Senior Staff Algorithm Engineer, Recommendation

P2P; Makkah Region; On-site; SAR 250,000 - 420,000; Full time

Benefits offered by this job

Competitive total compensation package

L&D programs and education subsidy

Team building programs

Wellness and meal allowance

Comprehensive healthcare schemes

Job summary

A leading crypto exchange is looking for a seasoned expert to own the technical direction of its next-generation recommendation system. This role will significantly impact user engagement and trading conversions, requiring deep experience in sponsored content systems, user intent profiling, and extensive engineering skills. The ideal candidate will have a Master's in CS or Math, 8+ years in the industry, and proven success in high-scale implementations. Competitive compensation and extensive employee benefits are offered.

Qualifications

• 8+ years of experience, 5+ in core recommendation/search roles.
• Track record of end-to-end recommendation pipelines at 10M+ DAU.
• Hands-on experience with user profile systems.
• Experience designing unified intent representations across heterogeneous domains (content / feature / search).
• Hands‑on experience with tiered user profile systems (cold‑start → interest exploration → stable preference).
• Deep understanding of Attention mechanisms in sequential behavior modeling.
• Proficiency in Listwise losses (ListMLE / Softmax Loss) and joint multi‑candidate ranking.
• Expert‑level knowledge of MMoE / PLE / ESMM and gradient conflict mitigation.
• Ability to design composite loss functions bridging offline metrics and online KPIs.
• Hands‑on uplift modeling and bias/ calibration techniques.

Responsibilities

• Drive ranking model iteration for user retention and trading conversion.
• Build a cross-domain intent framework for user actions.
• Chart a 12–24 month evolution from Transformer-based ranking.
• Pioneer the Agent Paradigm — integrate recommendation and search into an LLM Agent framework for proactive intent fulfillment.

Skills

User Intent & Profiling

Transformer & Ranking

Multi-Task Training

Business Attribution

Generative Recommendation

Recommendation & Search Agent

Engineering

Education

Master's or above in CS / Math from a top university

Tools

Flink

Kafka

LLM Agent frameworks

Job description

Who We Are

At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom.

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.

Across our multiple offices globally, we are united by our core principles: We Before Me, Do the Right Thing, and Get Things Done. These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er.

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.

About the Role

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.

Responsibilities

• Elevate the Ranking System — Drive continuous ranking model iteration with measurable impact on user retention and trading conversion
• Unify User Understanding — 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"
• Define the Technical Roadmap — Chart and execute a 12–24 month evolution from Transformer-based ranking toward generative recommendation (sequence generation + preference alignment)
• Pioneer the Agent Paradigm — Integrate recommendation and search capabilities into an LLM Agent framework, enabling proactive intent fulfillment rather than passive content delivery

Requirements

• Background — 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
• User Intent & Profiling (Core) — 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)
• Transformer & Ranking (Core) — 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
• Multi-Task Training (Core) — 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
• Business Attribution (Core) — Hands‑on Uplift Modeling experience; proficiency in Position / Selection Bias correction and prediction probability Calibration
• Generative Recommendation (Strong Plus) — Understanding of Semantic Tokenization (FSQ / RQ‑VAE) and conditional sequence generation; working‑level knowledge of RLHF / DPO applied to recommendation systems
• Recommendation & Search Agent (Strong Plus) — 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
• Engineering — Large‑scale distributed training (10B+ parameter models); real‑time feature engineering (Flink / Kafka); inference optimization under strict latency SLA

Bonus

First‑author publication at RecSys / KDD / WWW ｜ Bandit / RL production deployment ｜ Background in fintech / crypto

Perks & Benefits

• Competitive total compensation package
• L&D programs and education subsidy for employees' growth and development
• Various team building programs and company events
• Wellness and meal allowance
• Comprehensive healthcare schemes for employees and dependants
• More that we love to tell you along the process!

Please note that Hong Kong is a group-level service hub, and OKX does not carry on a business of operating a virtual asset trading platform in Hong Kong.