Timothius Tirtawan

Senior IT Specialist · Surabaya, Indonesia

87.5%annual maintenance cost cut

6+years in banking software

~30%man-days saved via vendor negotiation

IEEEpublished author, deep learning

Summary

Team lead of the Online Loan Origination application (Core Loan Application) at PT Bank Central Asia Tbk (BCA). Full-stack developer in Java, Spring Boot, Angular, Python and PostgreSQL, delivering microservices on Red Hat OpenShift. Strong in re-architecture, vendor negotiation, capacity planning and mentoring.

Experience

Senior Information Technology Specialist, Core Loan Application

PT Bank Central Asia Tbk (BCA) · Oct 2023 - Present

Lead the Online Loan Origination team: customer-facing digital loan apps on Angular and Spring Boot microservices, Red Hat OpenShift.
Cut annual maintenance cost 87.5% (IDR 2 billion to IDR 250 million) by re-architecting fragmented microservices and micro frontends into domain services: transaction, workflow, session, master data, API gateway.
Negotiated with IT vendors: better SLAs and about 30% fewer project man-days.
Translate business requirements into functional specs; plan manpower and capacity across internal and vendor developers.
Onboard and mentor new engineers on codebase, banking domain and practices.

Information Technology Specialist

PT Bank Central Asia Tbk (BCA) · Nov 2019 - Sep 2023

Built and maintained full-stack loan origination apps: Java, Spring Boot, Angular, PostgreSQL.
Containerized and deployed microservices on Red Hat OpenShift.
Designed relational schemas and optimized SQL for loan processing.
Worked with business, testers and operations across the full SDLC.

Skills

Languages: JavaPythonTypeScriptSQL
Frameworks: Spring BootAngular
Data: PostgreSQLRDBMS
Platform & DevOps: Red Hat OpenShiftDockerMicroservicesMicro FrontendsAPI GatewaySoftware Architecture
Machine Learning: Deep LearningGANU-NetImage SegmentationTexture Synthesis
Professional: Team LeadershipRequirements AnalysisVendor NegotiationCost ReductionManpower PlanningMentoringAgile

Publication

T. Tirtawan, E. K. Susanto, P. C. S. W. Lukman Zaman, Y. Kristian, "Batik Clothes Auto-Fashion using Conditional Generative Adversarial Network and U-Net," 2021 3rd EIConCIT, pp. 145-150, IEEE. DOI 10.1109/EIConCIT50028.2021.9431867

CGAN with U-Net segmentation: 80.20% F1, 70.32% Jaccard Index; texture synthesis: 99.992% cosine similarity.