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<developer/>

Abhay Raj Singh.

/ʌbʰj raːdʒ sɪŋh/

An engineer who loves to build things. Specializing in backend engineering, and aiming for proficiency in all-stack, a fancy way to say everything engineering.

Timeline.

/ˈtaɪmlaɪn/
    PayPay India
    Backend Engineer L2
    May 2025 - Present (7 months)

    Building scalable systems and leading a high-impact lean and mean team at scale.


    • Backend Development: Rapidly scaled to ownership of event-driven services handling 100M+ daily deliveries using Domain-Driven Design for rapidly evolving flexible system. Collaborated cross-functionally with other teams to architect resilient, high-performance systems from just day 60 of joining the company.

    • Leadership: Module lead for the promotional notifications team, the architects behind every campaign. Stewarding both greenfield services and legacy systems while mentoring engineers and driving technical decisions that directly impact users and marketing teams experience.

    Tealfeed
    Software Engineer 2
    September 2021 - April 2025 (3 years 9 months)

    Designing distributed systems, architecting microservices, and managing end-to-end infrastructure on AWS with Kubernetes and Terraform.


    • Backend Development: From building complex payment gateways and SSO systems to architecting ABAC-based access management, I love solving hard backend problems using Go, Node.js, NestJS, PostgreSQL, MongoDB, Redis, RabbitMQ, and Kafka.

    • DevOps & Infra: I lead and maintain production-grade DevOps pipelines, working with AWS, Kubernetes, CI/CD, GitOps, Docker, and Terraform, ensuring high availability and compliance with ISO 27001:2022, HIPAA, and SOC2 standards.

    • Leadership & Mentorship: As a founding backend engineer, I’ve led migrations from monolith to microservices, mentored junior engineers, and driven key architectural decisions that reduced system latency by 92% (3000ms to 240ms).

    Google Summer of Code
    Software Engineer Intern
    May 2020 - July 2020 (3 months)

    Worked on the open source graphics app: Inkscape. Initially thought it to primarily feature project but ended up being an architectural problem

    Learning programming
    Self Learner
    July 2015 - Present (10 years 7 months)

    I delved into the enchanting world of programming, with C++ as my weapon of choice – a decision that proved to be the catalyst for my epic coding journey.