Data & Automation Engineer • Platform Owner & Maintainer

Hi, I'm Rishav Kumar

Data & Automation Engineer | Platform Owner & Maintainer (iMigrator) • Cognizant

Python application developer and iMigrator platform owner at Cognizant, focused on application development and maintenance, Python automation tools, and Jenkins-scheduled execution of long-running jobs. Improved benchmark processing by up to 3x using Polars and DuckDB and resolved low-memory failures. Built a shared-folder, three-tier application updater and co-developed Snowflake pushdown reconciliation and AWS Bedrock / Claude diagnostics. iMigrator supports 15+ database platforms and 12+ data formats; my connector contributions are listed in the experience details.

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⚡ Cognizant • Automation Team

Rishav Kumar

📍 Kolkata, India

Platform Owner • iMigrator

LANGUAGES & CORE TECH

Python 3.12 SQL Bash

HIGH-PERFORMANCE ENGINES

Polars LazyFrames DuckDB In-Memory Pandas PyArrow psutil (Dynamic RAM)

AI DEVELOPER TOOLS (IDE & CHAT)

Google Antigravity Claude Code (CLI) GitHub Copilot Agentic Workflows

AI MODELS & SYSTEMS

AWS Bedrock (Claude Sonnet) Google Gemini API Google ADK Prompt Engineering Agentic Workflows

DATA PLATFORMS SUPPORTED (iMIGRATOR)

Microsoft Fabric Snowflake Databricks DynamoDB Oracle PostgreSQL MS SQL Server IBM DB2 & AS400 Sybase MongoDB 15+ Heterogeneous Connectors

DEVOPS, PACKAGING & QA

Jenkins Automation Jobs (Groovy) PyInstaller (3-Tier Hot-Swap) Agile Lifecycle Automation (Rally) Git / GitHub

// TECHNICAL ARSENAL

Core Technical Competencies

Engineered for high-throughput distributed computation, heterogeneous cloud databases, GenAI pipelines, and autonomous test harnesses.

💻

Programming & Core Tech

Production-grade systems programming, AST parsing, high-concurrency multiprocessing, and Windows OS API automation.

Python 3.12 (OOP & AST) SQL (Complex DDL / DML) Bash / Shell Multiprocessing & Concurrency Windows API Process Handling PyInstaller Packaging

⚡

High-Performance Data Engines

Memory-optimized columnar computation engines replacing traditional memory-bound iterations with zero-OOM processing for 50M+ rows.

Polars LazyFrames DuckDB In-Memory Pandas PyArrow psutil (Dynamic RAM Sizing)

🛠️

AI Developer Tools & Workflows

Deep daily integration of frontier AI coding tools, autonomous agents, and conversational intelligence across VS Code and terminal workflows.

Google Antigravity Anthropic Claude Code (CLI) GitHub Copilot Agentic Pair Programming

☁️

iMigrator Connector Coverage (15+)

Product capability list for iMigrator. Personal connector contributions are described in the experience section; this list does not imply practical SQL or administration experience on every database.

Snowflake Microsoft Fabric Databricks AWS DynamoDB Oracle & Exadata PostgreSQL Amazon Aurora (PostgreSQL / MySQL) MS SQL Server (MSSQL) MySQL IBM DB2 & DB2 AS400 Sybase (jConnect & jTDS) MongoDB Amazon Redshift Amazon Athena & AWS S3 IBM Netezza SAP HANA SAS SQLite Cross-DB Staging Tables

📂

iMigrator File-Format Support

Product capability list for iMigrator, not a claim of hands-on experience with every listed format. Practical Excel and ETL experience is described in the experience section.

Apache Parquet Apache Avro Nested JSON (Deep Flattening) XML / XSD Excel (OpenPyXL / XlsxWriter) CSV / Delimited DAT Files Flat Files Fixed-Width Formats CLOB / BLOB Extraction SAS7BDAT PDF Extraction CTRL Control Files

🤖

Generative AI & Diagnostics

Autonomous failure clustering and root-cause diagnostics integrating cloud foundational models for automated reconciliation.

AWS Bedrock Anthropic Claude Sonnet Google Gemini API Google Agent Development Kit (ADK) Prompt Engineering Structured JSON Extraction

🚀

Jenkins Automation & App Packaging

Jenkins jobs for scheduled, long-running Python automation on higher-resource CI servers, with email results; PyInstaller-packaged desktop applications and shared-folder self-updates.

Jenkins Scheduled Job Automation Groovy Scripting Background Python Runs & Email Results PyInstaller (3-Tier Self-Updater) Windows API Handling Enterprise Network Distribution

🛡️

Test Governance & Data Validation

Enterprise QA orchestration, automated defect lifecycle management, DDL schema drift tracking, and Informatica pipelines.

Agile Test Management (Rally) Schema Drift Detection STTM & Data Vault Validation MD5 Keyless Reconciliation Informatica PowerCenter DML Execution Blockers

// CAREER TRAJECTORY

Professional Experience

Proven product ownership, architectural migrations, and production-grade engineering at Cognizant.

Experience at Cognizant

Cognizant Technology Solutions • Full-Time & Internship

Intern → Trainee → Programmer Analyst 03/2025 – Present

Programmer Analyst

Data & Automation Engineer • Platform Owner & Maintainer (iMigrator)

★ Promoted Aug 2026 08/2026 – Present

Platform Ownership & Releases: Took ownership of iMigrator as sole platform owner and maintainer; leading its maintenance, releases, roadmap, and user support across multiple projects, currently delivering the next major release.
Core Engine & DuckDB Validation: Inherited an unstable engine and independently introduced DuckDB-based validation to deliver up to 3x faster processing in benchmark runs while eliminating out-of-memory crashes on low-RAM user systems.
Chunked Processing & Memory Stability: Improved and stabilised inherited chunked processing logic and dynamic memory controls, resolving critical execution issues and ensuring reliable processing across high-volume datasets.
Snowflake Pushdown Reconciliation: Co-developed cross-database pushdown reconciliation staging heterogeneous source data into temporary Snowflake tables, executing distributed in-warehouse joins to eliminate client-side memory constraints and heavy network transfer.
GenAI Failure Diagnostics (AWS Bedrock & Claude): Co-developed an autonomous diagnostic module clustering validation failure patterns and generating structured JSON root-cause classifications and remediation SQL.
Connector Integrations & User Support: Added or extended MongoDB, Snowflake token-based authentication, CTRL-file, and DB2 integrations. iMigrator supports 15+ platforms; the broader product coverage is not a claim of hands-on expertise in every database.
Self-Updater & Packaging: Built standalone self-updater utilities and production executable packaging using PyInstaller, enabling automated distribution and updates with rollback safeguards.
Jenkins Job Automation: Configured Jenkins jobs to run Python automation applications on higher-resource CI servers; scheduled and background runs support long-running tasks, with email results after completion.
Rally Test Automation & Result Sharing: Built standalone automation utilities for bulk test case creation and execution updates in Rally; created a two-part executable design allowing scripts to write JSON results that are loaded into PostgreSQL without distributing database credentials.

Programmer Analyst Trainee

ETL Testing & Data Quality Specialist → Automation Developer

★ Top Performance Rating 08/2025 – 08/2026

Phase 1: ETL Testing (First 7 Months) Phase 2: Automation Developer (Automation Team)

Top Performance Rating & Accelerated Promotion: Conferred top performance rating in 1st-year confirmation appraisal; recognized by leadership for rapid engineering mastery and pivotal architecture contributions to the iMigrator platform, earning accelerated promotion to Programmer Analyst in August 2026.
Automation Team Transition (Subsequent Months): Following the initial 7-month ETL testing phase, transitioned into the Automation Team as an Automation Developer; authored modular Python utilities for automated test case generation, data-stat profiling, defect verification, and foundational reconciliation routines for iMigrator.
Enterprise ETL Testing (First 7 Months): Executed comprehensive end-to-end source-to-target test verification, data quality audits, and migration testing across multi-LOB data warehouse pipelines.
SQL & Reconciliation Verification: Formulated complex SQL reconciliation queries across Snowflake and Oracle targets, validating business transformations, primary key constraints, null bounds, and precision.
Defect Lifecycle Management: Documented and tracked critical ETL pipeline anomalies, schema mismatches, and data drift in CA Agile Central (Rally), collaborating closely with data engineering teams to remediate pipeline bugs prior to production cuts.

Data Engineering Intern

Informatica PowerCenter & ETL Foundations

03/2025 – 07/2025

Healthcare Data Integration Pipeline: Designed and implemented an end-to-end ETL integration system using Informatica PowerCenter to process multi-source healthcare insurance feeds (Group, Subgroup, Subscriber fixed-width and comma-delimited flat files) into dimensional Oracle tables.
Transformations & Data Cleansing: Built robust mapping logic leveraging Expression, Filter, Router, Joiner, and Sequence Generator transformations to standardize formats, eliminate duplicate records, and route error data to dedicated exception tables.
XML Generation & XSD Validation: Engineered a downstream publishing workflow converting transformed subscriber data into structured, personalized XML welcome letters complying with strict XSD schema validation standards.
Workflow Design & Scheduling: Created, configured, and monitored automated workflow sessions in Informatica Workflow Manager, analyzing session logs and performance metrics to optimize throughput.

// PRODUCTION IMPACT

Featured Engineering Projects

Core platforms, autonomous assistants, and enterprise distribution systems engineered for high scale.

iMigrator — Data Validation & Reconciliation Platform

Python 3.12 • DuckDB • Snowflake Pushdown • Multi-DB Connectors (15+ Platforms) • AWS Bedrock • Claude • Jenkins

High-throughput enterprise data reconciliation platform adopted across multiple projects. Stabilised the inherited core pipeline and independently introduced DuckDB-based validation, delivering up to 3x processing speed in benchmark runs and eliminating crashes on low-RAM systems.

• Platform Ownership & Connector Integrations: Own and maintain iMigrator across multiple projects; added or extended MongoDB, Snowflake token-based authentication, CTRL-file, and DB2 integrations within a product supporting 15+ platforms.

• In-Warehouse Pushdown Reconciliation: Co-developed cross-database pushdown reconciliation staging heterogeneous source data into temporary Snowflake tables for distributed in-warehouse joins.

• Chunked Processing & Stability: Improved and stabilised inherited chunked processing routines and dynamic memory controls, eliminating crashes on user workstations.

• Keyless Fallback & Safety: Owned and maintained keyless fallback reconciliation routines and automated DML execution safeguards.

• GenAI Failure Diagnostics: Co-developed autonomous diagnostics with AWS Bedrock / Claude Sonnet, clustering mismatch patterns and returning structured JSON root-cause classifications.

• Reporting & Packaging: Improved HTML validation reports with enhanced console logging and fallbacks; built standalone self-updaters and packaging via PyInstaller.

DataCraft — Autonomous SQL & Data Engineering Assistant

Python • Google Agent Development Kit (ADK) • Gemini API • Firestore • Snowflake • BigQuery • PostgreSQL • Vertex AI

Autonomous multi-modal data engineering agent built with the Google ADK during Google's 4-Hour "Build with Gemini" hackathon; earned the Google Developers Track 3 badge.

• Dynamic Schema Catalog: Automated Firestore schema registration cataloging database schemas, primary keys, and data types across heterogeneous sources (list_tables, get_table_details, add_table).

• Anti-Pattern Detection: AST parsing with sqlparse to detect full table scans, missing filters, and uncapped sorting with Snowflake, BigQuery, and PostgreSQL optimizations.

• Multi-Modal Architecture Generation: Produced visual ER diagrams and animated Kafka event-streaming architecture diagrams leveraging Gemini multimodal models on Vertex AI with GCS storage.

• Vertex AI Memory Bank: Integrated PreloadMemoryTool for session-level dialect persistence, paired with AgentEngineSandboxCodeExecutor and a responsive FastAPI/A2UI card interface.

Enterprise Packaging & Multi-Tier Self-Updater

Python • PyInstaller • Windows OS Architecture • SQLite • Enterprise Network Distribution

Independently built a no-additional-hosting-or-licensing-cost updater that uses an existing shared folder and release/version information to detect, verify, and stage newer application builds through a three-tier handoff: Launcher → Updater → Production Runtime.

• Self-Update Flow: The launcher hands control to the separate updater; it checks shared-folder release data, verifies a newer build, and replaces the application without asking a running process to overwrite its own locked files.

• Rollback & Distribution: Uses an existing shared folder for distribution, avoiding additional updater hosting or licensing costs; build verification and rollback safeguards protect the replacement.

• Zero Console Flashing: Leveraged Windows API process handling to provide silent execution with clean SQLite telemetry logging and network distribution.

• CLI Maintenance Utility: Authored automated CLI diagnostics and repair utilities for rapid environment health checks and client distribution audits.

Healthcare Payer Data Integration Pipeline

Informatica PowerCenter • Oracle SQL • XML / XSD • Flat File Processing

Production ETL integration pipeline processing fixed-width and comma-delimited healthcare feeds into dimensional Oracle tables with automated XML welcome letter distribution.

• Multi-Feed Processing: Cleaned, validated, and normalized multi-tier patient datasets across complex business transformations.

• Schema Compliance: Validated outgoing XML welcome records against strict enterprise XSD schema definitions.