hiero-ledger/hiero-mirror-node
Nov 2024 – Mar 2026
17 Months active
Languages Used
JavaJavaScriptKotlinShellGherkinGradleMarkdownYAML
Technical Skills
API DevelopmentBackend DevelopmentBuild AutomationCI/CDCode FormattingNode.js
Stoyan Dimitrov
PROFILE
Stoyan Dimitrov
Stoyan Dimitrov engineered backend features and reliability improvements for the hiero-ledger/hiero-mirror-node repository, focusing on scalable API development, database optimization, and robust smart contract integration. He delivered persistent node registries, dynamic configuration, and performance-oriented caching strategies, using Java and Spring Boot to streamline contract state retrieval and reduce database load. Stoyan migrated critical logic from JavaScript to Java, enhanced REST API endpoints for network management, and implemented concurrency controls to ensure safe transaction processing. His work included rigorous testing, CI/CD stabilization, and schema migrations, resulting in maintainable, high-throughput systems that improved operational oversight, data integrity, and developer productivity.
Overall Statistics
Feature vs Bugs
70%Features
Repository Contributions
67Total
Bugs
11
Commits
67
Features
26
Lines of code
23,896
Activity Months17
Your Network
48 peopleWork History
March 2026
4 Commits • 1 Features
Mar 1, 2026March 2026 delivered a robust, persistent node registry and dynamic configuration for the hiero-mirror-node component, enabling auto-discovery, improved data integrity, and traceable changes across the node lifecycle.
4 Commits • 1 Features
Mar 1, 2026March 2026 delivered a robust, persistent node registry and dynamic configuration for the hiero-mirror-node component, enabling auto-discovery, improved data integrity, and traceable changes across the node lifecycle.
March 2026
February 2026
6 Commits • 1 Features
Feb 1, 2026February 2026 highlights end-to-end feature delivery for code delegation and Ethereum transaction replay in hiero-mirror-node, paired with robust network-fee calculations. The work reinforces EOAs code-delegation storage, replay/trace capabilities, and accurate gas/fee handling, improving debugging, reliability, and business value.
February 2026
6 Commits • 1 Features
Feb 1, 2026February 2026 highlights end-to-end feature delivery for code delegation and Ethereum transaction replay in hiero-mirror-node, paired with robust network-fee calculations. The work reinforces EOAs code-delegation storage, replay/trace capabilities, and accurate gas/fee handling, improving debugging, reliability, and business value.
January 2026
3 Commits • 3 Features
Jan 1, 2026Concise monthly summary for 2026-01 focused on delivering performance enhancements, API enablement, and framework upgrades for hiero-mirror-node. Highlights include a performance-oriented refactor of the supply query, enabling the Java network supply REST API by default, and migrating to Spring Boot 4-compatible dependencies with aligned config and management. These efforts improve scalability, integration ease, and long-term maintainability.
3 Commits • 3 Features
Jan 1, 2026Concise monthly summary for 2026-01 focused on delivering performance enhancements, API enablement, and framework upgrades for hiero-mirror-node. Highlights include a performance-oriented refactor of the supply query, enabling the Java network supply REST API by default, and migrating to Spring Boot 4-compatible dependencies with aligned config and management. These efforts improve scalability, integration ease, and long-term maintainability.
January 2026
December 2025
6 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for repository hiero-ledger/hiero-mirror-node. Delivered a set of reliability and performance enhancements across the backend, plus a strategic refactor moving network fees logic from JavaScript to Java. These efforts reduced database load, mitigated cache stampede risks, improved test reliability, and streamlined EVM-related validations, delivering measurable business value and maintainability gains. The work supports faster release cycles and more predictable prod performance.
December 2025
6 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for repository hiero-ledger/hiero-mirror-node. Delivered a set of reliability and performance enhancements across the backend, plus a strategic refactor moving network fees logic from JavaScript to Java. These efforts reduced database load, mitigated cache stampede risks, improved test reliability, and streamlined EVM-related validations, delivering measurable business value and maintainability gains. The work supports faster release cycles and more predictable prod performance.
November 2025
2 Commits • 1 Features
Nov 1, 2025Concise monthly summary for 2025-11 focusing on delivering new REST API capabilities for hook management and storage in hiero-mirror-node, with emphasis on business value, system observability, and developer productivity. No major bug fixes required this month as work centered on feature delivery and API stabilization ahead of rollout.
2 Commits • 1 Features
Nov 1, 2025Concise monthly summary for 2025-11 focusing on delivering new REST API capabilities for hook management and storage in hiero-mirror-node, with emphasis on business value, system observability, and developer productivity. No major bug fixes required this month as work centered on feature delivery and API stabilization ahead of rollout.
November 2025
October 2025
2 Commits • 1 Features
Oct 1, 2025Month: 2025-10. Focused on reliability and performance improvements for system accounts in hiero-mirror-node. Key work centered on robust handling of historical contract calls and reducing database load via caching, delivering more stable data paths and faster retrieval for small system accounts.
October 2025
2 Commits • 1 Features
Oct 1, 2025Month: 2025-10. Focused on reliability and performance improvements for system accounts in hiero-mirror-node. Key work centered on robust handling of historical contract calls and reducing database load via caching, delivering more stable data paths and faster retrieval for small system accounts.
September 2025
2 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for hiero-mirror-node focused on delivering robust API capabilities and improving developer experience. Key work concentrated on token/NFT access enhancements, REST API pagination, and token name lookup to improve data discoverability and integration reliability.
2 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for hiero-mirror-node focused on delivering robust API capabilities and improving developer experience. Key work concentrated on token/NFT access enhancements, REST API pagination, and token name lookup to improve data discoverability and integration reliability.
September 2025
August 2025
4 Commits • 2 Features
Aug 1, 2025Summary for 2025-08 (hiero-ledger/hiero-mirror-node): Delivered targeted improvements to API exposure control, startup performance, and transaction safety, alongside reinforced robustness tests. Implemented a feature-flag mechanism to gate API endpoints via ingress with a fallback to the original JavaScript API for unavailable endpoints, and introduced ApplicationWarmup to proactively preload web3 resources during Kubernetes readiness probes. Fixed a critical concurrency issue in the transaction execution path by synchronizing the factory create method, and expanded importer robustness with tests validating error handling for out-of-order blocks. The combined work enhances reliability, reduces startup latency, and strengthens data integrity in production deployments.
August 2025
4 Commits • 2 Features
Aug 1, 2025Summary for 2025-08 (hiero-ledger/hiero-mirror-node): Delivered targeted improvements to API exposure control, startup performance, and transaction safety, alongside reinforced robustness tests. Implemented a feature-flag mechanism to gate API endpoints via ingress with a fallback to the original JavaScript API for unavailable endpoints, and introduced ApplicationWarmup to proactively preload web3 resources during Kubernetes readiness probes. Fixed a critical concurrency issue in the transaction execution path by synchronizing the factory create method, and expanded importer robustness with tests validating error handling for out-of-order blocks. The combined work enhances reliability, reduces startup latency, and strengthens data integrity in production deployments.
July 2025
1 Commits • 1 Features
Jul 1, 2025Month 2025-07: Delivered a robust database rollback capability for hiero-mirror-node via a drop.sql script to reset database state for safe version rollbacks. The script drops tables, views, materialized views, types, functions, procedures, and the mirror_api role; includes validation that the importer can recover data after applying the script, and was tested in a local Kubernetes cluster against Citus. This work reduces deployment risk and enables safer, faster rollbacks across environments.
1 Commits • 1 Features
Jul 1, 2025Month 2025-07: Delivered a robust database rollback capability for hiero-mirror-node via a drop.sql script to reset database state for safe version rollbacks. The script drops tables, views, materialized views, types, functions, procedures, and the mirror_api role; includes validation that the importer can recover data after applying the script, and was tested in a local Kubernetes cluster against Citus. This work reduces deployment risk and enables safer, faster rollbacks across environments.
July 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 performance-focused sprint for hiero-mirror-node. Delivered a feature that significantly accelerates contract state retrieval by batching and caching contract slots, reducing unnecessary pre-loading and prioritizing recently queried slots. Implemented in the hiero-ledger/hiero-mirror-node codebase with a dedicated change to minimize storage query overhead and improve responsiveness for contract state lookups.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 performance-focused sprint for hiero-mirror-node. Delivered a feature that significantly accelerates contract state retrieval by batching and caching contract slots, reducing unnecessary pre-loading and prioritizing recently queried slots. Implemented in the hiero-ledger/hiero-mirror-node codebase with a dedicated change to minimize storage query overhead and improve responsiveness for contract state lookups.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 (2025-05) performance and reliability focus for hiero-ledger/hiero-mirror-node. Delivered a caching and test-stability upgrade set that reduces DB load, improves latency under burst traffic, and strengthens test reliability across EVM version changes. These efforts collectively enhanced throughput, reduced operational risk, and accelerated feedback cycles for production workloads.
2 Commits • 1 Features
May 1, 2025May 2025 (2025-05) performance and reliability focus for hiero-ledger/hiero-mirror-node. Delivered a caching and test-stability upgrade set that reduces DB load, improves latency under burst traffic, and strengthens test reliability across EVM version changes. These efforts collectively enhanced throughput, reduced operational risk, and accelerated feedback cycles for production workloads.
May 2025
April 2025
6 Commits • 2 Features
Apr 1, 2025April 2025 — hiero-ledger/hiero-mirror-node: Delivered targeted test coverage for token fee management, implemented a critical performance optimization for token lookups, and hardened the REST/API and test suite against edge cases to improve reliability and operator confidence on Hedera network deployments. The work strengthens business value by accelerating token operations, reducing latency on large datasets, and reducing error-prone scenarios in production and test environments.
April 2025
6 Commits • 2 Features
Apr 1, 2025April 2025 — hiero-ledger/hiero-mirror-node: Delivered targeted test coverage for token fee management, implemented a critical performance optimization for token lookups, and hardened the REST/API and test suite against edge cases to improve reliability and operator confidence on Hedera network deployments. The work strengthens business value by accelerating token operations, reducing latency on large datasets, and reducing error-prone scenarios in production and test environments.
March 2025
6 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03: hiero-ledger/hiero-mirror-node delivered Modularized Transaction Execution Service rollout with traffic routing. This involved gradual rollout with configurable traffic percentage, header-based traffic control, and cross-component status synchronization. Telemetry added: metrics and logging for transaction traffic splits. Privacy improvement: avoid printing full account data when payer is invalid. Tests expanded for modularized features in token fee scenarios. This release was supported by six commits: 56ed054c661ae032f7370332a7f51eb70e9b9fa6, 8f9aa6b05a0c866236bd467c72220ecbd933c926, 2abed4fad477b58b115c5a2d1909af47e3028764, 1449467fe8566d055f6a2911de8ba9d13437ca16, a0347bfabd1bb43e56aa6f7b6a5f715f314e3fcd, 2681291b3b3e7592bdd279fa553dca691c21dd31
6 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03: hiero-ledger/hiero-mirror-node delivered Modularized Transaction Execution Service rollout with traffic routing. This involved gradual rollout with configurable traffic percentage, header-based traffic control, and cross-component status synchronization. Telemetry added: metrics and logging for transaction traffic splits. Privacy improvement: avoid printing full account data when payer is invalid. Tests expanded for modularized features in token fee scenarios. This release was supported by six commits: 56ed054c661ae032f7370332a7f51eb70e9b9fa6, 8f9aa6b05a0c866236bd467c72220ecbd933c926, 2abed4fad477b58b115c5a2d1909af47e3028764, 1449467fe8566d055f6a2911de8ba9d13437ca16, a0347bfabd1bb43e56aa6f7b6a5f715f314e3fcd, 2681291b3b3e7592bdd279fa553dca691c21dd31
March 2025
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025: For hiero-mirror-node, delivered two core items focused on reliability and compatibility. (1) Contract Call Tests Robustness and Account Handling Improvements—expanded testing coverage for contract call operations (burn, wipe, pause, freeze) across token types; ensured payer accounts and hollow account scenarios are correctly tested; fixed test failures in key test classes. Commits: e67266df2d666ebe856995467da8737514627679, 7b3c84ca0dd66f3ab8d879d5566415dd32c6401a, c7e376d0b5d8d6ecd6ea4603f2358339e93e3d2e. (2) Hedera App Library Version Upgrade and Compatibility—upgraded Hedera app library from 0.58.4 to 0.59.0 and adjusted related components to resolve compilation issues and ensure smooth integration. Commit: 8b4c7c0dc1f293bdc35eb54e5650abbeab68e00c.
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025: For hiero-mirror-node, delivered two core items focused on reliability and compatibility. (1) Contract Call Tests Robustness and Account Handling Improvements—expanded testing coverage for contract call operations (burn, wipe, pause, freeze) across token types; ensured payer accounts and hollow account scenarios are correctly tested; fixed test failures in key test classes. Commits: e67266df2d666ebe856995467da8737514627679, 7b3c84ca0dd66f3ab8d879d5566415dd32c6401a, c7e376d0b5d8d6ecd6ea4603f2358339e93e3d2e. (2) Hedera App Library Version Upgrade and Compatibility—upgraded Hedera app library from 0.58.4 to 0.59.0 and adjusted related components to resolve compilation issues and ensure smooth integration. Commit: 8b4c7c0dc1f293bdc35eb54e5650abbeab68e00c.
January 2025
8 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for hiero-ledger/hiero-mirror-node. Key developments include cryptographic key generation validation, code quality improvements, and test stabilization for precompile-related tests. These deliver business value by reducing key-generation errors, stabilizing CI, and improving deployment confidence.
8 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for hiero-ledger/hiero-mirror-node. Key developments include cryptographic key generation validation, code quality improvements, and test stabilization for precompile-related tests. These deliver business value by reducing key-generation errors, stabilizing CI, and improving deployment confidence.
January 2025
December 2024
8 Commits • 2 Features
Dec 1, 2024December 2024: Implemented a configuration-driven Admin Key exposure control for the Network Nodes API via a feature flag, enabling secure exposure toggling without API changes. Completed comprehensive code quality, CI/build stabilization across hiero-mirror-node, including Spotless formatting enforcement, SonarQube housekeeping, test cleanup, and build config tweaks. These efforts reduce release risk, improve maintainability, and accelerate future iterations. Technologies demonstrated include feature flags, configuration-driven API behavior, Spotless, SonarQube, CI/CD pipelines, and code refactoring.
December 2024
8 Commits • 2 Features
Dec 1, 2024December 2024: Implemented a configuration-driven Admin Key exposure control for the Network Nodes API via a feature flag, enabling secure exposure toggling without API changes. Completed comprehensive code quality, CI/build stabilization across hiero-mirror-node, including Spotless formatting enforcement, SonarQube housekeeping, test cleanup, and build config tweaks. These efforts reduce release risk, improve maintainability, and accelerate future iterations. Technologies demonstrated include feature flags, configuration-driven API behavior, Spotless, SonarQube, CI/CD pipelines, and code refactoring.
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 highlights: Delivered a backend enhancement to hiero-mirror-node for network node visibility by exposing admin_key in the /network/nodes endpoint and adding a Node model with updates to NetworkNodeViewModel. This improves operational oversight and auditability of network nodes. Also completed a project-wide code formatting cleanup to boost readability and maintainability without altering behavior. These changes enhance API accuracy for network management and reduce future maintenance costs.
2 Commits • 1 Features
Nov 1, 2024November 2024 highlights: Delivered a backend enhancement to hiero-mirror-node for network node visibility by exposing admin_key in the /network/nodes endpoint and adding a Node model with updates to NetworkNodeViewModel. This improves operational oversight and auditability of network nodes. Also completed a project-wide code formatting cleanup to boost readability and maintainability without altering behavior. These changes enhance API accuracy for network management and reduce future maintenance costs.
November 2024
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Quality Metrics
Correctness90.2%
Maintainability83.6%
Architecture82.8%
Performance77.6%
AI Usage24.8%
Skills & Technologies
Programming Languages
GherkinGradleJavaJavaScriptKotlinMarkdownSQLShellSolidityYAML
Technical Skills
API DevelopmentAPI IntegrationAPI TestingAPI developmentBackend DevelopmentBug FixingBuild AutomationBuild ConfigurationCI/CDCachingCaffeine CacheCode AnalysisCode FormattingCode QualityCode Quality Tools
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