kivitendo/kivitendo-erp
Jun 2023 – Jan 2026
14 Months active
Languages Used
HTMLPerlMarkdownPHPJavaScriptSQLUnknownPlain text
Technical Skills
HTMLPerlbackend developmentfrontend developmentback end developmentdatabase management
Jan Büren
PROFILE
Jan Büren
Over 14 months, contributed to the kivitendo/kivitendo-erp repository by delivering 37 features and resolving 20 bugs, focusing on business-critical workflows such as bank reconciliation, invoicing, and email integration. Applied Perl, SQL, and HTML to enhance backend reliability, optimize database queries, and improve frontend usability. Work included implementing SEPA and SWIFT banking standards, refining authentication and user lifecycle management, and strengthening security for XML and SMTP processes. Emphasized maintainability through code refactoring, documentation updates, and localization improvements. Prioritized data integrity, regulatory compliance, and user experience, consistently validating changes with automated tests and clear commit traceability across complex financial software.
Overall Statistics
Feature vs Bugs
65%Features
Repository Contributions
92Total
Bugs
20
Commits
92
Features
37
Lines of code
1,406
Activity Months14
Your Network
21 peopleSame Organization
@kivitendo.de1
Shared Repositories
20
Work History
January 2026
3 Commits • 1 Features
Jan 1, 2026January 2026: Delivered security-focused SMTP enhancements to kivitendo-erp, reinforcing SSL usage for all SMTP transmissions, validating SASL mechanisms for SMTP authentication, and documenting the libauthen-sasl-perl dependency required for Debian 13. This work improves email reliability, reduces risk of credential compromise, and aligns with OS-packaging requirements.
3 Commits • 1 Features
Jan 1, 2026January 2026: Delivered security-focused SMTP enhancements to kivitendo-erp, reinforcing SSL usage for all SMTP transmissions, validating SASL mechanisms for SMTP authentication, and documenting the libauthen-sasl-perl dependency required for Debian 13. This work improves email reliability, reduces risk of credential compromise, and aligns with OS-packaging requirements.
January 2026
October 2025
1 Commits
Oct 1, 2025October 2025 focused on correctness of SEPA export data in the kivitendo ERP. Delivered a targeted bug fix to ensure the bank account holder name is used for SEPA exports when specified, with a safe fallback to the billing address. The change improves payment data accuracy, regulatory alignment, and customer trust, while laying groundwork for future SEPA enhancements.
October 2025
1 Commits
Oct 1, 2025October 2025 focused on correctness of SEPA export data in the kivitendo ERP. Delivered a targeted bug fix to ensure the bank account holder name is used for SEPA exports when specified, with a safe fallback to the billing address. The change improves payment data accuracy, regulatory alignment, and customer trust, while laying groundwork for future SEPA enhancements.
September 2025
1 Commits
Sep 1, 20252025-09 monthly summary for kivitendo/kivitendo-erp: Focused on stabilizing critical invoice processing pathways. Implemented a targeted bug fix in the Invoice to Dunning relationship by removing the with_objects argument to prevent errors when accessing invoices; reduces unnecessary object loading and improves performance. The changes enhance reliability of invoicing and dunning workflows, contributing to accurate billing and cash flow management.
1 Commits
Sep 1, 20252025-09 monthly summary for kivitendo/kivitendo-erp: Focused on stabilizing critical invoice processing pathways. Implemented a targeted bug fix in the Invoice to Dunning relationship by removing the with_objects argument to prevent errors when accessing invoices; reduces unnecessary object loading and improves performance. The changes enhance reliability of invoicing and dunning workflows, contributing to accurate billing and cash flow management.
September 2025
August 2025
9 Commits • 5 Features
Aug 1, 2025August 2025 (kivitendo/kivitendo-erp): Delivered a set of product improvements and refactors with a strong emphasis on localization, documentation, and maintainability. Localization Improvements updated German and English translations, removed unused strings, and corrected translations across UI and JS (commits: b34c267b99447e29969296abf099844798971229; 53ea3f252c7587907d35ffed7940f6ae1d5dea93; 5c763902201b73c0436faff400fb0293036750b2). Documentation and Email Import Enhancements added docs updates, changelog entries, and new options for email import as part of PR #461 (commits: cbf41068c019cbde888436c0fe9de3fe0b48ab4c; cc8b7890337309e078225456ae8a815b0466b7f7; 8dfaedbc2d784bcac8c8b7008cd4862f9bf106e1). Zero-Quantity Components Feature enables production of items with zero-quantity components and is configurable (commit: c71e934dd4c940bef76d5870240014fd85187693). Stock Journal Quantity Change Indicator adds a new visual cue for inventory movements (+/-) (commit: 6851d7f64cfc9e4a43a8c6826084fe8dfe180be6). Refactor: Delete User to Accept User Object updates SL::Auth to operate on a user object for deletion, improving clarity and future maintainability (commit: ea772fc4133b177c7c279a5d2cdfb0056e56c190).
August 2025
9 Commits • 5 Features
Aug 1, 2025August 2025 (kivitendo/kivitendo-erp): Delivered a set of product improvements and refactors with a strong emphasis on localization, documentation, and maintainability. Localization Improvements updated German and English translations, removed unused strings, and corrected translations across UI and JS (commits: b34c267b99447e29969296abf099844798971229; 53ea3f252c7587907d35ffed7940f6ae1d5dea93; 5c763902201b73c0436faff400fb0293036750b2). Documentation and Email Import Enhancements added docs updates, changelog entries, and new options for email import as part of PR #461 (commits: cbf41068c019cbde888436c0fe9de3fe0b48ab4c; cc8b7890337309e078225456ae8a815b0466b7f7; 8dfaedbc2d784bcac8c8b7008cd4862f9bf106e1). Zero-Quantity Components Feature enables production of items with zero-quantity components and is configurable (commit: c71e934dd4c940bef76d5870240014fd85187693). Stock Journal Quantity Change Indicator adds a new visual cue for inventory movements (+/-) (commit: 6851d7f64cfc9e4a43a8c6826084fe8dfe180be6). Refactor: Delete User to Accept User Object updates SL::Auth to operate on a user object for deletion, improving clarity and future maintainability (commit: ea772fc4133b177c7c279a5d2cdfb0056e56c190).
July 2025
1 Commits
Jul 1, 2025July 2025 – Focused on reliability of PDF attachments in kivitendo/kivitendo-erp. Key work: resolved PDF merging duplication by ensuring the original document is included exactly once when assembling emails. This was achieved by adjusting the operation order to add the original document before appending other attachments, preserving merged PDF integrity. Impact: fewer customer-reported issues, improved email reliability, and stronger document workflow integrity. Technologies/skills: debugging merge logic, version control discipline, and hands-on fix deployment.
1 Commits
Jul 1, 2025July 2025 – Focused on reliability of PDF attachments in kivitendo/kivitendo-erp. Key work: resolved PDF merging duplication by ensuring the original document is included exactly once when assembling emails. This was achieved by adjusting the operation order to add the original document before appending other attachments, preserving merged PDF integrity. Impact: fewer customer-reported issues, improved email reliability, and stronger document workflow integrity. Technologies/skills: debugging merge logic, version control discipline, and hands-on fix deployment.
July 2025
May 2025
5 Commits • 3 Features
May 1, 20252025-05 monthly summary for kivitendo-erp focused on delivering UX-friendly email capabilities, reliable PDF attachment handling, and robust background job configuration. No explicit major bug fixes were recorded this month; the emphasis was on feature delivery, code quality, and documentation to support maintainability and future enhancements. The work improved end-to-end email workflows, reduced user friction, and standardized external link handling in reminders, contributing to business value and system reliability.
May 2025
5 Commits • 3 Features
May 1, 20252025-05 monthly summary for kivitendo-erp focused on delivering UX-friendly email capabilities, reliable PDF attachment handling, and robust background job configuration. No explicit major bug fixes were recorded this month; the emphasis was on feature delivery, code quality, and documentation to support maintainability and future enhancements. The work improved end-to-end email workflows, reduced user friction, and standardized external link handling in reminders, contributing to business value and system reliability.
April 2025
1 Commits
Apr 1, 2025Month: 2025-04 — Focused on stabilizing the email workflow in the kivitendo/kivitendo-erp repository. Delivered a targeted bug fix to ensure email attachments include all uploaded PDFs, enhancing reliability of document-heavy communications. No new features were released this month; effort centered on robustness, correctness, and maintainability of the existing email sending flow.
1 Commits
Apr 1, 2025Month: 2025-04 — Focused on stabilizing the email workflow in the kivitendo/kivitendo-erp repository. Delivered a targeted bug fix to ensure email attachments include all uploaded PDFs, enhancing reliability of document-heavy communications. No new features were released this month; effort centered on robustness, correctness, and maintainability of the existing email sending flow.
April 2025
March 2025
16 Commits • 4 Features
Mar 1, 2025March 2025 — kivitendo/kivitendo-erp: Focus on reliability of document workflows, security hardening, and improved financial postings. Key deliverables include a new PDF merge option for email attachments, fixes to attachment content download, XXE mitigation in ZUGFeRD XML parsing, enhanced credit note handling with tests, and a safe reference-account fallback when no transaction is found. Also completed documentation updates and changelog entries for the 3.9.2 beta. Impact: reduces user error, increases security, and improves accounting accuracy; demonstrated skills in PDF processing, XML security, tests, and documentation cohesion.
March 2025
16 Commits • 4 Features
Mar 1, 2025March 2025 — kivitendo/kivitendo-erp: Focus on reliability of document workflows, security hardening, and improved financial postings. Key deliverables include a new PDF merge option for email attachments, fixes to attachment content download, XXE mitigation in ZUGFeRD XML parsing, enhanced credit note handling with tests, and a safe reference-account fallback when no transaction is found. Also completed documentation updates and changelog entries for the 3.9.2 beta. Impact: reduces user error, increases security, and improves accounting accuracy; demonstrated skills in PDF processing, XML security, tests, and documentation cohesion.
February 2025
8 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for kivitendo/kivitendo-erp. Delivered focused improvements across the follow‑up workflow, financial processing integrity, error visibility, and documentation/SSO readiness. The work enhanced operational efficiency, reduced financial risk, and improved maintainability and compliance posture, with hands‑on experience across backend logic, data handling, and documentation standards.
8 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for kivitendo/kivitendo-erp. Delivered focused improvements across the follow‑up workflow, financial processing integrity, error visibility, and documentation/SSO readiness. The work enhanced operational efficiency, reduced financial risk, and improved maintainability and compliance posture, with hands‑on experience across backend logic, data handling, and documentation standards.
February 2025
January 2025
31 Commits • 16 Features
Jan 1, 2025January 2025 focused on delivering business value through UX improvements, data quality enhancements, and robust processing across kivitendo/kivitendo-erp. Major achievements include parameter cleanup and cosmetic refinements, enhanced UI navigation from Waren to Lagerjournal, localization updates, and improved email parsing, along with invoice title clarity improvements. Critical bug fixes also strengthened stability and data integrity (import warnings suppressed, calculation guards added for missing data, and restoration of key data logic such as get_agreement and AR transaction integrity). These changes reduce manual rework, improve workflow efficiency, and enhance reporting accuracy. Demonstrates proficiency in refactoring, UI/UX improvements, localization, IMAP-based email processing, and data modeling.
January 2025
31 Commits • 16 Features
Jan 1, 2025January 2025 focused on delivering business value through UX improvements, data quality enhancements, and robust processing across kivitendo/kivitendo-erp. Major achievements include parameter cleanup and cosmetic refinements, enhanced UI navigation from Waren to Lagerjournal, localization updates, and improved email parsing, along with invoice title clarity improvements. Critical bug fixes also strengthened stability and data integrity (import warnings suppressed, calculation guards added for missing data, and restoration of key data logic such as get_agreement and AR transaction integrity). These changes reduce manual rework, improve workflow efficiency, and enhance reporting accuracy. Demonstrates proficiency in refactoring, UI/UX improvements, localization, IMAP-based email processing, and data modeling.
December 2024
10 Commits • 2 Features
Dec 1, 2024December 2024 — Implemented targeted enhancements and reliability fixes for kivitendo/kivitendo-erp, delivering tangible business value: SetNumberRange enhancements with current_year, broader yearly ranges, and monthly resets plus accompanying documentation; SEPA End-to-End ID matching reliability improvements; DeliveryOrder date handling fix (dodate to transdate); selftest to exclude final_invoice from paid checks; code readability cleanup. Impact: more accurate numbering and reporting, reduced false warnings, correct date persistence, reliable payment statuses, and faster onboarding through clear setup guidance. Technologies used include Perl, PostgreSQL, automated tests, documentation, and targeted refactors.
10 Commits • 2 Features
Dec 1, 2024December 2024 — Implemented targeted enhancements and reliability fixes for kivitendo/kivitendo-erp, delivering tangible business value: SetNumberRange enhancements with current_year, broader yearly ranges, and monthly resets plus accompanying documentation; SEPA End-to-End ID matching reliability improvements; DeliveryOrder date handling fix (dodate to transdate); selftest to exclude final_invoice from paid checks; code readability cleanup. Impact: more accurate numbering and reporting, reduced false warnings, correct date persistence, reliable payment statuses, and faster onboarding through clear setup guidance. Technologies used include Perl, PostgreSQL, automated tests, documentation, and targeted refactors.
December 2024
November 2024
4 Commits • 2 Features
Nov 1, 20242024-11 monthly summary for kivitendo/kivitendo-erp: Implemented robust SEPA bank reconciliation improvements, refined bank transaction matching with End-To-End ID checks and absolute-amount alignment; improved self-test coverage for reverse-charge tax scenarios to avoid false alarms; updated Debian LaTeX installation documentation to include latexmk for out-of-the-box processing. Outcomes include higher reconciliation accuracy, fewer false tax alarms in tests, and easier setup for Debian-based environments.
November 2024
4 Commits • 2 Features
Nov 1, 20242024-11 monthly summary for kivitendo/kivitendo-erp: Implemented robust SEPA bank reconciliation improvements, refined bank transaction matching with End-To-End ID checks and absolute-amount alignment; improved self-test coverage for reverse-charge tax scenarios to avoid false alarms; updated Debian LaTeX installation documentation to include latexmk for out-of-the-box processing. Outcomes include higher reconciliation accuracy, fewer false tax alarms in tests, and easier setup for Debian-based environments.
May 2024
1 Commits
May 1, 2024May 2024 monthly summary for kivitendo/kivitendo-erp focusing on business value and technical achievements. Key features delivered: - Maintenance-focused improvements with a reliability enhancement to the user lifecycle flow, specifically strengthening user deletion reliability and metadata handling across client databases (no new user-facing features added this month). Major bugs fixed: - Resolved inconsistency in user deletion by refactoring the delete_user logic in Auth.pm to ensure proper handling of user metadata and consistent updates to client databases. Commit: 84bf551d6130223418e1b30a91921e28eab48862 (message: delete_user in Auth.pm überarbeitet). Overall impact and accomplishments: - Improved data integrity and reliability of user lifecycle management across systems, reducing risk of orphaned user records and metadata inconsistencies. This supports smoother audits, downstream processes, and regulatory compliance. - Maintained system stability while preserving existing feature sets; demonstrated ability to implement critical fixes with minimal disruption. Technologies/skills demonstrated: - Perl codebase expertise (Auth.pm), code refactoring for reliability, and robust metadata handling across databases. - Change traceability through clear commit messages and structured fixes. - Maintained cross-system consistency with client database updates during user deletion flows.
1 Commits
May 1, 2024May 2024 monthly summary for kivitendo/kivitendo-erp focusing on business value and technical achievements. Key features delivered: - Maintenance-focused improvements with a reliability enhancement to the user lifecycle flow, specifically strengthening user deletion reliability and metadata handling across client databases (no new user-facing features added this month). Major bugs fixed: - Resolved inconsistency in user deletion by refactoring the delete_user logic in Auth.pm to ensure proper handling of user metadata and consistent updates to client databases. Commit: 84bf551d6130223418e1b30a91921e28eab48862 (message: delete_user in Auth.pm überarbeitet). Overall impact and accomplishments: - Improved data integrity and reliability of user lifecycle management across systems, reducing risk of orphaned user records and metadata inconsistencies. This supports smoother audits, downstream processes, and regulatory compliance. - Maintained system stability while preserving existing feature sets; demonstrated ability to implement critical fixes with minimal disruption. Technologies/skills demonstrated: - Perl codebase expertise (Auth.pm), code refactoring for reliability, and robust metadata handling across databases. - Change traceability through clear commit messages and structured fixes. - Maintained cross-system consistency with client database updates during user deletion flows.
May 2024
June 2023
1 Commits • 1 Features
Jun 1, 2023June 2023 monthly summary for kivitendo/kivitendo-erp focusing on feature delivery and business impact. Key work: SWIFT code support in MT940 parsing, enabling SWIFT codes in MT940 field 25, updating parsing logic and UI for better bank account management. This improvement enhances reconciliation accuracy, bank data flexibility, and broader SWIFT compatibility for customers. No major regressions observed; one committed change tracked for traceability.
June 2023
1 Commits • 1 Features
Jun 1, 2023June 2023 monthly summary for kivitendo/kivitendo-erp focusing on feature delivery and business impact. Key work: SWIFT code support in MT940 parsing, enabling SWIFT codes in MT940 field 25, updating parsing logic and UI for better bank account management. This improvement enhances reconciliation accuracy, bank data flexibility, and broader SWIFT compatibility for customers. No major regressions observed; one committed change tracked for traceability.
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Quality Metrics
Correctness89.8%
Maintainability90.2%
Architecture85.8%
Performance86.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
HTMLJavaScriptMarkdownPHPPerlPlain textSQLTextUnknownXML
Technical Skills
AccountingAuthenticationBackend DevelopmentChangelog ManagementCode FormattingCode RefactoringCode ReviewDatabaseDatabase InteractionDatabase ManagementDatabase OptimizationDatabase Query OptimizationDatabase QueryingDocumentationEmail Integration
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline