Rajarshi Sengupta

Full Stack Engineer

Bengaluru, Karnataka, India2 yrs 11 mos experience

Highly Stable

Key Highlights

Led a team to deliver a B2B application.
Reduced processing latency from 1 minute to sub-800ms.
Scaled data ingestion pipelines for burst traffic.

Stackforce AI infers this person is a Backend-heavy Fullstack Engineer in the SaaS industry.

Contact

rajarshisengupta50@gmail.com LinkedIn

Skills

Core Skills

Node.jsReact.jsAws SqsAws LambdaKinesisAws CdkCloudformationTypescriptMongodbSqs

Other Skills

DynamoDBLambdaPythonCI/CDReactData Structures and AlgorithmsJavaScriptApache KafkaSystems DesignRedux.jsMicroservicesDistributed SystemsContinuous Integration and Continuous Delivery (CI/CD)Amazon Web Services (AWS)Amazon CloudFront

About

Software engineer with a track record of building applications and distributed systems from the ground up and scaling them with a strong focus on availability and fault tolerance. Shipped event-driven pipelines processing 100K+ events per day, microservices handling 30K+ events per burst, systems syncing GBs of data daily from external sources, and core features of a commercially deployed IoT analytics platform serving 30+ enterprise B2B customers — handling 10K+ daily API requests at sub-350ms p95 latency, and serving real-time data from a 1 TB data lake. Experienced in leading teams of 2-3 engineers to architect and deliver solutions tied to business outcomes within tight deadlines. Beyond writing code, I care deeply about being aligned with business goals, making the right architectural calls early, keeping systems observable in production, and not over-engineering things that don't need it. Stack: Node.js • TypeScript • Python • React • AWS (Lambda, SQS, Kinesis, DynamoDB, CDK, CloudFormation) • Redis • MongoDB • Docker Actively seeking Backend or Full-Stack Engineer roles at product-first teams where distributed systems and technical depth matter. Feel free to reach out — rajarshisengupta50@gmail.com

Experience

2 yrs 11 mos

Total Experience

2 yrs 11 mos

Average Tenure

2 yrs 11 mos

Current Experience

Bp

2 roles

Software Engineer - II

Promoted

Sep 2025 – Present · 9 mos · Pune District · Hybrid

Leading a 3-engineer team to deliver a B2B customer lifecycle application (React + RTK, Node.js/Express on Lambda) with role-based approval workflows, S3 presigned URL-based document sharing, and a SQS + SES notification service for event-driven email alerts at every workflow transition.
Re-architected a notifications pipeline by replacing a Kinesis streaming solution with an SQS–Lambda event-driven path and moving state storage from S3 CSV snapshots to DynamoDB, reducing processing latency from ~1 minute to sub-800ms and saving $12K annually.
Modelled an enterprise SQL-based marine dataset (millions of rows) into DynamoDB with hierarchical GSIs (customer → vessel → asset) to serve a step-by-step typeahead search on React frontend, with debounced queries and sub-3s response times.
Scaled data ingestion pipelines for burst traffic by introducing a Lambda-based batching layer between Kinesis SQL and downstream services, implementing idempotent batching, application-level backpressure, and DLQ retries, enabling reliable processing of 30K+ events per burst.
Built a self-service infrastructure provisioning platform (React, Node.js APIs, Python workers) that automates infrastructure (IoT Core assets, certificates, SiteWise hierarchy, DynamoDB records) provisioning for new customer accounts, reducing onboarding time from days to minutes and enabling 50+ B2B deployments.

Node.jsReact.jsDynamoDBSQSLambda

Software Engineer

Jul 2023 – Sep 2025 · 2 yrs 2 mos · Pune District · Hybrid

Contributed to the development of the web application for a commerically deployed IoT analytics platform serving 30+ B2B customers, implementing RBAC authentication, 15+ APIs (Node.js) with DynamoDB, and analytics dashboards React, Redux Toolkit, Chart.js), supporting 10K+ daily API requests at sub-350ms p95 latency.
Migrated platform infrastructure from CloudFormation to AWS CDK, consolidating 100+ production stacks into 10 modular stacks, and established CI/CD pipelines with automated testing and PR validation.
Migrated notification delivery from Amazon SNS to SES and built a subscription management system with DynamoDB and backend APIs for user opt-in/opt-out preferences, supporting 300+ subscribed users and delivering 1.5K+ notification emails/month.
Consolidated 3 React.js/Express.js repositories into a Turborepo monorepo, introducing shared infrastructure and UI packages to reduce code duplication, and built a CloudFormation deployment framework to standardize provisioning of new React + Node.js applications (CloudFront, S3, Lambda, Route53).

Node.jsReact.jsDynamoDBAWS CDKCI/CD

Zluri

Software Engineer Intern

Nov 2021 – May 2023 · 1 yr 6 mos · Bengaluru · Remote

Projects:
Integrations – A core microservice in Zluri’s architecture, integrating with 800+ third-party SaaS applications to fetch user, activity, and cost-related data for organizations. Runs daily, syncing gigabytes of data between applications and Zluri’s dashboard.
Workflows – The automation engine powering Zluri’s employee onboarding/offboarding feature. Supports 2000+ actions, each performing a specific step in provisioning or deprovisioning users across SaaS applications.
Roles & Responsibilities:
Back-end developer for the Integrations and Workflows microservices, playing a key role in the initial development of the workflows engine and later serving as its subject matter expert (SME).
Key Contributions:
Developed and managed several critical APIs for the Workflows microservice using TypeScript and MongoDB, enabling 100+ daily workflow runs.
Scaled the workflow engine from handling 50+ to 1000+ concurrent runs using SQS and Lambda, significantly improving system throughput.
Built cron-based monitoring scripts for 100+ daily workflow runs and 1000+ actions, reducing manual monitoring efforts.
Engineered a no-code platform with React for workflow action development, reducing build time from days to hours, accelerating project timelines, and boosting team productivity.
Recognized for performance and received a full-time Software Engineer offer in the Integration Engineering team.

TypeScriptMongoDBSQSReact

Coding ninjas

Teaching Assistant - Web Development

Oct 2021 – Nov 2021 · 1 mo · New Delhi · Remote

Responsible for solving doubts & evaluating projects for the Web Development course.
Resolved 170+ doubts with an average student rating of 4.91 / 5.00.