Software engineer since 2008. Technical writer since 2011. Lead engineer from 2015–2025. Security researcher since 2024.
I write about software engineering, cloud infrastructure, application security, and real-world development practices.
Hi, I'm Hangga Aji Sayekti.
Software engineer since 2008, lead engineer from 2015 to 2025. I've helped teams build production systems, mentor developers, and drive engineering initiatives.
Since 2011, I've been writing practical programming tutorials. In 2023, my work appeared on Baeldung, CircleCI, Vultr, and DigitalOcean. Since 2024, I've also been active in penetration testing and secure coding training.
Today, I help developer-focused companies create technically accurate content that actually resonates with engineers.
Tutorials, security research, and engineering guides from 2023–2025
Step-by-step guide to controlling JVM bytecode versions in Kotlin projects, ensuring compatibility and leveraging newer runtime features.
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Hands-on tutorial for XSS detection using Dalfox on Kali Linux — installation, core commands, and automated scanning techniques.
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Integrating OWASP ZAP, REST-Assured, and other tools into CircleCI pipelines to catch vulnerabilities early without slowing development.
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Automating detection of vulnerable dependencies (Log4Shell, CVE-2017-5638) in CI/CD pipelines to prevent supply chain attacks.
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Complete guide to building efficient, coroutine-driven serverless APIs — from project setup to CRUD implementation and cloud deployment.
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How a casual recon session uncovered an IDOR vulnerability affecting 100k+ users on HackerRank — methodology, impact, and fixes.
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In this tutorial, we’ll specifically discuss several ways to exclude transitive dependencies in Gradle.
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Optimizing startup latency for Kotlin Ktor APIs on DigitalOcean App Platform — dependency trimming, engine switching, and runtime config.
Read article →I help developer-focused companies communicate complex technical topics with clarity, accuracy, and real-world engineering context.
Tutorials, engineering deep-dives, cloud infrastructure guides, DevOps content, architecture articles, and developer education resources.
Secure coding guides, vulnerability analysis, bug bounty write-ups, application security content, and security-focused technical education.
Technical editing, code validation, fact-checking, and content reviews to improve accuracy and developer trust.
17+ years of hands-on software engineering experience, from application development to system architecture and technical leadership.
Articles and tutorials built from practical experience, not rewritten documentation or generic AI-generated content.
Published on platforms including Baeldung, CircleCI, Vultr, and DigitalOcean, reaching developer audiences worldwide.
Active in penetration testing, bug hunting, and secure coding, bringing a security-first mindset to technical content.