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I was a Google Summer of Code 2025 contributor with the Open Transit Software Foundation (OTSF), contributing to OneBusAway by developing a Go-based monitoring service that delivers accurate and timely transit data. It continuously tracks system health, data quality, and resource usage, and exposes a wide range of Prometheus metrics.
Here’s a wrap-up report with more details about the project: Final report. Below is the list of my contributions:
| Repository | Description | Type | PR / Issue | Status |
|---|---|---|---|---|
| OneBusAway/watchdog | A total of 28 PRs were reviewed and merged. | All PRs | ||
| ↳ | Added hybrid geo-clustering for unmatched GTFS stops using GTFS hierarchy and S2 cells to expose stable, low-cardinality Prometheus metrics. | Feature/Enh. | PR #71 | Merged |
| ↳ | Reduced memory usage by introducing lightweight GTFS data models and implemented cached Prometheus handler to avoid redundant serialization on scrapes. | Perf/Infra | PR #82 |
Merged |
| ↳ | Implemented exponential backoff with jitter for retries and HTTP requests, added BackoffStore with per-server tracking to avoid overlapping goroutines, and refactored GTFS handling for resilient metrics collection. | Perf/Infra | PR #83 |
Merged |
| ↳ | Enabled connection pooling with a shared http.Client, introduced thread-safe RealtimeStore for GTFS-RT data reuse, centralized fetch-and-parse logic, and added Prometheus metrics for external API latency and memory usage. | Feature/Enh. | PR #77 | Merged |
| ↳ | Added Docker Compose setup with Watchdog, Prometheus, and Grafana, including Prometheus scrape config, Grafana datasource provisioning, and persistent dashboard support. | Infra/Deploy | PR #81 |
Merged |
| ↳ | Resolved all gosec findings, added security-related HTTP headers, and verified application security with OWASP ZAP scans showing no remaining vulnerabilities. | Security/Infra | PR #84 |
Merged |
| ↳ | Refactored GTFS handling to use an in-memory StaticStore instead of disk caching, eliminating redundant file I/O, improving performance, and simplifying data access across the application. | Feature/Enh. | PR #78 | Merged |
| ↳ | Added comprehensive API and metrics interpretation documentation, updated README with setup/usage details, contributing guidelines, Code of Conduct, and refactored integration config docs. | Docs/Infra | PR #79, PR #85 |
Merged |
| ↳ | Validated GTFS-RT vehicle coordinates using bounding boxes from static GTFS data, reporting out-of-bounds stopped vehicles via Prometheus for improved accuracy and observability. | Feature/Enh |
PR #73 | Merged |
| ↳ | Tracked GTFS-RT vehicle reporting frequency using Prometheus metrics for total reports and reporting intervals per vehicle. | Feature/Enh |
PR #70 | Merged |
| ↳ | Exposed unmatched stop locations from GTFS static data as Prometheus metrics and added utilities for mapping stop IDs to coordinates. | Feature/Enh |
PR #69 | Merged |
| ↳ | Added Prometheus metrics for TripMatchRatio and StopMatchRatio to analyze GTFS-RT and static data alignment across servers and agencies. |
Feature/Enh |
PR #68 | Merged |
| ↳ | Added integration testing support for GTFS bundle downloads and OBA API availability with configurable test flags, shared config loading, and updated README instructions. | Test/Infra |
PR #66,PR #67 |
Merged |
| ↳ | Updated healthcheck endpoint to return detailed JSON response with status, environment, version, servers, and readiness info. | Feature/Enh |
PR #65 |
Merged |
| ↳ | Integrated structured Sentry error reporting across the application with scoped context, unified helper options, middleware wrapping, and enhanced metrics error tracking for improved observability and debugging. | Observability/Enh |
PR #63,PR #62,PR #61,PR #60 | Merged |
| ↳ | Adopted a Service Layer pattern, reorganized the codebase into internal packages, added thread-safe config access, and unified GTFS parsing and real-time fetching. | Refactor/Infra |
PR #80,PR #75,PR #64,PR #72 | Merged |
| ↳ | Improved configuration and Docker usage documentation by renaming config.json to config.json.template, updating .gitignore, and enhancing README with clear setup instructions and usage examples. |
Refactor/Infra |
PR #59 | Merged |
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Open Transit Software Foundation - OneBusAway
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OneBusAway-Application-Modules: Extended the Java-based Metrics API with new metrics to support the standalone Watchdog service.
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Watchdog: Improved Go-based backend testing by refactoring core logic and relocating unit tests to enhance modularity and raise test coverage to 74%.
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Invesalius3: Implemented a base solution for progress bar functionality and applied it to the File/Save operation.
| Repository | Description | Type | PR / Issue | Status |
|---|---|---|---|---|
| InVesalius3 | Implemented a reusable progress bar for file operations in InVesalius, enhancing Save Project functionality with real-time updates using Python, wxPython, and PubSub. | GUI/Enh. | PR #735, Issue #707 | Merged |
| OneBusAway-Application-Modules | Implemented per-agency matched trip count in the Metrics API using Java. | Feature/Enh. | PR #415, Issue #401 | Merged |
| ↳ | Added total real-time records metric per agency in the Metrics API using Java. | Feature/Enh. | PR #421, Issue #400 | Merged |
| OneBusAway/watchdog | Migrated and added unit tests using Go to improve metrics package coverage. | Test/Enh. | PR #46, Issue #45, Issue #47 | Merged |
| ↳ | Refactored main logic into testable helpers using Go and added unit tests. | Refactor+Test/Enh |
PR #53, Issue #45 | Merged |
- Gitlet: Built a Java-based distributed version control system implementing core Git functionalities with persistence and data integrity.
- httpServe: Built an HTTP server in Go, incorporating custom APIs, middleware, and database integration using the standard library.
- Automotive E-commerce Platform: Created a full-featured ASP.NET website for automotive product shopping, trader management, and car inventory handling.
- Pathfinding Algorithm Visualizer: Developed a JavaScript tool for visualizing BFS, DFS, and Dijkstra's algorithms.
