L Chakka
Software Engineer | Python & AWS Backend Specialist • London, UK • l**********@gmail.com • +44*******369 • drivetube.ai/•••••
Professional Summary
Software Engineer with 3+ years of experience building Python backend systems and AWS serverless architectures. Skilled in designing production-grade microservices, event-driven ingestion pipelines, and orchestration workflows for enterprise insurance and data-driven products. Hands-on with AWS Lambda, API Gateway, S3, SQS, DynamoDB, Step Functions, FastAPI and Pydantic; strong practice in BDD/pytest, LLD documentation, CI/CD, and peer code review to deliver reliable, testable services.
Technical Skills
Programming Languages: Python,Shell Scripting
Web Technologies: REST APIs
Frameworks and Libraries: FastAPI,Flask,Pydantic,boto3,AWS Lambda Powertools,Pandas,NumPy,scikit-learn
Databases: SQL,DynamoDB,PostgreSQL,MySQL,S3 object store
Cloud and DevOps: AWS Lambda,API Gateway,S3,SQS,SNS,Step Functions,EventBridge,CloudWatch,AWS Transfer Family,AWS SAM,GitHub Actions,Jenkins,CloudFormation,SAM
Testing: pytest,behave BDD,unittest,Test-Driven Development,BDD test automation
Tools and Methodologies: Git,Bitbucket,Postman,Jira,Structured Logging,Monitoring,Peer Code Review,Agile
Architecture & Design: Serverless,Microservices,Event-Driven Systems,OpenAPI,Swagger,Low Design
Work Experience
Cognizant (Client: Direct Line Group, UK)
Remote, UK
Software Engineer — Python & AWS Backend
Feb 2026 – Present
Delivered serverless Python backend microservices for Cognizant supporting Direct Line Group (insurance) partner file ingestion, monitoring, and onboarding orchestration.
Tech Stack: Python, AWS Lambda, API Gateway, S3, SQS, SNS, DynamoDB, Step Functions, EventBridge, AWS Lambda Powertools, Pydantic, FastAPI, pytest, behave, OpenAPI, Swagger, CloudWatch, SAM, Git
- Designed and implemented AWS Lambda microservices to process partner file uploads (Invoice, Rates, Landmarks, Subpartners) including base64 decoding, Pydantic data-contract validation, and secure S3 persistence for downstream processing.
- Built event-driven fleet file monitoring using EventBridge Scheduler and partner API integrations to detect missing daily files, publishing events to SQS and SNS to trigger automated notification flows.
- Developed partner onboarding orchestration using Step Functions and EventBridge to coordinate multi-step business processes across Lambda microservices, reducing manual handoffs and simplifying error handling.
- Authored comprehensive BDD and pytest suites covering end-to-end Lambda flows, SQS message processing, and DynamoDB persistence, achieving high coverage and enabling safer iterative releases.
- Produced clear Low Level Design documentation and maintained OpenAPI/Swagger specs aligned with Pydantic models, accelerating developer onboarding and ensuring API-consumer alignment.
- Led peer code reviews and used AWS Lambda Powertools for structured logging and CloudWatch monitoring to improve observability, shorten incident triage, and maintain sprint delivery commitments.
YVR Technologies
Remote
Junior Software Engineer (Intern)
Oct 2023 – Oct 2024
Built Python data pipelines and integration APIs for a commercial analytics product to improve data availability and support business decision-making.
Tech Stack: Python, Pandas, NumPy, REST APIs, pytest, Git, Postman
- Implemented Python-based ETL pipelines and validation checks using Pandas to improve data availability and enable a 20% increase in data-driven business decisions.
- Analysed complex datasets and delivered actionable insights to senior management, identifying operational improvements that supported product and stakeholder decisions.
- Collaborated with Analytics Engineers to define and enforce data quality rules, reducing data discrepancies by 25% through automated validations and reconciliation jobs.
- Built and maintained RESTful API integrations in Python to enable reliable data exchange between internal systems and third-party services.
- Promoted data engineering best practices across teams by standardising workflows, reusable functions, and documentation to improve handoffs and reduce onboarding time.
- Wrote unit and integration tests for pipeline components and supported deployment workflows to staging, improving release reliability and reducing regressions.
Tata Consultancy Services (TCS)
India
Assistant System Engineer
Jul 2021 – Jul 2022
Contributed Python automation and testing as part of delivery teams implementing business process automation and system integrations for enterprise clients.
Tech Stack: Python, PyTest, Shell Scripting, Git, CI, CD tools, Documentation and runbooks
- Developed and deployed Python automation scripts to streamline business process workflows, contributing to an estimated 20% improvement in operational efficiency for delivery processes.
- Executed comprehensive test automation using PyTest to validate configured system actions, catching defects early and reducing system downtime through improved release quality.
- Collaborated with cross-functional teams on requirement analysis, system design and implementation to deliver reliable automation solutions aligned with business needs.
- Contributed to process improvements and deployment practices that supported a 25% improvement in measured customer experience through more reliable releases.
- Supported CI/CD and release activities, coordinating build, test and deployment tasks to ensure smooth rollouts and rollback readiness.
- Participated in peer reviews, documentation of technical decisions, and maintenance of runbooks to improve team knowledge sharing and operational response.
Software
Education
University of East London
Master of Science in Computer Science • London, UK • Sep 2022 – Sep 2024
VR Siddhartha Engineering College
Bachelor of Technology in Information Technology • India • Jun 2017 – Jul 2021
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