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<meta name="description" content="Mira Kovač — Senior Machine Learning Engineer in Berlin. Building useful, reliable machine learning systems from first experiment to production.">
<title>Mira Kovač — Machine Learning Engineer</title>
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<div class="shell">
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<a class="wordmark" href="#" aria-label="Mira Kovač, back to top">mk<span class="green">_</span></a>
<nav aria-label="Main navigation">
<a href="#experience">experience</a>
<a href="#projects">projects</a>
<a href="#contact">contact</a>
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<main id="main">
<section class="intro" aria-labelledby="name">
<div class="eyebrow"><span class="green" aria-hidden="true">></span> hello, world<span class="cursor" aria-hidden="true">_</span></div>
<h1 id="name">Mira Kovač<span class="green name-dot">.</span></h1>
<p class="role">Senior Machine Learning Engineer</p>
<div class="intro-meta"><span><svg viewBox="0 0 24 24" aria-hidden="true"><path d="M19 10c0 5-7 11-7 11S5 15 5 10a7 7 0 1 1 14 0Z"></path><circle cx="12" cy="10" r="2.5"></circle></svg>Berlin, Germany</span><span class="meta-divider" aria-hidden="true">/</span><span>2017 — present</span></div>
<p class="summary">I build ML systems that hold up outside the notebook.<br class="desktop-break"> My focus: recommendations, retrieval, and the engineering<br class="desktop-break"> that gets good models into production.</p>
<div class="intro-bottom"><span class="comment">// a little research. a lot of shipping.</span><a class="text-link" href="#contact">let’s talk <span aria-hidden="true">↗</span></a></div>
</section>
<section id="experience" class="section" aria-labelledby="experience-title">
<div class="section-heading"><h2 id="experience-title"><span class="section-number">01 /</span> experience</h2><span class="section-note">9 years of building</span></div>
<div class="timeline">
<article class="timeline-item">
<div class="year"><span>2022</span><span class="year-end">present</span></div>
<div class="role-content">
<div class="job-heading"><h3>Senior Machine Learning Engineer</h3><span class="current-label">current</span></div>
<p class="company">Zalando <span class="company-location">/ Berlin</span></p>
<ul>
<li>Led a two-stage product retrieval pipeline using dual-encoder embeddings and a learning-to-rank model; improved add-to-cart rate by 4.6% in a six-week A/B test.</li>
<li>Cut p95 inference latency from 140 ms to 65 ms through model distillation, batched inference, and a shared feature cache.</li>
<li>Introduced slice-level evaluation and drift alerts for cold-start products, with canary releases and automated rollback gates.</li>
</ul>
<p class="stack">PyTorch · Spark · Kubernetes · MLflow</p>
</div>
</article>
<article class="timeline-item">
<div class="year"><span>2019</span><span class="year-end">2022</span></div>
<div class="role-content">
<h3>Machine Learning Engineer</h3>
<p class="company">Delivery Hero <span class="company-location">/ Berlin</span></p>
<ul>
<li>Built gradient-boosted delivery-time models with calibrated prediction intervals; reduced median absolute error by 18% against the production baseline.</li>
<li>Reworked training data joins to prevent point-in-time leakage and added feature parity checks between offline training and online serving.</li>
<li>Owned weekly retraining and shadow deployments across six markets, partnering with operations teams to monitor errors during peak demand.</li>
</ul>
<p class="stack">Python · LightGBM · Airflow · BigQuery</p>
</div>
</article>
<article class="timeline-item">
<div class="year"><span>2017</span><span class="year-end">2019</span></div>
<div class="role-content">
<h3>Data Scientist</h3>
<p class="company">SoundCloud <span class="company-location">/ Berlin</span></p>
<ul>
<li>Developed implicit-feedback recommendation baselines and temporal evaluation splits for personalized track discovery.</li>
<li>Designed listening-session metrics and analyzed online experiments, helping the team distinguish short-term plays from repeat listening.</li>
</ul>
<p class="stack">Python · SQL · scikit-learn · Spark</p>
</div>
</article>
</div>
</section>
<section id="skills" class="section" aria-labelledby="skills-title">
<div class="section-heading"><h2 id="skills-title"><span class="section-number">02 /</span> toolkit</h2><span class="section-note">tools, not trophies</span></div>
<ul class="skills" aria-label="Skills"><li>Python</li><li>PyTorch</li><li>SQL</li><li>Recommendation systems</li><li>Vector retrieval</li><li>Experiment design</li><li>ML infrastructure</li><li>Kubernetes</li></ul>
</section>
<section id="projects" class="section" aria-labelledby="projects-title">
<div class="section-heading"><h2 id="projects-title"><span class="section-number">03 /</span> side projects</h2><span class="section-note">after hours</span></div>
<div class="project-list">
<details class="project"><summary><span class="project-index">001</span><span class="project-main"><span class="project-title">driftwatch</span><span class="project-description">A lightweight CLI for catching feature drift before it becomes model drift.</span></span><span class="expand-icon" aria-hidden="true">+</span></summary><div class="project-detail"><p>Compares reference and production samples using PSI and Wasserstein distance, then writes a compact HTML report. Includes minimum-sample checks to keep small batches from triggering noisy alerts.</p><span class="stack">Python · SciPy · Typer</span></div></details>
<details class="project"><summary><span class="project-index">002</span><span class="project-main"><span class="project-title">needle</span><span class="project-description">A reproducible benchmark for vector search latency, recall, and memory.</span></span><span class="expand-icon" aria-hidden="true">+</span></summary><div class="project-detail"><p>Runs exact and approximate nearest-neighbor search against the same embedding corpus. Reports recall@10 and p95 latency across index sizes, with fixed seeds and versioned configurations.</p><span class="stack">Python · FAISS · NumPy</span></div></details>
<details class="project"><summary><span class="project-index">003</span><span class="project-main"><span class="project-title">small-batch</span><span class="project-description">A practical collection of ML experiments that fit on a single GPU.</span></span><span class="expand-icon" aria-hidden="true">+</span></summary><div class="project-detail"><p>Small, documented experiments in embedding distillation and contrastive learning. Every experiment includes a baseline, an ablation, a compute budget, and notes on what failed.</p><span class="stack">PyTorch · Hydra · Weights & Biases</span></div></details>
</div>
</section>
<section id="publication" class="section" aria-labelledby="publication-title">
<div class="section-heading"><h2 id="publication-title"><span class="section-number">04 /</span> publication</h2><span class="section-note">notes from the field</span></div>
<details class="publication"><summary><span class="publication-content"><span class="publication-meta">TECHNICAL REPORT / 2023</span><span class="publication-name">Beyond offline accuracy: evaluating<br class="desktop-break"> retrieval under catalog shift</span><span class="publication-author">Mira Kovač · Independent research</span></span><span class="expand-icon" aria-hidden="true">+</span></summary><div class="publication-detail"><p>An evaluation protocol for recommendation retrieval when products enter and leave the catalog. The report compares random and temporal splits, measures new-item coverage alongside recall@K, and examines when offline gains fail to carry into production.</p><p class="comment">Keywords: temporal evaluation, cold start, recommendation systems.</p></div></details>
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<div class="section-heading"><h2 id="contact-title"><span class="section-number">05 /</span> contact</h2><span class="section-note">start a conversation</span></div>
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