Engineer Jobs in Web3

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 We're looking for a Senior/Lead Algorithm Engineer to build our overseas growth algorithm capabilities from the ground up. You'll design and implement end-to-end ML systems that optimize paid advertising (Google, Meta), intelligent user targeting, and LTV prediction across 100+ countries and millions of users. This is a high-impact role with significant ownership - you'll define the technical direction, build scalable systems, and directly influence how OKX acquires and retains high-value users globally. As the area matures, you'll have the opportunity to scale the team and grow into Staff Engineer or Engineering Manager roles. What You'll Build Paid Ads Optimization

Design intelligent bidding algorithms for Google Ads, Meta Ads, and other paid channels to optimize CPA, ROAS, and user quality

Build automated budget allocation systems across campaigns, geos, and channels based on real-time performance and predicted LTV

Develop creative performance prediction models to guide A/B testing

Implement multi-touch attribution models to accurately measure channel contribution

User Targeting & Selection

Build lookalike modeling and audience expansion algorithms to identify high-value user segments

Design propensity models for conversion prediction at different funnel stages (registration, KYC, deposit, first trade)

Develop real-time user scoring systems to optimize bid adjustments and personalized experiences

Create behavioral clustering models to identify user personas and refine targeting strategies

LTV Prediction & Retention

Build LTV prediction models incorporating user behavior, market conditions, and engagement patterns

Develop early signals detection to identify high-LTV users within 24-72 hours

Design churn prediction and reactivation models to optimize retention campaigns

Implement cohort analysis to track performance across channels and time periods

Requirements

3+ years of hands-on experience in growth algorithms, performance marketing, or user acquisition optimization

Strong expertise in ML frameworks: PyTorch, TensorFlow, XGBoost, LightGBM

Proficiency in Python and SQL; experience with big data processing (Spark, Flink, or similar)

Demonstrated ability to work independently and drive 0→1 projects

Strong communication skills in English; Chinese proficiency is a plus

Preferred

Background in fintech, cryptocurrency, or high-growth tech companies

Knowledge of blockchain technology and crypto user behavior

Experience with deep learning for sequence modeling and user behavior prediction

What We Offer Impact & Growth

High ownership role with autonomy to build and define technical direction

Direct impact on OKX's global growth (millions in marketing spend optimization)

Opportunity to scale the team and hire as the platform grows

Work on cutting-edge ML problems at massive scale

Location Details

China (Remote): Work remotely from major cities with occasional travel to HK/SG for collaboration

Hong Kong: Office-based

Singapore: Office-based

  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 allowances 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.

LI-DY #LI-ONSITE

Notice: All official OKX vacancies are published on this website. While roles may appear on selected third-party platforms from time to time, information on other sites may be inaccurate or outdated. If in doubt, please apply directly through our official careers website.

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