apollographql/router
Nov 2024 – Oct 2025
10 Months active
Languages Used
MarkdownRustPythonYAMLGraphQLJavaScriptSQLTOML
Technical Skills
API DevelopmentAsynchronous ProgrammingBackend DevelopmentConcurrencyDocumentationGraphQL
Simon Sapin
PROFILE
Simon Sapin
Simon contributed to the apollographql/router repository by engineering robust backend features and performance improvements over ten months. He built and integrated a resolver-based execution engine, modernized the query planner in Rust, and introduced Redis-backed caching plugins to enhance scalability and reliability. Simon’s work included optimizing thread pools for CPU-bound GraphQL tasks, refining error handling, and implementing cooperative cancellation for query planning. He leveraged Rust, GraphQL, and Redis, focusing on concurrency, system design, and observability. His codebase refactoring, build system upgrades, and comprehensive testing improved maintainability and deployment stability, demonstrating deep technical understanding and a thoughtful, systems-oriented engineering approach.
Overall Statistics
Feature vs Bugs
78%Features
Repository Contributions
48Total
Bugs
7
Commits
48
Features
25
Lines of code
30,350
Activity Months10
Your Network
126 peopleSame Organization
@apollographql.com51
Shared Repositories
75
AaronMember
Andrew McGiveryMember
Andy GarciaMember
Geoffroy CouprieMember
Ben NewmanMember
Coenen BenjaminMember
Benoit 'BoD' LubekMember
Brianna FugateMember
brynMember
Work History
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025: Delivered Execution Engine Refactor and Apollo Router Integration in apollographql/router. Unforked the resolver-based execution engine and wired it through apollo-compiler into the router, removing several internal execution modules and updating the mock subgraphs plugin to use the new engine. The work reduces duplication, simplifies the execution path, and enables cross-component code reuse, setting the stage for faster iteration and easier maintenance. Key commit: 98d14fcb4034abb1f39c8b7b895628c0bfaac110.
1 Commits • 1 Features
Oct 1, 2025October 2025: Delivered Execution Engine Refactor and Apollo Router Integration in apollographql/router. Unforked the resolver-based execution engine and wired it through apollo-compiler into the router, removing several internal execution modules and updating the mock subgraphs plugin to use the new engine. The work reduces duplication, simplifies the execution path, and enables cross-component code reuse, setting the stage for faster iteration and easier maintenance. Key commit: 98d14fcb4034abb1f39c8b7b895628c0bfaac110.
October 2025
July 2025
2 Commits • 1 Features
Jul 1, 2025Concise monthly summary for 2025-07 focusing on delivered features and bug fixes in apollographql/router, highlighting business value and technical achievements.
July 2025
2 Commits • 1 Features
Jul 1, 2025Concise monthly summary for 2025-07 focusing on delivered features and bug fixes in apollographql/router, highlighting business value and technical achievements.
June 2025
4 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for apollographql/router focusing on delivering clear error handling, testing realism, and caching capabilities, while stabilizing the build. Highlights include user-friendly GraphQL variable error reporting, enhanced mock subgraph testing with surrogate keys, an experimental Redis-backed response cache plugin, and a Cargo.lock stability fix. These efforts improve developer experience, testing fidelity, and runtime performance with observable business value.
4 Commits • 3 Features
Jun 1, 2025June 2025 monthly summary for apollographql/router focusing on delivering clear error handling, testing realism, and caching capabilities, while stabilizing the build. Highlights include user-friendly GraphQL variable error reporting, enhanced mock subgraph testing with surrogate keys, an experimental Redis-backed response cache plugin, and a Cargo.lock stability fix. These efforts improve developer experience, testing fidelity, and runtime performance with observable business value.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 – apollographql/router: Delivered machine-readable JSON plan output for the CLI, enabling automation and integration with downstream tooling. No major bugs fixed; stability maintained. This work improves CI/CD interoperability and reduces manual parsing effort.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 – apollographql/router: Delivered machine-readable JSON plan output for the CLI, enabling automation and integration with downstream tooling. No major bugs fixed; stability maintained. This work improves CI/CD interoperability and reduces manual parsing effort.
April 2025
4 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for apollographql/router: Strengthened reliability, observability, and license governance with targeted features and fixes. Implemented Redis-backed Entity Cache Invalidation with end-to-end tests, refined cache deletion logic, and validated behavior across basic caching, non-cached scenarios, and endpoint-based invalidation. Ensured comprehensive JWT telemetry by emitting authentication metrics for all requests and aligning the legacy metric to reflect successful authentications. Reduced operator noise by removing an untriggered startup warning related to telemetry configuration. Aligned license visibility for dependencies (OpenSSL/NCSA) by updating about.toml to match deny.toml.
4 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for apollographql/router: Strengthened reliability, observability, and license governance with targeted features and fixes. Implemented Redis-backed Entity Cache Invalidation with end-to-end tests, refined cache deletion logic, and validated behavior across basic caching, non-cached scenarios, and endpoint-based invalidation. Ensured comprehensive JWT telemetry by emitting authentication metrics for all requests and aligning the legacy metric to reflect successful authentications. Reduced operator noise by removing an untriggered startup warning related to telemetry configuration. Aligned license visibility for dependencies (OpenSSL/NCSA) by updating about.toml to match deny.toml.
April 2025
March 2025
11 Commits • 7 Features
Mar 1, 20252025-03 monthly summary for apollographql/router: delivered core reliability and maintainability improvements across the router, with a focus on concurrency safety, long-term Rust support, and testing. Implemented thread-safe configuration loading and telemetry state management, upgraded the codebase to Rust edition 2024 with formatting standardization, added cooperative cancellation in query planning and execution, extended query plan handling with federation Deserialization, introduced an experimental_mock_subgraphs plugin for testing, and strengthened error handling in compute_job execution. These changes reduce race conditions, improve robustness, speed up CI, and enhance testability and maintainability, delivering measurable business value through more stable deployments and faster iteration cycles.
March 2025
11 Commits • 7 Features
Mar 1, 20252025-03 monthly summary for apollographql/router: delivered core reliability and maintainability improvements across the router, with a focus on concurrency safety, long-term Rust support, and testing. Implemented thread-safe configuration loading and telemetry state management, upgraded the codebase to Rust edition 2024 with formatting standardization, added cooperative cancellation in query planning and execution, extended query plan handling with federation Deserialization, introduced an experimental_mock_subgraphs plugin for testing, and strengthened error handling in compute_job execution. These changes reduce race conditions, improve robustness, speed up CI, and enhance testability and maintainability, delivering measurable business value through more stable deployments and faster iteration cycles.
February 2025
7 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for apollographql/router focusing on delivering robustness, scalability, and release-readiness through targeted performance improvements, API behavior refinements, and documentation/tooling updates.
7 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for apollographql/router focusing on delivering robustness, scalability, and release-readiness through targeted performance improvements, API behavior refinements, and documentation/tooling updates.
February 2025
January 2025
8 Commits • 4 Features
Jan 1, 2025January 2025 performance-focused delivery for apollographql/router. Implemented performance, security, and stability enhancements, modernized dependencies, and optimized resource usage to boost throughput, security posture, and reliability across environments. Key impact includes lower query latency, safer introspection controls, and reduced memory footprint enabling higher concurrency.
January 2025
8 Commits • 4 Features
Jan 1, 2025January 2025 performance-focused delivery for apollographql/router. Implemented performance, security, and stability enhancements, modernized dependencies, and optimized resource usage to boost throughput, security posture, and reliability across environments. Key impact includes lower query latency, safer introspection controls, and reduced memory footprint enabling higher concurrency.
December 2024
6 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for apollographql/router focusing on delivering a cleaner, higher-performance query pipeline, simplified development/build workflows, and stable test coverage post-merge.
6 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for apollographql/router focusing on delivering a cleaner, higher-performance query pipeline, simplified development/build workflows, and stable test coverage post-merge.
December 2024
November 2024
4 Commits • 1 Features
Nov 1, 2024November 2024 performance and reliability enhancements for apollographql/router. Delivered a dedicated compute_jobs thread pool with a priority queue to handle CPU-bound tasks (GraphQL parsing, validation, and query planning); replaced blocking spawn_blocking to reduce contention on async threads; thread pool resizing now utilizes all CPUs and a new metric apollo.router.compute_jobs.queued was added. Also fixed a panic in introspection when introspection is disabled by allowing non-trivial root __typename-only introspection queries to execute without caching. Documentation and changesets updated accordingly to reflect these changes and improve observability.
November 2024
4 Commits • 1 Features
Nov 1, 2024November 2024 performance and reliability enhancements for apollographql/router. Delivered a dedicated compute_jobs thread pool with a priority queue to handle CPU-bound tasks (GraphQL parsing, validation, and query planning); replaced blocking spawn_blocking to reduce contention on async threads; thread pool resizing now utilizes all CPUs and a new metric apollo.router.compute_jobs.queued was added. Also fixed a panic in introspection when introspection is disabled by allowing non-trivial root __typename-only introspection queries to execute without caching. Documentation and changesets updated accordingly to reflect these changes and improve observability.
Activity
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Quality Metrics
Correctness92.2%
Maintainability90.2%
Architecture90.4%
Performance88.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Git ConfigurationGoGraphQLJavaScriptMarkdownPythonRustSQLShellTOML
Technical Skills
API DesignAPI DevelopmentAPI GatewayAPI SecurityApollo FederationAsynchronous ProgrammingBackend DevelopmentBackpressure HandlingBuild AutomationBuild SystemsCI/CDCLI DevelopmentCachingCargoCode Formatting
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