Sartaj Singh

• Aligned organizational objectives to build a path to Principal Engineering at Neo.
• Responsible for the payments, credit and banking experience pillars at the company

Helped the leadership (CEO, COO) build frontend and backend team and tech from scratch at GFP (https://greenfutureproject.com). Acted as the interim CTO and then later hired a fulltime CTO for them.

Green Future Project (GFP) is a climate-tech start-up on a mission to connect businesses & individuals to finance the world's most impactful climate solutions.

Gojek (GoTo) amounted to 2.2% of Indonesia's GDP in 2022. I have been a part of the Gojek's (GoTo) Executive Engineering leadership team since 2017 while it achieved unicorn and decacorn status and then IPOed in 2022.

I led Engineering platforms for Gojek and was a part of the CTO staff. Responsible to standardise and automate our cloud, engineering and data infrastructure in order to achieve a cost efficient and developer productive ecosystem for software development in the organization which was scalable without the need for rewrites.

• Led the Engineering team through IPO while standardizing and regulating engineering principles for compliance
• Handled more than 800 microservices and 50 clusters while streamlining deployments, networking, observability and SRE in our organization
• Team constituted of 150 engineers with 6 direct reports spread across south east Asia.
• Managed our event driven architecture that did 700k req per second

Led a group of 40+ engineers including 4 engineering managers in Singapore, India and Indonesia, responsible for:

Matching Drivers and Customers

• Balancing driver supply with customer demand spread across multiple products like food, transport and geographies
• Tracking location of over one million drivers at any point of time and filter out drivers available to take new order.
• Applying algorithms to find best match, considering various dynamic and static parameters of both customers and drivers.

Incentivize Drivers to be on platform

• Building machine learning models to optimize driver incentives and maximise trips within constraints

Customer and Driver Pricing

• Provide right price for each booking to balance demand and supply
• Calculation of Surge Pricing according to Demand Supply dynamics.

My Responsibilities:
• Overall Stability of the System
• Designing System Architecture.
• Delivery
• Recruitment and Growing the team

Technologies/Tools Used:
Clojure, Golang, Java, VueJS, Ruby On Rails, Postgresql, Kafka, Redis, Rabbitmq, Haproxy, Chef, Ansible, Kubernetes, GCP

Responsible for maintaining and enhancing the platform that does customer <> driver matching, tracking locations of over 1 million drivers, finding the optimum price and surge for every Gojek order

Worked on the following projects:

• Route/ETA based Allocation of drivers to customers
• Batched Allocation to gain global optimization in marketplace
• Moved driver location tracking platform to event driven architecture handling over 20k requests per second
• Enhanced allocation, pricing platform for multi country deployments
• Enhanced driver notification system from backend to improve reliability

Technologies Used:

Golang, Java, Clojure, Postgresql, Kafka, Redis, Chef, Ansible, GCP

Allocations team was responsible for driver <> customer matching, dispatch and driver rewards system.

As a part of the team I worked on and delivered the following:

• Rewrote entire driver allocation engine from Golang to Clojure
• Built and deployed driver statistics platform from scratch
• Introduced postgres table level partitioning in the company
• Built and deployed driver preferences system
• Integrated Gojek's first Data Science model on driver ranking with the allocations platform
• Built and deployed Route based allocation architecture

Technologies/Tools used:

• Clojure, Golang, Java, Chef, Ansible, Jenkins, Postgresql, Rabbitmq, Redis, GCP

Go-send is a logistics delivery product with same day and instant delivery capabilities

I was a part of the team with following responsibilities:

• Build and deploy the product from scratch
• Scale the delivery system by 10X

Technologies used:

Ruby On Rails, Sidekiq, GCP, Postgresql, Redis

• Worked on automating deployment and configuring CI/CD pipelines for multiple services

• Developed a web application for an online education platform

Technologies Used:
Ruby On Rails, Chef, Jenkins, PostgreSQL, MongoDB, Javascript, AWS