supabase/auth
Dec 2025 – Jan 2026
2 Months active
Languages Used
Go
Technical Skills
API developmentbackend developmentmiddleware designrate limitingtestingmetrics instrumentation
John Schaeffer
PROFILE
John Schaeffer
John Schaeffer contributed to the supabase/auth repository by building and refining backend features focused on security, observability, and reliability. He implemented middleware in Go to support config-controlled IP forwarding and accurate rate limiting, ensuring correct end-user IP extraction in proxy-heavy environments. John enhanced metrics instrumentation using OpenTelemetry, introducing granular route-level HTTP metrics and detailed email delivery tracking to improve troubleshooting and SLA monitoring. He addressed inconsistencies in IP logging by standardizing extraction logic, aligning with Sb-Forwarded-For headers for robust audit trails. His work demonstrated depth in API development, middleware design, and telemetry-driven observability, resulting in more maintainable authentication infrastructure.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
5Total
Bugs
2
Commits
5
Features
3
Lines of code
919
Activity Months2
Your Network
45 peopleWork History
January 2026
3 Commits • 2 Features
Jan 1, 2026January 2026 — Supabase Auth repository (supabase/auth) Overview: Focused on strengthening observability, reliability, and per-route visibility in authentication flows and HTTP server metrics. Delivered metrics instrumentation, consistent IP logging across code paths, and per-route metrics naming with a dependency upgrade to improve metric fidelity and troubleshooting speed. Key features delivered: - User Authentication System: Email delivery metrics — introduced observability for email send operations and errors to decouple email delivery visibility from API handlers. Implemented metrics: gotrue_email_send_operations_counter_total and gotrue_email_send_errors_counter_total. Commit: 00965758762301875df2d7e4e552b2346bc09236. - HTTP Server Metrics: Route-level metrics and dependency upgrade — added http_route label for granular route metrics and upgraded otelhttp for clearer metric naming; updated naming to http_server_request_duration_seconds_bucket and introduced per-route labeling. Commit: 0e384b8b1e7d1eb985740a96b8b4e8c0ed7ffe1c. - User Authentication System: IP address logging accuracy — fixed IP extraction to rely on a standard utility (GetIPAddress) and respect Sb-Forwarded-For configuration, replacing RemoteAddr usage for consistent auditing/logging. Commit: 1ae3a3dcad766a3989f86a37c347b9e3806c14dc. Major bugs fixed: - IP address tracking inconsistencies across Auth data paths — ensured correct IP handling in request/audit logs by honoring Sb-Forwarded-For headers and standardizing IP extraction. (Commit: 1ae3a3dcad766a3989f86a37c347b9e3806c14dc) Overall impact and accomplishments: - Enhanced observability: More accurate email delivery metrics and per-route HTTP metrics enable faster issue diagnosis and better capacity planning. - Improved reliability and compliance: Consistent IP logging improves audit trails and security monitoring. - Performance/metric hygiene: Upgraded telemetry stack (otelhttp) and aligned metric naming conventions for clearer dashboards and SLA reporting. Technologies/skills demonstrated: - OpenTelemetry instrumentation and metrics naming conventions - Telemetry-driven observability for email delivery and HTTP server routes - Dependency upgrades for telemetry tooling (otelhttp v0.63.0) - Robust IP extraction and request logging patterns (GetIPAddress, Sb-Forwarded-For handling) Business value: - Reduced MTTR through precise route-level metrics and reliable email delivery observability - Clearer SLA tracking and auditing capabilities with consistent IP logs
3 Commits • 2 Features
Jan 1, 2026January 2026 — Supabase Auth repository (supabase/auth) Overview: Focused on strengthening observability, reliability, and per-route visibility in authentication flows and HTTP server metrics. Delivered metrics instrumentation, consistent IP logging across code paths, and per-route metrics naming with a dependency upgrade to improve metric fidelity and troubleshooting speed. Key features delivered: - User Authentication System: Email delivery metrics — introduced observability for email send operations and errors to decouple email delivery visibility from API handlers. Implemented metrics: gotrue_email_send_operations_counter_total and gotrue_email_send_errors_counter_total. Commit: 00965758762301875df2d7e4e552b2346bc09236. - HTTP Server Metrics: Route-level metrics and dependency upgrade — added http_route label for granular route metrics and upgraded otelhttp for clearer metric naming; updated naming to http_server_request_duration_seconds_bucket and introduced per-route labeling. Commit: 0e384b8b1e7d1eb985740a96b8b4e8c0ed7ffe1c. - User Authentication System: IP address logging accuracy — fixed IP extraction to rely on a standard utility (GetIPAddress) and respect Sb-Forwarded-For configuration, replacing RemoteAddr usage for consistent auditing/logging. Commit: 1ae3a3dcad766a3989f86a37c347b9e3806c14dc. Major bugs fixed: - IP address tracking inconsistencies across Auth data paths — ensured correct IP handling in request/audit logs by honoring Sb-Forwarded-For headers and standardizing IP extraction. (Commit: 1ae3a3dcad766a3989f86a37c347b9e3806c14dc) Overall impact and accomplishments: - Enhanced observability: More accurate email delivery metrics and per-route HTTP metrics enable faster issue diagnosis and better capacity planning. - Improved reliability and compliance: Consistent IP logging improves audit trails and security monitoring. - Performance/metric hygiene: Upgraded telemetry stack (otelhttp) and aligned metric naming conventions for clearer dashboards and SLA reporting. Technologies/skills demonstrated: - OpenTelemetry instrumentation and metrics naming conventions - Telemetry-driven observability for email delivery and HTTP server routes - Dependency upgrades for telemetry tooling (otelhttp v0.63.0) - Robust IP extraction and request logging patterns (GetIPAddress, Sb-Forwarded-For handling) Business value: - Reduced MTTR through precise route-level metrics and reliable email delivery observability - Clearer SLA tracking and auditing capabilities with consistent IP logs
January 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025: Auth team delivered targeted IP handling and rate-limiting improvements to boost security, accuracy, and reliability in proxy-heavy environments. The work focused on aligning end-user IP extraction with real-world traffic, reducing misapplied rate limits, and preserving backward compatibility when features are disabled. Key outcomes include the introduction of config-controlled IP forwarding via Sb-Forwarded-For and a corrected rate-limiting header processing path that respects RFC-like header semantics.
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025: Auth team delivered targeted IP handling and rate-limiting improvements to boost security, accuracy, and reliability in proxy-heavy environments. The work focused on aligning end-user IP extraction with real-world traffic, reducing misapplied rate limits, and preserving backward compatibility when features are disabled. Key outcomes include the introduction of config-controlled IP forwarding via Sb-Forwarded-For and a corrected rate-limiting header processing path that respects RFC-like header semantics.
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture84.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Go
Technical Skills
API developmentbackend developmentmetrics instrumentationmetrics trackingmiddleware designmiddleware managementobservabilityrate limitingtesting
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