
Marek Kaput engineered core language tooling and infrastructure for the software-mansion/cairols and software-mansion/scarb repositories, focusing on robust code navigation, diagnostics, and extensible oracle integration. He delivered features such as trait-aware symbol resolution, end-to-end testing for language server protocols, and a dependency tree visualization CLI, using Rust and Cairo. Marek refactored diagnostics for multithreaded performance, modernized test automation, and introduced WASM and shell-based oracle protocols to streamline external integrations. His work emphasized maintainability, reliability, and developer experience, with deep attention to CI/CD, dependency management, and documentation, resulting in stable, scalable systems that accelerate feature delivery and reduce maintenance overhead.

Month: 2025-10 — This period delivered core features for the scarb Oracle infrastructure, reinforced release readiness, and improved code quality. The work focused on enhancing oracle data handling, ensuring state persistence, and documenting APIs to accelerate adoption and reliability. In parallel, the team performed targeted refactors and performance optimizations to reduce maintenance overhead and prepare for upcoming releases.
Month: 2025-10 — This period delivered core features for the scarb Oracle infrastructure, reinforced release readiness, and improved code quality. The work focused on enhancing oracle data handling, ensuring state persistence, and documenting APIs to accelerate adoption and reliability. In parallel, the team performed targeted refactors and performance optimizations to reduce maintenance overhead and prepare for upcoming releases.
September 2025 highlights for software-mansion/scarb: Implemented core oracle capabilities (shell) enabling execution of shell commands with exit codes and outputs, plus improved command handling for testing harnesses. Added WASM-based oracle integration (module loading/invocation, function name disambiguation) with end-to-end tests and a feature toggle to disable the protocol until fully implemented. Introduced experimental TestHintProcessor for cairo-test oracle support and reorganized scarb-execute tests for maintainability. Extended build and source capabilities with binary source support in ProjectBuilder and an assets field in Scarb.toml to declare/copy additional files during builds (with tests for dependencies and error cases). Completed maintenance and dependency upgrades including Cairo bumped to 2.12.1 and related lint/cleanup improvements. Overall, these efforts improve testability, reliability, and maintainability while expanding oracle capabilities and asset/binary handling to deliver greater business value.
September 2025 highlights for software-mansion/scarb: Implemented core oracle capabilities (shell) enabling execution of shell commands with exit codes and outputs, plus improved command handling for testing harnesses. Added WASM-based oracle integration (module loading/invocation, function name disambiguation) with end-to-end tests and a feature toggle to disable the protocol until fully implemented. Introduced experimental TestHintProcessor for cairo-test oracle support and reorganized scarb-execute tests for maintainability. Extended build and source capabilities with binary source support in ProjectBuilder and an assets field in Scarb.toml to declare/copy additional files during builds (with tests for dependencies and error cases). Completed maintenance and dependency upgrades including Cairo bumped to 2.12.1 and related lint/cleanup improvements. Overall, these efforts improve testability, reliability, and maintainability while expanding oracle capabilities and asset/binary handling to deliver greater business value.
August 2025 monthly summary highlighting key features and fixes across scarb and starknet-foundry, focused on business value, stability, extensibility, and testability. Major achievements include dependency/upgrades for Rust 1.89 compatibility and Cairo, connection/file handling cleanups, a cohesive HintService architecture and protocol extensibility, and test utilities reorganization in scarb; plus internal refactor of BufferReader and experimental Oracle support integration for snforge in starknet-foundry. Impact: improved stability, future upgrade readiness, test reuse, and expanded oracle capabilities; Technologies demonstrated include Rust, Cargo features, service-oriented architecture, and test harness consolidation.
August 2025 monthly summary highlighting key features and fixes across scarb and starknet-foundry, focused on business value, stability, extensibility, and testability. Major achievements include dependency/upgrades for Rust 1.89 compatibility and Cairo, connection/file handling cleanups, a cohesive HintService architecture and protocol extensibility, and test utilities reorganization in scarb; plus internal refactor of BufferReader and experimental Oracle support integration for snforge in starknet-foundry. Impact: improved stability, future upgrade readiness, test reuse, and expanded oracle capabilities; Technologies demonstrated include Rust, Cargo features, service-oriented architecture, and test harness consolidation.
July 2025 focused on delivering a robust Oracles integration and testing infrastructure for scarb, enhancing the Scarb-execute extension with better parsing and observability, and strengthening CI, tooling, and documentation. The work enables external oracle interaction via a new JSON-RPC pathway, cross-platform test coverage (including Windows), and improved diagnostics, laying the groundwork for reliable oracle-based features and faster developer onboarding.
July 2025 focused on delivering a robust Oracles integration and testing infrastructure for scarb, enhancing the Scarb-execute extension with better parsing and observability, and strengthening CI, tooling, and documentation. The work enables external oracle interaction via a new JSON-RPC pathway, cross-platform test coverage (including Windows), and improved diagnostics, laying the groundwork for reliable oracle-based features and faster developer onboarding.
June 2025 monthly summary for software-mansion/scarb: Delivered the Scarb Dependency Tree Command to visualize the project's dependency graph with configurable depth, pruning, and inclusion of core dependencies. Implemented CLI parsing for the tree command, core logic to build and render the dependency tree, and end-to-end tests ensuring robustness. This work enables developers to quickly inspect dependency relationships, identify potential version conflicts, and facilitate impact analysis before changes.
June 2025 monthly summary for software-mansion/scarb: Delivered the Scarb Dependency Tree Command to visualize the project's dependency graph with configurable depth, pruning, and inclusion of core dependencies. Implemented CLI parsing for the tree command, core logic to build and render the dependency tree, and end-to-end tests ensuring robustness. This work enables developers to quickly inspect dependency relationships, identify potential version conflicts, and facilitate impact analysis before changes.
April 2025: Delivered targeted feature enhancements and reliability improvements across cairols and scarb, delivering measurable business value through improved code navigation, secure CI workflows, and correct packaging metadata. Key outcomes include trait-aware navigation updates, hardened secrets handling for CI pipelines, and accurate inclusion of development dependencies in published manifests.
April 2025: Delivered targeted feature enhancements and reliability improvements across cairols and scarb, delivering measurable business value through improved code navigation, secure CI workflows, and correct packaging metadata. Key outcomes include trait-aware navigation updates, hardened secrets handling for CI pipelines, and accurate inclusion of development dependencies in published manifests.
March 2025 (software-mansion/cairols) highlights: completed comprehensive dependency upgrades and toolchain modernization across Cairo crates, migrating from git sources to crates.io, and updating Cairo-vm, Scarb tooling, and related lockfiles. Implemented end-to-end tests for constants navigation and hover to increase reliability of the language server. Refactored hover rendering to rely on definition-based rendering, removing legacy logic and aligning with the language server design. These changes boost build stability, developer experience, and cross-team compatibility with the Cairo ecosystem. Business value includes reduced maintenance burden from external dependencies, faster feature delivery, and more accurate editor features for developers.
March 2025 (software-mansion/cairols) highlights: completed comprehensive dependency upgrades and toolchain modernization across Cairo crates, migrating from git sources to crates.io, and updating Cairo-vm, Scarb tooling, and related lockfiles. Implemented end-to-end tests for constants navigation and hover to increase reliability of the language server. Refactored hover rendering to rely on definition-based rendering, removing legacy logic and aligning with the language server design. These changes boost build stability, developer experience, and cross-team compatibility with the Cairo ecosystem. Business value includes reduced maintenance burden from external dependencies, faster feature delivery, and more accurate editor features for developers.
February 2025 monthly summary for software-mansion/cairols focusing on robust code navigation, symbol resolution, and maintainability improvements across the codebase. The month emphasizes delivering precise definition references, enhancing enum variant handling, refactoring for maintainability, and stabilizing tooling and CI to accelerate development and reduce risk.
February 2025 monthly summary for software-mansion/cairols focusing on robust code navigation, symbol resolution, and maintainability improvements across the codebase. The month emphasizes delivering precise definition references, enhancing enum variant handling, refactoring for maintainability, and stabilizing tooling and CI to accelerate development and reduce risk.
January 2025 (2025-01) focused on delivering core editor features, stabilizing references resolution, and modernizing the test and CI infrastructure for cairols. Key feature work included implementing and tightening textDocument/references: scaffolding, collecting declarations, performing usages search, inlining macro references, and comprehensive tests. Symbol and Module Definition improvements were completed (SymbolDef::name, storing ExprInlineMacro as SmolStr, and removing module name from ModuleDef). AGoto Definition refactor was carried out for cleaner, maintainable code, complemented by AST utilities and fluent traversal enhancements. Performance and reliability were boosted by scaffolding and narrowing search scopes for variable references. The project also upgraded Cairo dependencies, modernized tests with Insta, and updated CI/workflows for release-branch runs and Slack inputs, enabling faster feedback. Critical bug fixes addressed definition lookups for let bindings and reverted a partial cancel-in-progress feature, along with fixes to module and function definition nodes. Overall, these efforts improve stability, developer productivity, and release confidence while reducing regression risk.
January 2025 (2025-01) focused on delivering core editor features, stabilizing references resolution, and modernizing the test and CI infrastructure for cairols. Key feature work included implementing and tightening textDocument/references: scaffolding, collecting declarations, performing usages search, inlining macro references, and comprehensive tests. Symbol and Module Definition improvements were completed (SymbolDef::name, storing ExprInlineMacro as SmolStr, and removing module name from ModuleDef). AGoto Definition refactor was carried out for cleaner, maintainable code, complemented by AST utilities and fluent traversal enhancements. Performance and reliability were boosted by scaffolding and narrowing search scopes for variable references. The project also upgraded Cairo dependencies, modernized tests with Insta, and updated CI/workflows for release-branch runs and Slack inputs, enabling faster feedback. Critical bug fixes addressed definition lookups for let bindings and reverted a partial cancel-in-progress feature, along with fixes to module and function definition nodes. Overall, these efforts improve stability, developer productivity, and release confidence while reducing regression risk.
December 2024 focused on stabilizing and standardizing the Cairo toolchain and improving developer experience across caIrols and scarb. The work delivered centralized toolchain management, CI automation enhancements, and test infrastructure improvements that reduce maintenance burden and accelerate independent updates while ensuring consistent Cairo crate revisions.
December 2024 focused on stabilizing and standardizing the Cairo toolchain and improving developer experience across caIrols and scarb. The work delivered centralized toolchain management, CI automation enhancements, and test infrastructure improvements that reduce maintenance burden and accelerate independent updates while ensuring consistent Cairo crate revisions.
November 2024 performance and reliability sprint for cairols. Delivered a Diagnostics core refactor with significant performance improvements (multithreaded refreshing, batching, URL-only handling to survive db swaps) and updated DiagnosticsController, enabling faster diagnostics with lower latency. Fixed critical background task cancellation and hangs to improve reliability during termination. Consolidated the Cairo Language Server into a single crate for simpler maintenance and faster release cycles. Improved codebase organization, dependencies, and CI hygiene; integrated Scarb for development/testing and updated versioning (2.9.x). Result: faster, more reliable diagnostics; cleaner builds; and a maintainable foundation for future features.
November 2024 performance and reliability sprint for cairols. Delivered a Diagnostics core refactor with significant performance improvements (multithreaded refreshing, batching, URL-only handling to survive db swaps) and updated DiagnosticsController, enabling faster diagnostics with lower latency. Fixed critical background task cancellation and hangs to improve reliability during termination. Consolidated the Cairo Language Server into a single crate for simpler maintenance and faster release cycles. Improved codebase organization, dependencies, and CI hygiene; integrated Scarb for development/testing and updated versioning (2.9.x). Result: faster, more reliable diagnostics; cleaner builds; and a maintainable foundation for future features.
October 2024 monthly summary for software-mansion/cairols: Delivered targeted optimizations to Cairo Language Server Diagnostics, improving performance, robustness, and developer feedback. Focused on reducing unnecessary work and handling panics gracefully to minimize noisy errors. This work enhances business value by speeding up diagnostics, cutting CPU usage, and improving reliability in LSP workflows.
October 2024 monthly summary for software-mansion/cairols: Delivered targeted optimizations to Cairo Language Server Diagnostics, improving performance, robustness, and developer feedback. Focused on reducing unnecessary work and handling panics gracefully to minimize noisy errors. This work enhances business value by speeding up diagnostics, cutting CPU usage, and improving reliability in LSP workflows.
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