Building the digital interface between code and hardware.
I am Mark Lester Cagay. A Cybersecurity Specialist, Full-Stack Developer & IoT Engineer focusing on secure systems, robust web applications, IT support, and IoT integration.
01. About Me
Mark Lester Cagay
Cybersecurity Specialist, Full-Stack Developer & IoT Engineer
Specializing in Secure Architecture & Embedded Systems
I am a BSIT graduate specializing in cybersecurity, secure systems architecture, and web systems integration. My work spans the entire stack, from implementing secure communication protocols in C++ for smart IoT sensors to protecting high-performance database gateways using PostgreSQL and building fortified full-stack applications.
I thrive on auditing systems for vulnerabilities, configuring robust firewall rules and encryption policies, writing secure and clean firmware, and optimizing relational databases with strict access control lists to ensure that digital infrastructures remain resilient against threats.
Graduated BSIT
Completed Bachelor of Science in Information Technology, specializing in full-stack architectures and systems integration.
02. Core Expertise
Disciplines I focus on to build secure, connected, and efficient digital infrastructures.
Web Development
Building fast, semantic, and modern responsive web systems using frameworks like Laravel, ASP.NET, and the MERN stack.
Arduino & IoT
Integrating physical hardware with the web, linking sensors, camera modules, and embedded chips to standard web servers.
Cybersecurity
Ensuring systems are protected from vulnerabilities through secure coding practices, access controls, and encryption.
IT Support
Maintaining database systems, resolving hardware failures, handling network administration, and configuring environments.
03. Tech Stack
Languages and frameworks I use to bring ideas to reality.
Languages & Core
HTML5 / CSS3
0%
JavaScript
0%
TypeScript
0%
C++
0%
PHP
0%
Python
0%
Frameworks & Databases
Laravel
0%
MERN Stack
0%
PostgreSQL
0%
ASP.NET MVC / C#
0%
Flutter
0%
Arduino & IoT (C++)
0%
04. Live IoT Telemetry Hub
Real-time simulation of sensor ingestion, capacity logs, and PostgreSQL DB gateway triggers.
05. Certifications
Professional credentials and security credentials in cybersecurity and network standards.
CS50's Introduction to Artificial Intelligence with Python
Explores the concepts and algorithms at the foundation of modern artificial intelligence, including search, machine learning, neural networks, and natural language processing in Python.
View CertificateEthical Hacker
Validates offensive security practices, threat profiling, network penetration testing, and vulnerability auditing inside network systems.
View CertificateDeveloping Secure Software (LFD121)
Covers secure software design, threat modeling, checking requirements, secure coding standards, and sanitizing input vectors.
View CertificateDevSecOps (LFS180)
Focuses on integrating automated security audits, container vulnerability scanning, SBOM tracking, and compliance baselines into pipelines.
View CertificateOWASP Top 10 Threats (SKF100)
Mitigating critical application security vulnerabilities including Injections, Authentication flaws, XSS vectors, and security misconfigurations.
View CertificateXSS Exploits & Defense (LFEL1010)
Advanced analysis of sanitizing input vectors, DOM context validation, and bypassing filter mechanisms to secure against Cross-Site Scripting.
View CertificateIntroduction to Zero Trust (LFS183)
Core principles of zero trust architecture, verifying identities explicitly, granting least privilege access, and assuming breach boundaries.
View CertificateOpenSSF Scorecard (LFEL1006)
Automated analysis of open-source repository security postures, checks for dependency updates, code reviews, and signed releases.
View CertificateSBOMs and Signatures (LFEL1007)
Tracking Software Bill of Materials (SBOMs), digital code signatures, container provenance verification, and supply chain integrity.
View CertificateSelf-Assessments (LFEL1005)
Frameworks for identifying open-source project security health, documentation standards, licensing, and vulnerability disclosure policies.
View CertificateSoftware Dev Managers (LFD125)
Establishing secure software developer processes, managing security-conscious engineering teams, and compliance baselines.
View CertificateEU Cyber Resilience Act (LFEL1001)
Covers regulatory criteria under the EU CRA, mandatory vulnerability disclosures, and supply chain security frameworks.
View CertificateOpenAPI Fundamentals (LFEL1011)
Covers API design principles, OpenAPI specifications, RESTful interfaces validation, and standardized schema modeling for modern web APIs.
View CertificateIntroduction to Linux (LFS101)
Focuses on working with the Linux CLI, bash shell scripting, system permissions administration, network configurations, and kernel filesystem models.
View CertificateIntroduction to WebAssembly (LFD133)
Compiling low-level languages (C/C++) into lightweight WASM bytecode, optimizing execution in browser sandboxes, and JavaScript interoperability APIs.
View CertificateIntroduction to Node.js (LFW111)
Developing server-side programs using Node.js modules, event-driven architecture, asynchronous patterns, file stream buffering, and HTTP request routing.
View CertificateSSL Certification
Securing channels with TLS negotiation protocols, asymmetric encryption keys exchange, CA configurations, and HSTS protocol enforcement.
CORS in Cisco
Detailed configuration of Cross-Origin Resource Sharing on Cisco network infrastructure interfaces and HTTP origin control headers.
06. Selected Projects
SEGREBIN: SmartBin Monitoring
An intelligent waste classification and telemetry system. Designed custom Arduino firmware in C++ to analyze sensor inputs, triggering real-time capacity logs sent directly to a centralized web application.
Visitors Management System
A secure visitor log and access control dashboard powered by a high-availability PostgreSQL backend. Designed to streamline check-ins, record encrypted logs in real-time, print passes, and perform audits.
CLSU Office Templates
A dedicated portal for managing, searching, and generating standardized office documents, letters, and dynamic templates to improve administrative workflows.
IoT Telemetry & Database Gateway
A high-throughput telemetry gateway integrating sensor nodes programmed in C++ and a time-series optimized PostgreSQL database. Features real-time data ingestion, live stream graphs, and custom warning triggers.
07. Say Hello
I'm currently looking for new opportunities as a full-stack developer or systems specialist. Whether you want to discuss a software project, IoT integration, or just say hi, my inbox is open!