Jayssen Baybay Caras

Experience

Shipping, logistics, and financial platforms—microservices, integrations, and production operations.

1. Senior Software Engineer

   Luxclusif / Farfetch

   Remote · Contract · Shipping & logistics microservices

   • Core engineer for the Shipments service (single source of truth) used across invoices, returns, warehouse transfers (WHT), and purchase orders (POs).
   • Led AfterShip Tracking API migration (v2025-07): webhook schema changes, backward compatibility, and full integration test coverage.
   • Implemented and tested AfterShip webhooks, legacy shipment mapping, and background job orchestration.
   • Integrated and debugged EasyPost carrier flows (UPS, FedEx, DHL) for waybill and rate generation.
   • Designed event-driven shipment propagation with async contracts for analytics and downstream services.
   • Built Kafka and Azure Service Bus messaging pipelines for shipment status propagation.
   • Debugged production issues with Azure Application Insights end-to-end tracing.
   • Implemented RBAC and JWT authentication across services; contributed to returns, WHT, invoice tracking, and courier integrations.
2. Freelance — .NET, Java & Python

   Upwork

   Oct 2022 – Jan 2025 · Remote

   Led a distributed team of seven delivering fintech solutions for global clients, with on-time delivery and strong quality standards.

   .NET developer

   • REST and SOAP web services; API integration and modernization of legacy APIs.
   • Banking-style features: OAuth2/JWT auth, account management, fund transfers, loans and credit, fraud alerts, investments, admin dashboards.
   • HTML & CSS for responsive UI work where needed.

   Java developer — banking transaction management

   • Java Spring Boot microservices for transaction processing and fraud detection.
   • REST APIs integrating KYC and payment providers.
   • GitLab CI/CD, Docker, Kubernetes; Prometheus and Grafana for monitoring.
   • JIRA, Confluence; R&D for Japan train transport (ROD-WIFI); QA automation and manual testing.

   Python developer

   • Microfinance platform: Django Allauth, JWT, anomaly detection (Scikit-learn / TensorFlow), reporting, and account management.
3. Software Engineer

   Solution Exchange

   Makati, Philippines · Apr 2021 – Oct 2022

   Fintech focused on banking operations, efficiency, and customer experience.

   • Agile delivery for money transfer and remittance systems.
   • Modules integrating with AWS; B2B and B2C remittance flows.
   • Java and Wicket; NoSQL data handling.
4. Software engineer (outsourcing — Japan market)

   Tsukiden Global Solutions

   Ortigas, Philippines · Dec 2018 – Jan 2021

   • C, Java, SQL, Unix; jointing management system work.
   • Android & iOS R&D: facial and location recognition (including Swift).
5. Management Information Systems Specialist

   Telford Services

   Mar 2016 – Feb 2017

   • Systems for product documentation, environmental logging (temperature/RH), and order tracking.

Technologies

Backend, frontend, data, cloud, and how systems are built and run in production.