nau/scalus
Sep 2025 – Dec 2025
4 Months active
Languages Used
JavaMarkdownPropertiesScalaYAMLJavaScript
Technical Skills
API IntegrationBackend DevelopmentBlockchainBlockchain DevelopmentBuild Tool ConfigurationCBOR
Sergiy Shcherbyna
PROFILE
Sergiy Shcherbyna
Over four months, contributed to the nau/scalus repository by delivering 42 features and resolving 24 bugs focused on Cardano blockchain development. Built and enhanced core modules for asset transfers, Plutus Core builtins, and CBOR data handling, emphasizing reliability and protocol conformance. Applied Scala and Java to implement macro-based resource management, optimize transaction validation, and expand test coverage with integration and conformance tests. Improved CI/CD workflows using GitHub Actions, streamlined onboarding through documentation updates, and strengthened data serialization and validation logic. The work resulted in more robust ledger validation, deterministic builds, and safer deployments, supporting future scalability and maintainability.
Overall Statistics
Feature vs Bugs
64%Features
Repository Contributions
178Total
Bugs
24
Commits
178
Features
42
Lines of code
46,671,100
Activity Months4
Work History
December 2025
41 Commits • 8 Features
Dec 1, 2025December 2025: Delivered core Plutus Core builtins enhancements and expanded validation and testing coverage for Scalus, driving reliability and business value. Implemented CIP-0138 Builtin Type Array with Generator, CIP-0156 Builtin Function (including multiIndexArray), fixed critical collateral handling bugs, and strengthened conformance testing and documentation. Results: more robust ledger validation, reduced risk in deployments, and clearer API/docs for downstream teams.
41 Commits • 8 Features
Dec 1, 2025December 2025: Delivered core Plutus Core builtins enhancements and expanded validation and testing coverage for Scalus, driving reliability and business value. Implemented CIP-0138 Builtin Type Array with Generator, CIP-0156 Builtin Function (including multiIndexArray), fixed critical collateral handling bugs, and strengthened conformance testing and documentation. Results: more robust ledger validation, reduced risk in deployments, and clearer API/docs for downstream teams.
December 2025
November 2025
34 Commits • 13 Features
Nov 1, 2025November 2025: Focused on feature delivery for scalable data handling, conformance readiness, and robustness. The team shipped core data-structure support, hardened CBOR decoding, and expanded conformance test coverage, delivering measurable business value through improved reliability, faster validation, and clearer protocol parameter handling.
November 2025
34 Commits • 13 Features
Nov 1, 2025November 2025: Focused on feature delivery for scalable data handling, conformance readiness, and robustness. The team shipped core data-structure support, hardened CBOR decoding, and expanded conformance test coverage, delivering measurable business value through improved reliability, faster validation, and clearer protocol parameter handling.
October 2025
34 Commits • 8 Features
Oct 1, 2025Month: 2025-10 Summary: Focused on reliability, correctness, and test quality for nau/scalus. Delivered stability improvements in BlocksValidation, fixes to data encoding paths, and expanded test coverage, reducing diagnostic noise and increasing CI confidence. These efforts establish a stronger foundation for future feature delivery and performance work, with measurable business value in fewer runtime validation failures, more deterministic builds, and faster, safer deployments.
34 Commits • 8 Features
Oct 1, 2025Month: 2025-10 Summary: Focused on reliability, correctness, and test quality for nau/scalus. Delivered stability improvements in BlocksValidation, fixes to data encoding paths, and expanded test coverage, reducing diagnostic noise and increasing CI confidence. These efforts establish a stronger foundation for future feature delivery and performance work, with measurable business value in fewer runtime validation failures, more deterministic builds, and faster, safer deployments.
October 2025
September 2025
69 Commits • 13 Features
Sep 1, 2025Month: 2025-09 Overview: This month delivered core business capabilities around asset transfers, macro-based resource handling, and strengthened testing/CI infrastructure, with a focus on reliability, contributor experience, and security. Sections: - Key features delivered: • Documentation Update: CONTRIBUTING.md updated to address libblst issue and improve contributor guidelines. • Macro System Enhancements: resource inlining — added and refined macros for sourcesRoot handling, readResource, inlineResource, and resource path checks to improve build reliability. • Smart Module: SimpleTransfer implementation with basic code, unit test scaffolding, and early validation (native token support, contract input/output checks, negative amount validation). • Simple Transfer feature: end-to-end implementation and testing, including native token support and negative amount validation. • CI/Testing enhancements: fail-fast configuration across CI strategies; GitHub Actions for IT tests; IT noise reduction; improved cron scheduling and IT test environment simplifications (disable testcontainers for IT). • Testing infrastructure improvements: BlocksValidation/test relocation, testing data relocation for isolation, CachedEpochParamsSupplier optimization, and Yaci testcontainer usage. - Major bugs fixed: • WrongNetworkValidator and related rules: implemented and tested cross-network validators (WrongNetworkInTxBodyValidator, WrongNetworkWithdrawalValidator, WrongNetworkValidator) with related CardanoMutator adjustments. • IT test data and runtime fixes: Bad datum from block 11545396; Cron scheduling fix; Bloxbean WitnessUtil test problem; test stability for ValidateBlocksOfEpochWithScalus and CborTest. - Overall impact and business value: • Reduced onboarding friction and increased contributor throughput with improved guidelines. • Higher reliability and faster feedback loops in CI, leading to quicker issue resolution and more stable releases. • Strengthened asset transfer capabilities with validated transfer logic and native token support, backed by robust tests. • Improved testing isolation and coverage, enabling safer refactors and future feature work. - Technologies demonstrated: • Scala/macros (resource inlining, sourcesRoot, readResource, inlineResource), Smart Module development, unit/integration testing, CI automation (GitHub Actions), testcontainers usage, and validator logic for cross-network validation.
September 2025
69 Commits • 13 Features
Sep 1, 2025Month: 2025-09 Overview: This month delivered core business capabilities around asset transfers, macro-based resource handling, and strengthened testing/CI infrastructure, with a focus on reliability, contributor experience, and security. Sections: - Key features delivered: • Documentation Update: CONTRIBUTING.md updated to address libblst issue and improve contributor guidelines. • Macro System Enhancements: resource inlining — added and refined macros for sourcesRoot handling, readResource, inlineResource, and resource path checks to improve build reliability. • Smart Module: SimpleTransfer implementation with basic code, unit test scaffolding, and early validation (native token support, contract input/output checks, negative amount validation). • Simple Transfer feature: end-to-end implementation and testing, including native token support and negative amount validation. • CI/Testing enhancements: fail-fast configuration across CI strategies; GitHub Actions for IT tests; IT noise reduction; improved cron scheduling and IT test environment simplifications (disable testcontainers for IT). • Testing infrastructure improvements: BlocksValidation/test relocation, testing data relocation for isolation, CachedEpochParamsSupplier optimization, and Yaci testcontainer usage. - Major bugs fixed: • WrongNetworkValidator and related rules: implemented and tested cross-network validators (WrongNetworkInTxBodyValidator, WrongNetworkWithdrawalValidator, WrongNetworkValidator) with related CardanoMutator adjustments. • IT test data and runtime fixes: Bad datum from block 11545396; Cron scheduling fix; Bloxbean WitnessUtil test problem; test stability for ValidateBlocksOfEpochWithScalus and CborTest. - Overall impact and business value: • Reduced onboarding friction and increased contributor throughput with improved guidelines. • Higher reliability and faster feedback loops in CI, leading to quicker issue resolution and more stable releases. • Strengthened asset transfer capabilities with validated transfer logic and native token support, backed by robust tests. • Improved testing isolation and coverage, enabling safer refactors and future feature work. - Technologies demonstrated: • Scala/macros (resource inlining, sourcesRoot, readResource, inlineResource), Smart Module development, unit/integration testing, CI automation (GitHub Actions), testcontainers usage, and validator logic for cross-network validation.
Activity
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Quality Metrics
Correctness87.2%
Maintainability84.4%
Architecture81.6%
Performance79.0%
AI Usage23.0%
Skills & Technologies
Programming Languages
JavaJavaScriptMarkdownPropertiesScalaYAML
Technical Skills
API IntegrationBackend DevelopmentBlockchainBlockchain DevelopmentBuild Tool ConfigurationBuild ToolingCBORCBOR encoding/decodingCBOR handlingCBOR parsingCI/CDCachingCardanoCardano DevelopmentCardano Ledger
Repositories Contributed To
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