Senior Staff Algorithm Engineer, Recommendation at OKX

<div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb"> <div data-page-id="ICg8dcrqNohbEMxVh0Tusc7hsZz" data-lark-html-role="root" data-docx-has-block-data="false"> <h2 class="heading-2 ace-line old-record-id-SOJTdq885oxPNjxXfuquxFfSsLW"><strong>Who We Are</strong></h2> </div> At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom.</div> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">&nbsp;</div> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves.</div> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">&nbsp;</div> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">Across our multiple offices globally, we are united by our core principles:&nbsp;<em>We Before Me</em>,&nbsp;<em>Do the Right Thing</em>, and&nbsp;<em>Get Things Done</em>. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er.</div> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">&nbsp;</div> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more.</div> <div data-page-id="UdzSdrVlAoctZ7xkfZfl7kzSguc" data-lark-html-role="root" data-docx-has-block-data="false"> <div data-page-id="AElmd7ROGoLWzpxHjonlx1svgMb" data-lark-html-role="root" data-docx-has-block-data="false"> <div data-page-id="DVjId5NPOownzcxbm4TlBLXXgod" data-lark-html-role="root" data-docx-has-block-data="false"> <div data-page-id="LaTVdpZW0otpxix3itFlFyqrgOg" data-lark-html-role="root" data-docx-has-block-data="false"> <h3 class="heading-2 ace-line old-record-id-C4YPdBHhno66LcxmulglJo3hgkb"><br>About the Role</h3> <div class="ace-line ace-line old-record-id-OpgxdBi1qoKLszxfzBBlLDIWg5e">You will own the technical direction of OKX's next-generation social feed recommendation system — evolving it from a content feed into a unified recommendation engine that surfaces both content and platform features. Your decisions directly shape the experience of tens of millions of users and drive platform trading conversion.</div> <h3 class="heading-2 ace-line old-record-id-ViCUdbUiZoTj63xbYsFlmBKlgsb"><br>Responsibilities</h3> <ul class="list-bullet1"> <li class="ace-line ace-line old-record-id-IHJHdlWC9oN2awxo52Cle56Wg1d" data-list="bullet"> <div><strong>Elevate the Ranking System</strong> — Drive continuous ranking model iteration with measurable impact on user retention and trading conversion</div> </li> <li class="ace-line ace-line old-record-id-PxVEdiZdHojs6Ex4D2kl9jn5gae" data-list="bullet"> <div><strong>Unify User Understanding</strong> — Build a cross-domain intent framework spanning content consumption, feature usage, and search, shifting the system from "what users clicked" to "what users are trying to do"</div> </li> <li class="ace-line ace-line old-record-id-D9vydELsYoSKwHxjjZ0lkbo9gFh" data-list="bullet"> <div><strong>Define the Technical Roadmap</strong> — Chart and execute a 12–24 month evolution from Transformer-based ranking toward generative recommendation (sequence generation + preference alignment)</div> </li> <li class="ace-line ace-line old-record-id-Z7mcdQlFoo4i1cxgdoqlAVLygNf" data-list="bullet"> <div><strong>Pioneer the Agent Paradigm</strong> — Integrate recommendation and search capabilities into an LLM Agent framework, enabling proactive intent fulfillment rather than passive content delivery</div> </li> </ul> <h3 class="heading-2 ace-line old-record-id-BQ0HdsKW4oepeJx7Xr1l6b9Rgpf"><br>Requirements</h3> <ul class="list-bullet1"> <li class="ace-line ace-line old-record-id-ChP2dL0Xso0LimxzlDilvH0Sg3b" data-list="bullet"> <div><strong>Background</strong> — Master's or above in CS / Math from a top university; 8+ years of experience with 5+ years in core recommendation / search roles; track record of owning end-to-end recommendation pipelines at 10M+ DAU scale</div> </li> <li class="ace-line ace-line old-record-id-C5GBduMu9o1cjjxJc6flXrhEgzh" data-list="bullet"> <div><strong>User Intent &amp; Profiling (Core)</strong> — Experience designing unified intent representations across heterogeneous domains (content / feature / search); ability to fuse real-time behavioral signals with long-term stable preferences; hands-on experience with tiered user profile systems (cold-start → interest exploration → stable preference)</div> </li> <li class="ace-line ace-line old-record-id-TKfmdkRfLoGs9xxmbqIlRBykgHd" data-list="bullet"> <div><strong>Transformer &amp; Ranking (Core)</strong> — Deep understanding of Attention mechanisms in sequential behavior modeling and their limitations (DIN / SIM / HSTU evolution); ability to propose independent solutions under engineering constraints; proficiency in Listwise losses (ListMLE / Softmax Loss) and joint multi-candidate ranking</div> </li> <li class="ace-line ace-line old-record-id-Rm6RdJGm4oGjNuxdgyql6b4egDh" data-list="bullet"> <div><strong>Multi-Task Training (Core)</strong> — Expert-level knowledge of MMoE / PLE / ESMM and gradient conflict identification and mitigation; ability to design composite loss function frameworks from scratch; proven methodology for bridging offline metrics (AUC / NDCG) and online business KPIs</div> </li> <li class="ace-line ace-line old-record-id-H5QHdRgyZoORhgxG5WClrJw2gGc" data-list="bullet"> <div><strong>Business </strong><strong>Attribution</strong><strong> (Core)</strong> — Hands-on Uplift Modeling experience; proficiency in Position / Selection Bias correction and prediction probability Calibration</div> </li> <li class="ace-line ace-line old-record-id-Ab0IdZXk5oq5iIxE33vlslPDgne" data-list="bullet"> <div><strong>Generative Recommendation (Strong Plus)</strong> — Understanding of Semantic Tokenization (FSQ / RQ-VAE) and conditional sequence generation; working-level knowledge of RLHF / DPO applied to recommendation systems</div> </li> <li class="ace-line ace-line old-record-id-XKHvdHuUQoRdqPxE1FflxOLzgXe" data-list="bullet"> <div><strong>Recommendation &amp; Search Agent (Strong Plus)</strong> — Engineering experience with LLM Agent frameworks (Tool Use / ReAct); ability to define the collaboration boundary between Agent-based and traditional recommendation; experience designing systems that translate natural language intent into structured retrieval requests</div> </li> <li class="ace-line ace-line old-record-id-OYf4djqI7osioFxBZKBlpUmggqd" data-list="bullet"> <div><strong>Engineering</strong> — Large-scale distributed training (10B+ parameter models); real-time feature engineering (Flink / Kafka); inference optimization under strict latency SLA</div> </li> </ul> <h3 class="heading-2 ace-line old-record-id-ROHtd7qKxo0sFgxnaitlRI6Pgoe"><br>Bonus</h3> <div class="ace-line ace-line old-record-id-G9qRdqhwYoH2cCxph0olipeOgwb">First-author publication at RecSys / KDD / WWW ｜ Bandit / RL production deployment ｜ Background in fintech / crypto</div> </div> </div> </div> </div> <h3><strong><br>Perks &amp; Benefits</strong></h3> <ul> <li>Competitive total compensation package</li> <li>L&amp;D programs and education subsidy for employees' growth and development</li> <li>Various team building programs and company events</li> <li>Wellness and meal allowance</li> <li>Comprehensive healthcare schemes for employees and dependants</li> <li>More that we love to tell you along the process!</li> </ul> <p><em><span class="text-only text-font-italic" data-eleid="32"><span class="text-only"><br>Please note that Hong Kong is a group-level service hub, and&nbsp;</span><span class="text-only text-with-abbreviation text-with-abbreviation-bottomline">OKX</span><span class="text-only">&nbsp;does not carry on a business of operating a virtual asset trading platform in Hong Kong.</span></span></em></p> <p>&nbsp;</p><div class="content-conclusion"><div data-lark-html-role="root"><span class="text-only" data-eleid="18"><span class="text-only"><span class="text-only" data-eleid="6">Notice:<br></span></span></span> <div data-lark-html-role="root"><span class="text-only" data-eleid="26"><span class="text-only">All official </span><span class="text-only text-with-abbreviation text-with-abbreviation-bottomline">OKX</span><span class="text-only"> vacancies are published on this website.</span></span> <span class="text-only" data-eleid="28"><span class="text-only">While roles may appear on selected third-party platforms from time to time, information on other sites may be inaccurate or outdated. </span></span><strong><span class="text-only" data-eleid="29"><span class="text-only">If in doubt, please apply directly through our official careers website.</span></span></strong></div> </div> <div data-lark-html-role="root"><span class="text-only" data-eleid="18"><span class="text-only">Information collected and processed as part of the recruitment process of any job application you choose to submit is subject to&nbsp;</span><span class="text-only text-with-abbreviation text-with-abbreviation-bottomline">OKX</span><span class="text-only">'s </span></span><a class="link rich-text-anchor __anchor-intercept-flag__ text-content-link" href="https://www.okx.com/en-eu/help/okx-candidate-privacy-notice" target="_blank" data-eleid="19" data-lark-is-custom="true" data-lark-link="true">Candidate Privacy Notice</a><span class="text-only" data-eleid="20"><span class="text-only">.</span></span></div></div>