Senior / Staff Software Engineer, Mobile — Core (Messaging)

<div class="ace-line ace-line old-record-id-doxus3bYvV5DS6icDHnquWbEcNb"> <div class="ace-line ace-line old-record-id-doxus3bYvV5DS6icDHnquWbEcNb">OKX will be prioritising applicants who have a current right to work in Hong Kong, and do not require OKX's sponsorship of a visa.</div> <div class="ace-line ace-line old-record-id-doxussQumjJyp0pDHcFh7Y3bH0b">&nbsp;</div> <h2 class="heading-2 ace-line old-record-id-doxusl2cgB8vs7Q3ent4HKPgocd"><strong>Who We Are</strong></h2> <div data-page-id="Kpucdjv7JoAcSZxSf7PuRl5Yscb" data-lark-html-role="root" data-docx-has-block-data="false"> <div class="ace-line ace-line old-record-id-Cfb8dvi9voxFkWxhNcmuJX50sZb">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.&nbsp;</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: <em>We Before Me</em>, <em>Do the Right Thing</em>, and <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.<br><br></div> </div> <div data-page-id="OvVyd3xPZo5hNhxbppju7P8isgg" data-docx-has-block-data="false"> <div class="ace-line ace-line old-record-id-CzjQdI1IWofbWMxmIahu6dAMsjc"> <div data-page-id="Q5McdBHqRos9a1xglGGuWZx7sgc" data-docx-has-block-data="false"> <h2 class="heading-2 ace-line old-record-id-doxusl2cgB8vs7Q3ent4HKPgocd"><strong>About The Team</strong></h2> <p>Own OKX's in-app messaging end to end — from a&nbsp;<strong>fully in-house IM engine</strong> to a <strong>messaging platform</strong> powering community chat, payments, VIP service, and user-to-agent (AI) chat for millions. The more senior you are, the more you set the technical direction others build on.<br><br></p> <h2 class="heading-2 ace-line old-record-id-doxusl2cgB8vs7Q3ent4HKPgocd"><strong>What You'll Be Doing</strong></h2> <div data-page-id="RUSvdBNACos6VNxuB6wl7GaCg2f" data-lark-html-role="root" data-docx-has-block-data="false"> <ul class="list-bullet1"> <li class="ace-line ace-line old-record-id-Vmegdp0esoQqaVx5ctWl7hlhgVg" data-list="bullet"> <div><strong>Build our multi-platform unified IM </strong><strong>SDK</strong> — unify the logic core across platforms and push performance and stability as a lever for growth.</div> </li> <li class="ace-line ace-line old-record-id-Zb6zdhFSZo9I1mxkvlel91XIgQf" data-list="bullet"> <div><strong>Platformize the engine</strong> — turn it into a platform that product teams build business scenarios on (community chat, payments, VIP service).</div> </li> <li class="ace-line ace-line old-record-id-S71td2mDeosf2KxfY1klwexigbf" data-list="bullet"> <div><strong>Build user-to-agent (AI) chat</strong> — the conversational AI surface on top of IM, from real-time delivery to the agent interaction experience.</div> </li> <li class="ace-line ace-line old-record-id-RrkTdxi29o3DHJxASOblaNmygBe" data-list="bullet"> <div><strong>Own delivery end-to-end</strong> — real-time WebSocket long-connection and offline push across overseas + China vendor channels — so messages reach users whether the app is open or not.</div> </li> <li class="ace-line ace-line old-record-id-DzG7dkiikoKYJcxJpOilsfoYg4u" data-list="bullet"> <div><strong>Push latency, reliability, and battery/memory</strong> to their limits under real production and weak-network conditions.</div> </li> <li class="ace-line ace-line old-record-id-RSqud0veDoINJKxbmOZlThukgQb" data-list="bullet"> <div><strong>Build our AI-native engineering practice</strong> — design automated development workflows and harness systems (agents, evals, guardrails, CI integration) that let AI do real engineering work, while safeguarding delivery quality and efficiency.</div> </li> <li class="ace-line ace-line old-record-id-GA4zdNZvEoJBbvxpl7allKWHglh" data-list="bullet"> <div><strong>Raise the bar </strong>through design and code review, and by making the engineers around you better.</div> </li> <li class="ace-line ace-line old-record-id-UZ1Sd20h5olPLYxjHVAlAXH9gsd" data-list="bullet"> <div>At the Staff level: set technical direction beyond your own area and drive cross-team decisions that shape the IM platform.</div> </li> </ul> </div> <h2 class="heading-2 ace-line old-record-id-doxusJHbXag5ngXLLiXggj1zhBg"><strong>What We Look For In You</strong></h2> <div data-page-id="RUSvdBNACos6VNxuB6wl7GaCg2f" data-lark-html-role="root" data-docx-has-block-data="false"> <ul class="list-bullet1"> <li class="ace-line ace-line old-record-id-DNKpdfLzDomPabxkYtmlTdWFgu3" data-list="bullet"> <div>Deep, hands-on experience building <strong>native iOS and/or Android</strong> — you understand the platform, not just a framework on top of it.</div> </li> <li class="ace-line ace-line old-record-id-ZVaRdaibJo2ncnxhM64lkOQPgmd" data-list="bullet"> <div>Experience with a <strong>cross-platform / shared business-logic layer</strong>. We build ours in <strong>Rust + UniFFI</strong>; direct Rust-on-mobile experience is a strong plus, but experience with any shared-logic approach — <strong>KMP, Flutter, or React Native</strong> — transfers well and is valued.</div> </li> <li class="ace-line ace-line old-record-id-Vgysdbo5uoRwm2xhD3klRnIqgTe" data-list="bullet"> <div>Fluent in at least one of: <strong>Swift / Kotlin / Rust / Objective-C / Java / JavaScript</strong>, with strong CS fundamentals.</div> </li> <li class="ace-line ace-line old-record-id-EvYadC9lgoLRyQxqU2GlDZyLgvc" data-list="bullet"> <div><strong>Architecture experience with large-scale mobile apps</strong> — you've applied maintainable design patterns and own solutions from requirements through to production.</div> </li> <li class="ace-line ace-line old-record-id-W3lydrIGoomwQOxd7CuloNcEg3f" data-list="bullet"> <div><strong>Depth in at least one layer of the messaging stack, and the ability to work across both</strong> — whether your strength is chat/feature-level UX or real-time / networking internals: WebSocket / long-connection, and/or offline push delivery across overseas + China channels (APNs, FCM, and China vendor push). Bonus if you have the depth to reason about a messaging engine from the ground up, not just consume one.</div> </li> <li class="ace-line ace-line old-record-id-Zz4ldNJEToVIHzxz6i9lLvj4g4c" data-list="bullet"> <div>Strong <strong>mobile performance</strong> chops (memory, battery, concurrency, weak-network).</div> </li> <li class="ace-line ace-line old-record-id-AVmzdXYaSoaKeYxzzQLlxfCXgWg" data-list="bullet"> <div><strong>You apply AI deeply in your own engineering — not just code generation</strong>. You've built, or are driven to build, automated development workflows and harnesses that make delivery both faster and more reliable. Solid grasp of LLM fundamentals, prompt engineering, RAG, and agent concepts, with hands-on experience taking an AI pipeline from scratch to shipped — and you're excited to build user-facing conversational / agent-chat experiences too.</div> </li> <li class="ace-line ace-line old-record-id-NgUkdmj7noIvhexihVel0i3igof" data-list="bullet"> <div>Comfortable with <strong>ambiguity and high scale</strong> — you've debugged problems that only appear under real production load.</div> </li> <li class="ace-line ace-line old-record-id-FLY5dUBM6oAiIvxnoY7lWjuighh" data-list="bullet"> <div>Signals we value: you naturally <strong>raise the standard of teams you join</strong>, mentor without being asked, and can grow into a technical anchor for the group.</div> </li> </ul> </div> <h2 class="heading-2 ace-line old-record-id-doxusKUjfoqh7QZ5RVAXhjX7gig"><strong>Nice-To-Haves</strong></h2> <div data-page-id="EJEWdyXsfojXT9xHKfDuSPpSswb" data-docx-has-block-data="false"> <div data-page-id="IwA0dvhKMo2zqdxUm6sux6uxsbb" data-lark-html-role="root" data-docx-has-block-data="false"> <div data-page-id="IwA0dvhKMo2zqdxUm6sux6uxsbb" data-lark-html-role="root" data-docx-has-block-data="false"> <div data-page-id="RUSvdBNACos6VNxuB6wl7GaCg2f" data-lark-html-role="root" data-docx-has-block-data="false"> <ul class="list-bullet1"> <li class="ace-line ace-line old-record-id-ZyTvdhozfox3pax3gRRlNJbcgOe" data-list="bullet"> <div>Built or maintained an <strong>IM / chat product, or an </strong><strong>SDK</strong><strong> consumed by other teams</strong>.</div> </li> <li class="ace-line ace-line old-record-id-AWuSdODTCoQsGGxLegHln8B6gEL" data-list="bullet"> <div>Experience with <strong>mini-program or dynamic/hot-update frameworks</strong>.</div> </li> <li class="ace-line ace-line old-record-id-KoSqdscvVomC62xb29Klog2egoe" data-list="bullet"> <div>Crypto trading / Web3 experience.</div> </li> </ul> </div> </div> </div> </div> </div> </div> <div class="ace-line ace-line old-record-id-Avh0dL0UvoHyoFxymwmuPqtAsWe"> <h2 class="heading-2 ace-line old-record-id-doxusxvzyTH4iZpRPTygm6sKzcf"><strong>Perks &amp; Benefits</strong></h2> <ul class="list-bullet1"> <li class="ace-line ace-line old-record-id-doxus9Bu8Z2VOqDK5F51723OA8g" data-list="bullet"> <div>Competitive total compensation package</div> </li> <li class="ace-line ace-line old-record-id-doxusB7tdGuv2SmCPjgmCN3Jb1c" data-list="bullet"> <div>L&amp;D programs and Education subsidy for employees' growth and development</div> </li> <li class="ace-line ace-line old-record-id-doxusZTvzFyB7VKd89mBtiKL9ob" data-list="bullet"> <div>Various team building programs and company events</div> </li> <li class="ace-line ace-line old-record-id-doxus4VLa66AV1kBqr1XQp7CFec" data-list="bullet"> <div>Wellness and meal allowances</div> </li> <li class="ace-line ace-line old-record-id-doxusktLuOm7fBzEDlSg6b719qf" data-list="bullet"> <div>Comprehensive healthcare schemes for employees and dependants</div> </li> <li class="ace-line ace-line old-record-id-doxusXaQ6LYBcrJKsuq40ykOyNr" data-list="bullet"> <div>More that we love to tell you along the process!</div> </li> </ul> <div data-page-id="PNNZdiw4Yo1ZOmx8btbucw8qsLG" data-lark-html-role="root" data-docx-has-block-data="false"> <div class="ace-line ace-line old-record-id-SeyrdixubojqOkxotwguoGKpsN2">&nbsp;</div> <div class="ace-line ace-line old-record-id-SeyrdixubojqOkxotwguoGKpsN2"> <div data-page-id="PNNZdiw4Yo1ZOmx8btbucw8qsLG" data-lark-html-role="root" data-docx-has-block-data="false"> <div class="ace-line ace-line old-record-id-SeyrdixubojqOkxotwguoGKpsN2"><em>Please note that Hong Kong is a group-level service hub, and </em><em>OKX</em><em> does not carry on</em><em> a business of</em><em> operating a virtual asset trading platform in Hong Kong.</em></div> </div> </div> </div> </div> </div> </div><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>