Ajay Kumar

Software Engineer

Bengaluru, Karnataka, India6 yrs 8 mos experience

Key Highlights

Expert in building scalable backend systems.
Strong experience in FinTech and distributed systems.
Proficient in multiple programming languages and cloud platforms.

Stackforce AI infers this person is a Backend Engineer with expertise in FinTech and distributed systems.

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Skills

Core Skills

JavaKubernetesJavascriptAwsC++MysqlAndroid

Other Skills

3GPPAlgorithmsAmazon DynamodbAmazon S3Amazon Web Services (AWS)CC (Programming Language)CassandraComputer NetworkingData StructuresDatabase Management System (DBMS)ElasticsearchGenetic AlgorithmsGenetic ProgrammingGit

About

Backend Engineer | Distributed Systems | Java · Go · Python I build and scale backend systems used by millions of users, with a focus on performance, reliability, and security. I’ve worked across domains such as FinTech, Hyperlocal, Ride-sharing, Telecommunication and Order Platforms, designing and operating systems using Java, Python, Go, JavaScript, Kotlin and C++ on AWS and GCP. My data stack includes DynamoDB, MySQL, Cassandra, MongoDB, and ElasticSearch. I’ve used Redis and Kafka to power high-throughput, low-latency systems, while ensuring data safety, security, and compliance requirements like SCA and 3DS. Beyond individual contributions, I collaborate closely with product, frontend, data, and infra teams to drive technical initiatives end-to-end—from architecture and execution to production rollout and operational ownership. My experience spans scaling distributed systems, and migrating monoliths to microservices, with hands-on ownership of production systems and operational challenges. Always happy to talk about backend engineering, system design, and scalability trade-offs—feel free to reach out.

Experience

Booking.com

Software Engineer - 2

Mar 2023 – Jul 2025 · 2 yrs 4 mos · Amsterdam, North Holland, Netherlands · Hybrid

Part of the Booking.com - FinTech where we build products to help our Partners (Hotels, Small Properties etc) manage their Payments.

KubernetesKafkaMySQLPerlKotlinJava+2

Rapido

Senior Software Engineer

Sep 2022 – Feb 2023 · 5 mos · Bangalore Urban, Karnataka, India · Hybrid

Was part of the pricing team

nodejsJavaScriptkafkaRedisMongoDBJava+3

Amazon

Software Development Engineer - II

Jun 2022 – Sep 2022 · 3 mos · Bengaluru, Karnataka, India · Hybrid

Part of the Payment-Platform-Team where we build products to help other LOBs in Amazon (AWS, Amazon Retail, Digital Products, Kindle, Amazon Fresh, Amazon Prime, Amazon Pharmacy etc; there were so many of them) move faster by providing them the Payment solutions out of the box which work in almost every country and allow them scale their products/business-line without worrying about reliability, scalability, security, Regional compliance (SCA, RBI guidelines etc)

JavaAmazon DynamodbspringAmazon Web Services (AWS)AWS

Swiggy

2 roles

Senior Software Engineer

Oct 2021 – Feb 2022 · 4 mos

Redesigned & implemented User & Outlet Management self-serve feature for Swiggy Partner (Android) & Owner (iOS) application which helps the Restaurant Partners manage their employees, roles/permissions, outlet & communication information.
Designed and implemented IVRS (Automated) Call & OTP flow for landline users allowing them to register on the platform with the landline number.
Redesigned the login flow for Multi-City Mutli-outlet restaurants, refactored the login API which improved the performance (P99) of the API from ~5s to ~300ms.

Software Development Engineer

Dec 2020 – Oct 2021 · 10 mos

Revamped homepage for Swiggy Partner (Android) & Owner (iOS) application & built a Content Management System that helps in publishing/scheduling content & widgets without requiring app release on Play/App store.
Built the Near Real Time (NRT) Customer Metrics funnel to help Swiggy Restaurant Partners get insights of the order conversion hit from menu visits and see new/repeat users on the platform, menu and cart sessions in real-time on the homepage.
Designed & implemented a daily scheduled backfill job which helps to fix the correctness of the Order Metrics funnel data.

Spring BootMySQLNode.jsGraphQLRedisAmazon Web Services (AWS)+5

Samsung electronics

Software Development Engineer

Jun 2018 – Dec 2020 · 2 yrs 6 mos · Noida, Uttar Pradesh, India

Built the feature where users can unlock their devices remotely which are network-locked.
Refactored the RIL (Radio Interface Layer) code to parallelise the requests for diff. MODEMs (exynos, QCOM, MediaTek etc)
Built the in-house Cache on RIL layer to improve the performance of flagship & non-flagship devices.
Handled issues related to the RIL-SIM and Telephony Framework.
Migrated the Telephony & RIL code from Android O to Android P and then Android P to Android Q.

JavaC++AndroidTelephony frameworkRIL(Radio Interface Layer)3GPP