Looking for a job

Mark Lenin Viscaino

@markleninviscaino

Message

I build reliable cloud-native backend systems, event-driven platforms, and AI workflow automation.

Philippines

Message

What I'm looking for

I'm looking for remote software engineering work where I can build reliable backend, cloud-native, event-driven, and AI-assisted automation systems for meaningful business workflows.

At Callback, I build Python/FastAPI services that turn complex enterprise procedures into reusable, auditable AI-assisted workflows. I design document-processing, structured extraction, validation, human-review, and asynchronous job-processing systems backed by PostgreSQL, React, and AWS.

Previously, I built server-side ecommerce tracking and identity platforms at Upstack Data and enterprise modernization solutions at Accenture. Across 8+ years, I've delivered APIs, microservices, data pipelines, cloud workloads, and production automation using Python, TypeScript, Node.js, AWS, PostgreSQL, and React.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Callback

Dec 2024 - Present (1 year 9 months)

Architect and develop Python/FastAPI backend services for AI-assisted enterprise operations, building multi-stage workflow pipelines and document-processing services. Integrate LLM APIs with deterministic business rules and design asynchronous job-processing infrastructure.

Software Engineer

Upstack Data

Jan 2023 - Nov 2024 (1 year 10 months)

Built Node.js and TypeScript backend services for server-side ecommerce event collection, customer identity processing, and marketing data delivery. Developed event-driven microservices using AWS Lambda, API Gateway, SQS, SNS, and EventBridge.

TypeScript NodeJS AWS Lambda API Gateway Amazon SQS SNS EventBridge PostgreSQL DynamoDB Shopify API Meta API Google Ads APIs Klaviyo APIs SQL Cloudwatch CI CD Infrastructure as Code Testing Automation

Software Engineer

Accenture

Jan 2020 - Dec 2022 (2 years 11 months)

Delivered software across enterprise application and API modernization and cloud-based data and workflow automation. Developed Python backend services and REST APIs using Django and Django REST Framework, and built data pipelines with Pandas, SQL, and PySpark.

Python Django Django REST Framework PostgreSQL Oracle Pandas PySpark AWS Lambda API Gateway EC2 S3 RDS Cloudwatch Docker Terraform Jenkins React JavaScript SQL Unit Testing Integration Testing CI CD Agile Scrum

Software Developer

Orange & Bronze Software Labs

Oct 2017 - Dec 2019 (2 years 2 months)

Developed enterprise web applications and workflow systems using React, JavaScript, and Redux, and expanded into full-stack development with Node.js/Express.js and PostgreSQL. Improved application quality through testing, code review, and CI/CD.