Ivaylo Nikolov developed and maintained the hiero-sdk-js repository, delivering over 49 features and numerous reliability improvements across 19 months. He engineered core SDK capabilities for Hedera and Ethereum, including multi-transaction signing, EIP-7702 support, and atomic batch transactions, while ensuring robust integration with APIs and smart contracts. His technical approach emphasized test-driven development, backward compatibility, and seamless onboarding, using JavaScript, TypeScript, and Protocol Buffers. Ivaylo enhanced CI/CD pipelines, optimized build systems, and expanded cross-platform support, resulting in a stable, developer-friendly SDK. His work demonstrated depth in cryptography, transaction management, and full stack development, enabling safer, scalable blockchain integrations.
In April 2026, the hiero-sdk-js repository delivered foundational support for Hiero Hooks, updated the library to the latest version, and released a beta with Hooks and Logger constructor enhancements. This work enables automation, simplifies integration for developers, and positions the platform for broader dApp adoption. Key deliverables include re-enabled hooks, user-facing examples for account and contract hooks, and a stable release process for the Hooks feature set.
In April 2026, the hiero-sdk-js repository delivered foundational support for Hiero Hooks, updated the library to the latest version, and released a beta with Hooks and Logger constructor enhancements. This work enables automation, simplifies integration for developers, and positions the platform for broader dApp adoption. Key deliverables include re-enabled hooks, user-facing examples for account and contract hooks, and a stable release process for the Hooks feature set.
March 2026 monthly summary for hiero-sdk-js. Key features delivered: Slack Bot GitHub Notifications Integration; SDK crypto compatibility and browser tooling improvements (TypeScript 5.9.3 upgrade and Uint8Array handling); CI/build pipeline modernization with Hiero Solo updates. Major bugs fixed: None reported. Overall impact and accomplishments: Improved cross-team collaboration and issue visibility through automated Slack notifications, enhanced cryptographic functionality across browser and Node environments, and more reliable builds with updated CI tooling. Technologies/skills demonstrated: TypeScript 5.9.3, Uint8Array handling, Slack bot integration, CI/CD automation with Hiero Solo.
March 2026 monthly summary for hiero-sdk-js. Key features delivered: Slack Bot GitHub Notifications Integration; SDK crypto compatibility and browser tooling improvements (TypeScript 5.9.3 upgrade and Uint8Array handling); CI/build pipeline modernization with Hiero Solo updates. Major bugs fixed: None reported. Overall impact and accomplishments: Improved cross-team collaboration and issue visibility through automated Slack notifications, enhanced cryptographic functionality across browser and Node environments, and more reliable builds with updated CI tooling. Technologies/skills demonstrated: TypeScript 5.9.3, Uint8Array handling, Slack bot integration, CI/CD automation with Hiero Solo.
February 2026 (2026-02) for hiero-ledger/hiero-sdk-js: Delivered core Hedera SDK enhancements and CI/CD improvements, enabling dynamic EVM interactions, HIP-1195 multi-node data access, and faster, more reliable releases. Key milestones include EVM hook functionality, HIP-1195 support with multi-node GetRecord/GetReceipt, and CI/CD optimizations, all prepared for beta release.
February 2026 (2026-02) for hiero-ledger/hiero-sdk-js: Delivered core Hedera SDK enhancements and CI/CD improvements, enabling dynamic EVM interactions, HIP-1195 multi-node data access, and faster, more reliable releases. Key milestones include EVM hook functionality, HIP-1195 support with multi-node GetRecord/GetReceipt, and CI/CD optimizations, all prepared for beta release.
January 2026 monthly summary for hiero-ledger/hiero-sdk-js focusing on expanding transaction handling capabilities, improving date accuracy for future years, and preparing for the v2.79.0 release. The work emphasizes test coverage, reliability, and business value through robust validation of large transactions and future-proof date handling.
January 2026 monthly summary for hiero-ledger/hiero-sdk-js focusing on expanding transaction handling capabilities, improving date accuracy for future years, and preparing for the v2.79.0 release. The work emphasizes test coverage, reliability, and business value through robust validation of large transactions and future-proof date handling.
December 2025 monthly summary for hiero-sdk-js: Delivered Ethereum Transaction Type 4 (EIP-7702) support, including new data classes and encoding/decoding workflows, with SDK-level APIs to create and manage Type 4 transactions. Published release v2.79.0 beta.13 to enable early adoption and feedback, aligning with the roadmap toward modern transaction types and broader ecosystem interoperability.
December 2025 monthly summary for hiero-sdk-js: Delivered Ethereum Transaction Type 4 (EIP-7702) support, including new data classes and encoding/decoding workflows, with SDK-level APIs to create and manage Type 4 transactions. Published release v2.79.0 beta.13 to enable early adoption and feedback, aligning with the roadmap toward modern transaction types and broader ecosystem interoperability.
November 2025 monthly summary for hiero-sdk-js focusing on business value and technical achievement. Delivered major protobuf upgrade, improved node account ID handling and reliability, expanded testing coverage across platforms, and released multiple packaging iterations to align with Hedera SDK changes. The work culminated in more reliable cross-platform SDK usage and quicker integration for clients.
November 2025 monthly summary for hiero-sdk-js focusing on business value and technical achievement. Delivered major protobuf upgrade, improved node account ID handling and reliability, expanded testing coverage across platforms, and released multiple packaging iterations to align with Hedera SDK changes. The work culminated in more reliable cross-platform SDK usage and quicker integration for clients.
October 2025 monthly summary for hiero-ledger/hiero-sdk-js focusing on web proxy enhancements and pagination fixes. Delivered new gRPC web proxy endpoints and expanded connectivity with two additional proxy nodes (node33.swirldslabs.com:443 and node34.swirldslabs.com:443; AccountIds 36 and 37), aligned with the 2.74.0 release for proxy support and Metro bundler compatibility. Fixed web environment pagination issue in AddressBookQuery to ensure all pages are retrieved from the Mirror Node API, improving data completeness.
October 2025 monthly summary for hiero-ledger/hiero-sdk-js focusing on web proxy enhancements and pagination fixes. Delivered new gRPC web proxy endpoints and expanded connectivity with two additional proxy nodes (node33.swirldslabs.com:443 and node34.swirldslabs.com:443; AccountIds 36 and 37), aligned with the 2.74.0 release for proxy support and Metro bundler compatibility. Fixed web environment pagination issue in AddressBookQuery to ensure all pages are retrieved from the Mirror Node API, improving data completeness.
September 2025 (2025-09) monthly summary for hiero-sdk-js focusing on business value delivery and technical robustness. Key features delivered include Schedule Transactions with Custom Fee Limits, enabling explicit maximum fees for Hedera transactions and preventing overspend, with updates to transaction data structures and comprehensive integration tests. Major bugs fixed include SDK robustness enhancements: negative NodeId checks and NodeId-to-Long conversion, upgrade to Hedera SDK v2.73.0, and dependency pinning to improve stability across builds. Overall impact includes improved cost predictability for users, reduced overspend risk, and increased reliability and maintainability of the SDK. Technologies/skills demonstrated include TypeScript/JavaScript SDK development, Hedera SDK integration, test automation with integration tests, data structure design, dependency management, and CI readiness.
September 2025 (2025-09) monthly summary for hiero-sdk-js focusing on business value delivery and technical robustness. Key features delivered include Schedule Transactions with Custom Fee Limits, enabling explicit maximum fees for Hedera transactions and preventing overspend, with updates to transaction data structures and comprehensive integration tests. Major bugs fixed include SDK robustness enhancements: negative NodeId checks and NodeId-to-Long conversion, upgrade to Hedera SDK v2.73.0, and dependency pinning to improve stability across builds. Overall impact includes improved cost predictability for users, reduced overspend risk, and increased reliability and maintainability of the SDK. Technologies/skills demonstrated include TypeScript/JavaScript SDK development, Hedera SDK integration, test automation with integration tests, data structure design, dependency management, and CI readiness.
Month: 2025-08 — This month delivered core feature improvements, reliability fixes, and CI/CD enhancements for hiero-sdk-js, resulting in a smoother migration path to the v2.x ecosystem and more robust releases.
Month: 2025-08 — This month delivered core feature improvements, reliability fixes, and CI/CD enhancements for hiero-sdk-js, resulting in a smoother migration path to the v2.x ecosystem and more robust releases.
July 2025 (2025-07) — Hiero SDK JS: Key developer-focused deliverables spanning documentation, frontend features, and backend improvements, with a strong emphasis on onboarding, performance, and safety. Key deliverables: - Documentation and upgrade guides to ease onboarding and migration from @hashgraph/sdk to @hiero/sdk v3, including JSDoc-enhanced README and migration notes. - Jumbo Ethereum Transactions feature enabling large calldata handling, with a dedicated page and an enhanced EthereumFlow for jumbo payloads to demonstrate Hedera-Ethereum interop. - gRPC-web proxy frontend example showcasing Hedera interaction via a proxy, with dynamic node updates and account creation, plus environment updates for browser and Node.js. - TopicMessageQuery polling frontend example: React-based UI to poll Hedera topics via mirror node, listen to messages, create topics, and display real-time updates. - Backend API/Proto and Build System enhancements: protobuf version bumps to 0.65.0, new EVM data structures and state-related fields, and an integration test; plus a critical bug fix enforcing explicit nodeId for NodeUpdate/NodeDelete and correcting X-User-Agent header for accurate Consensus Node identification.
July 2025 (2025-07) — Hiero SDK JS: Key developer-focused deliverables spanning documentation, frontend features, and backend improvements, with a strong emphasis on onboarding, performance, and safety. Key deliverables: - Documentation and upgrade guides to ease onboarding and migration from @hashgraph/sdk to @hiero/sdk v3, including JSDoc-enhanced README and migration notes. - Jumbo Ethereum Transactions feature enabling large calldata handling, with a dedicated page and an enhanced EthereumFlow for jumbo payloads to demonstrate Hedera-Ethereum interop. - gRPC-web proxy frontend example showcasing Hedera interaction via a proxy, with dynamic node updates and account creation, plus environment updates for browser and Node.js. - TopicMessageQuery polling frontend example: React-based UI to poll Hedera topics via mirror node, listen to messages, create topics, and display real-time updates. - Backend API/Proto and Build System enhancements: protobuf version bumps to 0.65.0, new EVM data structures and state-related fields, and an integration test; plus a critical bug fix enforcing explicit nodeId for NodeUpdate/NodeDelete and correcting X-User-Agent header for accurate Consensus Node identification.
June 2025 performance summary for hiero-ledger/hiero-sdk-js. Delivered a Next.js-based example frontend demonstrating Hedera transaction size calculation and expanded the Client API with shard/realm support and enhanced Mirror Network handling. Release tooling and documentation updated to reflect v2.67.0. These efforts accelerate onboarding, improve integration reliability, and enhance developer experience across the SDK.
June 2025 performance summary for hiero-ledger/hiero-sdk-js. Delivered a Next.js-based example frontend demonstrating Hedera transaction size calculation and expanded the Client API with shard/realm support and enhanced Mirror Network handling. Release tooling and documentation updated to reflect v2.67.0. These efforts accelerate onboarding, improve integration reliability, and enhance developer experience across the SDK.
Month: 2025-05 — Focused on delivering robust SDK features for hiero-ledger/hiero-sdk-js, expanding node management flexibility, strengthening testing, and enabling support for large transactions and secure key handling. No explicit critical bugs fixed this month; emphasis on reliability, performance, and business value for Hedera integrations.
Month: 2025-05 — Focused on delivering robust SDK features for hiero-ledger/hiero-sdk-js, expanding node management flexibility, strengthening testing, and enabling support for large transactions and secure key handling. No explicit critical bugs fixed this month; emphasis on reliability, performance, and business value for Hedera integrations.
April 2025 (2025-04) monthly summary for hiero-sdk-js: Delivered tangible business value and strengthened resilience through new features, critical fixes, and alignment with Hedera network standards. Key features and enhancements include Batch Transactions (atomic multi-tx execution with examples and tests), browser support via a UMD build and demo, automatic retry on THROTTLED_AT_CONSENSUS, and protobuf/API upgrade to v0.61. Quality and reliability improvements include fixing AccountId instantiation and EVM address handling, removing deprecated endpoints, and updating testnet/previewnet endpoints. Release notes and docs were refreshed to reflect beta versions and changes. This work improves developer experience, reliability, and interoperability across environments, enabling faster integration and safer transaction flows.
April 2025 (2025-04) monthly summary for hiero-sdk-js: Delivered tangible business value and strengthened resilience through new features, critical fixes, and alignment with Hedera network standards. Key features and enhancements include Batch Transactions (atomic multi-tx execution with examples and tests), browser support via a UMD build and demo, automatic retry on THROTTLED_AT_CONSENSUS, and protobuf/API upgrade to v0.61. Quality and reliability improvements include fixing AccountId instantiation and EVM address handling, removing deprecated endpoints, and updating testnet/previewnet endpoints. Release notes and docs were refreshed to reflect beta versions and changes. This work improves developer experience, reliability, and interoperability across environments, enabling faster integration and safer transaction flows.
Concise monthly summary for 2025-03 for the hiero-sdk-js repository, focused on robustness, browser distribution readiness, and backward compatibility. Delivered key cryptographic fixes, resolved dependency initialization issues, and expanded distribution and onboarding capabilities to accelerate integration in web environments and with legacy code.
Concise monthly summary for 2025-03 for the hiero-sdk-js repository, focused on robustness, browser distribution readiness, and backward compatibility. Delivered key cryptographic fixes, resolved dependency initialization issues, and expanded distribution and onboarding capabilities to accelerate integration in web environments and with legacy code.
February 2025 — Delivered performance and reliability improvements in hiero-sdk-js, enhanced release stability, and refined token/topic auto-renew semantics. Key work includes parallel test execution and bundle optimization, TopicInfo serialization fix with unit tests, extensive release/CI and dependency upgrades, and improved auto-renew ID defaulting for creation transactions. These efforts reduced test times, improved build reliability, ensured data integrity, and clarified transaction semantics for developers and operators.
February 2025 — Delivered performance and reliability improvements in hiero-sdk-js, enhanced release stability, and refined token/topic auto-renew semantics. Key work includes parallel test execution and bundle optimization, TopicInfo serialization fix with unit tests, extensive release/CI and dependency upgrades, and improved auto-renew ID defaulting for creation transactions. These efforts reduced test times, improved build reliability, ensured data integrity, and clarified transaction semantics for developers and operators.
January 2025: Focused on delivering feature-rich SDK improvements, stabilizing tests, and preparing for the v2.57 release with documentation and dependency updates. Delivered read-only contract interactions, enhanced receipts, API cleanup, and improved developer docs, enabling easier integration and more reliable consumption of the hiero-sdk-js package.
January 2025: Focused on delivering feature-rich SDK improvements, stabilizing tests, and preparing for the v2.57 release with documentation and dependency updates. Delivered read-only contract interactions, enhanced receipts, API cleanup, and improved developer docs, enabling easier integration and more reliable consumption of the hiero-sdk-js package.
December 2024: Key enhancements in hiero-sdk-js focused on reliability, scalability, and release readiness. Implemented long-term scheduling with recursive scheduling error codes (HIP 423), upgraded 64-bit integer handling and protobuf typings, bumped proto version to v2.55.1 with release notes, and tightened CI/testing while cleaning up docs and examples. These changes reduce runtime risk for long-running financial transactions, improve type safety and developer experience, and accelerate future feature delivery.
December 2024: Key enhancements in hiero-sdk-js focused on reliability, scalability, and release readiness. Implemented long-term scheduling with recursive scheduling error codes (HIP 423), upgraded 64-bit integer handling and protobuf typings, bumped proto version to v2.55.1 with release notes, and tightened CI/testing while cleaning up docs and examples. These changes reduce runtime risk for long-running financial transactions, improve type safety and developer experience, and accelerate future feature delivery.
November 2024 focused on reliability, release readiness, and maintainability for hiero-sdk-js. Key efforts delivered comprehensive tests for FileAppendTransaction, and a coordinated release/update cycle for v2.53.0 and v2.54.x, aligning tooling, dependencies, and release artifacts to reduce risk and streamline future deliveries.
November 2024 focused on reliability, release readiness, and maintainability for hiero-sdk-js. Key efforts delivered comprehensive tests for FileAppendTransaction, and a coordinated release/update cycle for v2.53.0 and v2.54.x, aligning tooling, dependencies, and release artifacts to reduce risk and streamline future deliveries.
October 2024 — Hiero SDK JS: Delivered multi-transaction signing capability through an API refactor of SignatureMap and related classes, enabling signing across multiple transactions. Completed beta release management for v2.53.0-beta.x with consolidated changelogs, version bumps, ESLint configuration updates, and cleanup of non-functional examples, enhancing release reliability and code quality. These efforts reduce signer coordination friction, improve maintainability, and strengthen the SDK's developer experience across integrations.
October 2024 — Hiero SDK JS: Delivered multi-transaction signing capability through an API refactor of SignatureMap and related classes, enabling signing across multiple transactions. Completed beta release management for v2.53.0-beta.x with consolidated changelogs, version bumps, ESLint configuration updates, and cleanup of non-functional examples, enhancing release reliability and code quality. These efforts reduce signer coordination friction, improve maintainability, and strengthen the SDK's developer experience across integrations.
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