I engineer resilient software systems and endurance outcomes.

System reliability meets human endurance discipline.

Senior full-stack developer with 18+ years of experience in fintech architecture, APIs, onboarding funnels, and payment reliability layers. My athletic progression applies the same principles: structured execution, feedback cycles, and constraint-aware performance design.

Full-Stack Developer Fintech & Payments API & Backend Systems Marathon & Ultra Runner 100 KM Ultra Goal
.NET .NET Core C# Node.js NestJS Next.js Angular PostgreSQL SQL Server Payments APIs
About

Technology, metrics, delivery, and disciplined progression.

I design and deliver backend-first distributed systems, modernize legacy platforms, and implement multi-gateway payments in regulated fintech domains with full system ownership.

Identity: Developer × Runner
Developer

Backend reliability, clean service contracts, scalable payment abstractions, and modernization ownership end-to-end.

Runner

Structured mileage, loop-based pacing discipline, deliberate recovery cycles, and race-driven execution checkpoints.

Running

My Running Journey

Races as execution checkpoints, training as adaptive system loops.

13
Races Completed
100 km
Longest Ultra
3:57
Best Marathon
Tata Mumbai Marathon 2026
January 2026 · 42 km · 04:12:21
Tata Steel World 25K Kolkata 2025
December 2025 · 25 km · 02:22:40
The Border Run 100KM Ultra
6–7 December 2025 · Jaisalmer–Longewala · 100 km · 14:59:00
Mehsana Marathon 2025
November 2025 · 42 km · 3:57
Vedanta Delhi Half Marathon
October 2025 · 21 km · 01:54:52
Mount Abu International Half Marathon
August 2025 · 21 km · 03:05:59
The Hell Race Goa Ultra 60KM
August 2025 · 60 km · 9:23:39
Lonavala Fog Run Ultra
5 July 2025 · 50.62 km · 6:54:58
TCS World 10K Bengaluru 2025
April 2025 · 10 km · 00:58:08
Adani Night Ultra 60K
March 2025 · 60 km · 8:29:08
Leh Ice Marathon (Pangong)
25 February 2025 · 42 km · 6:54:32
Tata Mumbai Marathon
January 2025 · 42 km · 4:49:00
Adani Marathon 2024 (First Marathon)
24 November 2024 · 42 km · 4:51:00
Services

Engineering Capabilities

Backend reliability, payments abstraction, and modernization ownership.

API & Backend Systems

Secure, observable, high-reliability service delivery.

Payments Reliability

Multi-gateway abstraction, reconciliation, risk-aware performance.

System Modernization

Legacy migration, version upgrades, refactoring using metrics.

Contact

Connect for engineering collaborations

For architecture discussions or system delivery.

Email
tarun.jadav@gmail.com
Location
Vadodara, India.
Focus
Fintech, Payments, API reliability, System modernization, Endurance systems