input-output-hk/acropolis
Oct 2025 – Feb 2026
5 Months active
Languages Used
BashJSONJavaScriptMakefileMarkdownPythonRustShell
Technical Skills
API DevelopmentAPI DocumentationAPI TestingBackend DevelopmentBash ScriptingBlockchain Development
Matthew Hounslow
PROFILE
Matthew Hounslow
Worked on the input-output-hk/acropolis repository, delivering robust backend features for blockchain state management and API reliability. Over five months, contributed to modularizing the snapshot bootstrapper, refactoring epoch and stake handling, and implementing fork-aware logic for accurate rewards and governance tracking. Leveraged Rust and TypeScript to enhance configuration management, error handling, and data serialization, while expanding test coverage and documentation. Introduced per-network database isolation and improved performance testing using K6. The work emphasized maintainability and correctness, addressing edge cases across Cardano protocol upgrades and ensuring scalable, observable systems for stake, UTxO, and governance data across multiple network environments.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
311Total
Bugs
55
Commits
311
Features
112
Lines of code
193,187
Activity Months5
Your Network
19 peopleShared Repositories
19
Work History
February 2026
5 Commits • 3 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for input-output-hk/acropolis. Focused on delivering fork-boundary features, improved stake accounting, and per-network persistence to strengthen reliability across mainnet and preview networks. Key achievements include: - AVVM Cancellation Handling and MIR application at Allegra fork: introduced cancellation of Byron AVVM UTxOs at the Allegra boundary, MIR eligibility checks based on account registration status, and enhanced UTxO state management to aggregate total cancelled AVVM value for accurate monetary calculations. Notable commit: e92e76af14c10fe3c1e43c3b5344842834f631e5. - Pointer Address Stake Handling Improvements for Conway fork: implemented removal of pointer address stakes at the Conway boundary, including new queries and state updates to reflect changes in stake distribution; added safeguards to skip removal during snapshot bootstrapping and simplified drep parameters to avoid deadlocks. Commits: 7d5c30e6c1519ddc2bd08af9a97363f50d240927, 954e45ce609d26812b72a6010bd6e01fa9e75997. - Network-wide Persistence Isolation and Preview Network Support: isolated the database per network and refined first-block persistence; updated DB path construction by network name and added omnibus config for a preview network, along with Mithril snapshot fetcher adjustments to resolve directories by network type. Commits: 2ecf9a1f5ff556bca13ebf322f28bbad48bf6d0b, 3101449398f21181204d3f96a97ab25ec69a23f2.
5 Commits • 3 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for input-output-hk/acropolis. Focused on delivering fork-boundary features, improved stake accounting, and per-network persistence to strengthen reliability across mainnet and preview networks. Key achievements include: - AVVM Cancellation Handling and MIR application at Allegra fork: introduced cancellation of Byron AVVM UTxOs at the Allegra boundary, MIR eligibility checks based on account registration status, and enhanced UTxO state management to aggregate total cancelled AVVM value for accurate monetary calculations. Notable commit: e92e76af14c10fe3c1e43c3b5344842834f631e5. - Pointer Address Stake Handling Improvements for Conway fork: implemented removal of pointer address stakes at the Conway boundary, including new queries and state updates to reflect changes in stake distribution; added safeguards to skip removal during snapshot bootstrapping and simplified drep parameters to avoid deadlocks. Commits: 7d5c30e6c1519ddc2bd08af9a97363f50d240927, 954e45ce609d26812b72a6010bd6e01fa9e75997. - Network-wide Persistence Isolation and Preview Network Support: isolated the database per network and refined first-block persistence; updated DB path construction by network name and added omnibus config for a preview network, along with Mithril snapshot fetcher adjustments to resolve directories by network type. Commits: 2ecf9a1f5ff556bca13ebf322f28bbad48bf6d0b, 3101449398f21181204d3f96a97ab25ec69a23f2.
February 2026
January 2026
61 Commits • 16 Features
Jan 1, 2026January 2026 (acropolis) - Focused on improving reward accuracy, governance visibility, and maintainability while tightening epoch-handling across Shelley/Allegra-era transitions. Delivered modularization and correctness improvements, plus extensive cleanup and observability enhancements that reduce risk in production payouts and governance actions.
January 2026
61 Commits • 16 Features
Jan 1, 2026January 2026 (acropolis) - Focused on improving reward accuracy, governance visibility, and maintainability while tightening epoch-handling across Shelley/Allegra-era transitions. Delivered modularization and correctness improvements, plus extensive cleanup and observability enhancements that reduce risk in production payouts and governance actions.
December 2025
157 Commits • 61 Features
Dec 1, 2025December 2025: Implemented foundational refactors and enhancements to the snapshot bootstrapper and epoch bootstrap flow in the Acropolis repository, enabling more reliable startup, clearer configuration, and scalable epoch handling. Key work includes modularizing the Snapshot Bootstrapper Core, introducing a Global Configuration for startup pathways, switching to Mithril startup, CBOR serialization enhancements, .cbor snapshot file paths, and improved error handling. Refactors also moved EpochBootstrapData to the types module, renamed Snapshot to EpochSnapshot, and expanded multi-era support in headers and nonces. These changes reduce initialization errors, improve debugging, and lay groundwork for robust epoch-based bootstrap and governance workflows.
157 Commits • 61 Features
Dec 1, 2025December 2025: Implemented foundational refactors and enhancements to the snapshot bootstrapper and epoch bootstrap flow in the Acropolis repository, enabling more reliable startup, clearer configuration, and scalable epoch handling. Key work includes modularizing the Snapshot Bootstrapper Core, introducing a Global Configuration for startup pathways, switching to Mithril startup, CBOR serialization enhancements, .cbor snapshot file paths, and improved error handling. Refactors also moved EpochBootstrapData to the types module, renamed Snapshot to EpochSnapshot, and expanded multi-era support in headers and nonces. These changes reduce initialization errors, improve debugging, and lay groundwork for robust epoch-based bootstrap and governance workflows.
December 2025
November 2025
68 Commits • 27 Features
Nov 1, 2025November 2025 accomplishments in input-output-hk/acropolis focused on reliability, API cleanliness, and snapshot workflow maturity. Key architectural improvements include standardized error handling with RESTError and QueryError migrated to thiserror; integration into state queries and endpoints, and removal of legacy error types. A major endpoint refactor reintroduced accounts/{stake_address}/addresses while cleaning up deprecated /drdd and /spdd endpoints. The snapshot bootstrapper was overhauled with improved configuration management, modular design, HTTP client tuning, bootstrapping notes, and enhanced logging for better traceability. Build and dev experience were strengthened with a dedicated run target, config/binary support, and LOG_LEVEL, complemented by targeted tests, Clippy fixes, and documentation updates. Overall, these changes reduce error surface, accelerate development cycles, and increase reliability of production snapshot processing.
November 2025
68 Commits • 27 Features
Nov 1, 2025November 2025 accomplishments in input-output-hk/acropolis focused on reliability, API cleanliness, and snapshot workflow maturity. Key architectural improvements include standardized error handling with RESTError and QueryError migrated to thiserror; integration into state queries and endpoints, and removal of legacy error types. A major endpoint refactor reintroduced accounts/{stake_address}/addresses while cleaning up deprecated /drdd and /spdd endpoints. The snapshot bootstrapper was overhauled with improved configuration management, modular design, HTTP client tuning, bootstrapping notes, and enhanced logging for better traceability. Build and dev experience were strengthened with a dedicated run target, config/binary support, and LOG_LEVEL, complemented by targeted tests, Clippy fixes, and documentation updates. Overall, these changes reduce error surface, accelerate development cycles, and increase reliability of production snapshot processing.
October 2025
20 Commits • 5 Features
Oct 1, 2025October 2025 monthly summary for input-output-hk/acropolis focused on strengthening the Active Stakes data path, expanding testing coverage, and improving API documentation and repository hygiene. The work delivered aligns with BF specifications, increases observability, and broadens performance validation to ensure scalable growth of stake data and on-chain observability.
20 Commits • 5 Features
Oct 1, 2025October 2025 monthly summary for input-output-hk/acropolis focused on strengthening the Active Stakes data path, expanding testing coverage, and improving API documentation and repository hygiene. The work delivered aligns with BF specifications, increases observability, and broadens performance validation to ensure scalable growth of stake data and on-chain observability.
October 2025
Activity
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Quality Metrics
Correctness93.0%
Maintainability88.4%
Architecture89.4%
Performance87.8%
AI Usage25.2%
Skills & Technologies
Programming Languages
BashJSONJavaScriptMakefileMarkdownPythonRustSQLShellTOML
Technical Skills
API DevelopmentAPI DocumentationAPI TestingAPI designAPI developmentAPI integrationBackend DevelopmentBash ScriptingBlockchain DevelopmentCBORCI/CDCargoCode CleanupCode FormattingCode Maintenance
Repositories Contributed To
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