hiero-ledger/hiero-sdk-java
Jan 2025 – Sep 2025
9 Months active
Languages Used
JavaProtoYAMLGroovyKotlinMarkdownProtobufXML
Technical Skills
API DesignObject-Oriented ProgrammingSDK DevelopmentAPI IntegrationAPI RefactoringBlockchain
Nikola Naydenov
PROFILE
Nikola Naydenov
Nikola Naydenov developed and maintained core features for the hiero-ledger/hiero-sdk-java repository, focusing on scalable blockchain SDK capabilities and robust transaction management. Over nine months, he engineered solutions such as custom fee scheduling, atomic batch transactions, and secure HSM-based signing, leveraging Java, Protocol Buffers, and gRPC. His work included modernizing EVM address handling, expanding JSON-RPC endpoints, and integrating Ethereum and Hedera network operations. Nikola emphasized reliability through comprehensive integration testing and release management, ensuring API consistency and data integrity. His technical approach balanced backward compatibility with new features, resulting in a stable, developer-friendly SDK that supports complex distributed systems.
Overall Statistics
Feature vs Bugs
89%Features
Repository Contributions
50Total
Bugs
4
Commits
50
Features
33
Lines of code
16,849
Activity Months9
Your Network
39 people
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025Concise monthly summary for 2025-09 focusing on key deliverables, impact, and technical skills demonstrated in the hiero-sdk-java repository.
1 Commits • 1 Features
Sep 1, 2025Concise monthly summary for 2025-09 focusing on key deliverables, impact, and technical skills demonstrated in the hiero-sdk-java repository.
September 2025
August 2025
3 Commits • 2 Features
Aug 1, 2025Monthly performance summary for 2025-08 focusing on delivering core SDK capabilities, improving test coverage, and aligning with release readiness for hiero-sdk-java.
August 2025
3 Commits • 2 Features
Aug 1, 2025Monthly performance summary for 2025-08 focusing on delivering core SDK capabilities, improving test coverage, and aligning with release readiness for hiero-sdk-java.
July 2025
9 Commits • 5 Features
Jul 1, 2025July 2025 monthly summary for hiero-sdk-java: Delivered high-impact feature work and reliability improvements across EVM address handling, data throughput, release readiness, file operations, and test coverage. Implemented EVM address API modernization to standardize handling via toEvmAddress and phase out deprecated toSolidityAddress, aligning core address utilities. Enabled jumbo Ethereum transactions by increasing MAX_ETHEREUM_DATA_SIZE and adapting flows to hex-encoded payloads, with robust tests for large data scenarios. Finalized Hiero SDK 2.61.0 release with explicit nodeId validation, Java 21 upgrade across workflows, deprecation of EthereumFlow in favor of EthereumTransaction, and migration/publishing docs. Expanded the Test Compatibility Kit (TCK) with endpoints for FileCreate/Update/Delete/Append and duration-based file expirations. Enhanced token creation test suite with new scenarios (decimal adjustments, NFT with zero decimals, null auto-renew period) and updated build workflow. Demonstrated strong proficiency in Java, cloud/CI pipelines, and test-driven development, delivering business value through improved reliability, scalability, and developer experience.
9 Commits • 5 Features
Jul 1, 2025July 2025 monthly summary for hiero-sdk-java: Delivered high-impact feature work and reliability improvements across EVM address handling, data throughput, release readiness, file operations, and test coverage. Implemented EVM address API modernization to standardize handling via toEvmAddress and phase out deprecated toSolidityAddress, aligning core address utilities. Enabled jumbo Ethereum transactions by increasing MAX_ETHEREUM_DATA_SIZE and adapting flows to hex-encoded payloads, with robust tests for large data scenarios. Finalized Hiero SDK 2.61.0 release with explicit nodeId validation, Java 21 upgrade across workflows, deprecation of EthereumFlow in favor of EthereumTransaction, and migration/publishing docs. Expanded the Test Compatibility Kit (TCK) with endpoints for FileCreate/Update/Delete/Append and duration-based file expirations. Enhanced token creation test suite with new scenarios (decimal adjustments, NFT with zero decimals, null auto-renew period) and updated build workflow. Demonstrated strong proficiency in Java, cloud/CI pipelines, and test-driven development, delivering business value through improved reliability, scalability, and developer experience.
July 2025
June 2025
8 Commits • 4 Features
Jun 1, 2025June 2025 performance summary for hiero-sdk-java focused on security, routing efficiency, and data integrity to enable scalable multi-node deployments and faster customer time-to-value. Delivered core architecture changes and features across transaction signing, node routing, token airdrops, and client-side shard/realm handling, with emphasis on release readiness and cross-node consistency. Key outcomes include improved transaction security with HSM integration, streamlined EthereumFlow routing to a single node, robust JSON-RPC endpoints for token airdrops, and persistent shard/realm support for client creation, alongside a reliability-focused bug fix to enforce single-node pre-checks.
June 2025
8 Commits • 4 Features
Jun 1, 2025June 2025 performance summary for hiero-sdk-java focused on security, routing efficiency, and data integrity to enable scalable multi-node deployments and faster customer time-to-value. Delivered core architecture changes and features across transaction signing, node routing, token airdrops, and client-side shard/realm handling, with emphasis on release readiness and cross-node consistency. Key outcomes include improved transaction security with HSM integration, streamlined EthereumFlow routing to a single node, robust JSON-RPC endpoints for token airdrops, and persistent shard/realm support for client creation, alongside a reliability-focused bug fix to enforce single-node pre-checks.
May 2025
8 Commits • 6 Features
May 1, 2025May 2025 performance summary for hiero-sdk-java (hiero-ledger/hiero-sdk-java). Key features delivered this month include: Node Creation Enhancement with Address Book Integration (commit be7619e2a80e2ef1336f8346d8b2dc487179c773); Public Key Alias Support in Account Creation (commit e3b6057a4574ddd4da66cec73f942c301ccaa00b); SDK Release 2.x Enhancements covering 2.56.0 to 2.57.0 (commits 64c6effb4587a74b8029c7102cf0558363bc239a, 323cf3ab92f3b780b640de63eed9adbe77bd9973, 9407f1373a047d01c77fa37d68ead00a28a141c0); Transaction Size Calculation APIs (commit 7b8e9f0418283728c086fa6e45a9b9f54bca69c1); gRPC-Web Proxy Endpoints Support (commit 85c58ed6056635607b0a510eb9116ecfb7028fac). Major maintenance work included, with tests and configuration adjustments associated with the 2.x releases. Overall impact this month centers on improved developer experience, better network configuration handling, and enhanced transaction planning. Top line achievements reflect progress in onboarding, aliasing flexibility, release stability, and web integration readiness.
8 Commits • 6 Features
May 1, 2025May 2025 performance summary for hiero-sdk-java (hiero-ledger/hiero-sdk-java). Key features delivered this month include: Node Creation Enhancement with Address Book Integration (commit be7619e2a80e2ef1336f8346d8b2dc487179c773); Public Key Alias Support in Account Creation (commit e3b6057a4574ddd4da66cec73f942c301ccaa00b); SDK Release 2.x Enhancements covering 2.56.0 to 2.57.0 (commits 64c6effb4587a74b8029c7102cf0558363bc239a, 323cf3ab92f3b780b640de63eed9adbe77bd9973, 9407f1373a047d01c77fa37d68ead00a28a141c0); Transaction Size Calculation APIs (commit 7b8e9f0418283728c086fa6e45a9b9f54bca69c1); gRPC-Web Proxy Endpoints Support (commit 85c58ed6056635607b0a510eb9116ecfb7028fac). Major maintenance work included, with tests and configuration adjustments associated with the 2.x releases. Overall impact this month centers on improved developer experience, better network configuration handling, and enhanced transaction planning. Top line achievements reflect progress in onboarding, aliasing flexibility, release stability, and web integration readiness.
May 2025
April 2025
7 Commits • 5 Features
Apr 1, 2025April 2025 for hiero-sdk-java focused on reliability, feature completeness, and testing. Delivered an SDK release with gRPC retry options, fixed critical protobuf state handling in TopicUpdateTransaction, expanded transaction capabilities with BatchTransaction and HIP-551, re-enabled HIP-1021 functionality, and extended testing with tokenAirdrop in the TCK.
April 2025
7 Commits • 5 Features
Apr 1, 2025April 2025 for hiero-sdk-java focused on reliability, feature completeness, and testing. Delivered an SDK release with gRPC retry options, fixed critical protobuf state handling in TopicUpdateTransaction, expanded transaction capabilities with BatchTransaction and HIP-551, re-enabled HIP-1021 functionality, and extended testing with tokenAirdrop in the TCK.
March 2025
5 Commits • 4 Features
Mar 1, 2025March 2025 focused on expanding JSON RPC capabilities, stabilizing EVM address handling, and enabling operational automation. Key work included delivering robust crypto transfer and token management RPCs, adding a practical Java example for scheduling network updates, and upgrading the SDK to 2.52.0 with updated docs and changelog. These efforts improve developer experience, reliability, and time-to-value for client integrations and operations.
5 Commits • 4 Features
Mar 1, 2025March 2025 focused on expanding JSON RPC capabilities, stabilizing EVM address handling, and enabling operational automation. Key work included delivering robust crypto transfer and token management RPCs, adding a practical Java example for scheduling network updates, and upgrading the SDK to 2.52.0 with updated docs and changelog. These efforts improve developer experience, reliability, and time-to-value for client integrations and operations.
March 2025
February 2025
8 Commits • 5 Features
Feb 1, 2025February 2025 — hiero-sdk-java (hiero-ledger) Summary: Focused delivery of HIP-1021–aware token tooling, API consistency improvements, monetization features, and expanded SDK reliability. The month delivered several business-value features that reduce onboarding friction, enable monetization options, and improve developer experience, while incrementally hardening the TCK and documentation to support stable growth of the ecosystem.
February 2025
8 Commits • 5 Features
Feb 1, 2025February 2025 — hiero-sdk-java (hiero-ledger) Summary: Focused delivery of HIP-1021–aware token tooling, API consistency improvements, monetization features, and expanded SDK reliability. The month delivered several business-value features that reduce onboarding friction, enable monetization options, and improve developer experience, while incrementally hardening the TCK and documentation to support stable growth of the ecosystem.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025: Delivered upcoming exchange rate support in TransactionReceipt for hiero-sdk-java, enabling clients to see the nextExchangeRate that will take effect after the current rate expires. Implemented by updating the TransactionReceipt constructor, serialization, and tests to handle and validate future exchange rate information. No other major bugs reported this month; maintenance focused on feature work and test coverage. Impact: improves forecasting accuracy and settlement readiness for downstream systems, reducing risk of rate-related surprises. Skills demonstrated: Java, data serialization, backward-compatible API changes, and comprehensive unit testing in a PR workflow.
1 Commits • 1 Features
Jan 1, 2025January 2025: Delivered upcoming exchange rate support in TransactionReceipt for hiero-sdk-java, enabling clients to see the nextExchangeRate that will take effect after the current rate expires. Implemented by updating the TransactionReceipt constructor, serialization, and tests to handle and validate future exchange rate information. No other major bugs reported this month; maintenance focused on feature work and test coverage. Impact: improves forecasting accuracy and settlement readiness for downstream systems, reducing risk of rate-related surprises. Skills demonstrated: Java, data serialization, backward-compatible API changes, and comprehensive unit testing in a PR workflow.
January 2025
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Quality Metrics
Correctness93.0%
Maintainability90.4%
Architecture89.6%
Performance83.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
GradleGroovyJavaKotlinMarkdownProtoProtobufProtocol BuffersPythonXML
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAPI RefactoringBackend DevelopmentBlockchainBug FixingBuild AutomationBuild ToolsCI/CDCode RefactoringCryptocurrency TransfersCryptographyDependency ManagementDistributed Systems
Repositories Contributed To
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