Backend Engineer

Mritunjay
Pratap Singh

I build scalable microservices, event-driven systems, and REST APIs that handle 100K+ daily transactions. Currently engineering backend systems at Kogta Financial.

Resume 
#!/usr/bin/env python3

class BackendEngineer:
    name    = "Mritunjay"
    role    = "Software Developer"
    stack   = ["FastAPI", "Flask",
               "PostgreSQL", "MongoDB"]
    passion = "Building systems that scale"

    def daily(self):
        return "100K+ messages processed ✓"

About

I'm a backend engineer who loves building systems that are fast, reliable, and elegant under the hood.

With 2+ years of experience, I specialize in Python, FastAPI, and event-driven architectures. I've built communication platforms processing 100K+ daily messages, multi-vendor integrations, and payment reconciliation engines.

2+Years
100K+Daily Msgs
40+APIs
3Services
PythonFastAPIFlaskDjangoPostgreSQLMongoDBMySQLAWS SQSAWS S3DockerRedisREST APIsCeleryOpenSearchSQLAlchemySQLModelBeanie ODMPandasGit

🚀 Currently exploring

KubernetesSystem DesignGoApache Kafka

Experience

Jul 2025 — Present

Software Developer · Kogta Financial India Limited

  • Architected Communication Aggregator Service with FastAPI, MongoDB (Beanie ODM), MySQL, and Redis, processing 100K+ daily messages across WhatsApp/SMS/RCS for 4 business verticals with 40+ REST APIs and AWS SQS-based async processing.
  • Built multi-vendor Dialer Service using Flask with orchestrator pattern — vendor detection, RBI-compliant number selection, and fallback logic with Redis caching, reducing manual effort by 80% for 50+ agents.
  • Developed Receivable Engine for NACH/Cheque processing with FastAPI, PostgreSQL (SQLModel + asyncpg), and multi-stage AWS SQS pipelines for validation, realization, and reversal workflows.
  • Redesigned message tracking system with unique identifiers and audit trails, improving traceability by 100% and reducing support resolution time by 50%.
FastAPIFlaskMongoDBPostgreSQLMySQLAWS SQSRedisOpenSearchDocker
Feb 2023 — Nov 2024

Python TA · Coding Ninjas

  • Developed internal tools using Django, DRF, and PostgreSQL to automate student support workflows.
  • Built and optimized REST APIs for real-time code evaluation and content delivery systems.
  • Mentored 500+ students in Python, DSA, and backend development, maintaining a 4.8/5 rating.
DjangoDRFPostgreSQLREST APIs

Projects

Communication Aggregator Service

Internal

Multi-vertical communication platform processing 100K+ daily messages across WhatsApp, SMS, and RCS for CRM, LMS, LOS verticals.

  • Event-driven architecture with AWS SQS for async batch processing, Redis + RQ for job scheduling, and webhook handling.
  • Integrated MongoDB (Beanie ODM) for message storage, MySQL for origination data, and OpenSearch for lead analytics.
  • Self-service Excel upload with Pandas processing, reducing campaign launch time from days to hours.
FastAPIMongoDBBeanie ODMMySQLAWS SQSRedisRQOpenSearchPandas

Multi-Vendor Dialer Service

Internal

Extensible adapter framework with orchestrator pattern supporting Ozonetel, Knowlarity, and Exotel with RBI-compliant automated number selection.

  • Built vendor detection, RBI-compliant number selector, and fallback orchestration with Redis-backed caching.
  • Real-time webhook processing for call status updates, CDR logging, and automated call recording retrieval via AWS S3.
  • Agent management APIs with role-based access, call assignment, and performance tracking dashboards.
FlaskMongoDBRedisSQLAlchemyAWS S3Pydantic

Receivable Engine (NACH Processing)

Internal

Automated payment reconciliation system handling NACH and cheque processing with batch validation, realization, and bank reversal workflows.

  • Event-driven architecture with multiple AWS SQS queues for upload, validation, realization, reversal, and email notification stages.
  • Async PostgreSQL with SQLModel + asyncpg, worker-consumer pattern for background processing.
  • Automated bank file parsing with Pandas and multi-format export for reconciliation reports.
FastAPIPostgreSQLSQLModelasyncpgAWS SQSPandasHTTPX

Education

B.Tech in Computer Science Engineering

Dr. A. P. J. Abdul Kalam Technical University

2019 — 2023 · CGPA: 8.6

Contact

Let's work together.

I'm open to new opportunities. Drop me a line and let's talk.

mritunjaypratapsinghh@gmail.com