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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Igor Kopestenski — Backend-Leaning Java Full-Stack Engineer | Distributed Systems, Security & Resilience</title>
<!-- SEO / Recruiter keyword indexing -->
<meta name="description" content="Igor Kopestenski — Backend-leaning Java full-stack engineer with 5+ years of carrier-grade distributed-systems experience. Java 25, Spring Boot 4, Spring Security, Angular, PostgreSQL, Docker, Kubernetes, secure coding, JWT, RBAC, observability, resilience." />
<meta name="keywords" content="Java, Java 25, Spring Boot, Spring Boot 4, Spring Security, Spring Security 7, Spring Data, JPA, Hibernate, Maven, REST API, Angular, TypeScript, HTML, CSS, PostgreSQL, SQL, Liquibase, Docker, Docker Compose, Kubernetes, K8s, GitLab CI/CD, Linux, Unix, JWT, RBAC, role-based access control, secure coding, vulnerability analysis, distributed systems, carrier-grade NAT, telemetry, DPI, Erlang, OTP, RTEMS, C, C++, Python, Bash, Tcl, full-stack engineer, backend engineer, software engineer, Belgium, Brussels, Antwerp, remote, Nokia, UCLouvain, edge computing, IoT, microservices, observability, high availability, real-time platforms, fintech, betting, gaming" />
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<meta name="twitter:description" content="Carrier-grade distributed systems. Java 25, Spring Boot 4, Security, Resilience." />
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<body>
<!-- Animated gradient background -->
<div class="bg-gradient" aria-hidden="true">
<div class="orb orb-1"></div>
<div class="orb orb-2"></div>
<div class="orb orb-3"></div>
</div>
<!-- Top navigation -->
<header class="nav" id="nav">
<div class="container nav-inner">
<a href="#top" class="logo">
<span class="logo-mark">IK</span>
<span class="logo-text">Igor Kopestenski</span>
</a>
<nav class="nav-links" aria-label="Primary">
<a href="#about">About</a>
<a href="#skills">Skills</a>
<a href="#experience">Experience</a>
<a href="#publications">Publications</a>
<a href="#contact">Contact</a>
</nav>
<div class="nav-actions">
<button id="theme-toggle" class="theme-toggle" aria-label="Toggle color theme" title="Toggle theme">
<svg class="icon-sun" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41M2 12h2M20 12h2M4.93 19.07l1.41-1.41M17.66 6.34l1.41-1.41"/></svg>
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</header>
<main id="top">
<!-- HERO -->
<section class="hero">
<div class="container hero-inner">
<div class="hero-text">
<div class="hero-tag">
<span class="dot"></span> Available for high-stakes engineering roles
</div>
<h1 class="hero-title">
<span class="line">Igor</span>
<span class="line gradient-text">Kopestenski</span>
</h1>
<p class="hero-subtitle">
Backend-Leaning Java Full-Stack Engineer<br />
<span class="muted">Security · Performance · Resilience · Distributed Systems</span>
</p>
<p class="hero-blurb">
5+ years of carrier-grade distributed-systems experience delivering true end-to-end features —
from <strong>Angular UI</strong> and <strong>REST APIs</strong> through <strong>security</strong>,
<strong>persistence</strong>, <strong>deployment</strong>, and <strong>operational resilience</strong>.
Currently shipping with <strong>Java 25</strong>, <strong>Spring Boot 4.0.6</strong>,
<strong>Spring Security 7</strong>, <strong>Kubernetes</strong>, and <strong>PostgreSQL</strong>.
</p>
<div class="hero-cta">
<a href="#contact" class="btn btn-primary">Get in touch</a>
<a href="#experience" class="btn btn-ghost">View experience</a>
</div>
<div class="hero-meta">
<a href="mailto:i.kopest@gmail.com" class="meta-item">
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z"/><polyline points="22,6 12,13 2,6"/></svg>
i.kopest@gmail.com
</a>
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Braine-l'Alleud, Belgium
</span>
<a href="https://linkedin.com/in/ikopest" target="_blank" rel="noopener" class="meta-item">
<svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor"><path d="M20.45 20.45h-3.55v-5.57c0-1.33-.02-3.04-1.85-3.04-1.85 0-2.13 1.45-2.13 2.94v5.67H9.36V9h3.41v1.56h.05c.47-.9 1.63-1.85 3.36-1.85 3.6 0 4.26 2.37 4.26 5.45v6.29zM5.34 7.43a2.06 2.06 0 1 1 0-4.13 2.06 2.06 0 0 1 0 4.13zM7.12 20.45H3.56V9h3.56v11.45zM22.22 0H1.77C.79 0 0 .77 0 1.72v20.56C0 23.23.79 24 1.77 24h20.45c.98 0 1.78-.77 1.78-1.72V1.72C24 .77 23.2 0 22.22 0z"/></svg>
linkedin.com/in/ikopest
</a>
</div>
</div>
<div class="hero-portrait" aria-hidden="false">
<div class="portrait-frame">
<img src="assets/profile.jpg"
alt="Portrait of Igor Kopestenski"
loading="eager"
decoding="async"
onerror="this.style.display='none'; this.parentElement.classList.add('portrait-fallback');" />
<span class="portrait-initials" aria-hidden="true">IK</span>
</div>
<div class="portrait-glow" aria-hidden="true"></div>
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</div>
<div class="scroll-indicator" aria-hidden="true">
<span></span>
</div>
</section>
<!-- ABOUT -->
<section id="about" class="section reveal">
<div class="container">
<div class="section-header">
<span class="section-number">01</span>
<h2 class="section-title">Professional Profile</h2>
</div>
<div class="about-grid">
<div class="about-text">
<p>
Backend-leaning Java full-stack engineer with <strong>5+ years of carrier-grade
distributed-systems experience</strong>. I deliver true end-to-end features —
UI integration, REST APIs, security, persistence, deployment, and operational resilience.
</p>
<p>
I'm a strong fit for <strong>high-stakes real-time platforms</strong> where correctness,
throughput, security, observability, and failure behavior are business-critical.
My engineering background spans modern JVM services, telecom-grade NAT systems,
distributed edge computing, and embedded RTOS / near-bare-metal runtime environments.
</p>
</div>
<aside class="about-highlights">
<div class="highlight">
<div class="highlight-num">5+</div>
<div class="highlight-label">Years in carrier-grade distributed systems</div>
</div>
<div class="highlight">
<div class="highlight-num">14k+</div>
<div class="highlight-label">Citizens protected via critical vuln disclosure</div>
</div>
<div class="highlight">
<div class="highlight-num">2</div>
<div class="highlight-label">Peer-reviewed publications (ACM, IEEE)</div>
</div>
<div class="highlight">
<div class="highlight-num">M.Sc.</div>
<div class="highlight-label">Computer Science & Engineering, UCLouvain</div>
</div>
</aside>
</div>
</div>
</section>
<!-- SKILLS -->
<section id="skills" class="section reveal">
<div class="container">
<div class="section-header">
<span class="section-number">02</span>
<h2 class="section-title">Core Technical Stack</h2>
</div>
<div class="skills-grid">
<div class="skill-card">
<div class="skill-icon">
<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M16 18l6-6-6-6M8 6l-6 6 6 6"/></svg>
</div>
<h3>Backend / JVM</h3>
<ul class="tag-list">
<li>Java 25</li>
<li>Spring Boot 4.0.6</li>
<li>Spring Security 7</li>
<li>Spring Data</li>
<li>REST APIs</li>
<li>JPA / Hibernate</li>
<li>Maven</li>
</ul>
</div>
<div class="skill-card">
<div class="skill-icon">
<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>
</div>
<h3>Frontend</h3>
<ul class="tag-list">
<li>Angular</li>
<li>TypeScript</li>
<li>HTML</li>
<li>CSS</li>
<li>Backend-driven UI</li>
<li>Integration testing</li>
</ul>
</div>
<div class="skill-card">
<div class="skill-icon">
<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><ellipse cx="12" cy="5" rx="9" ry="3"/><path d="M21 12c0 1.66-4 3-9 3s-9-1.34-9-3M3 5v14c0 1.66 4 3 9 3s9-1.34 9-3V5"/></svg>
</div>
<h3>Data / Persistence</h3>
<ul class="tag-list">
<li>PostgreSQL</li>
<li>SQL</li>
<li>Liquibase-style migrations</li>
<li>Repository / query design</li>
<li>Pagination & filtering</li>
</ul>
</div>
<div class="skill-card">
<div class="skill-icon">
<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 10h-1.26A8 8 0 1 0 9 20h9a5 5 0 0 0 0-10z"/></svg>
</div>
<h3>Cloud-Native / DevOps</h3>
<ul class="tag-list">
<li>Docker</li>
<li>Docker Compose</li>
<li>Kubernetes</li>
<li>GitLab CI/CD</li>
<li>Linux / Unix</li>
<li>Containerized stacks</li>
</ul>
</div>
<div class="skill-card">
<div class="skill-icon">
<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/></svg>
</div>
<h3>Security / Reliability</h3>
<ul class="tag-list">
<li>Secure coding</li>
<li>JWT / RBAC</li>
<li>Vulnerability analysis</li>
<li>Data exposure assessment</li>
<li>Failover & resilience</li>
</ul>
</div>
<div class="skill-card">
<div class="skill-icon">
<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="2" y1="12" x2="22" y2="12"/><path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z"/></svg>
</div>
<h3>Systems Depth</h3>
<ul class="tag-list">
<li>Distributed systems</li>
<li>Carrier-grade NAT</li>
<li>Telemetry / DPI</li>
<li>Erlang / OTP</li>
<li>RTEMS</li>
<li>C / C++</li>
<li>Python, Bash, Tcl</li>
</ul>
</div>
</div>
</div>
</section>
<!-- EXPERIENCE -->
<section id="experience" class="section reveal">
<div class="container">
<div class="section-header">
<span class="section-number">03</span>
<h2 class="section-title">Professional Experience</h2>
</div>
<div class="timeline">
<article class="timeline-item">
<div class="timeline-marker"></div>
<div class="timeline-content">
<div class="timeline-meta">
<span class="timeline-date">2025 — Present</span>
<span class="timeline-location">Belgium</span>
</div>
<h3>Java Full-Stack Developer / IT Consultant</h3>
<h4 class="timeline-company">Centran</h4>
<ul class="timeline-list">
<li>Deliver <strong>end-to-end product features</strong> across Angular UI, Java/Spring backend services, persistence, security, deployment configuration, and operational validation.</li>
<li>Develop backend capabilities with <strong>Java 25, Spring Boot 4.0.6, Spring Security 7, Spring Data</strong>, REST controllers, service-layer logic, repository access, and database-backed workflows.</li>
<li>Implement secure application flows including <strong>JWT-derived identity/role handling</strong>, authorization-sensitive service behavior, and database-backed role / user-state management.</li>
<li>Create and maintain database evolutions using <strong>PostgreSQL, SQL, Spring Data/JPA</strong>, and migration scripts; address query correctness, filtering, pagination, and type-binding defects.</li>
<li>Package and validate multi-service runtime environments with <strong>Docker Compose and Kubernetes-oriented deployment</strong>, improving consistency between development, integration, and deployment.</li>
<li>Independently discovered and escalated a <strong>critical legacy-migration security vulnerability affecting 14,000+ citizens</strong> and sensitive personal data; produced a detailed reproduction report and automation-assisted evidence collection.</li>
<li>Operate with a <strong>backend-first engineering profile</strong> focused on security, performance, resilience, maintainability, and correctness under scale.</li>
</ul>
</div>
</article>
<article class="timeline-item">
<div class="timeline-marker"></div>
<div class="timeline-content">
<div class="timeline-meta">
<span class="timeline-date">Oct 2020 — Jul 2025</span>
<span class="timeline-location">Antwerp, Belgium</span>
</div>
<h3>Software QA Engineer — NAT, Distributed Systems Reliability & Platform Security</h3>
<h4 class="timeline-company">Nokia Bell NV</h4>
<ul class="timeline-list">
<li>Lead quality and automation work for <strong>Nokia SR OS carrier-grade NAT</strong>, validating session management, port allocation, scale behavior, telemetry, failover, and high-availability across multiple releases.</li>
<li>Design and maintain <strong>automated test suites and complex multi-router / host-simulation scenarios</strong> for Tier-1 service-provider environments with strict uptime and correctness requirements.</li>
<li>Partner with development teams on test strategy, defect isolation, regression scope, and release confidence for platform changes in highly distributed networking software.</li>
<li>Validate <strong>security-relevant features, DPI integration, telemetry/monitoring</strong> behavior, and operational state transitions, reducing risk in production-grade network environments.</li>
<li>Translate deep QA findings into engineering feedback by reproducing defects, characterizing failure modes, verifying fixes, and protecting customer-facing reliability at carrier scale.</li>
</ul>
</div>
</article>
<article class="timeline-item">
<div class="timeline-marker"></div>
<div class="timeline-content">
<div class="timeline-meta">
<span class="timeline-date">Jan 2020 — Oct 2020</span>
<span class="timeline-location">Louvain-la-Neuve, Belgium</span>
</div>
<h3>Research Engineer & Project Co-Supervisor — Achlys IoT Edge Computing</h3>
<h4 class="timeline-company">UCLouvain</h4>
<ul class="timeline-list">
<li>Co-led research and engineering work on <strong>Achlys</strong>, an IoT edge-computing framework for distributed applications on resource-constrained hardware.</li>
<li>Supervised graduate work and developed distributed IoT capabilities using <strong>Erlang/OTP and GRiSP platforms</strong>, including sensor-data fusion and large-scale edge-computing scenarios.</li>
<li>Integrated low-level debugging capabilities into embedded runtime systems using <strong>Erlang on RTEMS</strong>, bridging application-level distributed systems with RTOS-level execution constraints.</li>
</ul>
</div>
</article>
<article class="timeline-item">
<div class="timeline-marker"></div>
<div class="timeline-content">
<div class="timeline-meta">
<span class="timeline-date">Sep 2018 — Jan 2020</span>
<span class="timeline-location">Louvain-la-Neuve, Belgium</span>
</div>
<h3>Research Assistant & Developer — LightKone H2020 Distributed Edge Computing</h3>
<h4 class="timeline-company">UCLouvain</h4>
<ul class="timeline-list">
<li>Developed core components of the <strong>Achlys framework</strong> for reliable storage and generic computation at the IoT edge, contributing to official project deliverables and publications.</li>
<li>Implemented networking and performance-oriented functionality including <strong>ad-hoc wireless communication, sensor integration, and wireless-channel utilization improvements</strong> on real hardware (single-core ARM Cortex @ 400 MHz, 64 MB memory).</li>
</ul>
</div>
</article>
</div>
</div>
</section>
<!-- POSITIONING -->
<section class="section section-tight reveal">
<div class="container">
<div class="positioning-card">
<h2 class="positioning-title">Selected Engineering Positioning</h2>
<ul class="positioning-list">
<li>Strong alignment with <strong>real-time gaming / betting / fintech platforms</strong>: high availability, secure data handling, throughput under load, operational resilience, rapid defect isolation, and regulated-risk awareness.</li>
<li>Unusual engineering range: <strong>Angular/UI integration, Java/Spring services, databases, containers, distributed telecom systems, Erlang edge computing, C/C++ systems work, and RTOS-level runtime exposure.</strong></li>
<li><strong>Publication-backed distributed-systems credibility</strong> combined with practical delivery in current Java/Spring and containerized environments.</li>
</ul>
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<span class="section-number">04</span>
<h2 class="section-title">Education, Publications & Talks</h2>
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<div>
<h3 class="subtitle">Education</h3>
<div class="card">
<div class="card-header">
<h4>M.Sc. in Computer Science and Engineering</h4>
<span class="card-date">2018</span>
</div>
<p class="card-sub">UCLouvain — Université catholique de Louvain, Belgium</p>
</div>
<div class="card">
<div class="card-header">
<h4>B.Sc. in Computer Science and Management <span class="badge">cum laude</span></h4>
<span class="card-date">2016</span>
</div>
<p class="card-sub">Institut Paul Lambin — Haute École Léonard de Vinci, Belgium</p>
</div>
</div>
<div>
<h3 class="subtitle">Publications</h3>
<a class="card card-link" href="https://doi.org/10.1145/3331542.3342567" target="_blank" rel="noopener">
<div class="card-header">
<h4>Erlang as an Enabling Technology for Resilient General-Purpose Applications on Edge IoT Networks</h4>
<span class="card-date">2019</span>
</div>
<p class="card-sub">ACM SIGPLAN International Workshop on Erlang</p>
<p class="card-doi">DOI: 10.1145/3331542.3342567</p>
</a>
<a class="card card-link" href="https://doi.org/10.1109/PERCOMW.2019.8730773" target="_blank" rel="noopener">
<div class="card-header">
<h4>Achlys: Towards a Framework for Distributed Storage and Generic Computing Applications for Wireless IoT Edge Networks with Lasp on GRiSP</h4>
<span class="card-date">2019</span>
</div>
<p class="card-sub">IEEE PerCom Workshops</p>
<p class="card-doi">DOI: 10.1109/PERCOMW.2019.8730773</p>
</a>
<h3 class="subtitle subtitle-spaced">Selected Talks</h3>
<div class="card card-talk">
<div class="card-header">
<h4>IoT Edge Computing with bare-metal Erlang</h4>
<span class="card-date">2019</span>
</div>
<p class="card-sub">CodeBEAM Amsterdam</p>
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<h2>Let's build something resilient.</h2>
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