Full-timeTech & engineering· Posted 31 Aug

Senior Principal Data Scientist (Fulfilment)

GrabFrom company site

Salary

Not stated by the company

When

Full-time hours

Where

CCone-north

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Start: Not stated
Work mode: On-site
Experience: Experienced

About the role

You will join the Fulfilment Tech Family, the group behind the real-time distributed systems and machine learning that power Grab's marketplaces across Southeast Asia. This is a senior principal individual contributor position focused on moving the marketplace toward automated optimisation, working where reinforcement learning, large language models and large-scale production systems meet. It suits a deeply technical data scientist who can set research direction while also shipping models into live environments.

What you'll do

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Design and build end-to-end reinforcement learning pipelines that bring together model-based RL, offline RL, simulation and online learning, including state representations and reward structures that trade off short-term and long-term outcomes.

Develop latent world models and marketplace state representations that capture supply-demand interactions, location-based patterns and behavioural signals from users and driver-partners.

Build systems that optimise several marketplace levers at once, such as pricing, dispatching and supply repositioning, to widen the range of achievable business outcomes.

Create policy evaluation frameworks and monitoring systems so new decision-making policies can be deployed safely in production.

Fine-tune open-source large language models on domain-specific data for prediction, reasoning and simulation in marketplace applications.

Design training strategies for language models, covering supervised fine-tuning, preference-based alignment and iterative improvement methods.

Partner with data engineers and backend engineers to integrate RL and LLM systems into real-time production environments serving millions of users.

Act as technical lead for a small team, guiding both research direction and production implementation.

Good to know

You will report to the Head of Data Science.
The role is based at Grab's One-North Singapore office.
FlexWork arrangements are available, including differentiated hours.
Benefits include term life insurance, comprehensive medical insurance, GrabFlex, parental and birthday leave, LASA volunteering leave and the Grabber Assistance Programme.

Requirements

PhD in Computer Science, Operations Research, Applied Mathematics or a related field
At least 10 years of experience leading complex technical initiatives across research and production systems
Strong grounding in RL fundamentals such as Markov Decision Processes, stochastic control and reward design trade-offs
Experience building production ML or RL systems with online learning or simulation-based optimisation
Knowledge of world models and sequential modelling, including latent dynamic models (RNNs, transformers, state-space models) and representation learning
Hands-on experience fine-tuning large language models in production, including supervised fine-tuning and at least one preference-based alignment method (RLHF, DPO or GRPO)

Benefits

Term life insurance
Comprehensive medical insurance
GrabFlex flexible benefits package
Parental leave
Birthday leave
Love-all-Serve-all (LASA) volunteering leave

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Senior Principal Data Scientist (Fulfilment)

About the role

What you'll do

Good to know

Requirements

Benefits

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