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Timo Kössler

PROFILE

Timo Kössler

Timo Koessler developed and maintained the AikidoSec/firewall-node repository, delivering robust backend security features and scalable access controls for cloud-native environments. He engineered middleware for attack detection, rate limiting, and IP allowlisting, integrating technologies such as Node.js, TypeScript, and MongoDB. His work included hardening against SQL injection and IDOR vulnerabilities, modernizing CI/CD pipelines, and expanding end-to-end test coverage to ensure reliability and maintainability. By refactoring core modules, updating dependencies, and aligning with evolving standards, Timo improved deployment stability and security posture. His technical depth is reflected in comprehensive test automation, detailed documentation, and thoughtful integration of AI SDK telemetry.

Overall Statistics

Feature vs Bugs

69%Features

Repository Contributions

464Total
Bugs
72
Commits
464
Features
158
Lines of code
121,846
Activity Months16

Work History

February 2026

7 Commits • 3 Features

Feb 1, 2026

February 2026 monthly summary for AikidoSec/firewall-node. Focused on strengthening security controls, stabilizing test infrastructure, and modernizing dependencies to improve reliability and long-term maintainability. Delivered hardened access control for IDOR scenarios through middleware-enforced user/tenant checks, updated database interaction guards, and comprehensive tests. Upgraded test suite and CI coverage to improve visibility and reliability, including improved end-to-end tests and stronger SQL injection checks in Sentry tests. Migrated MongoDB driver to v7, ensuring compatibility and smoother future upgrades. Overall impact: reduced security risk, more predictable deployments, and faster feedback through enhanced test visibility and automation. Technologies: Node.js, Express middleware, MongoDB driver v7, CI/CD improvements, test automation, security testing, Sentry checks.

January 2026

13 Commits • 4 Features

Jan 1, 2026

January 2026 monthly summary — AikidoSec/firewall-node. Focused on stabilizing and documenting Sentry/ESM workflows, strengthening CI/CD reliability, hardening security in the Functions Framework, and improving overall code quality. Delivered production-ready ESM support with enhanced Sentry documentation and status updates; tightened CI/CD with OIDC-based test coverage uploads, enforced build failures on coverage upload failures, and aligned test matrices across Node versions; applied security hardening including attack-wave detection and defaulting injection protection to CommonJS; completed code quality and maintenance work such as lockfile updates, lint fixes, and migrating formatting tooling from Prettier to Oxfmt. These efforts improve release risk management, observability, and secure, efficient deployments.

December 2025

20 Commits • 8 Features

Dec 1, 2025

December 2025 monthly summary for AikidoSec/firewall-node: Delivered a comprehensive set of improvements focused on testability, reliability, security, and performance. Implemented End-to-End Testing Enhancements, CI/build and infrastructure optimizations, and code quality improvements, alongside targeted server configuration updates and AI SDK alignment. These efforts significantly improved test coverage, CI reliability, and overall code health while introducing safer data handling and forward-looking capabilities for Next.js and AI integrations.

November 2025

1 Commits • 1 Features

Nov 1, 2025

November 2025 monthly summary focused on Winget packaging improvements for the 2FAGuard release in the vedantmgoyal9/winget-pkgs repository. Delivered a comprehensive package metadata and installer update for Winget, enabling easier distribution and installation, with localization readiness and an explicit version manifest. No major bugs reported in this period. The changes align with packaging automation and deployment readiness for enterprise environments.

October 2025

13 Commits • 4 Features

Oct 1, 2025

October 2025 monthly summary for AikidoSec/firewall-node focused on reliability, security, and performance improvements. Delivered features across hardening, benchmarking, CI/CD robustness, and security safeguards, with measurable business impact including more stable deployments, clearer performance insights, and stronger security postures.

September 2025

32 Commits • 9 Features

Sep 1, 2025

In Sep 2025, delivered substantial enhancements to firewall-node and packaging pipelines, focusing on detection robustness, reporting accuracy, test stability, and release readiness. Key efforts spanned attack wave analytics, SSRF reporting fixes, CI/CD modernization, and packaging metadata updates for timely releases.

August 2025

65 Commits • 26 Features

Aug 1, 2025

August 2025 delivered security hardening, reliability, and performance improvements across two repositories (AikidoSec/firewall-node and vedantmgoyal9/winget-pkgs). Key security work includes path traversal hardening across platforms (path.resolve bypass, macOS root-dir checks, URL decoding and path normalization) and IPv6 handling improvements, complemented by Node.js v16 compatibility fixes and SSRF protection tightening. Reliability was boosted by fixing HTTP server double-wrapping, platform-specific bugs, and expanding test coverage and linting. Business value was enhanced via added capabilities like custom IP headers, AI SDK/GenAI integration readiness, and packaging updates that enable Winget distribution of new releases. Overall, this month reduced security risk, improved deployment stability, and set the stage for performance gains and easier maintenance.

July 2025

31 Commits • 10 Features

Jul 1, 2025

Concise monthly summary for 2025-07 highlighting key features delivered, major bugs fixed, impact, and technologies demonstrated for AikidoSec/firewall-node.

June 2025

42 Commits • 16 Features

Jun 1, 2025

June 2025 Highlights for AikidoSec/firewall-node: Achieved Cloud Functions Framework v4 compatibility and Pub/Sub v5 support, enabling production-grade cloud integration and updated CI to run Pub/Sub emulator. Implemented entrypoint and startup reliability fixes to eliminate duplicate startup edge cases, boosting stability in edge deployments. Strengthened CI/testing stability by updating libraries (AWS SDK, Undici) and fixing unit tests, improving confidence and speed of iteration. Introduced rate limiting groups and adjusted heartbeat behavior, plus GraphQL rate limit counting, providing better throughput management and observability. Enhanced AI components with updated sinks/streams and telemetry for AI SDK usage, including OpenAI v5 support, expanding capabilities and monitoring. Added robust test infrastructure and documentation updates, improving maintainability and developer experience.

May 2025

18 Commits • 7 Features

May 1, 2025

May 2025 was focused on safety, security detection, and production readiness across AikidoSec/firewall-node and crowdsecurity/hub. Delivered robust input safety (SafeDecodeURIComponent) with tests and benchmarks; improved SQL injection detection with deduplicated extraction and dialect-aware reporting; upgraded CI/testing for Node.js 24 compatibility with benchmark considerations; standardized TypeScript setup via tsconfig for firewall-node; enhanced IP route matching; and improved data schema to handle empty arrays. Fixed a critical bug in the BetterSQLite3 sink (operation type) and updated gitignore. Business value: stronger defense, more reliable testing, smoother Node.js 24 deployments, and reduced maintenance friction.

April 2025

38 Commits • 12 Features

Apr 1, 2025

April 2025 performance summary: Focused on developer experience, reliability, security, and modernization across firewall-node and winget-pkgs. Delivered Dev Environment/CI/CD enhancements, dependency modernization, HTTP/2 improvements, security metrics and hardening, test stabilization and coverage expansion, and Winget packaging for Timokoessler.2FAGuard v1.5.7.

March 2025

35 Commits • 12 Features

Mar 1, 2025

March 2025: Delivered impactful enhancements across firewall-node, with expanded IP address handling, improved observability, performance testing, and build quality; added IP range support and compatibility updates; progressed Windows distribution via Winget. These changes strengthen cross‑protocol reliability, troubleshooting efficiency, and deployment scalability, supporting faster time-to-value for customers and easier maintenance for the team.

February 2025

26 Commits • 14 Features

Feb 1, 2025

February 2025 monthly summary for AikidoSec/firewall-node and nushell/winget-pkgs. Key features delivered include IP address handling refactor and naming consistency (rename to allowedIPAddresses and bypassedIP with an updated API surface to onlyAllowedIPAddresses), IP bypass range support, and rate-limiting enhancements using a sliding window. Major bugs fixed include not blocking private IP addresses and preventing merging of allowed IP addresses across contexts. Expanded test coverage for IP allowlist and CI improvements with performance optimizations. Windows distribution improved via Winget packaging for 2FAGuard v1.5.5 on Windows. Technologies demonstrated include TypeScript/Node, testing and CI optimization, and Windows Winget packaging. Business impact includes reduced risk of unintended access, improved reliability of access control, faster CI feedback, and broader distribution readiness.

January 2025

31 Commits • 12 Features

Jan 1, 2025

2025-01 monthly summary for AikidoSec/firewall-node: Delivered reliability, performance, and developer experience improvements through a mix of feature work, bug fixes, and tooling modernization. The month focused on stabilizing core CI reliability, strengthening data access components, expanding test coverage, and modernizing the build and test pipelines to accelerate delivery while improving diagnostics and security. Key outcomes include CI/Lambda end-to-end test stabilization, enhanced MySQL2 integration, broader end-to-end coverage, and a modernized build workflow, supported by targeted fixes to imports, WASM handling, and linting to raise overall code quality.

December 2024

62 Commits • 13 Features

Dec 1, 2024

December 2024 focused on strengthening security, reliability, and developer velocity for AikidoSec/firewall-node. Key work included hardening attack path processing, expanding end-to-end and unit test coverage, tightening code quality, boosting performance, and modernizing CI/CD and build infra. The result is a more secure, dependable platform with faster deployment cycles and clearer business value for customers.

November 2024

30 Commits • 7 Features

Nov 1, 2024

November 2024 focused on security hardening, multi-DB readiness, and CI reliability for AikidoSec/firewall-node. Key features include IP address blocking and improved header handling with tests, plus Prisma integration across SQLite, Postgres, and MongoDB with a rewritten sink and safeguards for raw MongoDB methods. Reliability efforts covered main-branch test stability and expanded coverage (unit and e2e), Node v23 compatibility fixes, and targeted build/runtime fixes, along with code quality improvements and Prisma v6 support. These workstreams reduce security risk, improve deployment confidence, and lay groundwork for scalable, data-backed configurations.

Activity

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Quality Metrics

Correctness91.4%
Maintainability91.0%
Architecture86.0%
Performance86.6%
AI Usage21.8%

Skills & Technologies

Programming Languages

CSSDockerfileGitGoHTMLJSONJavaScriptMJSMakefileMarkdown

Technical Skills

AI SDK IntegrationAPI DesignAPI DevelopmentAPI InstrumentationAPI IntegrationAPI SecurityAPI designAPI developmentAPI integrationAWS SDKAccess ControlAdonisJSAsynchronous ProgrammingBackend DevelopmentBenchmarking

Repositories Contributed To

5 repos

Overview of all repositories you've contributed to across your timeline

AikidoSec/firewall-node

Nov 2024 Feb 2026
15 Months active

Languages Used

JSONJavaScriptPrisma SchemaSQLTypeScriptMakefileMarkdownYAML

Technical Skills

API DevelopmentAPI InstrumentationBackend DevelopmentBuild ToolsCI/CDCode Refactoring

vedantmgoyal9/winget-pkgs

Aug 2025 Nov 2025
3 Months active

Languages Used

YAML

Technical Skills

DevOpsPackage ManagementYAMLCI/CD

nushell/winget-pkgs

Feb 2025 Apr 2025
3 Months active

Languages Used

YAML

Technical Skills

Package ManagementWindows Application DeploymentYAMLDevOps

crowdsecurity/hub

May 2025 May 2025
1 Month active

Languages Used

YAML

Technical Skills

Configuration ManagementData AnalysisData TransformationLog Parsing

nodejs/node

Mar 2025 Mar 2025
1 Month active

Languages Used

Markdown

Technical Skills

API designdocumentation

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