input-output-hk/cardano-js-sdk
Oct 2024 – Sep 2025
10 Months active
Languages Used
TypeScriptJavaScriptNix
Technical Skills
BlockchainCardanoTypeScriptAPI IntegrationCIP30Cardano Development
Angel Castillo
PROFILE
Angel Castillo
Angel Castillo contributed to the input-output-hk/lace repository by engineering cross-chain wallet features and optimizing transaction workflows for both Cardano and Bitcoin. He implemented backend and frontend enhancements using TypeScript, JavaScript, and React, focusing on robust API integration, asynchronous programming, and dependency management. His work included integrating Bitcoin support, refining fee estimation, and enabling metadata previews before signing, which improved user transparency and transaction reliability. Angel also modernized build processes and documentation, streamlined onboarding, and maintained SDK compatibility across modules. His approach emphasized maintainability, comprehensive test coverage, and seamless user experience, demonstrating depth in full stack cryptocurrency wallet development.
Overall Statistics
Feature vs Bugs
68%Features
Repository Contributions
43Total
Bugs
8
Commits
43
Features
17
Lines of code
6,227
Activity Months10
Your Network
115 peopleSame Organization
@iohk.io94
Shared Repositories
21
Work History
September 2025
5 Commits • 2 Features
Sep 1, 2025September 2025 (2025-09) performance highlights for input-output-hk/cardano-js-sdk focused on hardware wallet integration and Byron-era support. Delivered key improvements to hardware wallet signing mode detection and transaction data correctness across Trezor and Ledger, with multisig handling, includeNetworkId correctness, and PLUTUS_TRANSACTION classification for reference inputs. Added Byron era outputs support for hardware wallets, validating Byron-era addresses and transforming outputs accordingly. Implemented targeted bug fixes to tighten signing mode mapping and network field propagation, including Ledger-specific edge cases with reference inputs and no collateral.
5 Commits • 2 Features
Sep 1, 2025September 2025 (2025-09) performance highlights for input-output-hk/cardano-js-sdk focused on hardware wallet integration and Byron-era support. Delivered key improvements to hardware wallet signing mode detection and transaction data correctness across Trezor and Ledger, with multisig handling, includeNetworkId correctness, and PLUTUS_TRANSACTION classification for reference inputs. Added Byron era outputs support for hardware wallets, validating Byron-era addresses and transforming outputs accordingly. Implemented targeted bug fixes to tighten signing mode mapping and network field propagation, including Ledger-specific edge cases with reference inputs and no collateral.
September 2025
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for the Cardano JS SDK focus area.
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for the Cardano JS SDK focus area.
June 2025
6 Commits • 1 Features
Jun 1, 2025June 2025: Focused on enabling non-blocking cryptographic operations, fixing critical signing paths, and improving CI stability. The work delivered async crypto primitives for faster address derivation, corrected native script signing for multi-signature transactions, and Ledger signing optimizations, while stabilizing the test suite to reduce CI noise. Overall, this period enhanced performance, security, and developer productivity across the Cardano JS SDK.
6 Commits • 1 Features
Jun 1, 2025June 2025: Focused on enabling non-blocking cryptographic operations, fixing critical signing paths, and improving CI stability. The work delivered async crypto primitives for faster address derivation, corrected native script signing for multi-signature transactions, and Ledger signing optimizations, while stabilizing the test suite to reduce CI noise. Overall, this period enhanced performance, security, and developer productivity across the Cardano JS SDK.
June 2025
May 2025
3 Commits • 1 Features
May 1, 2025May 2025 performance summary for input-output-hk/cardano-js-sdk: Delivered robust input-selection enhancements and a critical documentation fix. Key features include LargeFirstInputSelector prioritizing large UTxOs (by asset quantity, then Lovelace value) with iterative UTxO aggregation to ensure fees are covered, plus a fallback mechanism to retry with alternative strategies to guarantee transaction construction under diverse error conditions. Major bug fix corrected UtxoBalanceInsufficient documentation to improve clarity. Impact: higher reliability and success rate of transaction construction under edge cases, improved fee coverage, and clearer developer/docs experience. Technologies/skills demonstrated: advanced input-selection algorithms, robust error handling with retries, modular architecture in JS/TS SDK, and strong documentation discipline. Commits touched: 05e6c45b812424ed06ae673113256acf71a11bd8; 509801fec25cba22f8628f6d45e8b6d213bb1272; 0500286435519fb5d59aebf3299035f85d2f6a91.
May 2025
3 Commits • 1 Features
May 1, 2025May 2025 performance summary for input-output-hk/cardano-js-sdk: Delivered robust input-selection enhancements and a critical documentation fix. Key features include LargeFirstInputSelector prioritizing large UTxOs (by asset quantity, then Lovelace value) with iterative UTxO aggregation to ensure fees are covered, plus a fallback mechanism to retry with alternative strategies to guarantee transaction construction under diverse error conditions. Major bug fix corrected UtxoBalanceInsufficient documentation to improve clarity. Impact: higher reliability and success rate of transaction construction under edge cases, improved fee coverage, and clearer developer/docs experience. Technologies/skills demonstrated: advanced input-selection algorithms, robust error handling with retries, modular architecture in JS/TS SDK, and strong documentation discipline. Commits touched: 05e6c45b812424ed06ae673113256acf71a11bd8; 509801fec25cba22f8628f6d45e8b6d213bb1272; 0500286435519fb5d59aebf3299035f85d2f6a91.
April 2025
6 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary: Delivered robust hardware-wallet transaction output formatting for the Cardano JS SDK, focusing on Ledger and Trezor compatibility. Implemented independent per-output formatting, reconciled Babbage vs legacy formats, and ensured correct handling of collateral returns. Added core APIs to detect Babbage-formatted outputs and integrated targeted fixes across device mappings to reduce cross-output coupling. Resulted in higher reliability for hardware signing, broader wallet support, and reduced risk of mis-serialization in production.
6 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary: Delivered robust hardware-wallet transaction output formatting for the Cardano JS SDK, focusing on Ledger and Trezor compatibility. Implemented independent per-output formatting, reconciled Babbage vs legacy formats, and ensured correct handling of collateral returns. Added core APIs to detect Babbage-formatted outputs and integrated targeted fixes across device mappings to reduce cross-output coupling. Resulted in higher reliability for hardware signing, broader wallet support, and reduced risk of mis-serialization in production.
April 2025
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025: Focused on business-value features and robustness in wallet logic. Delivered explicit blockchain identification for wallets and hardened transaction validity checks with regression coverage, improving UI differentiation, extension behavior, and submission safety across chains.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025: Focused on business-value features and robustness in wallet logic. Delivered explicit blockchain identification for wallets and hardened transaction validity checks with regression coverage, improving UI differentiation, extension behavior, and submission safety across chains.
January 2025
9 Commits • 5 Features
Jan 1, 2025January 2025 (2025-01): Delivered architectural and performance improvements across the Cardano JS SDK, focusing on flexible input resolution, API usability, and data access efficiency. Implemented BaseWallet Input Resolver System with dependency-injected input resolution and UTxO hints; modernized Crypto API by removing unnecessary async and introducing a ready initialization, enhancing startup reliability and performance; updated fee calculation to account for reference script sizes (breaking API change) for more accurate fees; improved transaction history fetch with a top-10 initial window and gap-free history to boost perceived performance; added local caching for Blockfrost data (transactions and UTXOs) to minimize API calls. These changes reduce startup latency, improve transaction accuracy, and enable more sophisticated wallet flows, delivering tangible business value and a smoother developer experience.
9 Commits • 5 Features
Jan 1, 2025January 2025 (2025-01): Delivered architectural and performance improvements across the Cardano JS SDK, focusing on flexible input resolution, API usability, and data access efficiency. Implemented BaseWallet Input Resolver System with dependency-injected input resolution and UTxO hints; modernized Crypto API by removing unnecessary async and introducing a ready initialization, enhancing startup reliability and performance; updated fee calculation to account for reference script sizes (breaking API change) for more accurate fees; improved transaction history fetch with a top-10 initial window and gap-free history to boost perceived performance; added local caching for Blockfrost data (transactions and UTXOs) to minimize API calls. These changes reduce startup latency, improve transaction accuracy, and enable more sophisticated wallet flows, delivering tangible business value and a smoother developer experience.
January 2025
December 2024
2 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for input-output-hk/cardano-js-sdk focusing on performance improvements and observability. Key features delivered include Asset Metadata Caching for Performance and Enhanced Observability for Cold Observable Provider. These changes reduced redundant API calls, improved data freshness balance, and provided better error visibility and debuggability across reactive streams. No critical bugs reported; overall impact is improved performance, reliability, and maintainability.
December 2024
2 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for input-output-hk/cardano-js-sdk focusing on performance improvements and observability. Key features delivered include Asset Metadata Caching for Performance and Enhanced Observability for Cold Observable Provider. These changes reduced redundant API calls, improved data freshness balance, and provided better error visibility and debuggability across reactive streams. No critical bugs reported; overall impact is improved performance, reliability, and maintainability.
November 2024
8 Commits • 4 Features
Nov 1, 2024November 2024: Delivered robustness and governance data enhancements for the cardano-js-sdk. Key work encompassed input resolution improvements, transaction/UTXO tracking refinements, a critical CIP-30 collateral handling fix, a governance data provider integration, and proactive dependency maintenance. These changes enhance reliability, performance, and business value for wallet users and governance features, while improving test coverage and developer experience.
8 Commits • 4 Features
Nov 1, 2024November 2024: Delivered robustness and governance data enhancements for the cardano-js-sdk. Key work encompassed input resolution improvements, transaction/UTXO tracking refinements, a critical CIP-30 collateral handling fix, a governance data provider integration, and proactive dependency maintenance. These changes enhance reliability, performance, and business value for wallet users and governance features, while improving test coverage and developer experience.
November 2024
October 2024
1 Commits
Oct 1, 2024Monthly summary for 2024-10 focusing on the input-output-hk/cardano-js-sdk work. Delivered a targeted bug fix to ensure correct Transaction ID computation in TxSubmitApiProvider by deriving the TXID from the signed transaction's CBOR encoding, ensuring accurate transaction submissions. Commit 09b6b6950f1dbb42545088733a303fe01ceec93c. Impact: increases reliability of transaction submissions, reduces potential duplicates and failed submissions in production integrations. Technologies demonstrated: TypeScript, CBOR encoding handling, and the transaction submission workflow. Business value: more trustworthy transaction lifecycle and smoother client integrations.
October 2024
1 Commits
Oct 1, 2024Monthly summary for 2024-10 focusing on the input-output-hk/cardano-js-sdk work. Delivered a targeted bug fix to ensure correct Transaction ID computation in TxSubmitApiProvider by deriving the TXID from the signed transaction's CBOR encoding, ensuring accurate transaction submissions. Commit 09b6b6950f1dbb42545088733a303fe01ceec93c. Impact: increases reliability of transaction submissions, reduces potential duplicates and failed submissions in production integrations. Technologies demonstrated: TypeScript, CBOR encoding handling, and the transaction submission workflow. Business value: more trustworthy transaction lifecycle and smoother client integrations.
Activity
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Quality Metrics
Correctness92.8%
Maintainability87.0%
Architecture84.6%
Performance84.8%
AI Usage20.4%
Skills & Technologies
Programming Languages
JavaScriptNixTypeScript
Technical Skills
API DesignAPI IntegrationAsynchronous ProgrammingBackend DevelopmentBlockchainCBORCBOR Encoding/DecodingCIP30CachingCardanoCardano DevelopmentCardano SDKCardano SerializationCryptocurrencyCryptography
Repositories Contributed To
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