hiero-ledger/hiero-mirror-node
Nov 2024 – Sep 2025
11 Months active
Languages Used
JavaKotlinSolidityGroovyYAMLMarkdownJavaScriptTypeScript
Technical Skills
API IntegrationBackend DevelopmentDatabase InteractionDependency ManagementEVMHedera
Kristiyan Selveliev
PROFILE
Kristiyan Selveliev
Kristiyan Selveliev contributed to the hiero-ledger/hiero-mirror-node repository by engineering modularized backend features and robust REST APIs that improved data integrity, scalability, and developer experience. He implemented layered Java services for network staking and block lookup, introduced state management refactors with caching, and delivered acceptance-tested endpoints for schedule and block retrieval. Kristiyan applied technologies such as Java, Spring Boot, and Solidity, focusing on concurrency, caching, and integration testing to ensure reliability. His work addressed complex challenges like entity ID collision avoidance and BigInteger validation, resulting in maintainable, well-documented code that accelerated safe deployments and streamlined downstream client integrations.
Overall Statistics
Feature vs Bugs
59%Features
Repository Contributions
67Total
Bugs
17
Commits
67
Features
24
Lines of code
15,069
Activity Months11
Your Network
47 people
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 highlights for hiero-ledger/hiero-mirror-node: Delivered Mirror Node REST API enhancements to support block lookup by hash and by numeric index, plus retrieval of all schedules. This work extends the MirrorNodeClient with new methods and adds acceptance tests to validate endpoint functionality, driving reliable data access for downstream apps. Key commit e5af194a2ebb541aa47a6eed5dee20d319deeb87 added tests for block-by-hash and schedules. Outcomes include improved developer productivity, higher API reliability, and faster integration timelines for clients consuming mirror-node data.
1 Commits • 1 Features
Sep 1, 2025September 2025 highlights for hiero-ledger/hiero-mirror-node: Delivered Mirror Node REST API enhancements to support block lookup by hash and by numeric index, plus retrieval of all schedules. This work extends the MirrorNodeClient with new methods and adds acceptance tests to validate endpoint functionality, driving reliable data access for downstream apps. Key commit e5af194a2ebb541aa47a6eed5dee20d319deeb87 added tests for block-by-hash and schedules. Outcomes include improved developer productivity, higher API reliability, and faster integration timelines for clients consuming mirror-node data.
September 2025
August 2025
4 Commits • 2 Features
Aug 1, 2025August 2025 monthly summary for hiero-ledger/hiero-mirror-node focused on delivering observable staking data, hardening input validation, and expanding API test coverage. Key outcomes include implementation of the Network Stake API with full Java layers (controllers, services, repositories, mappers) to surface network staking details such as reward fractions and staking periods. A critical bug fix was implemented in SyntheticTxnFactory to validate approve amounts against Long.MAX_VALUE, preventing BigInteger range issues and CONTRACT_REVERT_EXECUTED errors, accompanied by tests for fungible and non-fungible tokens. The network API testing suite and acceptance tests were expanded, adding new MirrorNodeClient methods and consolidating network tests for reliability. Overall impact: improved staking visibility for ecosystem partners, reduced runtime risk and overflow issues, and boosted test coverage and API reliability. Technologies/skills demonstrated: Java REST architecture, layered service design (controllers/services/repositories/mappers), BigInteger handling, robust testing (unit/integration/acceptance), and client API enhancements.
August 2025
4 Commits • 2 Features
Aug 1, 2025August 2025 monthly summary for hiero-ledger/hiero-mirror-node focused on delivering observable staking data, hardening input validation, and expanding API test coverage. Key outcomes include implementation of the Network Stake API with full Java layers (controllers, services, repositories, mappers) to surface network staking details such as reward fractions and staking periods. A critical bug fix was implemented in SyntheticTxnFactory to validate approve amounts against Long.MAX_VALUE, preventing BigInteger range issues and CONTRACT_REVERT_EXECUTED errors, accompanied by tests for fungible and non-fungible tokens. The network API testing suite and acceptance tests were expanded, adding new MirrorNodeClient methods and consolidating network tests for reliability. Overall impact: improved staking visibility for ecosystem partners, reduced runtime risk and overflow issues, and boosted test coverage and API reliability. Technologies/skills demonstrated: Java REST architecture, layered service design (controllers/services/repositories/mappers), BigInteger handling, robust testing (unit/integration/acceptance), and client API enhancements.
July 2025
6 Commits • 3 Features
Jul 1, 2025Concise monthly summary for 2025-07 for hiero-ledger/hiero-mirror-node focusing on business value and technical achievements across Storage caching, testing infra, logging correctness, and code organization. Highlights include default batch storage slot caching, K6-based storage read stress tests with EVM address standardization, a JSON-RPC compliant contract result log formatting fix, and a targeted codebase refactor for HederaCustomCodeOperation with updated release tooling.
6 Commits • 3 Features
Jul 1, 2025Concise monthly summary for 2025-07 for hiero-ledger/hiero-mirror-node focusing on business value and technical achievements across Storage caching, testing infra, logging correctness, and code organization. Highlights include default batch storage slot caching, K6-based storage read stress tests with EVM address standardization, a JSON-RPC compliant contract result log formatting fix, and a targeted codebase refactor for HederaCustomCodeOperation with updated release tooling.
July 2025
June 2025
6 Commits • 4 Features
Jun 1, 2025June 2025 performance summary for hiero-mirror-node: Key architecture enhancements, robust performance testing, and improved support for large payloads, all delivering measurable business value through reliability, throughput, and developer productivity.
June 2025
6 Commits • 4 Features
Jun 1, 2025June 2025 performance summary for hiero-mirror-node: Key architecture enhancements, robust performance testing, and improved support for large payloads, all delivering measurable business value through reliability, throughput, and developer productivity.
May 2025
3 Commits • 2 Features
May 1, 2025May 2025 monthly performance summary for hiero-mirror-node focused on delivering core scheduling capabilities, improving ID stability, and clarifying modular Web3 changes. Highlights include implementing Schedule KV state and associated repositories with integration tests, introducing per-thread caching in EntityIdSingleton to prevent ID conflicts across entity creation flows, and publishing documentation on breaking changes from modular Web3 redesigns. These efforts reduce operational risk, enhance reliability, and improve developer onboarding for the mirror node.
3 Commits • 2 Features
May 1, 2025May 2025 monthly performance summary for hiero-mirror-node focused on delivering core scheduling capabilities, improving ID stability, and clarifying modular Web3 changes. Highlights include implementing Schedule KV state and associated repositories with integration tests, introducing per-thread caching in EntityIdSingleton to prevent ID conflicts across entity creation flows, and publishing documentation on breaking changes from modular Web3 redesigns. These efforts reduce operational risk, enhance reliability, and improve developer onboarding for the mirror node.
May 2025
April 2025
9 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for repo hiero-ledger/hiero-mirror-node. This month focused on stabilizing modularized architectures, expanding test coverage for new flows, and setting up forward-compatible state management. Delivered fixes and features that enhance reliability, data integrity, and scalability, enabling safer rollout of modularized services and newer EVM configurations.
April 2025
9 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for repo hiero-ledger/hiero-mirror-node. This month focused on stabilizing modularized architectures, expanding test coverage for new flows, and setting up forward-compatible state management. Delivered fixes and features that enhance reliability, data integrity, and scalability, enabling safer rollout of modularized services and newer EVM configurations.
March 2025
10 Commits • 4 Features
Mar 1, 2025March 2025 performance summary for hiero-ledger/hiero-mirror-node. This month delivered foundational modularization and robustness improvements that increase reliability, scalability, and data integrity in cross-contract workflows. Key outcomes include a new global EntityId management approach, modularized Web3 startup/RTE initialization, hardened file loading for modularized flows, improved token metadata handling, and a more stable modularized testing infrastructure that enables targeted routing to modularized environments. These changes reduce collision risk, startup regressions, and test flakiness while accelerating safe deployment of future contracts and configurations.
10 Commits • 4 Features
Mar 1, 2025March 2025 performance summary for hiero-ledger/hiero-mirror-node. This month delivered foundational modularization and robustness improvements that increase reliability, scalability, and data integrity in cross-contract workflows. Key outcomes include a new global EntityId management approach, modularized Web3 startup/RTE initialization, hardened file loading for modularized flows, improved token metadata handling, and a more stable modularized testing infrastructure that enables targeted routing to modularized environments. These changes reduce collision risk, startup regressions, and test flakiness while accelerating safe deployment of future contracts and configurations.
March 2025
February 2025
10 Commits • 1 Features
Feb 1, 2025February 2025 monthly performance summary for hiero-ledger/hiero-mirror-node focused on delivering modularized-service testing alignment, robust bug fixes, and developer-facing documentation. The work enhanced test reliability, correctness of the mirror state semantics, and clarity for external integrations, enabling safer deployments and faster iteration.
February 2025
10 Commits • 1 Features
Feb 1, 2025February 2025 monthly performance summary for hiero-ledger/hiero-mirror-node focused on delivering modularized-service testing alignment, robust bug fixes, and developer-facing documentation. The work enhanced test reliability, correctness of the mirror state semantics, and clarity for external integrations, enabling safer deployments and faster iteration.
January 2025
6 Commits
Jan 1, 2025January 2025 performance summary for hiero-mirror-node focusing on stabilizing the test suite amid modularized services and upgrading dependencies to align with modularized state. Delivered reliability improvements in tests, refactored test setups for the new service structure, and updated dependencies to support ongoing modularization work.
6 Commits
Jan 1, 2025January 2025 performance summary for hiero-mirror-node focusing on stabilizing the test suite amid modularized services and upgrading dependencies to align with modularized state. Delivered reliability improvements in tests, refactored test setups for the new service structure, and updated dependencies to support ongoing modularization work.
January 2025
December 2024
4 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for hiero-mirror-node focusing on data integrity, compatibility, and stability improvements. Deliverables enhanced reliability, reduced risk of data leakage, and improved readiness for production and upstream integrations.
December 2024
4 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for hiero-mirror-node focusing on data integrity, compatibility, and stability improvements. Deliverables enhanced reliability, reduced risk of data leakage, and improved readiness for production and upstream integrations.
November 2024
8 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for hiero-mirror-node. Delivered Hedera SDK-aligned networking and schema management (NetworkInfo and SchemaRegistry), introduced a reusable services framework (ServicesRegistryImpl, SchemaRegistryImpl, ServiceMigratorImpl) with tests, and added Cancun EVM support to the mirror node web3 module. Fixed several critical bugs affecting deployment validation, operation naming, and data retrieval. These changes enhance SDK compatibility (0.56.x), migration readiness, EVM feature support, and data reliability, delivering tangible business value and stronger technical foundations.
8 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for hiero-mirror-node. Delivered Hedera SDK-aligned networking and schema management (NetworkInfo and SchemaRegistry), introduced a reusable services framework (ServicesRegistryImpl, SchemaRegistryImpl, ServiceMigratorImpl) with tests, and added Cancun EVM support to the mirror node web3 module. Fixed several critical bugs affecting deployment validation, operation naming, and data retrieval. These changes enhance SDK compatibility (0.56.x), migration readiness, EVM feature support, and data reliability, delivering tangible business value and stronger technical foundations.
November 2024
Activity
Loading activity data...
Quality Metrics
Correctness91.8%
Maintainability88.2%
Architecture86.8%
Performance81.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
GherkinGroovyJSONJavaJavaScriptKotlinMarkdownSQLSolidityTypeScript
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAPI TestingAcceptance TestingBackend DevelopmentBug FixingBuild ConfigurationCachingCode CleanupCode OrganizationCode RefactoringConcurrencyConfiguration ManagementCucumber
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline