Jay Prakash Sonkar

Senior Software Engineer | Payment Systems | Backend
Software Development Engineer II
Fynd, Shopsense Retail Technologies Limited
Noida, Uttar Pradesh

Senior Software Engineer with 5 Years and 5 Months of experience, specializing in Payment Systems and Backend Engineering. Delivered 499 tasks at 97.8% completion across 3 years at Fynd, with 7,400+ commits across 19 repositories and 25+ version releases on the payments platform. Deep expertise in Python, FastAPI, distributed systems (Kafka, Redis), and fintech integrations (15+ payment aggregators). Builder of open-source developer tools including PRView and JaySoft-DBMocker. Recipient of 6 quarterly Fynd Star awards and the annual "One Man Army" award.

Backend Development: Developed the Payments and Refund System.
Integration Expertise: Integrated Razorpay Partnership Model, & Custom Checkout Integration for Jio1Pay, Tirabeauty.
API Development: Automated APIs, enhanced Payment and Refund APIs, and extended Payment functionalities.
Database Management: Handled SQL Scripts and Migrations for efficient data processing.
Scripting Skills: Proficient in Bash, and Python scripting for varied applications.
Delivery Scale: 499 tasks completed at 97.8% rate, 7,400+ commits across 19 repos, 25+ version releases on the payments platform.
Security: Led encryption key rotation across 5 repos, CVE remediation, auth token hardening, and bank account exposure fixes.

Data Structures & Algorithms: Solved 700+ DSA problems, showcasing problem-solving capabilities.
Competitive Coding: Qualified for ACM-ICPC 2018 Regionals.
Teaching & Mentorship: Resolved 1300+ student doubts on Chegg.
Open-Source Contributions: Maintained 70+ repositories on GitHub, highlighting active participation in the developer community.
Awards & Recognition: Earned 10+ accolades and certifications for technical proficiency — including 6 quarterly Fynd Star awards and 1 Fynd Annual "One Man Army" award for independent end-to-end feature ownership.
Self-Initiated Tools: Built 30,000+ LOC of developer tooling outside Jira work — PRView (FastAPI + React/TS, GitHub published), JaySoft-DBMocker (pip package, 20,939 LOC), PED App (API proxy/mock server).
Infrastructure: Led encryption key rotation across 5 repos, Python 3.13 upgrade, multi-aggregator outage handling, and Brunt Phase 1 & 2 execution.

Work Experience | Projects

Fynd, Shopsense Retail Technologies Limited
Payments & Refunds | Dec 2022 to Present
Software Development Engineer II, 0.5 Years

Delivered 499 tasks at 97.8% completion across 3 years (2023–2026), with 7,400+ commits across 19 repositories and 25+ version releases on Fynd's payments platform (Gringotts). Received 6 quarterly Fynd Star awards and the annual "One Man Army" award.
Led encryption key rotation (JCP-8065, 67 commits) across 5 repositories — multi-level encryption support, beneficiary details migration, CSV-based batch revert, and zero-downtime secret rotation spanning gringotts, fynd-platform, fynd-platform-helm, and api-specifications.
Built multi-aggregator payment outage handling (JCP-10728, 80 commits) — V2 outage data in payment options response, per-aggregator resolution with merchant_code enrichment, and comprehensive E2E test coverage.
Integrated gRPC client for payment and refund init (JCP-1650, 58 commits) — transaction ID handling, deadlock resolution, and Docker infrastructure updates.
Migrated platform from legacy framework to FastAPI via pyFIT (FPCO-22488) — AIOKafka, AIORedis integration, and framework-level infrastructure changes.
Owned end-to-end refund pipeline — retry logic, currency mismatch fixes for international orders, stuck refund recovery, split refunds, and multi-aggregator refund flows (66+ tasks across the refund domain).
Launched Jio1Pay custom checkout for Tirabeauty (TIRA-7090, 88 commits) — custom checkout flow, TIRA platform integration, Redis keys, and load testing.
Integrated Razorpay partnership model in compliance with RBI guidelines — secure transactions without storing merchant credentials.
Pioneered UPI At Store (UPIAS) — in-store UPI transactions for POS/EDC devices, offline payment modes, and cross-platform payment method integration.
Implemented entity MOP visibility (JCP-10152, 31 commits) — DB-backed entity types with dynamic cart field extraction, integrated into create_order and payment_options flows.
Built cart charge apportioning (FPCO-34329, 30 commits) — cart charge distribution per MOP split with calculation scripts for JioMart.
Maintained OpenAPI specifications (283 commits in api-specifications) — Payment Options V2, entity MOP visibility, key rotation APIs, outage data schemas, FDK alignment, and SDK parity.
Remediated security vulnerabilities — Fortify critical/high severity fixes (JCP-10889), hard-coded password removal (FPCO-41972), bank account exposure (DSOP-15735), CVE fixes across simple-python and cashfree-python.
Delivered Python 3.13 upgrade (JCP-3736, 45 commits) — pyFIT v1.2.0 adoption, Docker/APK dependency updates, backward compatibility maintained.
Worked on JioOnePay payment extension (81 commits) — versioning system, decimal amount loss fixes, category ID and article price fixes, EMI changes.
Added observability and tracing — 24+ spans for refund webhooks, company_id, user_id; Sentry integration; resolved pod scaling (CrashLoopBackOff 19x → 110x) in Kubernetes.

Tata Consultancy Services [TCS]
Ericsson | Oct 2020 to Dec 2022
System Engineer (Digital), 2.2 Years

                                    Component Uplifts
Feature Development

                                    JaySoft-LogViewer
JaySoft-TestRunners

                                    JaySoft-WM_Grepper
JaySoft-BB_Downloader

Spearheaded Telecom domain initiatives, achieving a 25% improvement in system efficiency and streamlining feature enhancements.
Engineered and enhanced Python scripts, boosting operational process efficiency by 20%.
Managed system image upgrades via Yocto(Bitbake Build System), resulting in a 15% increase in system reliability and performance.
Drove critical enhancements for Ericsson Telecom, achieving a 10% increase in announcement sector efficiency.
Architected advanced security features for Ericsson Telecom, improving system integrity by 30% and reducing security threats.
Introduced utilities like JaySoft-LogViewer and JaySoft-TestRunners, boosting system operation efficiency by 20%.
Developed and refined tools such as JaySoft-WM_Grepper and JaySoft-BB_Downloader, enhancing system functionality by 18%.

Education & Qualifications

B.Tech, Computer Science & Engineering
BIET, Jhansi (Affiliated to AKTU)
Duration: July 2016 - Sep 2020
Percentage: 71.94%

Intermediate (12th Grade)
JNV, Faizabad (Affiliated to CBSE)
Duration: April 2014 - March 2015
Percentage: 81.60%

High School (10th Grade)
JNV, Faizabad (Affiliated to CBSE)
Duration: April 2013 - March 2014
Percentage: 81.70% (CGPA: 8.6)

Technical Skills

Udemy Certifications

HTML and CSS

Technical Certifications

Snackdown 17 , 19 & 21

Hackerrank Python Certificate

Hackerrank Problem Solving

Techgig C,C++

Techgig Python

TEQIP-3 AI & ML

Datapure Internship

Datapure Recommendation

Programmr Internship

ACM ICPC 2018 Regionals

Infosys Python Certificate

PDA Cyber Security

Internship & Part-time Roles

Chegg Expert
Chegg India · Part-time
Sept 2019 - Dec 2022 · 3 years, 4 months
Remote

Actively addressed and resolved student queries from around the globe.
Successfully tackled over 1300 challenges presented by students on the Chegg platform.
Demonstrated proficiency in Web Development and Data Structures & Algorithms (DSA).
Expertise in multiple programming languages including Python, C++, and Java.

Software Engineer Intern
Programmr.com · Internship
May 2019 - Jun 2019 · 45 days
India · Remote

Formulated interview challenges for student evaluations.
Devised a series of Python-based exercises for practice.
Offered structured solutions for the provided Python problems.
Assisted students in understanding Python problem-solving techniques.

Python Developer
DataPure · Internship
May 2019 - Jun 2019 · 45 days
Indore Area, India

Developed Python scripts for automated web scraping and data collection.
Designed a Python tool for data extraction from varied image sets.
Engaged in data analytics to derive actionable insights from datasets.
Functioned as a Computer Vision Expert, working on image processing and recognition projects.

Freelancing Contribution [Github Projects]

[2026]

PRView

Full-stack local PR review tool (FastAPI + React/TypeScript) — diff views, inline comments, threaded replies, merge/squash/rebase, conflict resolution. 6,300+ LOC built in ~2 weeks. Published on GitHub.

[2025]

JaySoft:DBMocker

Database mock data generator — 20,939 LOC, constraint-aware, parallel generation, 99.5% success rate across MySQL/PostgreSQL/SQLite. CLI + GUI. Packaged as pip-installable Python tool. Built in 6 days.

[2025]

JaySoft:DevBox

All-in-one local development toolkit powered by Docker — pre-configured databases, Kafka, Redis, monitoring (Prometheus & Grafana), and automated setup scripts.

[2025]

Kafka Docker Setup

Production-ready local Kafka environment (1,202 LOC) — 5-script architecture, 3-listener config, health checks, auto-recovery, JVM tuning, topic management. Used daily for Gringotts development.

[2024]