TMSVR - Dev Blog

TMSVR - Dev Blog

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Latest — 22 Jun 2026

Fintech Toolbox: A Free Browser-Based utilitiy for Engineers in finance

A free, browser-based toolbox for fintech engineers and payment ops teams - parse NACHA ACH and ISO 20022 files, validate in real time, anonymize sensitive data, and track Fed cutoff windows. No install, no login.

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Spring @Transactional Deep Dive: Proxies, Propagation, and the Traps That Still Catch Senior Engineers

How Spring @Transactional actually works under the hood — proxies, thread-locals, propagation mechanics, rollback rules, and the silent failures that trip up experienced engineers.

Scaling an LSM-Tree: Thread-Safety and the Art of Non-Blocking

Moving from a single-threaded datastore to a high-throughput, concurrent LSM-tree isn't just about adding locks—it's about protecting invariants. Learn how to implement non-blocking reads and memtable rotation to build a database that is both thread-safe and fast.

Why Your @Retryable Fails with @Transactional in Spring (and How to Fix It)

Learn why Spring's @Retryable can silently fail with @Transactional due to AOP advice ordering — plus two production-ready fixes

Java File writing I/O performance

Boost Java file writing performance by choosing the right I/O method. Learn how BufferedWriter, FileChannel, and RandomAccessFile impact speed, durability, and efficiency—plus how I achieved a 4x faster commit-log write in my LSM tree database. 🚀

Building a Database III - Bloom filters and performance

Learn how to integrate Bloom filters into a Log-Structured Merge Tree (LSM) datastore for faster data lookups and improved performance. This article covers the implementation process, performance testing, and key insights from optimizing the filter in a real-world use case.

Practical use of generics in Java

Dive into the world of Java generics as we transform a simple key-value store to support any data type! This post breaks down the process of refactoring code for flexibility, covering the hurdles I faced along the way. Perfect for developers wanting to level up their designs with generics! 💡

Building a database II - B-Trees

Explore how B-Trees work, their role in database indexing, and how they compare to LSM trees. This post covers insertion, search, and deletion with a hands-on implementation, highlighting key challenges like restructuring. A great starting point for developers diving into B-Trees! 🚀

Open sourcing AtlasNinja

Discover AtlasNinja: an open-source interactive map for exploring global data, now available on GitHub.

Building a Database I - Log-Structured Merge Trees

Here is how a log-structured merge tree works and why it is an advantageous database engine with code examples.