Mark Lenin Viscaino
Mark Lenin Viscaino

Senior Software Engineer

Open to offers · Member since 15 Sep 2026
Location
Angeles City, Philippines
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Senior

About

Professional summary

I am a Senior Software Engineer with over eight years of experience building backend systems, cloud-native applications, microservices, event-driven platforms, and AI-powered workflow automation.
I specialize in Python, TypeScript, Node.js, FastAPI, Django, React, AWS, PostgreSQL, and REST API development. My work focuses on designing reliable, scalable services and production-grade integrations.
I have extensive experience creating asynchronous processing pipelines, serverless architectures, document-processing services, data transformation workflows, and integrations with external SaaS and marketing platforms.
I build AI-assisted systems that combine LLM APIs with deterministic business rules, validation layers, confidence checks, auditability, and human-in-the-loop review processes.
I am experienced in system design, API and data-model design, observability, automated testing, infrastructure as code, CI/CD, code reviews, technical documentation, and production troubleshooting.
I enjoy partnering with product, operations, and engineering stakeholders to turn complex business processes into maintainable software solutions. I am open to remote opportunities across US, EU, and APAC working hours.

Notice period: Immediately

Skills

38 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Senior Software Engineer Callback

I architect and develop Python and FastAPI backend services for an AI-native enterprise operations and workflow automation platform. I build reusable, auditable workflows that support request ingestion, classification, routing, extraction, reconciliation, validation, exception detection, escalation, and output generation.

I design asynchronous processing infrastructure, PostgreSQL data models, REST integrations, and React/TypeScript workflow interfaces. I also improve production reliability through CloudWatch monitoring, structured logging, operational metrics, testing standards, code reviews, technical documentation, refactoring, and mentoring.

Software Engineer Upstack Data

I built Node.js and TypeScript backend services for server-side ecommerce event collection, customer identity processing, conversion tracking, marketing attribution, and third-party data delivery. I developed webhook ingestion pipelines and integrations with Shopify, Meta Conversions API, Google Ads, and Klaviyo.

I designed event-driven microservices using AWS Lambda, API Gateway, SQS, SNS, and EventBridge, with resilient retry, idempotency, validation, normalization, and delivery-state mechanisms. I maintained PostgreSQL and DynamoDB models and contributed across testing, infrastructure as code, CI/CD, deployment, troubleshooting, and product improvements.

Software Engineer Accenture

I delivered enterprise application integration, API modernization, cloud data modernization, and workflow automation solutions. I developed Python backend services and REST APIs using Django and Django REST Framework, including business logic, validation, authentication, authorization, integrations, and reusable data-access components.

I built ingestion and transformation pipelines with Pandas, SQL, and PySpark, and supported AWS workloads using Lambda, API Gateway, S3, RDS, EC2, and CloudWatch. I improved delivery reliability with Docker, Jenkins CI/CD, Terraform, automated testing, logging, retry mechanisms, deployment support, and root-cause troubleshooting.

Software Developer Orange & Bronze Software Labs

I developed enterprise web applications, workflow systems, and fintech-oriented software using React, JavaScript, Redux, TypeScript, HTML, CSS, and Sass. I created reusable frontend components for forms, dashboards, data tables, search, workflow screens, validation, loading states, and error handling.

I expanded into full-stack development by building Node.js and Express services, TypeScript modules, REST endpoints, and PostgreSQL queries. I improved application quality through Jest testing, Git-based reviews, npm and Webpack workflows, Jenkins continuous integration, Docker environments, refactoring, and Agile collaboration.

Education

Learning history

De La Salle University

Bachelor of Science, Computer Science

Bachelor of Science in Computer Science.

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