October 2025 Lago API monthly summary focusing on business value and technical achievements across getlago/lago-api. Emphasis on robust billing capabilities, data integrity for invoicing, and test stability. Delivered a fixed charges lifecycle, explored data-snapshot approaches with a rollback path for performance, and improved test reliability in date calculations.

Month 2025-09: Delivered key fixed-charges billing enhancements in Lago API and performed API cleanup post-frontend migration. Implemented boundaries and amount integration for fixed charges in invoices/subscriptions, date-boundary calculations for one-time and recurring charges, and ensured accurate invoicing during subscription lifecycle (creation, ongoing billing with monthly splits, and termination). Also removed outdated InvoiceCustomSections code, simplifying Lago API and improving maintainability. Result: improved billing accuracy for fixed charges, streamlined billing logic, and a leaner API surface.

August 2025: Delivered foundational billing enhancements and deployment readiness across lago-api and lago. Key outcomes include: refactoring charge models into a dedicated ChargeModels namespace with a reusable ChargeablesValidationService for plan creation validation; implementing the fixed charges lifecycle for subscriptions and plans with GraphQL integration and child-charge support; enhancing Stripe payment descriptions to include invoice numbers for traceability; and aligning deployment readiness with coordinated version bumps and Docker image tag updates across api and frontend.

July 2025 monthly summary for getlago/lago-api focusing on business value and technical achievements in fixed-charge capabilities.

June 2025: Implemented cross-repo enhancements to support per-entity invoice customization across lago-api, lago-openapi, and lago-go-client. Delivered multi-entity capable Billing Entities invoice custom sections, aligning data models, API surfaces, and client libraries to enable scalable, tenant-specific billing configurations while reducing model complexity. Key outcomes include unified handling of invoice custom sections via codes, API-driven associations to Billing Entities, and updated schemas with deprecated paths clearly signaled for migration. The changes provide business value by enabling flexible, per-entity invoicing across organizations, streamlined configuration, and a cleaner, future-ready data model.

May 2025 performance snapshot for Lago suite. Delivered multi-entity billing capabilities across lago-api (REST and GraphQL) with entity-scoped invoices and centralized billing logic, enabling scalable multi-tenant billing workflows. Introduced Invoice Custom Sections per Billing Entity with GraphQL and migrations, enhancing per-entity customization. Improved payment processing reliability through webhook payload enhancements (lago_id, amount in cents, and currency) and tightened data integrity. Fixed critical concurrency issue in wallet balances by adding lock_version to wallet_transactions to prevent race conditions. Upgraded core tech stack and improved API UX: Rails upgraded to 8.0.2, API error messaging refinements, OpenAPI/schema updates, and Go module environment stabilization, plus release engineering milestones (v1.27.0 and v1.29.0 deployments with intermediate 1.28.1 bump and docker-compose tag updates).

April 2025: Implemented Multi-Entity Billing Core with BillingEntity as the single source of truth for invoices, templates, taxes, and EU tax management; introduced per-billing-entity sequential invoice IDs with data-integrity migrations; extended the Billing Entities API to include tax data and CRUD operations aligned with OpenAPI 3.1; stabilized Stripe payments by correcting payload construction and ensuring job-level uniqueness. These changes enable scalable multi-entity configurations for customers, reduce reconciliation effort, and provide a stronger API surface for tax data.

Concise monthly summary for 2025-03: Delivered significant backend enhancements across lago-api, focusing on security, performance, and multi-entity capabilities, with complementary deployment readiness for lago. Key outcomes include an upgrade to Rails 7.2 with updated dependencies, performance-oriented GraphQL refactors replacing count-based fields with has_* booleans, and a comprehensive multi-entity billing/invoicing overhaul that aligns billing entities to organization IDs, creates full-data billing entities, links customers, and supports multiple entities in invoicing with migrations. A targeted API/GraphQL service architecture split was implemented to decouple GraphQL and API flows, improving maintainability and readiness for multi-entity development. A regression-safe fix was applied to advanced invoices to handle a nil organization_id on Fees, with regression tests added to prevent recurrence. These efforts collectively improve security, DB efficiency, scalability to support larger customers, and deployment readiness for production releases.

February 2025 (2025-02) monthly summary for getlago/lago-api. Delivered core multi-entity billing capability and completed a Rails 7.2 upgrade, establishing groundwork for premium integrations and provisioning controls. Implemented governance safeguards and adjusted runtime to maintain stability and compatibility, positioning Lago for enterprise adoption and scalable invoicing.

January 2025 performance summary focusing on key accomplishments, major fixes, and business impact across Lago API and Lago OpenAPI. The team delivered enhanced partner revenue models, improved billing reliability, stronger API capabilities, and greater test stability, driving measurable business value and readiness for scale.

December 2024 — Lago API (getlago/lago-api): Delivered reliability and maintainability improvements focused on API integrity, webhook workflows, and background jobs. Key changes delivered: - Stripe webhook handling refactor: Extracted webhook logic into Stripe::HandleIncomingWebhookService, with WebhooksController delegating to the new service. This enhances code organization, testability, and future webhook evolution. (Commit 7bfd4a3bf1ac03ab612a80a393c4f50616ab0812). - API pagination consistency: Fixed duplicate results in API v1 index pagination by introducing query objects and explicit ordering (created_at DESC, id ASC), aligning with project standards and improving data reliability. (Commit bdb7668e9c05a18f85300a3127584568054f686f). - Prevented duplicate execution of Plans::DestroyJob: Ensured Plans::DestroyJob is queued only once to prevent race conditions and database constraint errors; subsequent queue attempts are logged and ignored. (Commit 59902a6279bb6f9559e0d41c7fc7300b347f1b3a). Overall impact and accomplishments: - Improved data integrity for API responses and asynchronous workflows, reducing duplicate results and erroneous duplicate deletions. - Enhanced maintainability and clarity of critical webhook and background job code, enabling faster future changes and safer deployments. Technologies/skills demonstrated: - Ruby on Rails service-oriented refactors, background job idempotency, explicit API pagination design, and testability improvements.

November 2024 focused on delivering end-to-end business value through automated dunning workflows, robust subscription upgrade handling, data export reliability, and enhanced query filtering validation. These efforts reduced billing churn risk, improved revenue recognition accuracy, and strengthened data integrity across core APIs and background processes.

Summary for 2024-10: Implemented end-to-end Dunning Campaign capabilities in getlago/lago-api, delivering automated dunning workflows, governance controls, and lifecycle/data integrity enhancements. The work enables hourly automated processing, organization-level defaults, and strict activation rules, delivering automation, reliability, and scalable collections across customers.