openmeterio/openmeter
Feb 2026 – Apr 2026
3 Months active
Languages Used
JSONGo
Technical Skills
API DevelopmentNode.jsOpenAPI SpecificationAPI developmentBackend DevelopmentGo
Mark Vass
PROFILE
Mark Vass
Over a three-month period, contributed to the openmeterio/openmeter repository by building and enhancing core billing and currency management APIs. Developed new API specifications and database schemas in Go to support multi-currency operations, custom currencies, and flexible settlement modes for subscriptions and billing. Expanded the API surface to enable credit-based billing and automated charge management, reducing manual intervention and improving revenue recognition. Enhanced observability by migrating telemetry to a Go tracer and refining logging for DataDog compatibility. Focused on robust API design, versioning, and backend development, with careful attention to schema migrations, validation, and collaboration across the engineering team.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
12Total
Bugs
0
Commits
12
Features
5
Lines of code
24,872
Activity Months3
Your Network
95 peopleShared Repositories
12
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Peter TuriMember
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Robert BorosMember
borbelyr-kongMember
Robert BorosMember
Work History
April 2026
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for openmeter project.
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for openmeter project.
April 2026
March 2026
9 Commits • 3 Features
Mar 1, 2026Month: 2026-03 — concise monthly summary highlighting key product delivery, reliability improvements, and technical craftsmanship that drove business value for openmeter. Key features delivered: - Custom Currencies Management: Implemented a new database schema for custom currencies, added cost bases, and exposed v3 currencies API endpoints to create/list currencies and their cost bases. (Commits: cff5aa957e25429fcdd95c848b7781e9462cc147; 02cd2a7b2f28a3943f8e5cd531c981c6a156db58; e1ac49a0f74de98c88dc5559371b6d35e8e670d1) - Flexible Settlement Modes for Subscriptions and Billing: Introduced settlement modes across subscriptions and plans (invoice_only, credit_then_invoice, credit_only) with schema changes, mutations, migrations, and API exposure. (Commits: 37d4d5e335eabbe95a34698c19f745d66657e8d7; b4841895aa2c11dff1623e2ad356ea1bf70728af; 4f0bb0b1e0f61abc95b8d31fd2f3be0335bc0fee; e17c230acd1e1d6569551305e4194f456d12eddb) - Observability and Telemetry Enhancements: Migrated telemetry to a Go tracer, disabled default Prometheus collectors when needed, and refactored logging for better error reporting and DataDog compatibility. (Commits: 97454e761b132dd657c98f5a970678bdaec441f8; 5f58faa33dbe0d09a739b4a3681f5bea1ce68ce1) Major bugs fixed: - Cost-basis list API handler fixed to ensure correct retrieval and listing of cost bases for currencies. (Commit: e1ac49a0f74de98c88dc5559371b6d35e8e670d1) Overall impact and accomplishments: - Delivered end-to-end capabilities for currency customization and flexible billing flows, enabling more accurate multi-currency pricing and adaptable revenue recognition. Expanded API surface and internal types to support new settlement semantics, reducing friction for feature adoption across customers. Improved reliability and observability, leading to faster issue detection and better operator experience. Technologies/skills demonstrated: - Go, database migrations and schema design, API design and versioning (v3 currencies, v1 settlement mode), internal type systems, telemetry instrumentation with Go tracer, Prometheus interaction, DataDog-compatible logging.
March 2026
9 Commits • 3 Features
Mar 1, 2026Month: 2026-03 — concise monthly summary highlighting key product delivery, reliability improvements, and technical craftsmanship that drove business value for openmeter. Key features delivered: - Custom Currencies Management: Implemented a new database schema for custom currencies, added cost bases, and exposed v3 currencies API endpoints to create/list currencies and their cost bases. (Commits: cff5aa957e25429fcdd95c848b7781e9462cc147; 02cd2a7b2f28a3943f8e5cd531c981c6a156db58; e1ac49a0f74de98c88dc5559371b6d35e8e670d1) - Flexible Settlement Modes for Subscriptions and Billing: Introduced settlement modes across subscriptions and plans (invoice_only, credit_then_invoice, credit_only) with schema changes, mutations, migrations, and API exposure. (Commits: 37d4d5e335eabbe95a34698c19f745d66657e8d7; b4841895aa2c11dff1623e2ad356ea1bf70728af; 4f0bb0b1e0f61abc95b8d31fd2f3be0335bc0fee; e17c230acd1e1d6569551305e4194f456d12eddb) - Observability and Telemetry Enhancements: Migrated telemetry to a Go tracer, disabled default Prometheus collectors when needed, and refactored logging for better error reporting and DataDog compatibility. (Commits: 97454e761b132dd657c98f5a970678bdaec441f8; 5f58faa33dbe0d09a739b4a3681f5bea1ce68ce1) Major bugs fixed: - Cost-basis list API handler fixed to ensure correct retrieval and listing of cost bases for currencies. (Commit: e1ac49a0f74de98c88dc5559371b6d35e8e670d1) Overall impact and accomplishments: - Delivered end-to-end capabilities for currency customization and flexible billing flows, enabling more accurate multi-currency pricing and adaptable revenue recognition. Expanded API surface and internal types to support new settlement semantics, reducing friction for feature adoption across customers. Improved reliability and observability, leading to faster issue detection and better operator experience. Technologies/skills demonstrated: - Go, database migrations and schema design, API design and versioning (v3 currencies, v1 settlement mode), internal type systems, telemetry instrumentation with Go tracer, Prometheus interaction, DataDog-compatible logging.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02): Implemented Currency Data API Enhancement by adding the currencies v3 API spec, enabling currency-related operations and laying groundwork for currency conversion and multi-currency reporting. No major bugs reported this month; changes shipped with a clear API spec and commit history. Business impact: Expanded API capabilities for financial data, opening new use-cases and potential revenue opportunities; technical impact: API design, versioning, and collaboration.
1 Commits • 1 Features
Feb 1, 2026February 2026 (2026-02): Implemented Currency Data API Enhancement by adding the currencies v3 API spec, enabling currency-related operations and laying groundwork for currency conversion and multi-currency reporting. No major bugs reported this month; changes shipped with a clear API spec and commit history. Business impact: Expanded API capabilities for financial data, opening new use-cases and potential revenue opportunities; technical impact: API design, versioning, and collaboration.
February 2026
Activity
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Quality Metrics
Correctness90.0%
Maintainability80.0%
Architecture83.4%
Performance80.0%
AI Usage36.8%
Skills & Technologies
Programming Languages
GoJSON
Technical Skills
API DevelopmentAPI developmentBackend DevelopmentGoNode.jsOpenAPI SpecificationOpenTelemetryTestingbackend developmentbilling systemsdatabase designent frameworkentgologgingtelemetry
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline