Marcus J. Delacroix

Profile

Full-stack software developer with 8 years building scalable web applications and distributed systems across fintech and SaaS verticals. Specializes in React, Node.js, and AWS-based architectures, with a track record of reducing API latency by 40% and shipping features that directly drove revenue growth. Holds AWS Solutions Architect Associate certification and contributes actively to open-source tooling.

Work Experience

Senior Software DeveloperMar 2021 - Present

Vantara Financial Technologies, Austin, TX

Architected a real-time transaction processing microservice in Node.js and Kafka that handled 12,000 events per second, cutting average processing latency from 320 ms to 190 ms.
Led a 4-engineer squad to rebuild the customer dashboard in React 18 and TypeScript, reducing page load time by 52% and increasing 30-day retention by 18%.
Introduced automated integration test coverage using Jest and Playwright, raising coverage from 34% to 89% and eliminating a class of regression bugs that had cost $140K in incident remediation annually.

Software DeveloperJun 2018 - Feb 2021

Orbitline SaaS, Denver, CO

Built a multi-tenant billing engine in Python and PostgreSQL that processed $4.2M in monthly recurring revenue with zero payment-processing outages across 18 months.
Optimized a legacy ETL pipeline by rewriting critical path logic in Go, reducing nightly batch runtime from 4.1 hours to 38 minutes and freeing capacity for 3 additional data sources.
Mentored 2 junior developers through code reviews and pair-programming sessions, both of whom were promoted to mid-level within 14 months.

Junior Software DeveloperAug 2016 - May 2018

Brightpath Digital Agency, Dallas, TX

Developed 11 client-facing web applications using React and Django, delivering all projects within scope and on schedule across a 22-month tenure.
Integrated third-party REST APIs including Stripe, Twilio, and Google Maps for a logistics client, reducing manual dispatch coordination by 30%.
Refactored a monolithic PHP codebase into modular service components, cutting average bug-fix turnaround from 6 days to 1.5 days.

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