastructure, and cloud systems where I can reduce operational complexity and deliver reliable platforms at meaningful scale.

At Growsari, I build and support infrastructure, IAM, and store-network systems serving 100,000+ stores. I own a backend-agnostic promotions layer processing 150,000 transactions per week and co-own services authenticating around 2,000 internal users.

I've also led backend delivery for Ulap's multi-cloud management system across AWS, GCP, Azure, and IBM, and built research data platforms and HPC tooling at DOST-ASTI. I enjoy designing distributed systems, cloud infrastructure, and APIs that reduce operational complexity.

Experience

Work history, roles, and key accomplishments

Current

Back-end Developer

Current

Growsari Inc.

Jul 2021 - Present (5 years 1 month)

Shipped and supported the agent/caller growth platform, cutting handoff between employees and back office by automating workflows in-app. Transitioned to core infrastructure and store network team, co-owning IAM and KYC services and building a backend-agnostic coupon layer processing 150,000 promo transactions weekly.

NodeJS Python Flask DynamoDB MySQL AWS Lambda API Gateway EC2 RDS Cloudwatch OpenSearch Gitlab Claude Code

Full Stack Engineer | Team lead

Umpisa Inc.

Sep 2020 - Jun 2021 (9 months)

Led a team of 2 engineers as primary backend developer on Ulap, coordinating with US-based counterparts to ship an automated, agnostic cloud management system. Architected and deployed the system across GCP, AWS, Azure, and IBM to reduce deployment time and complexity.

Flask fastAPI React PostgreSQL AWS GCP GKE EC2 CloudFormation Kubernetes Docker Gitlab

Backend Developer

Umpisa Inc.

May 2020 - Sep 2020 (4 months)

Built and shipped REST APIs across 2 projects.

Flask NodeJS PostgreSQL MongoDB AWS GCP Docker Gitlab

Science Research Specialist 2

Department of Science and Technology - Advanced Science and

Aug 2019 - Sep 2020 (1 year 1 month)

Became the primary client-facing engineer for research-grade dataset owners, presenting and onboarding them onto the Data Catalog. Designed and implemented a JupyterHub-based interface for the institute's HPC cluster, and built an open-source React tool to reduce job-submission errors.

MongoDB ExpressJS Angular NodeJS JupyterHub React HPC Gitlab

Web Developer, part-time

University of the Philippines - Diliman - Training Center fo

Aug 2019 - Nov 2019 (3 months)

Contracted to debug and refactor 3 milestone-based functions for PhilLidar, integrating with the Geonode/Geoserver geospatial stack; delivered all 3 milestones on schedule.

Django Geonode Geoserver

Science Research Specialist 1

Department of Science and Technology - Advanced Science and

Dec 2017 - Aug 2019 (1 year 8 months)

Extended a static Angular site into a full-stack web application with a Node/Express/MongoDB backend and OpenStack integration, supporting 50+ users and 3+ datasets.