effekt-lang/effekt
Jan 2025 – Feb 2026
6 Months active
Languages Used
CEffektJavaScriptLLVM IRScalaYAML
Technical Skills
Backend DevelopmentCompiler DevelopmentLLVMLanguage ImplementationTestingBuild Systems
Mattis Böckle
PROFILE
Mattis Böckle
Mattis Derbock contributed to the effekt-lang/effekt repository by developing and refining core compiler features over six months, focusing on backend enhancements, language parsing, and type system improvements. He implemented math intrinsics and optimized data structures in the LLVM backend using C and LLVM IR, improving performance and code size. Mattis enhanced the parser to support generic constructors and trailing commas, and introduced automated show method synthesis for user-defined types in Scala. His work addressed bugs in character handling and extern type tracking, demonstrating depth in compiler development, functional programming, and low-level optimization, resulting in a more robust and maintainable codebase.
Overall Statistics
Feature vs Bugs
56%Features
Repository Contributions
10Total
Bugs
4
Commits
10
Features
5
Lines of code
1,349
Activity Months6
Work History
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for effekt-lang/effekt Key features delivered - Show method synthesis for user-defined types: Added a new Core -> Core phase that synthesizes show definitions for types based on ground show definitions, enabling string representations for debugging and logging. Example: generating show for MaybeInt. Major bugs fixed - Accurate extern type handling in Core transformation: Preserved information about extern data types during Core transformation to support downstream phases like Monomorphization, improving type handling correctness. Overall impact and accomplishments - Improved debugging, reduced boilerplate, and stronger type correctness across Core transformations, enabling safer downstream optimizations and easier maintenance. Technologies/skills demonstrated - Compiler engineering: Core transformation phases, type handling, and code generation for show methods. - Extern type tracking and Monomorphization readiness. - Collaboration and documentation through co-authored commits.
2 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for effekt-lang/effekt Key features delivered - Show method synthesis for user-defined types: Added a new Core -> Core phase that synthesizes show definitions for types based on ground show definitions, enabling string representations for debugging and logging. Example: generating show for MaybeInt. Major bugs fixed - Accurate extern type handling in Core transformation: Preserved information about extern data types during Core transformation to support downstream phases like Monomorphization, improving type handling correctness. Overall impact and accomplishments - Improved debugging, reduced boilerplate, and stronger type correctness across Core transformations, enabling safer downstream optimizations and easier maintenance. Technologies/skills demonstrated - Compiler engineering: Core transformation phases, type handling, and code generation for show methods. - Extern type tracking and Monomorphization readiness. - Collaboration and documentation through co-authored commits.
February 2026
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08 focused on Effekt-lang/effekt. Delivered a core language parser enhancement: adding support for type parameters (tparams) in constructors. This enables generic constructors, aligning the language with existing generic patterns and improving code reuse. Implemented parsing changes to capture tparams in constructor definitions and added a dedicated test verifying type inference for a parameterized constructor. Commit reference: 319039ce02f7fa08cdb0bca17f9cfc4252d2cd0b (Add tparams to constructors (#1104)).
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08 focused on Effekt-lang/effekt. Delivered a core language parser enhancement: adding support for type parameters (tparams) in constructors. This enables generic constructors, aligning the language with existing generic patterns and improving code reuse. Implemented parsing changes to capture tparams in constructor definitions and added a dedicated test verifying type inference for a parameterized constructor. Commit reference: 319039ce02f7fa08cdb0bca17f9cfc4252d2cd0b (Add tparams to constructors (#1104)).
July 2025
1 Commits
Jul 1, 2025Month: 2025-07 — Focused on correctness of Char handling in Effekt and expanding test coverage. Delivered a bug fix for the Char default value and added tests to ensure long-term correctness. The change is tracked in effekt-lang/effekt with a clear commit, enabling reliable numeric/character semantics for downstream code and libraries.
1 Commits
Jul 1, 2025Month: 2025-07 — Focused on correctness of Char handling in Effekt and expanding test coverage. Delivered a bug fix for the Char default value and added tests to ensure long-term correctness. The change is tracked in effekt-lang/effekt with a clear commit, enabling reliable numeric/character semantics for downstream code and libraries.
July 2025
April 2025
2 Commits • 1 Features
Apr 1, 2025April 2025: Focused on LLVM backend enhancements for Effekt to improve performance and reduce code size. Moved core data structures (Array, ByteArray, Ref) from C to LLVM IR to enable stronger optimization and inlining, and emitted most declared function definitions as private by default to shrink binary size. Updated the LLVM pretty printer and transformer to support the new linkage parameter, and reimplemented supporting C utilities in LLVM to streamline the toolchain. These changes establish a more efficient, maintainable backend with faster execution paths and smaller deployments.
April 2025
2 Commits • 1 Features
Apr 1, 2025April 2025: Focused on LLVM backend enhancements for Effekt to improve performance and reduce code size. Moved core data structures (Array, ByteArray, Ref) from C to LLVM IR to enable stronger optimization and inlining, and emitted most declared function definitions as private by default to shrink binary size. Updated the LLVM pretty printer and transformer to support the new linkage parameter, and reimplemented supporting C utilities in LLVM to streamline the toolchain. These changes establish a more efficient, maintainable backend with faster execution paths and smaller deployments.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 summary for effekt-lang/effekt: Delivered targeted improvements that enhance language usability and CI reliability, driving developer productivity and more predictable builds. Key work includes a feature enhancement for list literal parsing and a CI stability fix, with expanded tests to cover new syntax edge cases and reduce regressions. Repository: effekt-lang/effekt.
2 Commits • 1 Features
Mar 1, 2025March 2025 summary for effekt-lang/effekt: Delivered targeted improvements that enhance language usability and CI reliability, driving developer productivity and more predictable builds. Key work includes a feature enhancement for list literal parsing and a CI stability fix, with expanded tests to cover new syntax edge cases and reduce regressions. Repository: effekt-lang/effekt.
March 2025
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025 — The Effekt LLVM backend received a focused set of capabilities and robustness improvements, delivering business value through enhanced numeric support and reliable data handling. The work reduced friction for users implementing math-heavy code and ensured correct ordering semantics for binary data, positioning the platform for broader adoption and future feature growth.
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025 — The Effekt LLVM backend received a focused set of capabilities and robustness improvements, delivering business value through enhanced numeric support and reliable data handling. The work reduced friction for users implementing math-heavy code and ensured correct ordering semantics for binary data, positioning the platform for broader adoption and future feature growth.
Activity
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Quality Metrics
Correctness93.0%
Maintainability88.0%
Architecture89.0%
Performance84.0%
AI Usage24.0%
Skills & Technologies
Programming Languages
CEffektJavaScriptLLVM IRScalaYAML
Technical Skills
Backend DevelopmentBuild SystemsCI/CDCode GenerationCompiler DevelopmentCompiler ToolchainsLLVMLLVM IRLanguage DesignLanguage ImplementationLow-Level OptimizationMemory ManagementParser DevelopmentParsingScala
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