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Hari Krishna

PROFILE

Hari Krishna

Over the past year, contributed to the nammayatri/nammayatri and shared-kernel repositories by designing and delivering robust backend features for multimodal transport, payment processing, and analytics. Leveraged Haskell, SQL, and Kafka to build APIs for booking, fare feedback, loyalty, and real-time metrics, while optimizing data models for reliability and traceability. Enhanced payment flows with flexible settlement ingestion, user-defined fields, and offer SKU customization, and improved operational visibility through latency instrumentation and detailed reporting. Addressed race conditions, booking accuracy, and reconciliation challenges by refining database schemas and integrating real-time streaming, demonstrating depth in backend development, API integration, and functional programming.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

62Total
Bugs
8
Commits
62
Features
38
Lines of code
15,031
Activity Months12

Work History

July 2026

4 Commits • 2 Features

Jul 1, 2026

2026-07 Monthly Update for nammayatri/nammayatri: Delivered critical payment correctness fix, performance monitoring enhancements for multimodal flows, and vehicle-type based pricing flexibility. These changes improve payment reliability, observability, and pricing adaptability, driving better user experience and operational efficiency.

June 2026

11 Commits • 6 Features

Jun 1, 2026

June 2026: Delivered cross-repo enhancements focused on analytics efficiency, flexible payment processing, and reliability across shared-kernel and nammayatri. Key changes include a new sliding window decrement function for time-bucket counters, Juspay data/config improvements, and support for user-defined data in order and payment requests. In nammayatri, enhanced order customization through udf1, reinforced FRFS reliability with onInit basket construction and simplified payment status checks, and introduced broader data customization for orders. These efforts improve data accuracy, client configurability, and system reliability across payment flows, supporting faster go-to-market for client integrations and reducing operational risk.

May 2026

6 Commits • 5 Features

May 1, 2026

May 2026 monthly work summary focused on delivering features across shared-kernel and nammayatri, with emphasis on settlement reliability, data processing performance, and rider-financial transparency. Key enhancements include CSV handling improvements for settlement processing, a performance-optimized SlidingWindowCounters, automated settlement ingestion on the rider platform, Juspay webhook enhancements for multi-transaction support, and a new rider monthly expense data API. All changes improved reliability, observability, and business value through better data enrichment, error handling, and automation.

April 2026

10 Commits • 8 Features

Apr 1, 2026

April 2026 performance summary for NamMayatri projects, focusing on delivering visibility, reconciliation, and payment integrity across two repositories (nammayatri/nammayatri and nammayatri/shared-kernel). Delivered a set of features and data-model improvements to strengthen operational efficiency and business value. Highlights include ETA data monitoring, payout data model flexibility, enhanced payout settlement reporting, Loyalty API, wallet session API and ledger, and multi-source settlement ingestion initiatives, all contributing to improved traceability, auditability, and customer experience.

March 2026

2 Commits • 2 Features

Mar 1, 2026

In March 2026, two key features were delivered in nammayatri/nammayatri to improve performance observability and payment transaction tracking. Added latency logging for bus API manifest endpoints to enhance monitoring and SLAs, and integrated purchasedPassPayment ID into getMultimodalPassTransactions to enable end-to-end payment traceability. No major bugs fixed in this period. Overall impact: improved performance visibility, faster issue triage, and stronger payment reconciliation, contributing to better reliability and user experience. Technologies demonstrated: API instrumentation, logging/metrics (latency logs), data model augmentation for transactions, and enhanced traceability.

February 2026

11 Commits • 6 Features

Feb 1, 2026

February 2026 (2026-02) delivered a cohesive set of API-driven enhancements, data-model refinements, and instrumentation across the NamMayatri platform to boost reliability, scalability, and operational visibility. Key outcomes include stronger alert incident management with RCA-enabled metadata, optimized FRFS daily API and booking flows, richer daily metrics reporting, tailored multimodal routing, and a refactored live vehicle timings API. Added latency instrumentation around route serviceability to enable data-driven performance improvements. These changes reduce incident resolution time, improve booking reliability, and enhance decision-making for operations and product teams.

January 2026

2 Commits • 1 Features

Jan 1, 2026

Month: 2026-01. Focused on delivering real-time operational visibility and improving fare accuracy. Key outcomes include a new Live Metrics API for FRFS alerts dashboard and a targeted bug fix that corrects fare quote determination by ticket type for return journeys. Repository nammayatri/nammayatri remains the primary driver for these changes, aligning engineering efforts with business value of accurate pricing and proactive monitoring.

December 2025

8 Commits • 2 Features

Dec 1, 2025

December 2025: Strengthened ticketing accuracy, routing fidelity, and multimodal search controls for nammayatri/nammayatri. Delivered Train Type Aware Quotes and Routing, enhanced data models for trainType differentiation, and improved booking reliability by sourcing ticketType directly from quotes. Implemented selective service tier filtering in timetable and route fare calculations, and stabilized suburban routing logic.

November 2025

1 Commits • 1 Features

Nov 1, 2025

November 2025 monthly summary for the nammayatri project highlighting focused backend delivery and performance improvements in metrics capabilities.

October 2025

3 Commits • 2 Features

Oct 1, 2025

October 2025 Monthly Summary — nammayatri/nammayatri Overview: Delivered key data-collection enhancements and real-time streaming capabilities, while safeguarding data integrity by pausing an automatic fleet-number finalization workflow during rider-tracking. These changes strengthen analytics, observability, and responsiveness for operations and product teams.

July 2025

1 Commits • 1 Features

Jul 1, 2025

Month: 2025-07 | Repository: nammayatri/nammayatri. Delivered granular sub-leg status updates for Metro and Subway journeys by introducing a subLegOrder parameter and refactoring related backend functions. This enables per-leg progress tracking within multi-leg journeys and ensures the main booking status reflects completion only after all sub-legs are finished. The change is backed by a focused commit and lays groundwork for enhanced analytics and customer-facing journey visibility. Impact includes stronger data integrity, clearer ownership of journey state, and smoother future feature expansion for other modes.

June 2025

3 Commits • 2 Features

Jun 1, 2025

June 2025: Reliability, data, and traceability improvements for nammayatri/nammayatri. Delivered a booking race-condition fix, introduced Fare Feedback API, and extended leg data with ticket numbers to improve end-to-end trip visibility and user experience. These changes reduce booking failures near expiration, enable user feedback on fares, and enhance analytics and reconciliation across transport modes.

Activity

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Quality Metrics

Correctness86.4%
Maintainability81.2%
Architecture81.6%
Performance82.2%
AI Usage29.0%

Skills & Technologies

Programming Languages

HaskellSQLYAML

Technical Skills

API DesignAPI DevelopmentAPI designAPI developmentAPI integrationBackend DevelopmentBeam frameworkBug FixingData ModelingDatabase ManagementDatabase Schema DesignGraphQLHaskellHaskell programmingKafka

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

nammayatri/nammayatri

Jun 2025 Jul 2026
12 Months active

Languages Used

HaskellSQLYAML

Technical Skills

API DesignBackend DevelopmentBug FixingDatabase ManagementHaskellData Modeling

nammayatri/shared-kernel

Apr 2026 Jun 2026
3 Months active

Languages Used

Haskell

Technical Skills

API integrationHaskellbackend developmentdata parsingRedisfunctional programming