left-curve/left-curve
Dec 2024 – Oct 2025
11 Months active
Languages Used
RustSQLYAMLBorshGoGraphQLJSONTypeScript
Technical Skills
Asynchronous ProgrammingBackend DevelopmentBlockchainData PersistenceDatabaseDatabase Management
Fabien Penso
PROFILE
Fabien Penso
Over 11 months, this developer architected and delivered robust blockchain data infrastructure for the left-curve/left-curve repository, focusing on scalable indexing, real-time analytics, and deployment automation. They implemented SQL and ClickHouse-based indexers, integrated GraphQL APIs for efficient data access, and engineered a composable backend using Rust and Actix Web. Their work included automating CI/CD pipelines, enhancing observability with Sentry and Prometheus, and optimizing containerized deployments via Docker and Ansible. By refactoring core components, improving caching, and introducing advanced monitoring, they ensured high reliability and maintainability, enabling faster feature delivery and safer operations across distributed blockchain environments and data pipelines.
Overall Statistics
Feature vs Bugs
68%Features
Repository Contributions
287Total
Bugs
69
Commits
287
Features
145
Lines of code
86,297
Activity Months11
Your Network
7 peopleSame Organization
@pen.so1
Work History
October 2025
71 Commits • 37 Features
Oct 1, 2025During 2025-10, the left-curve project delivered key deployment, security, and observability enhancements across testnet environments, multi-node configurations, and GraphQL tooling, while stabilizing the deployment workflow and improving reliability. Notable outcomes include enabling testnet deployments, adding multi-node support, encrypting secrets in the repository, integrating GraphiQL UI with updated endpoints, and aligning Docker deployments with network identifiers via chain_id. These changes reduce time-to-value for new environments, strengthen data protection, and improve operator efficiency through better logging, caching, and deployment rituals.
71 Commits • 37 Features
Oct 1, 2025During 2025-10, the left-curve project delivered key deployment, security, and observability enhancements across testnet environments, multi-node configurations, and GraphQL tooling, while stabilizing the deployment workflow and improving reliability. Notable outcomes include enabling testnet deployments, adding multi-node support, encrypting secrets in the repository, integrating GraphiQL UI with updated endpoints, and aligning Docker deployments with network identifiers via chain_id. These changes reduce time-to-value for new environments, strengthen data protection, and improve operator efficiency through better logging, caching, and deployment rituals.
October 2025
September 2025
38 Commits • 15 Features
Sep 1, 2025September 2025 summary for left-curve/left-curve highlights increased data access reliability, safer and faster deployments, and improved operability. Delivered API/data access enhancements (trade cache, GraphQL routes, transaction storage details, Grug subscriptions); reinforced CI/CD with full-app PR deploys, deployment refactor, cleanup PRs, and workflow updates; added manual CometBFT docker build; tackled extensive deploy and build stability fixes (devnet/main deploys, Traefik removal, general deploy fixes); plus improved observability (JSON logs, preview app monitoring, docker labels). This work reduces release risk, accelerates feature delivery, and demonstrates expertise in GraphQL, caching, containerization, and release engineering.
September 2025
38 Commits • 15 Features
Sep 1, 2025September 2025 summary for left-curve/left-curve highlights increased data access reliability, safer and faster deployments, and improved operability. Delivered API/data access enhancements (trade cache, GraphQL routes, transaction storage details, Grug subscriptions); reinforced CI/CD with full-app PR deploys, deployment refactor, cleanup PRs, and workflow updates; added manual CometBFT docker build; tackled extensive deploy and build stability fixes (devnet/main deploys, Traefik removal, general deploy fixes); plus improved observability (JSON logs, preview app monitoring, docker labels). This work reduces release risk, accelerates feature delivery, and demonstrates expertise in GraphQL, caching, containerization, and release engineering.
August 2025
60 Commits • 30 Features
Aug 1, 2025August 2025 (2025-08) monthly summary for left-curve/left-curve. Focus this month was to boost reliability, performance, and observability across deployment workflows and data pipelines, enabling scalable operations and clearer telemetry for faster decision-making. Key features delivered: - Pub/Sub generalization: made pubsub more generic (commit e4f963e652938eea44d280dc7f5de5695dfec9fc). This paves the way for flexible topic routing and multi-tenant usage. - Reduce metrics cardinality: lowered cardinality to improve query performance and reduce storage costs (commit 94d97ace1214825ceaa654ec41cc8ca648de05f4). - Deploy workflow updates: modernized the deploy process to speed releases and reduce toil (commit fc0a55e159ef236a10ce41fc0ad9cc7c7a127f16). - Deploy-testnet entry: added a dedicated deploy-testnet entry for safer testing (commit 77be28d537ae7450b0e54acb206d2d1574b71d61). - Monitoring and runtime improvements: added Dozzle-based log viewing and migrated from runners; introduced postgres-exporter for DB visibility (commits 10d6a44b2d55e4ed4018ba6e161f1bd97c652054 and 747c0682bdce7c9038724cd947d75fe4fc9ac849; and the migration to Dozzle (57370c16750add3d5c1c60db7de8eaeb3b704550)). - Observability and analytics enhancements: expanded metrics/telemetry and analytics collection, including enhanced logging, and indexing for query performance (commits a53786869e3fab1ffb133f7e7fd2d8612938e0a3; 86c480412fa8d09b7db84a762ddfa025bd7d23a4; 491def1078a93fe8c1364ed1c03a7222f6c57876; 041150ecb2d00b05a7a2816ba17bdf0240a74c06). - Performance and memory optimizations: memory usage improvements for psql and ClickHouse, along with Prometheus memory warnings improvements (commits 0590d9bb7bed9b9efab525f8a68a166295e88965 and bb5313e6b2f5da903ac135b933fe4be06d9b4354). - Feature/configuration enhancements: added new operation type support, improved candle management and events, and introduced preview deployments for safer change validation (commits 5c8ed4260b634f603ebd185b7b1cc42b61c8e6e2; 03512cbf473572049a9dc9c24955fea90d27b098; a5dc6d334bd3e5837505c9ab066f8539285b53f7; 9bc1c894c60e7f5d17563392e93a2e8f5f0aef6a). Major bugs fixed: - Deploys stability: fixed deploys issue to ensure reliable deployments (commit f874b2500c36303d46035d87257dab00c3e03dad). - psql integration: fixed a psql error affecting startup and queries (commit b4202b5aa93f09a23d091011bed49005d72cb736). - Monitoring naming: renamed ovh3 in monitoring to reflect updated topology (commit 29da39c010e2a505effe77704f4a71c86acb648c). - File handling: fixed issues when files already exist during operations (commit 828fec6b2ec6166c459998f414a5d57beefef461). - Candle data integrity: addressed candle duplicates and price calculation issues, with related fixes (commits 5ee1bca5556968962b034e6b6d699c8fe3157082; d29c3372a64df3c3b9a830da88b4bcc714703936). Overall impact and accomplishments: - Significant uplift in deployment velocity and reliability, with safer testnet deployments and better live monitoring via Dozzle and postgres-exporter. - Substantial performance and cost benefits from reduced metrics cardinality, SQL indexing improvements, and memory optimizations for psql/ClickHouse. - Clearer telemetry, richer logs, and more actionable analytics enabling faster troubleshooting and data-driven decisions. Technologies and skills demonstrated: - Distributed systems patterns (generalized Pub/Sub), observability (metrics, logging, tracing), and performance tuning (memory optimization, SQL indexing). - Workflow automation and deployment reliability improvements, including testnet support and preview deployments. - Data pipeline robustness (ClickHouse candles, event-driven candles with OrdersMatched, and index relocation to dango directory).
60 Commits • 30 Features
Aug 1, 2025August 2025 (2025-08) monthly summary for left-curve/left-curve. Focus this month was to boost reliability, performance, and observability across deployment workflows and data pipelines, enabling scalable operations and clearer telemetry for faster decision-making. Key features delivered: - Pub/Sub generalization: made pubsub more generic (commit e4f963e652938eea44d280dc7f5de5695dfec9fc). This paves the way for flexible topic routing and multi-tenant usage. - Reduce metrics cardinality: lowered cardinality to improve query performance and reduce storage costs (commit 94d97ace1214825ceaa654ec41cc8ca648de05f4). - Deploy workflow updates: modernized the deploy process to speed releases and reduce toil (commit fc0a55e159ef236a10ce41fc0ad9cc7c7a127f16). - Deploy-testnet entry: added a dedicated deploy-testnet entry for safer testing (commit 77be28d537ae7450b0e54acb206d2d1574b71d61). - Monitoring and runtime improvements: added Dozzle-based log viewing and migrated from runners; introduced postgres-exporter for DB visibility (commits 10d6a44b2d55e4ed4018ba6e161f1bd97c652054 and 747c0682bdce7c9038724cd947d75fe4fc9ac849; and the migration to Dozzle (57370c16750add3d5c1c60db7de8eaeb3b704550)). - Observability and analytics enhancements: expanded metrics/telemetry and analytics collection, including enhanced logging, and indexing for query performance (commits a53786869e3fab1ffb133f7e7fd2d8612938e0a3; 86c480412fa8d09b7db84a762ddfa025bd7d23a4; 491def1078a93fe8c1364ed1c03a7222f6c57876; 041150ecb2d00b05a7a2816ba17bdf0240a74c06). - Performance and memory optimizations: memory usage improvements for psql and ClickHouse, along with Prometheus memory warnings improvements (commits 0590d9bb7bed9b9efab525f8a68a166295e88965 and bb5313e6b2f5da903ac135b933fe4be06d9b4354). - Feature/configuration enhancements: added new operation type support, improved candle management and events, and introduced preview deployments for safer change validation (commits 5c8ed4260b634f603ebd185b7b1cc42b61c8e6e2; 03512cbf473572049a9dc9c24955fea90d27b098; a5dc6d334bd3e5837505c9ab066f8539285b53f7; 9bc1c894c60e7f5d17563392e93a2e8f5f0aef6a). Major bugs fixed: - Deploys stability: fixed deploys issue to ensure reliable deployments (commit f874b2500c36303d46035d87257dab00c3e03dad). - psql integration: fixed a psql error affecting startup and queries (commit b4202b5aa93f09a23d091011bed49005d72cb736). - Monitoring naming: renamed ovh3 in monitoring to reflect updated topology (commit 29da39c010e2a505effe77704f4a71c86acb648c). - File handling: fixed issues when files already exist during operations (commit 828fec6b2ec6166c459998f414a5d57beefef461). - Candle data integrity: addressed candle duplicates and price calculation issues, with related fixes (commits 5ee1bca5556968962b034e6b6d699c8fe3157082; d29c3372a64df3c3b9a830da88b4bcc714703936). Overall impact and accomplishments: - Significant uplift in deployment velocity and reliability, with safer testnet deployments and better live monitoring via Dozzle and postgres-exporter. - Substantial performance and cost benefits from reduced metrics cardinality, SQL indexing improvements, and memory optimizations for psql/ClickHouse. - Clearer telemetry, richer logs, and more actionable analytics enabling faster troubleshooting and data-driven decisions. Technologies and skills demonstrated: - Distributed systems patterns (generalized Pub/Sub), observability (metrics, logging, tracing), and performance tuning (memory optimization, SQL indexing). - Workflow automation and deployment reliability improvements, including testnet support and preview deployments. - Data pipeline robustness (ClickHouse candles, event-driven candles with OrdersMatched, and index relocation to dango directory).
August 2025
July 2025
30 Commits • 11 Features
Jul 1, 2025July 2025 performance summary for left-curve/left-curve: delivered major backend enhancements enabling richer analytics, improved reliability, and stronger observability. Key outcomes include GraphQL API tuning for higher complexity, a composable indexer architecture with a standalone HTTP server, a ClickHouse indexer with increased scalability and access controls, Sentry integration with tests for error visibility, and extensive logging/observability improvements plus deployment reliability work, driving faster time-to-insight and safer deploys.
July 2025
30 Commits • 11 Features
Jul 1, 2025July 2025 performance summary for left-curve/left-curve: delivered major backend enhancements enabling richer analytics, improved reliability, and stronger observability. Key outcomes include GraphQL API tuning for higher complexity, a composable indexer architecture with a standalone HTTP server, a ClickHouse indexer with increased scalability and access controls, Sentry integration with tests for error visibility, and extensive logging/observability improvements plus deployment reliability work, driving faster time-to-insight and safer deploys.
June 2025
27 Commits • 15 Features
Jun 1, 2025Month: 2025-06 | Left Curve platform: Key features delivered, major bugs fixed, and overall impact focused on reliability, maintainability, and measurable business value. Highlights include account subscriptions filtering, robust account handling with fromAccount/toAccount fields, GraphQL tooling enhancements, and improved observability. These changes reduce data inconsistencies, improve user targeting, shorten debugging cycles, and enable safer deployments across the data pipeline and downstream systems.
27 Commits • 15 Features
Jun 1, 2025Month: 2025-06 | Left Curve platform: Key features delivered, major bugs fixed, and overall impact focused on reliability, maintainability, and measurable business value. Highlights include account subscriptions filtering, robust account handling with fromAccount/toAccount fields, GraphQL tooling enhancements, and improved observability. These changes reduce data inconsistencies, improve user targeting, shorten debugging cycles, and enable safer deployments across the data pipeline and downstream systems.
June 2025
May 2025
30 Commits • 18 Features
May 1, 2025May 2025: Strengthened CI/CD, automated deployments, and deployment resilience for left-curve. Focused on repeatable devnet/server provisioning, deploys reset, security and observability improvements, and readiness for testnet deployments and CometBFT operations. Business value: faster releases, fewer deploy failures, improved security and diagnosability, and stronger network testing capabilities.
May 2025
30 Commits • 18 Features
May 1, 2025May 2025: Strengthened CI/CD, automated deployments, and deployment resilience for left-curve. Focused on repeatable devnet/server provisioning, deploys reset, security and observability improvements, and readiness for testnet deployments and CometBFT operations. Business value: faster releases, fewer deploy failures, improved security and diagnosability, and stronger network testing capabilities.
April 2025
6 Commits • 5 Features
Apr 1, 2025April 2025 (2025-04): Delivered a set of features and tooling to improve production readiness, data processing reliability, and deployment efficiency. Highlights focus on observability, GraphQL tooling, SQL-based indexing, data processing refinements, and CI/CD automation.
6 Commits • 5 Features
Apr 1, 2025April 2025 (2025-04): Delivered a set of features and tooling to improve production readiness, data processing reliability, and deployment efficiency. Highlights focus on observability, GraphQL tooling, SQL-based indexing, data processing refinements, and CI/CD automation.
April 2025
March 2025
17 Commits • 10 Features
Mar 1, 2025During March 2025, the team delivered a set of strategic GraphQL, block data, and tooling enhancements that hardened data freshness, improved query performance, and expanded programmatic access to blockchain data. These changes provide stronger business value through faster analytics, more reliable data pipelines, and a scalable foundation for future growth, while advancing developer productivity with improved configuration and testing practices. Key outcomes include real-time GraphQL subscriptions for transactions, messages, and events complemented by DataLoader-based batching and support for nested events and optional block height queries, significantly reducing data fetch latency and query load. New block data endpoints enable programmatic retrieval of blocks and block results by height, opening automation and dashboards for monitoring and reporting. Blocks now expose a transactions_count metric, with migration logic to surface per-block activity. Storage was reorganized to store blocks in height-based subdirectories to improve scalability and write reliability. A new Dango CLI configuration system (app.toml + env vars) updates networking, indexer, and transaction parameter settings for a consistent dev/ops experience, reducing misconfigurations and deployment drift. In addition, reliability improvements in testing, including VAA data caching and retry tracing, contributed to more stable test runs under flaky conditions.
March 2025
17 Commits • 10 Features
Mar 1, 2025During March 2025, the team delivered a set of strategic GraphQL, block data, and tooling enhancements that hardened data freshness, improved query performance, and expanded programmatic access to blockchain data. These changes provide stronger business value through faster analytics, more reliable data pipelines, and a scalable foundation for future growth, while advancing developer productivity with improved configuration and testing practices. Key outcomes include real-time GraphQL subscriptions for transactions, messages, and events complemented by DataLoader-based batching and support for nested events and optional block height queries, significantly reducing data fetch latency and query load. New block data endpoints enable programmatic retrieval of blocks and block results by height, opening automation and dashboards for monitoring and reporting. Blocks now expose a transactions_count metric, with migration logic to surface per-block activity. Storage was reorganized to store blocks in height-based subdirectories to improve scalability and write reliability. A new Dango CLI configuration system (app.toml + env vars) updates networking, indexer, and transaction parameter settings for a consistent dev/ops experience, reducing misconfigurations and deployment drift. In addition, reliability improvements in testing, including VAA data caching and retry tracing, contributed to more stable test runs under flaky conditions.
February 2025
4 Commits • 2 Features
Feb 1, 2025February 2025 performance summary for left-curve/left-curve focusing on delivering real-time data capabilities, Tendermint integration, and reliability improvements. Key outcomes include real-time GraphQL subscriptions with a flexible pub/sub backend (in-memory or PostgreSQL), server refactors to support subscriptions, and Tendermint-related mutations/queries with improved CORS handling and integration with the indexer and HTTP server. A graceful shutdown fix for Ctrl-C was implemented using tokio::select! and CI runner updates moved to a self-hosted runner, enhancing stability of deployments and CI pipelines. These changes collectively improve data freshness for blocks/transfers, blockchain interoperability, and operational reliability.
4 Commits • 2 Features
Feb 1, 2025February 2025 performance summary for left-curve/left-curve focusing on delivering real-time data capabilities, Tendermint integration, and reliability improvements. Key outcomes include real-time GraphQL subscriptions with a flexible pub/sub backend (in-memory or PostgreSQL), server refactors to support subscriptions, and Tendermint-related mutations/queries with improved CORS handling and integration with the indexer and HTTP server. A graceful shutdown fix for Ctrl-C was implemented using tokio::select! and CI runner updates moved to a self-hosted runner, enhancing stability of deployments and CI pipelines. These changes collectively improve data freshness for blocks/transfers, blockchain interoperability, and operational reliability.
February 2025
January 2025
2 Commits • 1 Features
Jan 1, 2025Monthly work summary for 2025-01 focusing on delivering features and improving data access within the left-curve project. Highlights include a new SQL-based transfers sub-indexer and a GraphQL-enabled API for querying indexed blockchain data.
January 2025
2 Commits • 1 Features
Jan 1, 2025Monthly work summary for 2025-01 focusing on delivering features and improving data access within the left-curve project. Highlights include a new SQL-based transfers sub-indexer and a GraphQL-enabled API for querying indexed blockchain data.
December 2024
2 Commits • 1 Features
Dec 1, 2024December 2024: Delivered a durable Grug Blockchain Indexing System in left-curve/left-curve by introducing a SQL-based indexer and on-disk persistence. Refactored core components to integrate the indexer, added migrations to support persistent indexing, and established on-disk caching/storage for blocks. This enables scalable blockchain analytics, faster query performance, and reliable data durability for long-term insights.
2 Commits • 1 Features
Dec 1, 2024December 2024: Delivered a durable Grug Blockchain Indexing System in left-curve/left-curve by introducing a SQL-based indexer and on-disk persistence. Refactored core components to integrate the indexer, added migrations to support persistent indexing, and established on-disk caching/storage for blocks. This enables scalable blockchain analytics, faster query performance, and reliable data durability for long-term insights.
December 2024
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Quality Metrics
Correctness86.6%
Maintainability85.6%
Architecture83.4%
Performance78.6%
AI Usage23.0%
Skills & Technologies
Programming Languages
BashBorshCSSDockerfileGoGraphQLHTMLJSONJavaScriptJinja2
Technical Skills
API DesignAPI DevelopmentAPI IntegrationActixActix WebActix-webAlertingAnsibleAsync ProgrammingAsync-RustAsync-graphqlAsynchronous ProgrammingAutomationBackend DevelopmentBlockchain
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline