Rajat Kumar Rout

Backend Engineer · Founding Product Engineer

rajatrout470@gmail.com+91 9408142406linkedin.com/in/rajatrout github.com/rajatroutBengaluru, India

Summary

Backend engineer with 3+ years building microservices, event-driven systems, and fintech infrastructure at scale. Currently Founding Product Engineer at FlyWl — shaping product direction and owning backend systems end-to-end. Experienced in AWS, Kafka, ElasticSearch, PBAC, and AI-powered workflows. Strong track record of high-impact delivery in small, fast-moving teams.

Experience

FlyWl— Founding Product Engineer

Nov 2024 – Present

·Shaped product vision, feature scoping, and roadmap alongside founders
·Built Seller Profile & Claim Module end-to-end — CRUD with pagination/search, FUID generation via nanoid, seller claim flow, PBAC guards, login refactor, company attribute updates, and vendor search by website
·Engineered Notification & Analytics Event Engine from scratch — event builder, SNS publisher interface, event store consumer; integrated SuprSend (Email/Push) and Mixpanel analytics; session ID propagation via AsyncLocalStorage into structured logger
·Implemented PBAC permission system — role/permission guards, permission management APIs, FinOps and procurement roles, internal user migration permissions
·Built AWS Spend Modelling & EDP — spend comparison, EDP commitment costs, marketplace summary, drawdown overage and dead weight loss calculations; AWS Marketplace users migration
·Designed AI-powered vendor matching: LLM API enriches vendor details, creates embeddings stored in vector DB for semantic similarity search at match time
·Built Wallet/Credit Module — wallet creation API, global ledger, cron job for credit expiry, expired credit balance calculations
·Built Product Catalog search (ElasticSearch), User Invitations flow, and AWS Cognito authentication
·Used Cursor AI, ChatGPT, and Claude Code as force multipliers — cut feature delivery time by ~40%

Klub— SDE1 — Backend Engineer

Nov 2022 – Sept 2024

·Automated 98% of loan applications — reduced manual ops workload by 90%
·Built product config system with PostgreSQL indexing optimisations — 10× faster queries
·Document storage with polymorphic associations — 80% faster search performance
·Kafka event-driven data platform for NBFC partners — 70% faster data delivery SLA
·Managed 20+ BPMN workflows in Camunda — 50% fewer manual interventions
·Upgraded 7+ microservices from Node.js v12 to v18 with zero-downtime migrations

Skills

Languages & FrameworksTypeScript, JavaScript, Node.js, NestJS, Express.js, GraphQL

DatabasesPostgreSQL, MongoDB, Redis, ElasticSearch, Vector DB

Cloud & InfraAWS Lambda, SQS, SNS, CloudWatch, S3, Cognito, Serverless, AWS Marketplace, EDP

Messaging & EventsApache Kafka, Event-Driven Architecture, BPMN, Camunda

Auth & SecurityJWT, PBAC, ORY Oathkeeper, ORY Kratos, OAuth, AWS Cognito

AI & ProductivityCursor AI, ChatGPT, Claude Code, LLM APIs, Vector Embeddings

AnalyticsMixpanel, SuprSend, CloudWatch, AsyncLocalStorage, Structured Logging

Key Projects

Credit Engine

Full ledger + wallet management, ACID-safe earn/redeem/expire/rollback

Catalog Search Engine

ElasticSearch relevance scoring, fuzzy matching, custom analysers

Notification Engine

Multi-channel (Email/SMS/Push), async, deduplication-safe

Loan Automation Platform

98% automated loan processing, serverless, 90% ops reduction

Kafka Event Platform

Real-time NBFC data pipeline, schema-validated, 70% faster SLA

BPMN Workflow Engine

20+ Camunda processes, 50% fewer manual interventions