~/marc $ whoami

Marc Alain Bustamante

Senior Software Engineer · Backend & Full Stack

9+ years building reliable production systems across fintech, e-commerce and high-traffic chat infrastructure — mostly in Ruby on Rails and Node.js.

View CVEmail me

$ git log --author=marc

Experience

  1. Montani International Inc.

    Remote · valore.com

    Full-Stack Ruby on Rails Developer Jul 2023 – Oct 2026

    • Helped build and maintain Valore (valore.com), a multi-storefront, white-label e-commerce platform supporting an unlimited number of branded storefronts from a single shared codebase, cutting the time to launch a new storefront to days rather than weeks.
    • Worked as one of 3 engineers who built the platform from the ground up, taking it from concept to production and supporting live e-commerce operations for new and used books.
    • Led migration of the platform's payment gateway from a legacy third-party implementation to an internally integrated solution, improving maintainability and reducing production incidents.
    show more
    • Developed core customer-facing flows — customizable storefront pages, transactional email templates, sign-up, checkout, and order confirmation — directly improving conversion and reducing support tickets tied to a confusing legacy flow.
    • Applied TDD, CI/CD (GitHub Actions), and Git-based workflows throughout the development lifecycle to keep releases fast and reliable.
    • Used Claude and other AI-assisted development tools daily for coding, debugging, technical research, and documentation, measurably speeding up delivery.
    Ruby on RailsPostgreSQL

  2. PayMongo Philippines Inc.

    Remote · paymongo.com

    Senior Software Engineer (Interim Technical Lead) Jan 2023 – Jul 2023

    Software Engineer II Feb 2022 – Jan 2023

    • Acted as Interim Technical Lead, leading technical design and architecture decisions for Direct Online Banking (DOB) payment infrastructure supporting ~₱10 million in monthly payment volume.
    • Spearheaded the initial implementation of QR Ph payment processing, expanding the company's supported payment rails.
    • Built and maintained payment services processing online banking transactions through major Philippine banks, including BPI and UnionBank.
    show more

    Senior Software Engineer (Interim Technical Lead)

    • Partnered with engineers, product managers, and stakeholders to design and ship payment features from architecture through launch.
    • Ran code reviews and set testing standards that raised code quality and maintainability across the team.

    Software Engineer II

    • Developed and maintained Direct Online Banking (DOB) payment services powering transactions through Philippine banks.
    • Built integrations with BPI and UnionBank as part of the company's core online banking payment infrastructure.
    • Mentored junior software engineers on best practices, clean code, and rigorous code review standards.
    • Improved reliability of backend services supporting a high-volume, business-critical payment path.
    • Translated product requirements into technical implementations in close collaboration with cross-functional teams.
    Ruby on RailsReact.js

  3. Rakuten Travel Xchange

    Remote · solutions.travel.rakuten.com

    Full-Stack Node.js Developer Apr 2021 – Feb 2022

    • Developed and maintained backend services for a travel booking platform supporting property search and reservations in Japan, including accommodation bookings, experiences, and tours.
    • Reduced technical debt by raising test coverage from near-zero to 95% on every file touched during development, cutting regressions in a legacy codebase.
    • Enforced rigorous code review standards — going beyond rubber-stamping to actively raise coding standards across the team.
    show more
    • Partnered with project leads and stakeholders to plan and implement product enhancements.
    Node.js

  4. tawk.to

    Remote · tawk.to

    Back-end Node.js Developer May 2019 – Mar 2021

    • Helped build a Knowledgebase service and Contacts CRM from scratch as part of a small team with the CTO — both still active in production today, serving the #1 most-used live chat application in the world.
    • Worked on the team that designed and built an event-driven service on Apache Kafka, decoupling core workflows and enabling reliable communication between distributed services.
    • Helped build a real-time data pipeline combining MongoDB Change Streams with Kafka, streaming data changes to downstream services with minimal latency.
    show more
    • Maintained 100% test coverage across owned services, keeping regressions out of a platform relied on by millions of websites.
    • Implemented Elasticsearch-powered search and filtering, and contributed to architecture discussions within a 4–5 person engineering team.
    Node.jsApache KafkaMongoDBElasticsearch

  5. SplitDragon

    Remote

    Full-Stack Ruby on Rails Developer Dec 2018 – Jul 2019

    • Maintained and developed the company's online marketplace platform for sellers.
    • Led front-end development, building customer-facing landing pages that showcased products and services to drive sales.
    • Contributed to technical decisions and development planning for the platform.
    Ruby on Rails

  6. Akubo Software Philippines Inc.

    On-site

    Software Engineer Mar 2017 – May 2019

    • Built a payroll system implementing Philippine-specific payroll requirements, deductions, and employee benefits across three client companies with differing business rules.
    • Developed and maintained a Ruby on Rails HR management application for small and medium-sized businesses.
    • Took on technical leadership responsibilities, guiding decisions and development efforts for the team.
    show more
    • Partnered with clients and internal stakeholders on requirements analysis and development planning.
    Ruby on Rails

$ ls ~/projects

Selected work

RESIST storefront homepage with a full-width banner reading "Faster than my excuses"
[client]2026

RESIST — streetwear store with race-safe checkout

Online store and back office for a Bacolod streetwear brand, where two shoppers can never buy the last shirt and every sales channel draws from one stock count.

Next.jsTypeScriptPostgreSQLDrizzle ORMPayMongo
Valore homepage with a textbook search bar and links to rent, buy and sell textbooks
[team]2023–2026

Valore — white-label multi-storefront e-commerce platform

One codebase powering an unlimited number of branded bookstores — new storefronts launch in days, not weeks.

Ruby on RailsPostgreSQL
PayMongo payment methods section with cards for e-wallets, debit and credit cards, QR Ph, Direct Online Banking with BPI, UnionBank, BDO, Metrobank and Landbank, and Buy Now Pay Later
[team]2022–2023

Direct Online Banking & QR Ph payments

Payment infrastructure moving ~₱10M a month through major Philippine banks, plus the first QR Ph implementation.

Ruby on RailsReact.jsQR Ph
tawk.to Knowledge Base article editor with document settings for slug, status, visibility, category, language and author
[team]2019–2021

Knowledgebase & Contacts CRM, on a real-time event pipeline

Two products built from scratch and still in production for millions of websites, kept in sync by a Kafka and MongoDB Change Streams pipeline.

Node.jsMongoDBApache KafkaElasticsearch

$ cat skills.yml

Skills

languages_runtimes:
[Ruby, Node.js, JavaScript, PHP]
frameworks_libraries:
[Ruby on Rails, Vue.js, React.js, Next.js]
data_storage:
[PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch]
infrastructure_messaging:
[AWS, Google Cloud Services, Kafka]
devops_tooling:
[Git, GitHub Actions (CI/CD), Docker]
engineering_practices:
[RESTful API Design, Microservices Architecture, TDD/BDD, Performance Optimization, Code Reviews]
ai_assisted_development:
[Claude, Generative AI tooling]

$ ping marc

Contact

Open to senior backend and full-stack roles, remote. The fastest way to reach me is email.

mrcbstmnte@gmail.com