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Skills: Deep learning, Transformer architectures, PyTorch, Distributed training, Foundation models
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Other
postgraduate degree
Posted 24d ago
Apply by Aug 18
~40 hrs/week
Responsibilities
Design and implement pre-training pipelines for financial foundation models and multi-source sequence modeling. Integrate these models into downstream risk-control scenarios such as stolen-card detection and credit scoring.
Requirements
Requires a Master's degree or higher in a quantitative field and at least 3 years of deep learning R&D experience. Candidates must have hands-on experience building pre-trained models from scratch and proficiency in Transformer architectures.
Full job description
Company Overview
DiDi Global Inc. is the world’s leading mobility technology platform. It offers a wide range of app-based services across markets including Asia-Pacific, Latin America and Africa, including ride hailing, taxi hailing, chauffeur, hitch and other forms of shared mobility as well as auto solutions, food delivery, intra-city freight, and financial services.
DiDi provides car owners, drivers, and delivery partners with flexible work and income opportunities. It is committed to collaborating with policymakers, the taxi industry, the automobile industry and the communities to solve the world’s transportation, environmental and employment challenges through the use of AI technology and localized smart transportation innovations. DiDi strives to create better life experiences and greater social value, by building a safe, inclusive and sustainable transportation and local services ecosystem for cities of the future.
For more information, please visit: www.didiglobal.com/news
#LI-Hybrid
Team Overview
DiDi Fintech is deeply involved in the Latin American market, actively deploying a variety of financial services such as electronic payment, loan, credit cards, and merchant acquiring. We aim to provide local users with more convenient and high-quality services.Cost-effective financial solutions. Payment Risk Algorithm team is a core pillar of DiDi’s global Fintech business, building ML‑driven risk systems for fast‑growing Latin‑American payment and wallet scenarios. We design end‑to‑end fraud detection models to balance transaction security and user payment experience, defending against payment fraud, account compromise and emerging adversarial risks across overseas markets. You will collaborate closely with product, engineering and regional business teams to ship high‑impact algorithm capabilities that power financial expansion.
Role Responsibilities
Foundation Model Pre-training: Design and implement the pre-training pipeline for financial behavior sequence foundation models, including pre-training objective selection (CLM/MLM/Hybrid), Tokenization architecture experimentation (Flat/3D-Transformer/KVT), and scaling experiments.
Multi-source Sequence Modeling: Build a unified sequence representation for behavioral data across multiple domains (payments, ride-hailing, food delivery, credit); design and validate the impact of data-source mixing ratios on model performance. Multi-entity and Multi-scale Fusion: Design an Account-Card dual-dimension sequence modeling scheme, along with a cross-temporal-scale fusion architecture bridging micro-level behaviors (millisecond-granularity event tracking) and macro-level behaviors (day/week-level transactions).
Ablation Studies and Evaluation Framework: Build a systematic ablation experiment framework; design a freeze-backbone + linear head evaluation pipeline to drive architecture decisions.
Production Deployment: Integrate pre-trained representations into downstream risk-control scenarios (stolen-card detection, credit scoring, etc.); design a Blending Module and complete SFT fine-tuning and online deployment.
Role Qualifications
Must Have:
Master's degree or above in Computer Science, Mathematics, Statistics, or a related field.
3+ years of deep learning algorithm R&D experience, with hands-on experience building a pre-trained model from scratch and completing the full training pipeline.
Proficiency in Transformer architectures and variants (GPT/BERT/FT-Transformer/MoE), with practical sequence modeling experience.
Familiar with at least one mainstream deep learning framework (PyTorch preferred); experience with distributed training (multi-GPU / multi-node).
Solid experimental design skills: ability to independently conduct ablation studies and scaling-law experiments and draw reliable conclusions.
Strong engineering implementation skills; able to iterate efficiently on model code and training pipelines.
Nice to Have:
Modeling experience in financial risk control / anti-fraud / credit scoring.
Publications on Foundation Models / Self-Supervised Learning (NeurIPS/ICML/ICLR/KDD/WWW, etc.).
Familiarity with Contrastive Learning, ELECTRA, cross-modal fusion, and related techniques.
Experience with time-series / event-sequence modeling (e.g., TimeMixer, TrajGPT).
Experience with graph neural networks or graph-based anomaly detection.
EEO Statement
We create customer value – We strive to always create valuable experiences for our users in everything we do. Our focus is to always innovate new experiences that are safe, pleasant, and efficient.
We are data-driven – We are strong believers in making informed decisions, that’s why we are data-driven. We can better navigate the business landscape strategically by analyzing valuable metrics.
We believe in Win-win Collaboration – Success is a team sport. When we work to help our partners and colleagues win, we win, too. While keeping everyone's best interest at heart, we communicate with candor and execute with excellence in all we do.
We believe in integrity – Integrity is at the very core of our business. We are people who always want to do the right thing. Our intentions are sincere, we speak our minds and listen to each other.
We always strive to do better. That means venturing beyond our comfort zones, learning from our mistakes, and helping each other grow.
We believe in Diversity and Inclusion – Diversity is one of our biggest strengths. Our differences are what makes us distinct. We respect each other and believe in equal opportunities for all.
We are committed to building inclusive and diverse teams.
At DiDi, we believe that our differences are our biggest source of strength. That‘s why we are committed to promoting equal opportunities to all candidates and employees as an Equal Opportunity Employer.
Employment and advancement decisions at DiDi are always made based on the needs of the position and the qualifications of the candidate. We do not discriminate against any employee or applicant based on their gender, age, sexual orientation, nationality, marital status, pregnancy/maternity, disability, race, religion and beliefs, or any other status protected by applicable laws wherever we operate.
We are committed to building inclusive and diverse teams, and a workplace that is free from discrimination and harassment, because that’s how we create better products and services, make better decisions and better serve the communities we’re a part of.
I acknowledge that prior to submitting this application, I have read and accepted the Privacy Notice for Candidates which is available on https://careers.didiglobal.com/terms
DiDi Global Inc. is a leading mobility technology platform. It offers a wide range of app-based services across Asia Pacific, Latin America, and other global markets, including ride hailing, taxi hailing, designated driving, hitch and other forms of shared mobility as well as certain energy and vehicle services, food delivery, and intra-city freight services.
DiDi provides car owners, drivers, and delivery partners with flexible work and income opportunities. It is committed to collaborating with policymakers, the taxi industry, the automobile industry, and the communities to solve the world’s transportation, environmental, and employment challenges through the use of AI technology and localized smart transportation innovations. DiDi strives to create better life experiences and greater social value, by building a safe, inclusive, and sustainable transportation and local services ecosystem for cities of the future.
Offices: -, Global, CN · Av. Paseo de la Reforma, Col Juárez, Alc Cuahtemoc CP 06600, Mexico City, MX · Varsovia, Juárez, Ciudad de México, Cuauhtémoc 06600, MX · Norte, Viña del Mar, Valparaíso, CL · Level 2/7 George St, North Strathfield, Sydney, New South Wales 2137, AU