comet-ml/opik
Oct 2024 – Apr 2026
19 Months active
Languages Used
JavaSQLShellMarkdownYAMLJavaScriptPythonTypeScript
Technical Skills
API DevelopmentBackend DevelopmentClickHouseDatabase DesignDatabase InteractionDatabase Management
Thiago dos Santos Hora
PROFILE
Thiago Dos Santos Hora
Thiago H built and evolved the backend for comet-ml/opik, delivering robust data analytics, observability, and scalable API workflows. He engineered features such as denormalized experiment metrics, dataset export pipelines with S3 multipart uploads, and end-to-end feedback scoring, using Java, Spring Boot, and ClickHouse. His work included asynchronous processing with Redis, OpenTelemetry-based tracing, and resilient query optimization for high-throughput analytics. Thiago integrated frontend and backend changes for traceability, implemented project-scoped governance, and maintained strong test coverage with Testcontainers and integration tests. The depth of his engineering addressed performance, reliability, and maintainability, enabling faster analytics and safer, more scalable deployments.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
371Total
Bugs
69
Commits
371
Features
168
Lines of code
358,947
Activity Months19
Your Network
92 peopleSame Organization
@comet.com20
Shared Repositories
72
Work History
April 2026
7 Commits • 3 Features
Apr 1, 2026April 2026 highlights for comet-ml/opik: Delivered performance and reliability improvements across core data views and streaming endpoints, enabling faster analytics, reduced query costs, and more resilient data delivery. Implemented robust thread view loading with bloom-filter-based thread_id lookups, introduced skip-index optimizations in traces to dramatically reduce data scans, and refined loading UX. Optimized project metrics queries by scoping subqueries to filtered traces, resulting in ~5x fewer granule reads and measurable latency improvements in production. Strengthened dataset and experiment streaming by adding workspace-wide fallbacks and a deprecation header, ensuring continued data access when project names are misconfigured or datasets are deleted. Fixed DICTIONARY-based filtering semantics (IS_EMPTY/IS_NOT_EMPTY) and ensured correct scoping when grouping experiments by tags. These changes improve accuracy, stability, and business-value through faster analytics, safer streaming, and fewer user-visible errors.
7 Commits • 3 Features
Apr 1, 2026April 2026 highlights for comet-ml/opik: Delivered performance and reliability improvements across core data views and streaming endpoints, enabling faster analytics, reduced query costs, and more resilient data delivery. Implemented robust thread view loading with bloom-filter-based thread_id lookups, introduced skip-index optimizations in traces to dramatically reduce data scans, and refined loading UX. Optimized project metrics queries by scoping subqueries to filtered traces, resulting in ~5x fewer granule reads and measurable latency improvements in production. Strengthened dataset and experiment streaming by adding workspace-wide fallbacks and a deprecation header, ensuring continued data access when project names are misconfigured or datasets are deleted. Fixed DICTIONARY-based filtering semantics (IS_EMPTY/IS_NOT_EMPTY) and ensured correct scoping when grouping experiments by tags. These changes improve accuracy, stability, and business-value through faster analytics, safer streaming, and fewer user-visible errors.
April 2026
March 2026
31 Commits • 9 Features
Mar 1, 2026March 2026 performance summary for the Opik backend: delivered a robust denormalized metrics platform with improved scalability, reliability, and project-scoped governance. Highlights include a complete denormalized metrics pipeline for experiment analytics, a Redis-based debounced recomputation flow, resilience enhancements for concurrency, targeted query-path optimizations using pre-computed aggregations, and reinforced project-scoping for datasets, prompts, and dashboards.
March 2026
31 Commits • 9 Features
Mar 1, 2026March 2026 performance summary for the Opik backend: delivered a robust denormalized metrics platform with improved scalability, reliability, and project-scoped governance. Highlights include a complete denormalized metrics pipeline for experiment analytics, a Redis-based debounced recomputation flow, resilience enhancements for concurrency, targeted query-path optimizations using pre-computed aggregations, and reinforced project-scoping for datasets, prompts, and dashboards.
February 2026
15 Commits • 7 Features
Feb 1, 2026February 2026 (OPIK): Delivered a set of high-impact UX, performance, analytics, and reliability improvements across the opik repository, driving faster analytics, more resilient operations, and better data integrity. Work spanned FE, BE, and SDK layers, with a focus on business value through faster queries, richer analytics, and safer deployments.
15 Commits • 7 Features
Feb 1, 2026February 2026 (OPIK): Delivered a set of high-impact UX, performance, analytics, and reliability improvements across the opik repository, driving faster analytics, more resilient operations, and better data integrity. Work spanned FE, BE, and SDK layers, with a focus on business value through faster queries, richer analytics, and safer deployments.
February 2026
January 2026
23 Commits • 12 Features
Jan 1, 2026January 2026 (OPIK) delivered a robust end-to-end dataset export workflow, improved data governance, and strengthened export reliability while enabling business value through scalable data delivery and UI integration.
January 2026
23 Commits • 12 Features
Jan 1, 2026January 2026 (OPIK) delivered a robust end-to-end dataset export workflow, improved data governance, and strengthened export reliability while enabling business value through scalable data delivery and UI integration.
December 2025
4 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for comet-ml/opik focusing on delivering end-to-end Span Feedback Scores, enhancing trace/spans quality visibility, and strengthening test stability. The work delivered combines backend data aggregation, frontend presentation, ML-based evaluators, and robust test/CI hygiene to drive data-driven improvements in product quality and reliability.
4 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for comet-ml/opik focusing on delivering end-to-end Span Feedback Scores, enhancing trace/spans quality visibility, and strengthening test stability. The work delivered combines backend data aggregation, frontend presentation, ML-based evaluators, and robust test/CI hygiene to drive data-driven improvements in product quality and reliability.
December 2025
November 2025
20 Commits • 5 Features
Nov 1, 2025Delivered end-to-end UUIDv7 time-based filtering across traces, spans, trace threads, and project metrics (OPIK-2856), with coordinated changes across API, DAO, UI, and tests. Implemented time-bound filtering bounds via InstantToUUIDMapper and InstantParamConverter, including boundary semantics with ±1ms for precise BETWEEN queries and improved error handling. UI integration with datetime picker support for from_time/to_time on traces endpoints, plus comprehensive integration tests ensuring correctness across boundary cases. Enhanced test infrastructure and framework reliability with MySQL Testcontainers upgrades and Dropwizard 5.0.0 / Jetty/CORS upgrades, along with refactored test utilities and streamlined test clients to reduce duplication and race conditions. These changes deliver faster, more accurate analytics, improved traceability, and a more reliable deployment/testing pipeline.
November 2025
20 Commits • 5 Features
Nov 1, 2025Delivered end-to-end UUIDv7 time-based filtering across traces, spans, trace threads, and project metrics (OPIK-2856), with coordinated changes across API, DAO, UI, and tests. Implemented time-bound filtering bounds via InstantToUUIDMapper and InstantParamConverter, including boundary semantics with ±1ms for precise BETWEEN queries and improved error handling. UI integration with datetime picker support for from_time/to_time on traces endpoints, plus comprehensive integration tests ensuring correctness across boundary cases. Enhanced test infrastructure and framework reliability with MySQL Testcontainers upgrades and Dropwizard 5.0.0 / Jetty/CORS upgrades, along with refactored test utilities and streamlined test clients to reduce duplication and race conditions. These changes deliver faster, more accurate analytics, improved traceability, and a more reliable deployment/testing pipeline.
October 2025
10 Commits • 8 Features
Oct 1, 2025October 2025: Delivered a proactive set of reliability, observability, and performance improvements across the opik backend and demo data generation. Enhanced observability and thread-safety for data generation, accelerated endpoint verification, hardened asynchronous processing, and improved alerting workflows. Strengthened cross-language async job processing, and introduced isolated subprocess execution with robust monitoring.
10 Commits • 8 Features
Oct 1, 2025October 2025: Delivered a proactive set of reliability, observability, and performance improvements across the opik backend and demo data generation. Enhanced observability and thread-safety for data generation, accelerated endpoint verification, hardened asynchronous processing, and improved alerting workflows. Strengthened cross-language async job processing, and introduced isolated subprocess execution with robust monitoring.
October 2025
September 2025
22 Commits • 15 Features
Sep 1, 2025September 2025 (2025-09) monthly summary for comet-ml/opik. Key features delivered span observability, data quality, security, and performance: Frontend observability was enhanced with OpenTelemetry log shipping; backend reliability and data integrity were strengthened through a data ingestion-time truncation approach and Redis-related improvements; demo data and tests were added to support realistic usage scenarios; and batch processes were refined to boost throughput. Significant bug fixes include resolving a HTTP 500 caused by ValidationErrorMessage serialization in streaming endpoints and ensuring usage/daily reports properly exclude demo data. The work demonstrates strong cross-functional collaboration between BE and FE, robust testing, and careful data governance. Technologies and skills demonstrated include OpenTelemetry, Redis with Redisson IAM auth, Python backend metrics and retry logic, batch APIs, multi-threading, data ingestion optimizations, end-to-end observability, and Docker logging improvements.
September 2025
22 Commits • 15 Features
Sep 1, 2025September 2025 (2025-09) monthly summary for comet-ml/opik. Key features delivered span observability, data quality, security, and performance: Frontend observability was enhanced with OpenTelemetry log shipping; backend reliability and data integrity were strengthened through a data ingestion-time truncation approach and Redis-related improvements; demo data and tests were added to support realistic usage scenarios; and batch processes were refined to boost throughput. Significant bug fixes include resolving a HTTP 500 caused by ValidationErrorMessage serialization in streaming endpoints and ensuring usage/daily reports properly exclude demo data. The work demonstrates strong cross-functional collaboration between BE and FE, robust testing, and careful data governance. Technologies and skills demonstrated include OpenTelemetry, Redis with Redisson IAM auth, Python backend metrics and retry logic, batch APIs, multi-threading, data ingestion optimizations, end-to-end observability, and Docker logging improvements.
August 2025
19 Commits • 5 Features
Aug 1, 2025August 2025 summary for comet-ml/opik: Delivered meaningful capacity, reliability, and observability improvements across ingestion, scoring, and deployment. Key features include asynchronous inserts for ClickHouse across all DAOs with tests and default enablement, Python scoring performance optimizations (prewarm, lazy imports, improved error handling), OpenTelemetry-based telemetry and metrics instrumentation with default metrics enabled and consistent anonymous IDs, and Docker/packaging optimizations (multi-stage builds, size reductions, Windows build fixes). Demo data expansion supported testing and demos. Major bug fixes addressed dataset API correctness under item deletion and improved Python backend test robustness; cleanup of async insert configuration was performed to maintain a clean state. These efforts collectively improved ingestion throughput under heavy load, reliability of scoring, and deployment efficiency, delivering tangible business value and stronger maintainability.
19 Commits • 5 Features
Aug 1, 2025August 2025 summary for comet-ml/opik: Delivered meaningful capacity, reliability, and observability improvements across ingestion, scoring, and deployment. Key features include asynchronous inserts for ClickHouse across all DAOs with tests and default enablement, Python scoring performance optimizations (prewarm, lazy imports, improved error handling), OpenTelemetry-based telemetry and metrics instrumentation with default metrics enabled and consistent anonymous IDs, and Docker/packaging optimizations (multi-stage builds, size reductions, Windows build fixes). Demo data expansion supported testing and demos. Major bug fixes addressed dataset API correctness under item deletion and improved Python backend test robustness; cleanup of async insert configuration was performed to maintain a clean state. These efforts collectively improved ingestion throughput under heavy load, reliability of scoring, and deployment efficiency, delivering tangible business value and stronger maintainability.
August 2025
July 2025
28 Commits • 15 Features
Jul 1, 2025July 2025 monthly summary for comet-ml/opik focusing on delivering automated thread lifecycle management, scalable scoring, cost optimization, reliability improvements, and runtime performance enhancements. The work accelerates decision-making, reduces operational overhead, and improves reliability for users and customers.
July 2025
28 Commits • 15 Features
Jul 1, 2025July 2025 monthly summary for comet-ml/opik focusing on delivering automated thread lifecycle management, scalable scoring, cost optimization, reliability improvements, and runtime performance enhancements. The work accelerates decision-making, reduces operational overhead, and improves reliability for users and customers.
June 2025
36 Commits • 16 Features
Jun 1, 2025June 2025 – comet-ml/opik: Delivered significant UX and performance improvements with a strong emphasis on data discovery, observability, and scalable operations. Key features shipped include thread table sorting across all columns, evaluate task result column with validation, container warm-up and asynchronous release, trace visibility mode with filtering, and scheduler-driven pool management with pool size metrics. Infrastructure work introduced trace thread tables and enhanced error stats/filters for traces and spans, while thread lifecycle and operational endpoints were expanded to support manual thread control and post-merge follow-ups. On the data layer, span table optimization and pre-calculated fields reduced query costs. These changes collectively improve developer velocity, reduce latency, and increase system reliability.
36 Commits • 16 Features
Jun 1, 2025June 2025 – comet-ml/opik: Delivered significant UX and performance improvements with a strong emphasis on data discovery, observability, and scalable operations. Key features shipped include thread table sorting across all columns, evaluate task result column with validation, container warm-up and asynchronous release, trace visibility mode with filtering, and scheduler-driven pool management with pool size metrics. Infrastructure work introduced trace thread tables and enhanced error stats/filters for traces and spans, while thread lifecycle and operational endpoints were expanded to support manual thread control and post-merge follow-ups. On the data layer, span table optimization and pre-calculated fields reduced query costs. These changes collectively improve developer velocity, reduce latency, and increase system reliability.
June 2025
May 2025
25 Commits • 11 Features
May 1, 2025May 2025 highlights for comet-ml/opik: Delivered substantive feature work and reliability improvements that enhance performance, scalability, and external integrations. Key deliveries include improved experiment query and replication across the optimization endpoint, enabling faster experiment discovery and more consistent results. Ingestion path was accelerated by adding a pre-computed column to reduce aggregations overhead. Vertex AI Gemini integration is now supported across Playground and online scoring, with robustness fixes for location handling and missing user/AI messages. OpenAI LLM provider configuration was enhanced with base URL and custom headers, plus error routing to improve reliability of external calls. LangChain mapper validation was added to boost input validation and prevent misconfigurations. Final changes include observability and quality improvements such as base URL handling after a library upgrade, error handling for unknown fields, RateLimit-Reset header, Otel upgrade, Fern generators test upgrade, and Autogen code updates. Overall, these efforts improve performance, reliability, and developer productivity while expanding AI integrations and observability.
May 2025
25 Commits • 11 Features
May 1, 2025May 2025 highlights for comet-ml/opik: Delivered substantive feature work and reliability improvements that enhance performance, scalability, and external integrations. Key deliveries include improved experiment query and replication across the optimization endpoint, enabling faster experiment discovery and more consistent results. Ingestion path was accelerated by adding a pre-computed column to reduce aggregations overhead. Vertex AI Gemini integration is now supported across Playground and online scoring, with robustness fixes for location handling and missing user/AI messages. OpenAI LLM provider configuration was enhanced with base URL and custom headers, plus error routing to improve reliability of external calls. LangChain mapper validation was added to boost input validation and prevent misconfigurations. Final changes include observability and quality improvements such as base URL handling after a library upgrade, error handling for unknown fields, RateLimit-Reset header, Otel upgrade, Fern generators test upgrade, and Autogen code updates. Overall, these efforts improve performance, reliability, and developer productivity while expanding AI integrations and observability.
April 2025
23 Commits • 9 Features
Apr 1, 2025April 2025 (2025-04) was a strong month for opik, delivering impactful feature work, performance improvements, and expanded observability across comet-ml/opik. Key user-facing capabilities were introduced and data pipelines were sharpened to drive faster, more reliable trace analytics and BI insights. The team also advanced deployment hygiene and release readiness to reduce operational risk. Highlights include sorting enhancements for feedback scores on traces and spans, performance optimizations for query execution, and expanded analytics endpoints for decision-making. Observability and BI instrumentation were strengthened with installation reports and activation BI events, enabling better onboarding and actionable metrics for stakeholders. In addition, payload optimizations and deployment hygiene improvements improved data transfer efficiency and release quality.
23 Commits • 9 Features
Apr 1, 2025April 2025 (2025-04) was a strong month for opik, delivering impactful feature work, performance improvements, and expanded observability across comet-ml/opik. Key user-facing capabilities were introduced and data pipelines were sharpened to drive faster, more reliable trace analytics and BI insights. The team also advanced deployment hygiene and release readiness to reduce operational risk. Highlights include sorting enhancements for feedback scores on traces and spans, performance optimizations for query execution, and expanded analytics endpoints for decision-making. Observability and BI instrumentation were strengthened with installation reports and activation BI events, enabling better onboarding and actionable metrics for stakeholders. In addition, payload optimizations and deployment hygiene improvements improved data transfer efficiency and release quality.
April 2025
March 2025
25 Commits • 12 Features
Mar 1, 2025March 2025 (2025-03) monthly summary for comet-ml/opik focused on reliability, UX improvements, data governance, and performance optimizations. Delivered new backend capabilities and API endpoints, enhanced startup and onboarding, and implemented sorting and control features for better data analysis and scalability. Core reliability improvements reduced initialization latency and improved test stability, while the new endpoints and controls expanded product capabilities and governance of workspace usage. The month also included targeted bug fixes to improve correctness, health reporting, and payload handling, along with startup and documentation updates to streamline adoption.
March 2025
25 Commits • 12 Features
Mar 1, 2025March 2025 (2025-03) monthly summary for comet-ml/opik focused on reliability, UX improvements, data governance, and performance optimizations. Delivered new backend capabilities and API endpoints, enhanced startup and onboarding, and implemented sorting and control features for better data analysis and scalability. Core reliability improvements reduced initialization latency and improved test stability, while the new endpoints and controls expanded product capabilities and governance of workspace usage. The month also included targeted bug fixes to improve correctness, health reporting, and payload handling, along with startup and documentation updates to streamline adoption.
February 2025
19 Commits • 4 Features
Feb 1, 2025February 2025: Key performance, data integrity, and API enhancements for opik. Delivered JVM tuning for performance, enforced trace data integrity in ClickHouse, expanded trace-thread capabilities with new APIs, and strengthened data consistency and error handling across projects. These changes improve stability under load, accuracy of trace analytics, and observability for governance of trace data.
19 Commits • 4 Features
Feb 1, 2025February 2025: Key performance, data integrity, and API enhancements for opik. Delivered JVM tuning for performance, enforced trace data integrity in ClickHouse, expanded trace-thread capabilities with new APIs, and strengthened data consistency and error handling across projects. These changes improve stability under load, accuracy of trace analytics, and observability for governance of trace data.
February 2025
January 2025
19 Commits • 6 Features
Jan 1, 2025Month: 2025-01 — Delivered targeted performance, reliability, and observation improvements for comet-ml/opik, focusing on caching, observability, LLM workflows, and API/data UX. Implementations span Redis-backed caching for automation rule evaluators, enhanced logging with a dedicated rule-evaluation logs table and a ClickHouse backend, streaming-span search, multi-provider LLM support, Mustache-based template rendering, and richer project/span endpoints. Also addressed data integrity and stability with serialization fixes and deduplication fixes, plus ongoing telemetry and performance optimizations.
January 2025
19 Commits • 6 Features
Jan 1, 2025Month: 2025-01 — Delivered targeted performance, reliability, and observation improvements for comet-ml/opik, focusing on caching, observability, LLM workflows, and API/data UX. Implementations span Redis-backed caching for automation rule evaluators, enhanced logging with a dedicated rule-evaluation logs table and a ClickHouse backend, streaming-span search, multi-provider LLM support, Mustache-based template rendering, and richer project/span endpoints. Also addressed data integrity and stability with serialization fixes and deduplication fixes, plus ongoing telemetry and performance optimizations.
December 2024
11 Commits • 7 Features
Dec 1, 2024December 2024 monthly summary for comet-ml/opik: Delivered substantial API robustness, analytics, and cost visibility improvements across the project. Key outcomes include stability improvements in Redis connections and API ID parsing; a daily usage reporting system with dedupe safeguards; duration-based metrics with project-level aggregations; a new Dataset Output Columns API; and cost estimation for traces/spans, plus observability and query optimization enhancements. These changes reduce operational risk, enable better customer analytics, and improve performance for multi-project deployments.
11 Commits • 7 Features
Dec 1, 2024December 2024 monthly summary for comet-ml/opik: Delivered substantial API robustness, analytics, and cost visibility improvements across the project. Key outcomes include stability improvements in Redis connections and API ID parsing; a daily usage reporting system with dedupe safeguards; duration-based metrics with project-level aggregations; a new Dataset Output Columns API; and cost estimation for traces/spans, plus observability and query optimization enhancements. These changes reduce operational risk, enable better customer analytics, and improve performance for multi-project deployments.
December 2024
November 2024
27 Commits • 19 Features
Nov 1, 2024November 2024 highlights for comet-ml/opik: Delivered a comprehensive Prompt API surface with endpoints for creating, fetching, updating, and deleting prompts, plus versioning and retrieval capabilities. Enabled experiment linkage for prompts and enhanced filtering by prompt IDs across datasets and experiments. Upgraded observability with OpenTelemetry and introduced trace/spans stats endpoints. Improved reliability through rate limiter initialization fix and stability work (Redis lock keys, flaky tests, null pointer). This work delivers clear business value by accelerating model prompt management, enabling better experimentation, and improving system resilience.
November 2024
27 Commits • 19 Features
Nov 1, 2024November 2024 highlights for comet-ml/opik: Delivered a comprehensive Prompt API surface with endpoints for creating, fetching, updating, and deleting prompts, plus versioning and retrieval capabilities. Enabled experiment linkage for prompts and enhanced filtering by prompt IDs across datasets and experiments. Upgraded observability with OpenTelemetry and introduced trace/spans stats endpoints. Improved reliability through rate limiter initialization fix and stability work (Redis lock keys, flaky tests, null pointer). This work delivers clear business value by accelerating model prompt management, enabling better experimentation, and improving system resilience.
October 2024
7 Commits • 4 Features
Oct 1, 2024October 2024 monthly summary for comet-ml/opik focused on delivering durable data-model evolutions, improved observability, and API enhancements that enable safer data governance and better discovery. The work emphasized backfill-ready migrations, event-driven metadata updates, versioned prompt storage, and targeted filtering to surface datasets with experiments, driving reliability and business value.
7 Commits • 4 Features
Oct 1, 2024October 2024 monthly summary for comet-ml/opik focused on delivering durable data-model evolutions, improved observability, and API enhancements that enable safer data governance and better discovery. The work emphasized backfill-ready migrations, event-driven metadata updates, versioned prompt storage, and targeted filtering to surface datasets with experiments, driving reliability and business value.
October 2024
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Quality Metrics
Correctness90.2%
Maintainability85.2%
Architecture86.2%
Performance81.8%
AI Usage27.8%
Skills & Technologies
Programming Languages
BashDockerfileGroovyINIJSONJUnitJavaJavaScriptKotlinMarkdown
Technical Skills
AI IntegrationAPI ConfigurationAPI DesignAPI DevelopmentAPI IntegrationAPI TestingAPI developmentAPI integrationAPI testingAWSAWS S3Asynchronous ProcessingAsynchronous ProgrammingAwaitilityBI Event Tracking
Repositories Contributed To
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