Ricardo – Node.js, Java, Python

Backend development to handle money transfers between wallets so that users can split their home bills in an easy, automated way.

• Engineered and deployed the backend infrastructure for a multi-wallet financial platform, supporting wallet creation, transfers, and balance reconciliation with high consistency;
• Designed and implemented secure, role-based RESTful APIs, ensuring proper access control and data protection for all user operations;
• Integrated seamlessly with external financial partner APIs for real-time money transfers, transaction tracking, and reconciliation logic;
• Created and optimized the relational database schema for the entire application using industry best practices in normalization, indexing, and referential integrity;
• Conducted comprehensive end-to-end testing, including unit, integration, and regression testing to ensure application reliability and stability;
• Collaborated with product and frontend teams to align backend delivery with business requirements and frontend expectations.

The company specializes in digital roadside and mobility assistance services, leveraging location-based services, real-time data, artificial intelligence, and machine-to-machine communication to provide on-demand assistance for services such as towing, jump starts, tire changes, fuel delivery, and lockouts

• Architected and maintained Java 17 and Spring Boot microservices for high-availability roadside assistance features, including dispatch coordination, partner integration, and service tracking;
• Developed scalable APIs and asynchronous workflows using Spring WebFlux, Reactor, and gRPC, ensuring millisecond-level latency for mobile and partner applications;
• Implemented robust OAuth2 and JWT-based authentication flows using Spring Security, enabling multi-role access control (client, partner, platform admin);
• Optimized real-time geolocation and ETA calculations through custom integrations with Kafka, Redis, and Elasticsearch, improving incident response times by 20%;
• Worked closely with platform engineers and product managers to deliver SLA-compliant solutions with 99.99% uptime, leveraging AWS (EC2, RDS, SQS, Lambda, S3) and GitHub Actions for CI/CD;
• Led performance profiling and debugging of Netty-based transport layers, resolving memory leaks and thread starvation issues affecting high-throughput dispatch pipelines;
• Participated in technical design sessions, sprint ceremonies, and incident postmortems, driving continuous improvements across system reliability and fault tolerance.

A web application for parking lot management. It handles hourly rates, vehicle types, available parking spots, parking operators, and a handful of useful reports.

• Spearheaded the end-to-end development of a cloud-native POS system for parking lot operations, ensuring high availability, fast response times, and seamless hardware integration;
• Designed and implemented a feature-rich management dashboard, enabling real-time monitoring, user access control, and reporting capabilities for operational teams;
• Architected and built scalable backend services supporting both the POS and dashboard using modern design patterns, RESTful APIs, and secure data handling practices;
• Recruited, led, and mentored a small cross-functional engineering team to deliver a custom discount engine, aligning product roadmap execution with business objectives;
• Acted as technical co-founder and CTO, defining the technology vision, selecting the project’s core tech stack, and ensuring long-term maintainability and scalability;
• Collaborated directly with stakeholders and end users to conduct requirements analysis, prioritize features, and transform business challenges into usable, user-friendly software products;
• Oversaw deployment pipelines, code quality standards, and development best practices across the team to ensure delivery excellence and technical consistency.

A conversational commerce platform that helps businesses engage with customers through messaging apps like WhatsApp, Facebook Messenger, and others

• Engineered scalable, event-driven backend services using Node.js and TypeScript, powering high-volume conversational flows for enterprise clients across Latin America and Asia;
• Designed and deployed serverless functions on AWS Lambda and Google Cloud Functions, supporting dynamic chatbot responses, intent routing, and third-party service integrations;
• Developed reusable libraries and low-code tooling to streamline chatbot creation, reducing time-to-market for custom bots by 70% across the product team;
• Maintained complex messaging pipelines with MySQL and Redis, enabling stateful conversations and fallback mechanisms across millions of active users;
• Built modular middleware layers for integrating AI-powered NLP engines (Dialogflow, Rasa) and orchestrated conversational logic based on customer behavior and CRM events;
• Led backend efforts in cross-functional squads delivering end-to-end features, including payments, product discovery, and transactional messaging inside apps like WhatsApp Business;
• Implemented internal dashboards and APIs for managing campaign workflows, user segmentation, message templates, and metrics, ensuring compliance with Meta platform constraints.

A leading global digital payments platform that enables individuals and businesses to make and receive payments online securely.

• Maintained and modernized complex, high-volume Java 7/8 monoliths used for international remittances, bill payments, and mobile airtime recharges, ensuring uninterrupted service across 37 countries outputting a load of 6 million transactions per day.• Troubleshooting and resolving deeply embedded legacy bugs and concurrency issues, contributing to critical uptime improvements for transaction flows and FX rate sync services;
• Refactored legacy codebases with emphasis on SOLID principles, test coverage, and modularization, enabling safer deployments and regression control;
• Developed backend APIs and transaction workflows in Java and Spring, enabling real-time money transfer integrations with telecoms and financial institutions;
• Collaborated with global teams to standardize compliance logic for KYC/AML screening within payments workflows, improving fraud prevention and audit readiness;
• Designed and deployed new Node.js microservices in the later stages of the project to support global remittance requests and asynchronous customer notifications via email and SMS;
• Participated in production incident resolution (L3 support), system upgrades, and technical documentation of legacy flows, gaining deep domain knowledge in digital payments and transaction reliability.