Founded on Engineering Rigor & Trust
Bringing real-world enterprise banking discipline to software systems where security, compliance, and zero downtime are essential.
Yahya Ceylani
Founder & Senior Software Architect
ITU Computer Engineering (2018)
With over 8 years of specialized backend engineering experience across leading financial institutions, I have designed and delivered mission-critical systems in core banking, treasury operations, instant payments (FAST/EFT), open banking (PSD2), and national fraud prevention (BKM SIPER).
Additionally, I have designed and deployed GPU-accelerated predictive machine learning architectures, achieving approximately 50x performance improvements over standard CPU execution for financial demand forecasting.
"In Finance, Success is Built on Reliability and Clean Architecture."
YHY Software was established to provide resilient, long-lasting software engineering for modern financial operations. Our purpose is to ensure that whether you are an established banking institution or an agile FinTech disruptor, your teams can rely on a solid, thoroughly tested, and regulatory-compliant architectural spine.
Test-Driven Development (TDD), clean design patterns, and rigorous continuous code audits.
Architectures conforming strictly to Central Bank, BKM, and European PSD2 directives.
Decoupled Kafka and RabbitMQ pipelines preventing contention during high-volume spikes.
Demonstrable 50x inference speedup for credit forecasting, liquidity analysis, and financial planning.
Foundational Tenets
Engineering Rigor & Strict Testing
In financial systems, every millisecond and every transaction matter. We embed Test-Driven Development (TDD) and 90%+ code coverage as non-negotiable fundamentals.
Compliance & Security by Design
Architectures fully aligned with regulatory frameworks (BRSA, Central Bank, PSD2), protected by mutual TLS (mTLS), tokenization, and comprehensive audit logs.
Decoupled Distributed Scalability
Microservices designed to handle unpredictable transaction surges without downtime, driven by Apache Kafka, RabbitMQ, and Kubernetes.
Value-Driven Applied AI
Treating AI not as hype, but as a practical business advantage: 50x accelerated GPU forecasting for cash flow, credit demand, and dynamic invoice discounting.
Experience & Career Milestones
Istanbul Technical University (ITU)
B.Sc. in Computer Engineering
Strong academic grounding in algorithms, data structures, distributed systems, and core software engineering principles.
Enterprise Platforms & Treasury Foundations
Enuygun.com & Fibabanka
Engineered Symfony-based member platforms and Kondor Treasury Management System (TMS) integrations, gaining hands-on financial domain expertise.
Greenfield Treasury & Derivatives Platform
TKYB (Development & Investment Bank of Turkey)
Architected and built a ground-up microservices treasury platform managing Spot, Swap, Forward, and Repo derivative products.
Technical Leadership & GPU-Accelerated AI
İş Factoring (Delivery Team Lead)
Led a 4-engineer team developing Supply Chain Finance platforms; trained and productionized deep learning models running 50x faster on GPU clusters compared to CPU.
Open Banking (PSD2) & Event-Driven Architecture
Akbank (Senior Software Developer)
Delivered BKM-compliant payment consent, recurring payment engines, and high-volume Kafka/IBM MQ workflows under strict regulatory constraints.
Core Banking & FinTech Architecture Consulting
ColendiBank & YHY Yazılım
Delivered SWIFT (MT103/MT202), FAST, EFT, and BKM SIPER Fraud integrations; providing enterprise engineering and architecture advisory through YHY Yazılım.