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Aankit Singh

SDE II @ HashedIn By Deloitte | Ex - Pine Labs | 5+ YOE | Building High-Concurrency, Low-Latency Distributed Systems @ Citi Bank | Java, Spring Boot, Spring Webflux, Elasticsearch, Kafka, Redis, AWS

Gurugram

5+ years of work experience

HashedIn by Deloitte
Jun 20242 yrs 3 mosPresent

Hybrid

Worked with Citi Bank • Developed a robust ACK/NACK mechanism within microservices powering trading settlement services at a Citi Bank, ensuring 99.9% message reliability and 60% faster failure recovery across millions of daily transactions. • Implemented custom retry logic and dead-letter queue handling in Kafka consumer services using manual offset commits, and exponential backoff strategy, reducing message loss by 95% and improving system resilience by 40% during failure scenarios. • Designed and implemented a robust republish mechanism for failed trades, ensuring end-to-end reliability and achieving 100% data consistency across downstream systems. • Built a high-throughput transaction pipeline by integrating Kafka with Elasticsearch, processing 1M+ daily events and enabling real-time analytics and UI access. • Developed an IntelliJ AI Assist Plugin leveraging embeddings, GenAI, and RAG models to power smart editing, automated test generation, and intelligent code suggestions, reducing developer effort by 70%. • Led a team of engineers to improve code quality and productivity by 25%, and conducted thorough PR reviews with constructive feedback to maintain high engineering standards.
Pine Labs
Jul 20222 yrsJun 2024

Noida, Uttar Pradesh, India

• Structured the Object Oriented Low-Level Design (LLD) and High-Level Design (HLD) phases for seamless API integration, ensuring optimal functionality and performance for the variable frequency support on subscription-model services. • Engaged as a core team member and played a central role in the development and enhancement of UPI services and Card Gateway Services within the merchant platform. • Collaborately developed a Fee Module Service for products used by merchants from the scratch with the team of 3 members. • Implemented an Email Service to enhance communication and monitoring for daily payment transaction success rates. • Developed and maintained highly efficient asynchronous REST APIs using Project Reactor and Spring Webflux, optimizing performance during periods of high traffic. • Created entire API structures, alongside layer-specific and functional test cases, maintaining code coverage of over 95%. • Collaborated closely with architects and team leads to design database schemas and data models tailored to meet application requirements. • Proficiently contributed to a diverse range of projects following agile methodologies sprint cycles and Jira Task Management within the fintech domain.
Cognizant
Jan 20227 mosJul 2022

Gurugram, Haryana, India

• Designed and developed a complex system comprising five microservices, incorporating essential features such as API gateway, central configuration utilizing Config Server, circuit breaker, global filters, dynamic scaling via Feign and Eureka Naming Server, and integrated monitoring with Zipkin. Additionally, implemented fault tolerance using Resilience4j.. • Orchestrated the integration of multiple microservices into multi-container docker application using Docker Compose. • Demonstrated commitment to code quality by diligently crafting test cases for the application, employing Mockito and JUnit testing frameworks. • Successfully completed a project following Agile methodology, collaborating with a team to meet all business requirements and deliver on schedule.
Team Computers
Jul 20216 mosDec 2021

Gurugram, Haryana, India

• Proficiently managed client interactions, serving as a primary point of contact for their user experience. Effectively addressed and resolved business queries, while also implementing necessary modifications to web pages and dashboards. • Collaborated within a team to successfully execute a project involving the design and implementation of a production dashboard layout for data analytics purposes at Boston Consulting Group (BCG) and Panasonic Holdings Corporation. Leveraged SpringBoot, HTML, CSS, JavaScript, and Qlik API to bring this dashboard to life, facilitating insightful data visualization and analysis which further helps in their decision making processes.
Team Computers
Apr 20213 mosJun 2021

Gurugram, Haryana, India

• Trained on the Qlik Services which includes QlikSense, Nprinting & QMC • Worked on 3 Demo Projects from the scratch. • Performed the best practices, did ETL , prepared the data models and a dashboard which includes KPI, Gauge charts, Bar graphs, line-charts, etc.
GitHub
@annkit-singh

Aankit’s AI Stack

claude
claude
cursor
cursor
langgraph
langgraph
langsmith
langsmith
opencode
opencode
claudecode
claudecode

Education

kanpur institute of technology

Bachelor of Technology, Electronics and Communication Engineering

kanpur institute of technology

20174 yrs2021

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Headline

SDE II @ HashedIn By Deloitte | Ex - Pine Labs | 5+ YOE | Building High-Concurrency, Low-Latency Distributed Systems @ Citi Bank | Java, Spring Boot, Spring Webflux, Elasticsearch, Kafka, Redis, AWS

About

Backend Engineer with 5+ years building high-scale distributed systems at HashedIn by Deloitte and Pine Labs. Currently engineering trading settlement microservices for Citi Bank, processing 10M+ daily transactions with 99.9% reliability. Specialized in event-driven architectures, microservices at scale, and reactive systems. > Built systems handling 99.9% uptime, 10M+ daily transactions > Expert in Java, Spring Boot, Kafka, distributed systems > Solved complex problems in fintech and payment platforms > AI enabled, Top performer, 4-star CodeChef competitive programmer Actively exploring SDE II/III opportunities in product-focused companies . Open to Bangalore, Noida, Pune, Gurugram, Remote, or relocation.

Location

Gurugram

AI stack

claude

cursor

langgraph

langsmith

opencode

claudecode

Work experience

SDE 2 at HashedIn by Deloitte, Jun 2024 - Present · 2 yrs 3 mos, Hybrid, Worked with Citi Bank • Developed a robust ACK/NACK mechanism within microservices powering trading settlement services at a Citi Bank, ensuring 99.9% message reliability and 60% faster failure recovery across millions of daily transactions. • Implemented custom retry logic and dead-letter queue handling in Kafka consumer services using manual offset commits, and exponential backoff strategy, reducing message loss by 95% and improving system resilience by 40% during failure scenarios. • Designed and implemented a robust republish mechanism for failed trades, ensuring end-to-end reliability and achieving 100% data consistency across downstream systems. • Built a high-throughput transaction pipeline by integrating Kafka with Elasticsearch, processing 1M+ daily events and enabling real-time analytics and UI access. • Developed an IntelliJ AI Assist Plugin leveraging embeddings, GenAI, and RAG models to power smart editing, automated test generation, and intelligent code suggestions, reducing developer effort by 70%. • Led a team of engineers to improve code quality and productivity by 25%, and conducted thorough PR reviews with constructive feedback to maintain high engineering standards.

Software Engineer at Pine Labs, Jul 2022 - Jun 2024 · 2 yrs, Noida, Uttar Pradesh, India, • Structured the Object Oriented Low-Level Design (LLD) and High-Level Design (HLD) phases for seamless API integration, ensuring optimal functionality and performance for the variable frequency support on subscription-model services. • Engaged as a core team member and played a central role in the development and enhancement of UPI services and Card Gateway Services within the merchant platform. • Collaborately developed a Fee Module Service for products used by merchants from the scratch with the team of 3 members. • Implemented an Email Service to enhance communication and monitoring for daily payment transaction success rates. • Developed and maintained highly efficient asynchronous REST APIs using Project Reactor and Spring Webflux, optimizing performance during periods of high traffic. • Created entire API structures, alongside layer-specific and functional test cases, maintaining code coverage of over 95%. • Collaborated closely with architects and team leads to design database schemas and data models tailored to meet application requirements. • Proficiently contributed to a diverse range of projects following agile methodologies sprint cycles and Jira Task Management within the fintech domain.

Programmer Analyst Trainee at Cognizant, Jan 2022 - Jul 2022 · 7 mos, Gurugram, Haryana, India, • Designed and developed a complex system comprising five microservices, incorporating essential features such as API gateway, central configuration utilizing Config Server, circuit breaker, global filters, dynamic scaling via Feign and Eureka Naming Server, and integrated monitoring with Zipkin. Additionally, implemented fault tolerance using Resilience4j.. • Orchestrated the integration of multiple microservices into multi-container docker application using Docker Compose. • Demonstrated commitment to code quality by diligently crafting test cases for the application, employing Mockito and JUnit testing frameworks. • Successfully completed a project following Agile methodology, collaborating with a team to meet all business requirements and deliver on schedule.

Developer at Team Computers, Jul 2021 - Dec 2021 · 6 mos, Gurugram, Haryana, India, • Proficiently managed client interactions, serving as a primary point of contact for their user experience. Effectively addressed and resolved business queries, while also implementing necessary modifications to web pages and dashboards. • Collaborated within a team to successfully execute a project involving the design and implementation of a production dashboard layout for data analytics purposes at Boston Consulting Group (BCG) and Panasonic Holdings Corporation. Leveraged SpringBoot, HTML, CSS, JavaScript, and Qlik API to bring this dashboard to life, facilitating insightful data visualization and analysis which further helps in their decision making processes.

Trainee at Team Computers, Apr 2021 - Jun 2021 · 3 mos, Gurugram, Haryana, India, • Trained on the Qlik Services which includes QlikSense, Nprinting & QMC • Worked on 3 Demo Projects from the scratch. • Performed the best practices, did ETL , prepared the data models and a dashboard which includes KPI, Gauge charts, Bar graphs, line-charts, etc.

Education

Bachelor of Technology, Electronics and Communication Engineering, kanpur institute of technology

Public links

github: https://github.com/annkit-singh