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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>Serhii Lekariev — CV</title>

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<body>
  <h1>Serhii Lekariev</h1>
  <p class="lead">
    Backend / platform engineer. Scala/FP-heavy systems, data ingestion, and blockchain tooling (Cardano).
  </p>

  <h2>Contacts</h2>
  <div class="contacts">
    <ul>
      <li>Email: <a href="mailto:serhii.lekariev@gmail.com">serhii.lekariev@gmail.com</a></li>
      <li><a href="https://t.me/saeryan">Telegram</a></li>
    </ul>
  </div>

  <h2>Competencies</h2>
  <div class="section">
    <p>Professional:</p>
    <ul>
      <li>Scala (FP stack: cats, cats-effect, fs2)</li>
      <li>Java, Kotlin</li>
      <li>Rust (tokio ecosystem)</li>
      <li>JavaScript / TypeScript</li>
      <li>Distributed systems: ingestion pipelines, message brokers, reliability work</li>
      <li>Cloud & infra: GCP, AWS, Kubernetes</li>
    </ul>

    <p>Personal / occasional:</p>
    <ul>
      <li>Deep learning</li>
      <li>Clojure, Elixir</li>
      <li>Blockchain tooling</li>
      <li>Arduino</li>
    </ul>
  </div>

  <h2>Experience</h2>
  <ul class="role-list">
    <li class="role">
      <div class="role-header">
        <div>
          <span class="company">Lantr</span>
          <span class="title"> — Engineer (Cardano R&amp;D)</span>
        </div>
        <div class="dates">Jul 2025 - Present</div>
      </div>

      <div class="desc">
        <p>Cardano R&amp;D lab. Core contribution to the SOTA Scala dApp development platform.</p>
        <ul>
          <li>Transaction builder R&D and implementation.</li>
          <li>Supported CIPs.</li>
          <li>Drove research grant deliverables to completion.</li>
        </ul>
      </div>
    </li>

    <li class="role">
      <div class="role-header">
        <div>
          <span class="company">Betby</span>
          <span class="title"> — Technical Lead</span>
        </div>
        <div class="dates">Aug 2022 - Jul 2025</div>
      </div>

      <div class="desc">
        <p>Led a team of 5. Owned critical ingestion components; designed and maintained the provider-integration architecture.</p>
        <ul>
          <li>Owned multiple key data-ingestion paths (throughput, ordering, retries, failure modes).</li>
          <li>Set integration standards and libraries to reduce inconsistent match states and data corruption.</li>
          <li>Mentored and taught Scala/FP to OOP-heavy engineers (practical cats-effect/fs2).</li>
          <li>Stack: Scala (fs2, cats, cats-effect, kyo), on-prem Kubernetes, MongoDB, RabbitMQ + Kafka.</li>
        </ul>
      </div>
    </li>

    <li class="role">
      <div class="role-header">
        <div>
          <span class="company">Zoolatech</span>
          <span class="title"> — Scala Engineer</span>
        </div>
        <div class="dates">Nov 2021 - Aug 2022</div>
      </div>

      <div class="desc">
        <p>Backend work for warehousing optimization: integrations, reliability fixes, and ongoing maintenance.</p>
        <ul>
          <li>Integrated new warehouses; kept existing integrations stable under change.</li>
          <li>Improved codebase quality (tests, refactors, operational fixes).</li>
          <li>Mentor at Zoola Academy: wrote lectures and assignments; reviewed student work and materials.</li>
          <li>Stack: Scala + cats, GCP, Postgres, Kafka.</li>
        </ul>
      </div>
    </li>

    <li class="role">
      <div class="role-header">
        <div>
          <span class="company">NDA travel company</span>
          <span class="title"> — Big Data Engineer</span>
        </div>
        <div class="dates">Feb 2021 - Nov 2021</div>
      </div>

      <div class="desc">
        <p>Built and supported data pipelines for analytics and data science consumption.</p>
        <ul>
          <li>Java/Scala pipelines across a typical big-data stack (Spark/Hadoop/Hive/Airflow).</li>
          <li>AWS; storage in Redis and DynamoDB (plus supporting systems).</li>
        </ul>
      </div>
    </li>

    <li class="role">
      <div class="role-header">
        <div>
          <span class="company">Sprout Therapy</span>
          <span class="title"> — Rust Engineer</span>
        </div>
        <div class="dates">Aug 2020 - Feb 2021</div>
      </div>

      <div class="desc">
        <p>Early-stage product team building healthcare software for US doctors and patients.</p>
        <ul>
          <li>Rust backend (tokio). AWS deployment.</li>
          <li>Code review, onboarding, test discipline, and documentation work.</li>
        </ul>
      </div>
    </li>

    <li class="role">
      <div class="role-header">
        <div>
          <span class="company">TeamDev</span>
          <span class="title"> — Software Engineer</span>
        </div>
        <div class="dates">Aug 2018 - Aug 2020</div>
      </div>

      <div class="desc">
        <p>Worked on <a href="https://spine.io/">Spine</a> (event-sourcing framework) and product development at open-source quality.</p>
        <ul>
          <li>Open source-grade code, tests, and documentation.</li>
          <li>Built <a href="https://purephotos.app/">purephotos.app</a>: frontend + backend; infra problem-solving; PoCs; ML pipeline integration.</li>
          <li>Stack: Java backend, Vue + TypeScript frontend, GCP.</li>
        </ul>
      </div>
    </li>
  </ul>
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