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Priyanshu Sekhar
Verified Expert in Engineering
Software Developer
Bengaluru, Karnataka, India
Toptal member since May 5, 2021
Bio
Priyanshu is a seasoned software engineer with 9+ years of experience working over several full-stack platforms built upon cloud and serverless infrastructures. He has strong experience in Java, JavaScript, Python, AWS, React, React Native, and Flutter. Over the years, Priyanshu has led and driven multiple projects in domains ranging from payments and knowledge graphs to apps based on real-time collaboration, productivity, work management platforms, and, most recently, legal operations.
Portfolio
TP ICAP
Java 8, Spring Boot, Apache Kafka, Flink, Amazon ElastiCache, Amazon EKS...
LokamHealth
AWS Lambda, Redis, WhatsApp API, WhatsApp Business, FastAPI, Next.js...
Revolutio
Flutter, AWS IAM, Amazon DynamoDB, AWS Lambda, Amazon Bedrock, Amazon Cognito...
Experience
- Java - 7 years
- React - 7 years
- REST APIs - 7 years
- React Native - 5 years
- Firebase - 3 years
- Flutter - 3 years
- Go - 2 years
Preferred Environment
Flutter, Java, Python, Amazon Web Services (AWS), React, JavaScript
The most amazing...
...platform I've developed was for Revolutio.ai. I designed and built the platform from scratch to live, onboarding 15 high-volume clients with minimal ops issues.
Work Experience
Senior Software Consultant
2025 - PRESENT
TP ICAP
- Architected and built an enterprise-grade streaming platform delivering real-time oil/energy trade data to institutional clients via WebSocket, processing roughly a million trades/second with sub-sec latency using Apache Flink, MSK, and API Gateway.
- Designed an Apache Flink application on AWS Kinesis Data Analytics consuming cross-account MSK topics from Data Warehouse, implementing 5-minute tumbling window aggregations with exactly-once semantics and checkpoint-based recovery.
- Built Spring Boot microservices on EKS, managing WebSocket connections with Okta JWT authentication, per-client Kafka topic routing, and dynamic filtering, supporting 100+ concurrent external clients with client-specific entitlements.
- Provisioned complete AWS infrastructure using Terraform, including MSK clusters with IAM authentication, EKS deployments with Helm, API Gateway WebSocket APIs, Lambda authorizers, cross-account IAM roles, and DynamoDB.
- Built scheduled ETL pipeline processing 100K+ daily market records cached in Redis (fed by MSK) into client-specific CSV snapshots, delivering to S3 and SMB shares with CRC32 validation, Snowflake audit logging, and fault-tolerant recovery mechanism.
Technologies: Java 8, Spring Boot, Apache Kafka, Flink, Amazon ElastiCache, Amazon EKS, Amazon DynamoDB, DocumentDB, AWS Lambda, Amazon S3 (AWS S3), AWS Key Management Service (KMS), Java, Spring, APIs
Head of Engineering
2024 - 2025
LokamHealth
- Architected a healthcare platform (FastAPI, Next.js, React Native, Flutter) serving 10,000+ users across 50+ pharmacies with order tracking, prescription validation, inventory with expiry management, and Zoho Books integration.
- Built supplier invoice OCR using OpenAI Vision, achieving 98% accuracy, extracting medicine names, batches, and expiry dates with vector matching, reducing reconciliation time 65% across warehouses.
- Developed a WhatsApp notification engine with WATI templates processing 5,000+ daily messages for order alerts, delivery updates, and reminders, reducing support tickets by 40%.
- Designed task management with GPS verification and photo uploads for rack optimization, leave tracking, and employee monitoring via Lambda/EventBridge—87% cost reduction vs. polling.
- Created PWA and React Native apps for self-ordering with AI-powered generic medicine recommendations using OpenAI embeddings, cart management, and real-time tracking via SSE.
Technologies: AWS Lambda, Redis, WhatsApp API, WhatsApp Business, FastAPI, Next.js, AWS App Runner, Amazon S3 (AWS S3), Amazon CloudFront, Front-end, Terraform, Terraform Cloud, CI/CD Pipelines, Event-driven Architecture, RESTFul APIs, Amazon EC2, Amazon EKS, Infrastructure as Code (IaC), Data Architecture, Apache Kafka, Tailwind CSS, Spring, APIs, Java, Artificial Intelligence (AI), Generative Artificial Intelligence (GenAI)
Head of Engineering
2022 - 2024
Revolutio
- Designed cloud-based architecture for SaaS platform from scratch. Optimized costs for low-volume clients using serverless, event-driven architecture. Achieved infrastructure stack isolation for high-volume clients using multi-tenancy design patterns.
- Developed generative AI assistants for information retrieval and task automation. Leveraged step functions to build agents integrating multiple assistants, enabling a multistep approach to handling complex queries and tasks.
- Increased customer productivity by building plugins for Outlook, Word, and Slack to import relevant data. Reduced onboarding time by 30%. Set up CI/CD pipelines achieving <1% failure rate.
Technologies: Flutter, AWS IAM, Amazon DynamoDB, AWS Lambda, Amazon Bedrock, Amazon Cognito, React, Next.js, Node.js, OpenAI, Architecture, Material UI, TypeScript, JavaScript, JSON, Optical Character Recognition (OCR), WhatsApp API, WhatsApp Business, Google Cloud Platform (GCP), AI Integration, Architectural Design, Fractional CTO, Scalable Platforms, AI-enabled Applications, Advisory, Communication, Orchestration, Agentic AI, AI Agents, Front-end, MySQL, FastAPI, Terraform, Angular, CI/CD Pipelines, Event-driven Architecture, RESTFul APIs, AWS Glue, Amazon EC2, Amazon Elastic Container Service (ECS), Infrastructure as Code (IaC), Amazon RDS, Data Architecture, Apache Kafka, Tailwind CSS, Spring, APIs, Artificial Intelligence (AI), Generative Artificial Intelligence (GenAI)
Senior React Native Engineer
2023 - 2023
Gartner - Peer Insights
- Participated in the release of the Gartner Peer Community, a platform for peer-driven business decisions. Added web pages, rebranded existing pages, and synchronized updates across iOS and Android.
- Took responsibility for the web release of channels in the Gartner Peer Community, allowing users to post and watch content in specific channels.
- Served as one of three leads responsible for the release of new products split from the Gartner peer platform to peer insights and peer community. This involved several updates in iOS, Android, web, and mobile web.
Technologies: React Native, JavaScript, Agile, Redux, CSS, Test-driven Development (TDD), Large-scale Distributed Systems, NoSQL, API Integration, Full-stack, Next.js, Node.js, Architecture, TypeScript, JSON, Architectural Design, Communication, Front-end, CI/CD Pipelines, RESTFul APIs, Tailwind CSS, APIs
Coding Tech Lead
2022 - 2022
Buzz
- Built a desktop web app for remote collaboration using Flutter and AWS, including floating widgets for notifications and video, real-time syncing of user calendars and slack statuses, and teams to organize the workplace.
- Designed and built a new feature for creating teams, presenting organization hierarchy, and allowing people to join meetings and show the statuses of other team members. Most clients heavily demanded this feature; it was delivered in two months.
- Acted as a team lead, established processes for backlog grooming, scheduling releases, and updates, streamlining communication around reporting and fixing bugs, and creating documentation for all features and roadmap.
Technologies: Flutter, PostgreSQL, Amazon Web Services (AWS), Dart, Videos, Audio, Agile, Test-driven Development (TDD), Cloud, Large-scale Distributed Systems, Technical Leadership, Slack API, Software Architecture, NoSQL, API Integration, Full-stack, Architecture, JavaScript, JSON, Google Cloud Platform (GCP), Expo, Architectural Design, Scalable Platforms, Communication, Orchestration, Supabase, Front-end, MySQL, CI/CD Pipelines, RESTFul APIs, Amazon EC2, Infrastructure as Code (IaC), Data Architecture, APIs
AWS Expert
2022 - 2022
Com2 Media LLC
- Developed a journaling app using React Native, allowing users to write notes, follow users, and get notified when a new journal is entered by people they follow.
- Built the client's app from scratch, integrating with MongoDB for document storage and Lambda for triggering notifications.
- Established the back end infrastructure as a code and connected MongoDB events with AWS services using EventBridge to get real-time updates. Added analytics using Pinpoint and SNS.
Technologies: MongoDB, Amazon Web Services (AWS), iOS, Realm, React Native, Agile, Test-driven Development (TDD), Cloud, Distributed Systems, Software Architecture, NoSQL, API Integration, Architecture, JSON, Architectural Design, Communication, Orchestration, RESTFul APIs, APIs
Lead Developer
2022 - 2022
Mymory
- Designed multimodal data ingestion pipelines to capture information in a unified format from multiple 3rd-party apps and real-time sources. Built Android, iOS, and web apps for customers to store, query, and organize information.
- Designed and developed the complete back-end infrastructure built on a serverless framework using AWS Lambda, authenticating via Cognito, and using DynamoDB and S3 to store data and objects.
- Integrated state-of-the-art machine learning tools for object detection in videos, OCR in-text images, data extraction from PDFs, and finding relevant results from searches based on natural language.
Technologies: Flutter, Amazon Web Services (AWS), AWS Amplify, Amazon Transcribe, Amazon Comprehend, Pinpoint, Amazon S3 (AWS S3), Amazon Cognito, AWS Lambda, MySQL, Amazon EC2 API, REST, SaaS, Agile, Streaming, Music Streaming, Test-driven Development (TDD), Cloud, Software Architecture, Cloud Firestore, Firebase Cloud Functions, NoSQL, API Integration, Full-stack, Architecture, Material UI, JavaScript, JSON, WhatsApp API, Google Cloud Platform (GCP), Expo, AI Integration, Architectural Design, Scalable Platforms, AI-enabled Applications, Communication, Orchestration, Front-end, FastAPI, Angular, CI/CD Pipelines, Event-driven Architecture, RESTFul APIs, AWS Glue, Amazon EC2, Infrastructure as Code (IaC), Amazon RDS, Data Architecture, Apache Kafka, APIs
Senior Back-end Engineer
2021 - 2022
Digibuild
- Designed and built several workflows for order fulfillment, including invoices, quote, purchase orders, and more.
- Built the testing framework for the back end and front end to verify database migrations, API-level unit tests, and screen UI testing, integrating those tests into the deployment pipeline.
- Modularized the front-end code to build a more scalable architecture. Optimized GraphQL and REST back-end API queries, improving latency and cost.
- Integrated with several AWS services for messaging, notifications, serverless back end, and scheduled jobs, improving the usability of Digibuild software.
- Designed the blockchain framework to store transactions on the Ledger using AWS-managed blockchain.
Technologies: React, PostgreSQL, Amazon Web Services (AWS), Blockchain as a Service, GraphQL, JavaScript, REST, SaaS Design, React Native, Agile, Test-driven Development (TDD), Cloud, Large-scale Distributed Systems, Software Architecture, API Integration, Full-stack, Architecture, JSON, Architectural Design, Communication, Front-end, CI/CD Pipelines, RESTFul APIs, Infrastructure as Code (IaC), Data Architecture, APIs
Senior Software Development Engineer
2019 - 2022
Amazon.com
- Designed and built a batch ingestion pipeline to process over a billion knowledge facts, generate additional lexical properties with a 50% reduction in execution times, and 25% less storage space.
- Optimized big data workflows and ETL jobs to achieve over twofold increase in efficiency and 85% cost reduction, while simultaneously scaling data ingestion from 100 million to over two billion facts per day.
- Developed natural language models, expanded the knowledge graph database of Alexa, to understand and respond to a broader spectrum of queries with minimal latency.
Technologies: Java, Python, TypeScript, Go, Amazon Web Services (AWS), Back-end, REST APIs, MySQL, Amazon EC2 API, REST, Spark, Amazon DynamoDB, AWS Lambda, AWS Step Functions, AWS IAM, Amazon S3 (AWS S3), AWS CloudFormation, Agile, Test-driven Development (TDD), Cloud, Large-scale Distributed Systems, Distributed Systems, Technical Leadership, Software Architecture, NoSQL, API Integration, Architecture, JSON, Knowledge Graphs, Communication, CI/CD Pipelines, RESTFul APIs, AWS Glue, Amazon EC2, Amazon Elastic Container Service (ECS), Amazon EKS, Infrastructure as Code (IaC), Amazon RDS, Data Architecture, Apache Kafka, APIs
Software Engineer 2
2018 - 2019
Intuit
- Built a company migrator tool to automate the cloning of all client-related information from one QA environment to another.
- Designed the API migration of services from in-house providers to AWS.
- Audited and fixed security bugs in microservices while transitioning to AWS.
Technologies: Java, Spring, Amazon Web Services (AWS), Spring Boot, Back-end, REST, Django, Agile, API Integration, JSON, Communication, CI/CD Pipelines, RESTFul APIs, APIs
Co-founder, Tech Architect
2017 - 2018
Naradd
- Designed the architecture and back-end implementation of the Naradd client portal. Built features for client onboarding, managing company information, and team-member access. Integrated APIs to send SMS, WhatsApp, email, and push notifications.
- Built query and analytics over large data files (uploaded by clients) using AWS Athena and Glue.
- Designed and implemented a pipeline to profile users and ensured optimal engagement across several communication mediums.
- Contributed to the initial development of the Naradd Android app. Integrated features for authentication, category selection, and subscribe and unsubscribe to companies.
- Built the Naradd web app for iOS users with integration to WhatsApp for transactional communications.
- Managed software development interns and assisted them in onboarding to web and app projects.
Technologies: React, Flutter, Java, Spring, Firebase, Amazon Web Services (AWS), Spring Boot, Back-end, React Native, REST APIs, REST, Django, Agile, Cloud Firestore, Firebase Cloud Functions, API Integration, JSON, Google Cloud Platform (GCP), Expo, Communication, Orchestration, Front-end, RESTFul APIs, Infrastructure as Code (IaC), Amazon RDS, Data Architecture, APIs
Software Engineer
2015 - 2017
PayPal
- Designed and built a microservice for reading transactions instantly from several domains, aggregating and storing to a unified database to be later shown up in the user's activity page. Reduced the ETA of read-to-write by 5x, down to 2 seconds.
- Developed a data reconciliation pipeline using Kafka and PayPal internal messaging queues. Dramatically reduced the messages in the exception queue and improved efficiency in data correction and storage to five times reliability.
- Built a patching tool by attaching the pipeline with a microservice for on-demand data correction. Integrated that with PayPal NFS for easy and fast upload of patch files, facilitating teams in maintaining data consistencies.
Technologies: Java, Spring, Spring Boot, Back-end, REST, Agile, API Integration, JSON, Spark, CI/CD Pipelines, RESTFul APIs, Amazon RDS, APIs
Open Source Contributer, GSoC
2014 - 2015
Apache OFBiz
- Integrated GenApp software with Apache Airavata for executing computational jobs on distributed resources.
- Built a Qt interface for the GenApp software to enable computation from mobile platforms.
- Extended Apache Airavata to include additional monitoring and workflow APIs.
Technologies: Java, Qt 5, Airavata, APIs, Back-end, JSON, RESTFul APIs
Experience
Android and iOS App for Notification Management
https://www.youtube.com/watch?v=hL4XwuOTk54An app for users to manage all their (existing) app notifications, organize SMS (coming soon), and most importantly, choose what type of notifications, in which fields, and from which companies they are open to receive them. It provides a unified platform for the user to gain complete control over the content they receive. The entire product range is divided into several categories (e.g., food, fashion, education) and further into sub-categories to filter down needs and requirements.
Businesses are our customers. We help them communicate with users without the need to develop a platform from scratch. Our business portal facilitates user segregation based on their chosen fields. Our primary medium is a notification, so user feedback can be collected in different forms (click time stamp, engagement time, feedback buttons, etc.), offering a higher engagement experience.
Businesses are our customers. We help them communicate with users without the need to develop a platform from scratch. Our business portal facilitates user segregation based on their chosen fields. Our primary medium is a notification, so user feedback can be collected in different forms (click time stamp, engagement time, feedback buttons, etc.), offering a higher engagement experience.
Android/iOS App for Apartment Rentals
A Flutter-based app for users to browse through rentable apartments, filter them based on location, price, number of rooms, and area, and locate them on a map. Realtors can add and update a list of apartments and mark them as available or rented. Administrators have additional control to edit and delete users.
Kickstarter on Ethereum
https://github.com/priyanshu-sekhar/Kickstarter-EthereumA concept model of Kickstarter using smart contracts on Ethereum. It allows users to add a project, request for funds in terms of ETH, vote for proposals, and allocate funds based on a predefined schedule.
Education
2011 - 2015
Bachelor's Degree in Electrical Engineering
Indian Institute of Technology, Kharagpur - West Bengal, India
Skills
Libraries/APIs
React, REST APIs, Slack API, Node.js, Amazon EC2 API, WhatsApp API, AWS Amplify
Tools
Expo, Terraform, AWS Glue, Amazon Elastic Container Service (ECS), Amazon EKS, Amazon Transcribe, Amazon Cognito, AWS Step Functions, AWS IAM, AWS CloudFormation, Amazon CloudFront, Flink, Amazon ElastiCache, AWS Key Management Service (KMS)
Languages
Java, Python, TypeScript, JavaScript, Solidity, GraphQL, Dart, CSS, Go, Java 8
Frameworks
Flutter, Spring, Spring Boot, React Native, Django, Spark, Redux, Tailwind CSS, Next.js, Material UI, Angular, Qt 5, Airavata
Paradigms
REST, Agile, Test-driven Development (TDD), Event-driven Architecture
Platforms
Firebase, Amazon Web Services (AWS), AWS Lambda, Google Cloud Platform (GCP), Amazon EC2, Apache Kafka, Blockchain, Ethereum, Music Streaming, FlutterFlow, iOS
Storage
Amazon S3 (AWS S3), MySQL, Cloud Firestore, NoSQL, JSON, PostgreSQL, MongoDB, Realm, Amazon DynamoDB, Elasticsearch, Redis
Other
Software Development, APIs, Back-end, Cloud, Large-scale Distributed Systems, Distributed Systems, Technical Leadership, Software Architecture, Firebase Cloud Functions, API Integration, Full-stack, OpenAI, Architecture, FastAPI, AI Integration, Architectural Design, Fractional CTO, Scalable Platforms, AI-enabled Applications, Communication, Orchestration, Agentic AI, Front-end, CI/CD Pipelines, RESTFul APIs, Infrastructure as Code (IaC), Amazon RDS, Data Architecture, Artificial Intelligence (AI), Generative Artificial Intelligence (GenAI), Software Design, SaaS, SaaS Design, Audio, Videos, Streaming, Optical Character Recognition (OCR), WhatsApp Business, Knowledge Graphs, Advisory, Supabase, AI Agents, Terraform Cloud, Amazon Comprehend, Pinpoint, Blockchain as a Service, Amazon Bedrock, AWS App Runner, DocumentDB
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