
Pranay Das
Verified Expert in Engineering
Software Engineer and Developer
West Lafayette, IN, United States
Toptal member since July 16, 2026
Pranay is a software engineer with 6+ years of experience building scalable back-end systems, distributed systems, and cloud-native applications across healthcare, fintech, and SaaS. He has built production systems at Eli Lilly, Natixis, Novo Nordisk, and YC-backed Instoried using Python, Go, FastAPI, Kubernetes, AWS, Kafka, PostgreSQL, and Temporal. Recently, Pranay has also built production AI applications using RAG, LangChain, and agentic workflows.
Portfolio
Experience
- Distributed Systems - 7 years
- FastAPI - 6 years
- Python - 6 years
- Data Structures - 6 years
- PostgreSQL - 6 years
- Redis - 6 years
- Agentic AI - 2 years
- RAG Systems - 2 years
Preferred Environment
Windows Subsystem for Linux (WSL), Linux, Windows
The most amazing...
...thing I've engineered are distributed AI workflows that automated enterprise document processing and transformed customer support operations.
Work Experience
Software Developer
Eli Lilly
- Incorporated Thomson Reuters Legal Tracker APIs into Eli Lilly’s legal systems, ensuring secure and efficient compliance workflows.
- Designed AI/LLM-driven tools to summarize legal documents, helping lawyers and analysts quickly extract key insights.
- Constructed and fine-tuned back-end services using Node.js, TypeScript, Python, and AWS (Lambda, API Gateway, S3), enhancing scalability and performance, and integrated RAG.
- Automated legal processing through custom API integrations.
- Developed RESTful APIs using Go with Gorilla Mux and integrated them into AWS-hosted services.
Open Source Software Developer
Google Summer of Code
- Developed the scorecode PyPI package in Python to fetch and store OpenSSF Scorecard data via the OpenSSF public API.
- Created Django mixin models for seamless integration of Scorecard data into platforms like Scancode.io and PurlDB.
- Implemented a pipeline within Scancode.io to retrieve and store Scorecard data, enhancing SBOM exports in CycloneDX format.
- Conducted comprehensive testing using pytest across repositories (e.g., TensorFlow/TensorFlow, Apache/Spark) to ensure accurate data integration.
Freelance Software Developer
Novo Nordisk
- Innovated and eliminated manual document checks, yielding a remarkable 70% boost in productivity using serverless workflows and cloud technologies.
- Designed cutting-edge automation technology, reducing error rates to an impressive 3% and ensuring precise compliance.
- Streamlined proprietary algorithms to cut compliance check times by 70%, leveraging REST APIs and high-throughput data processing.
- Improved notification response times by 90% via optimized back-end services and event-driven architecture.
- Developed a high-performance web service with Go/Gin, built for horizontal scalability up to 1+ million requests per second, using Docker and Kubernetes.
Freelance Software Developer
Natixis Investment Managers
- Achieved a 20x productivity increase by building an internal KYC portal using FastAPI, React, and PostgreSQL to unify fragmented processes.
- Designed and implemented AML and fraud detection tools using Python, integrating a lightweight ML engine to reduce manual checks by 70%.
- Built in-house PDF automation with Node.js and Next.js, cutting document processing turnaround by 80%.
- Seamlessly integrated 3rd-party bank systems (Orbis, Worldcheck by Refinitiv, Moody’s Compliance Check) for enhanced operational efficiency.
Senior Software Developer | Founding Engineer
Instoried
- Led back-end development for AI-driven content solutions using Node.js (Nest.js), Go (Gin), and FastAPI, driving a 150% increase in company valuation.
- Built a lightweight background task queue engine in Node.js to run async jobs with retry logic and Redis-based persistence.
- Architected microservices using Docker, Kubernetes, and Redis, improving back-end scalability and service isolation.
- Deployed and maintained infrastructure using Terraform, AWS EC2, S3, and Jenkins, reducing hosting costs by 50%.
- Orchestrated end-to-end development of Flask and FastAPI microservers for a robust back end.
- Facilitated exposure of deep learning algorithms, developing NVIDIA GPUs, and the software development lifecycle, boosting core functionalities.
- Handled authentication and user management with OAuth2, improving platform security and session control.
- Designed ML workflow orchestration with Node.js and Python-based microservices and deployed them on AWS using Docker and Terraform.
Software Developer | Back-end Engineer
KaptureCRM
- Engineered a microservice using Spring Boot to ingest social feeds (e.g., Shopify, Facebook, Instagram) into the CRM system as tickets.
- Combined 50+ REST connectors across diverse platforms (Shopify, Facebook, Instagram, 99acres) into a database.
- Utilized MongoDB and Spring Data for efficient serialization and deserialization of NoSQL data structures.
- Developed sync Engine to transfer data from Snowflake, Salesforce, and Shopify to CRM and Postgres to sync data between 2 isolated systems.
Experience
KYC Application for Investment Bank
• Developed distributed microservices using Python, FastAPI, Kafka, PostgreSQL, Redis, Docker, and Kubernetes.
• Integrated multiple external banking and regulatory APIs for PEP screening, sanctions screening, corporate registry lookup, shareholder analysis, and adverse media search.
• Built real-time workflow tracking using Redis caching and Kafka events, enabling analysts to monitor screening progress without blocking on slow external providers.
• Implemented retry policies, exponential backoff, dead-letter queues, correlation IDs, and centralized logging for production observability.
• Reduced manual compliance processing by over 60%, improving screening turnaround from 1 week to approximately 2 days.
Workflow Automation using AI agents
Education
Master's Degree in Computer Science
Purdue University - West Lafayette, IN, USA
Bachelor's Degree in Computer Science
Sambalpur University - India
Certifications
CompTIA Security+ SY0-501
CompTIA
Skills
Libraries/APIs
Node.js, REST APIs, React, OpenAPI
Tools
Pytest, Terraform, Jenkins, Postman
Languages
Python, JavaScript, SQL, TypeScript, Go, Snowflake, GraphQL
Platforms
Amazon Web Services (AWS), Google Cloud Platform (GCP), AWS IoT, AWS Lambda, Docker, Kubernetes, Shopify, Salesforce, Apache Kafka, Linux, Windows
Storage
Redis, PostgreSQL, Amazon S3 (AWS S3), MongoDB, Spring Data
Frameworks
Django, Flask, Gin, Spring Boot, Next.js, gRPC, Swagger
Paradigms
Parallel Computing, Security Software Development
Other
FastAPI, Data Structures, Distributed Systems, Back-end, Agentic AI, RAG Systems, Gorilla Mux, CycloneDX, NVIDIA GPU, Facebook, Instagram, Serverless Workflows, Single Sign-on (SSO), Algorithms, Reverse Engineering, Mathematics, Cryptography, Networks, IT Security, Windows Subsystem for Linux (WSL), Temporal, LangChain
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring