Miftah Regyana

Backend Developer at PT. Eigen Tri Mathema

In this role, I worked on building and improving the REST APIs for a Mini-ERP system covering Inventory, Company, POS, and Discount modules. Most of my time went into making sure the data flow was clean and reliable, from designing the schema to ensuring the operations stayed ACID-compliant and responsive even when traffic spiked. I also spent a good amount of effort fixing performance issues on both the backend and frontend. After cleaning up a few heavy queries, restructuring some request flows, and adding the right caching layers, we were able to cut latency by around 40%, which made the whole system feel much smoother. Part of the job involved maintaining older sync apps that handled online/offline data. These had a lot of edge cases and used to fail quite often, so I added idempotency handling, better conflict resolution, and a more predictable retry mechanism. This reduced sync failures significantly and made the system way more stable for users in the field. To support future growth, I also started introducing microservice-friendly patterns like DDD and event sourcing. Not a full migration, but enough to set a clear direction for scaling the platform in the long run.

Software Engineer at Ajobthing Sdn Bhd

I led the end-to-end migration of several high-traffic queries from SQL to Elasticsearch. My work included designing the indices, analyzers, and field mappings, as well as building the ingestion and backfill jobs needed to populate the new clusters. Before switching traffic over, I added parity tests to compare SQL and ES outputs so we could validate correctness and avoid regressions. The migration significantly reduced the load on our primary database, offloading roughly 40–60% of read queries. With Elasticsearch handling the bulk of the read operations, most queries became sub-second, which improved the overall responsiveness users experienced in the product. On top of Elasticsearch, I built REST/JSON endpoints that supported facets, filters, and pagination. I also created clearer API contracts and examples, which made integrator onboarding faster and more predictable, around 30% quicker based on team estimates. To ensure reliability after migration, I implemented a sample-based validation flow that compared SQL and ES results side-by-side, with an acceptance threshold to flag anomalies. I also collaborated with the team on relevance tuning. This involved adjusting query DSL, boosts, and analyzers, as well as building the instrumentation needed to support evaluation and annotation workflows and ongoing data-quality checks.

Backend Engineer at Lifepack.id

During this period, I helped improve the overall code quality by introducing TypeScript and setting clearer refactoring standards across the team. Over time, this reduced a noticeable amount of runtime issues and made the services easier to maintain and extend. I worked on several microservices and designed them using Hexagonal Architecture, DDD, CQRS, and Event Sourcing principles. This structure helped us deploy updates faster, reduced coupling between components, and made it easier to build new features without breaking existing ones. I also handled multiple third-party and internal integrations, including Hospitality systems, WMS, and real-time delivery workflows. To keep these integrations stable, I implemented idempotent operations and auditable logging so we could track data flows clearly and avoid duplicated or inconsistent records. As the PIC for the WMS service, I coordinated fixes, handled on-call duties, and worked closely with ops to reduce incident volume and lower MTTR. This made the system more predictable and significantly improved the support load. To speed up development, I created reusable base modules and patterns that the team could plug into new services. This cut down feature development time and reduced repeated boilerplate across our codebase.

Back End Engineer at LifePack.id

Developed reusable backend and base modules and shared engineering patterns that shortened feature delivery time and improved team productivity across multiple services. Led and maintained critical third-party integrations across Hospitality, Warehouse Management, and real-time delivery systems. Acted as PIC for the Warehouse Management System module, coordinating issue resolution, production support, and cross-team fixes to keep business operations stable. Built backend and base modules and shared engineering patterns that shortened feature delivery time and improved team productivity across multiple services.

Back End Engineer at PT. Eigen Tri Mathema

Initiated migration from legacy JavaScript services to TypeScript and established refactoring standards, strengthening code quality, maintainability, and engineering consistency across the backend stack. Contributed to the adoption of scalable microservices architecture by building services with Hexagonal Architecture, DDD, CQRS, and event-driven patterns, enabling better modularity and long-term system scalability. Led and maintained critical third-party integrations across Hospitality, Warehouse Management, and real-time delivery systems, improving data consistency, traceability, and operational reliability. Developed reusable backend and base modules and shared engineering patterns that shortened feature delivery time and improved team productivity across multiple services.

Migrated to TypeScript, enhanced refactoring, and introduced modernized backend patterns to improve modularity and long-term scalability. Led the development of reusable backend and base modules and supported cross-service delivery across hospitality, warehouse management, and real-time delivery domains.

Leading backend development with Node.js, Express.js, and TypeScript, building RESTful microservices and scalable systems. Proficient in Java and PHP stacks, designing APIs and server-side components for high-availability services.

Backend Engineer at LifePack.id

Led and maintained critical third-party integrations across Hospitality, Warehouse Management, and real-time delivery systems; improved data consistency, traceability, and operational reliability. Served as the PIC for the Warehouse Management System module, coordinating issue resolution and production support. Developed reusable backend modules and shared patterns to shorten feature delivery time and boost team productivity.

Backend Engineer at Eigen Tri Mathema

Initiated migration from legacy JavaScript services to TypeScript; established refactoring standards to improve code quality, maintainability, and engineering consistency across the backend stack. Contributed to adopting scalable microservices architecture using hexagonal Architecture, DDD, CQRS, and event-driven patterns. Led and maintained critical third-party integrations across Hospitality, Warehouse Management, and real-time delivery systems; improved data consistency, traceability, and operational reliability.

Software Engineer at Job Thing Sdn Bhd

Led migration from legacy JavaScript services to TypeScript-based backend, establishing refactoring standards to improve code quality, maintainability, and consistency across the backend stack. Contributed to scalable microservices architecture by implementing Hexagonal Architecture, DDD, CQRS, and event-driven patterns to enable modularity and long-term system scalability. Drove architecture modernization initiatives and telemetry for observability. Built reusable backend modules and patterns to shorten feature delivery times and boost team productivity. Coordinated cross-team fixes and production support, acting as point of contact for Warehouse Management System module to maintain stable operations.

Backend Engineer at PT Eigen Tri Mathema

Initiated migration from legacy JavaScript services to TypeScript, established refactoring standards, improving code quality and maintainability across the backend stack. Contributed to scalable microservices architecture by building services with Hexagonal Architecture, DDD, CQRS, and event-driven patterns for modularity and long-term scalability. Led critical third-party integrations across Hospitality, Warehouse Management, and real-time delivery systems, improving data consistency, traceability, and reliability. Served as primary contact for Warehouse Management System module, coordinating issue resolution, production support, and cross-team fixes. Developed reusable backend and base modules and shared engineering patterns that shortened feature delivery times and boosted cross-team productivity.

Built backend services for ERP-related products and internal business applications; supported API development; improved performance; contributed to backend and frontend tooling to support evolving business requirements; designed and implemented REST/JSON APIs for ERP modules; migrated patterns and modernized architecture.