
Friederike Hanssen developed and maintained bioinformatics pipelines and training resources across the nf-core/sarek, nf-core/rnaseq, and nextflow-io/training repositories, focusing on workflow optimization, code quality, and user onboarding. She integrated tools like BBSplit and Sentieon StarAlign, enhanced pipeline configuration and validation using Nextflow and YAML, and improved visualization and documentation for clarity and maintainability. Her work included refactoring modules, implementing CI/CD with GitHub Actions, and strengthening security through secrets management. By modernizing training content and standardizing configuration, Friederike enabled more efficient development cycles, improved data quality, and facilitated adoption of best practices in genomics pipeline engineering.

October 2025: Implemented feature-rich contamination removal and MSI analysis improvements across nf-core/sarek and bioconda-recipes, delivering measurable business value through improved data quality, streamlined workflows, and stronger packaging stability. Specific outcomes include BBSplit integration and visualization in the Sarek pipeline, modernizing MSI calling with the msi subcommand and dynamic WES/WGS handling, and hardening MSISensor2 packaging to eliminate segmentation faults in end-user environments. These changes reduce manual intervention, improve reproducibility, and enhance maintainability of critical genomic analysis pipelines.
October 2025: Implemented feature-rich contamination removal and MSI analysis improvements across nf-core/sarek and bioconda-recipes, delivering measurable business value through improved data quality, streamlined workflows, and stronger packaging stability. Specific outcomes include BBSplit integration and visualization in the Sarek pipeline, modernizing MSI calling with the msi subcommand and dynamic WES/WGS handling, and hardening MSISensor2 packaging to eliminate segmentation faults in end-user environments. These changes reduce manual intervention, improve reproducibility, and enhance maintainability of critical genomic analysis pipelines.
September 2025 nf-core/sarek: Focused on code quality and pipeline transparency. Key features delivered: (1) Controlfreec Modules: Code Quality and Linting Improvements — refactors and formatting across .nf/.yml to align with language server standards; commit 13890c0f4fc3067c0df80987a60135f7fc23a219; no user-facing features added, but maintainability and lint reliability improved. (2) Subway Map Visualization Enhancement — added Varlociraptor option and clarified processing steps to enhance pipeline clarity; commit ec65b90599b450baf3400e6b03acc44a4b53462c; improved UX and accuracy. Major bugs fixed: linting fixes and code quality remediation to reduce CI failures and technical debt. Overall impact: higher maintainability, reduced onboarding friction, and clearer pipeline representations enabling faster iteration and easier troubleshooting. Technologies/skills demonstrated: code quality tooling, linting, language server standards, YAML/.nf formatting, and visualization component enhancements.
September 2025 nf-core/sarek: Focused on code quality and pipeline transparency. Key features delivered: (1) Controlfreec Modules: Code Quality and Linting Improvements — refactors and formatting across .nf/.yml to align with language server standards; commit 13890c0f4fc3067c0df80987a60135f7fc23a219; no user-facing features added, but maintainability and lint reliability improved. (2) Subway Map Visualization Enhancement — added Varlociraptor option and clarified processing steps to enhance pipeline clarity; commit ec65b90599b450baf3400e6b03acc44a4b53462c; improved UX and accuracy. Major bugs fixed: linting fixes and code quality remediation to reduce CI failures and technical debt. Overall impact: higher maintainability, reduced onboarding friction, and clearer pipeline representations enabling faster iteration and easier troubleshooting. Technologies/skills demonstrated: code quality tooling, linting, language server standards, YAML/.nf formatting, and visualization component enhancements.
August 2025 performance summary for nf-core/rnaseq: Delivered Sentieon StarAlign integration with parity to igenomes star, including installation, new sentieon_align_star args, and syntax refactor. Implemented Sentieon secrets in CI and added auth_mech and additional environment variables to support Sentieon workflows, improving security and reproducibility. Replaced the local module with nf-core module and updated configs for streamlined maintenance. Expanded test coverage and documentation: complete Sentieon pipeline tests, subworkflow tests, prepare_genome support, and updated snapshot tests, README, license docs, and changelog. Fixed critical reliability issues and regressions, including Sentieon Star argument style compatibility, versioning/checksum fixes, quotes handling, syntax error, initialization, and ordering fixes. Overall, these efforts improve pipeline stability, deployment confidence, and developer productivity.
August 2025 performance summary for nf-core/rnaseq: Delivered Sentieon StarAlign integration with parity to igenomes star, including installation, new sentieon_align_star args, and syntax refactor. Implemented Sentieon secrets in CI and added auth_mech and additional environment variables to support Sentieon workflows, improving security and reproducibility. Replaced the local module with nf-core module and updated configs for streamlined maintenance. Expanded test coverage and documentation: complete Sentieon pipeline tests, subworkflow tests, prepare_genome support, and updated snapshot tests, README, license docs, and changelog. Fixed critical reliability issues and regressions, including Sentieon Star argument style compatibility, versioning/checksum fixes, quotes handling, syntax error, initialization, and ordering fixes. Overall, these efforts improve pipeline stability, deployment confidence, and developer productivity.
July 2025: nf-core/website focused on improving repository processing accuracy by excluding irrelevant repositories. Implemented Website Configuration: Ignore megatest-seqerakit Repository, reducing noise and preventing unnecessary indexing. This aligns with data governance and performance goals. No major bug fixes were recorded for nf-core/website this month; improvement came from configuration changes and process hygiene.
July 2025: nf-core/website focused on improving repository processing accuracy by excluding irrelevant repositories. Implemented Website Configuration: Ignore megatest-seqerakit Repository, reducing noise and preventing unnecessary indexing. This aligns with data governance and performance goals. No major bug fixes were recorded for nf-core/website this month; improvement came from configuration changes and process hygiene.
Monthly summary for 2025-05: Delivered performance-focused workflow enhancements and branding updates across two repositories, delivering tangible efficiency gains and improved platform presentation. Key outcomes include standardized publishDir symlink handling to reduce file copies in genomics pipelines, branding improvement for Sarek with a new project icon, and increased resilience for long-running tasks via extended time limits.
Monthly summary for 2025-05: Delivered performance-focused workflow enhancements and branding updates across two repositories, delivering tangible efficiency gains and improved platform presentation. Key outcomes include standardized publishDir symlink handling to reduce file copies in genomics pipelines, branding improvement for Sarek with a new project icon, and increased resilience for long-running tasks via extended time limits.
April 2025 – nextflow-io/training: Improved developer experience and security posture through two targeted bug fixes. NF-test Documentation Clarifications enhances documentation clarity by correcting numbering and removing an unnecessary file reference; Dev Environment TLS 1.2 Enforcement for Java Clients secures dev connections by configuring NXF_OPTS and introducing a TLS client env var. Result: smoother onboarding, fewer environment-related issues, and better protocol compatibility. All changes are recorded in the commit history (d1c52c21ecfed50f09c7f9a8f88c3e74887f6c5c; f4d68e719d945fbb58ace06ab4d7082bb1399aef).
April 2025 – nextflow-io/training: Improved developer experience and security posture through two targeted bug fixes. NF-test Documentation Clarifications enhances documentation clarity by correcting numbering and removing an unnecessary file reference; Dev Environment TLS 1.2 Enforcement for Java Clients secures dev connections by configuring NXF_OPTS and introducing a TLS client env var. Result: smoother onboarding, fewer environment-related issues, and better protocol compatibility. All changes are recorded in the commit history (d1c52c21ecfed50f09c7f9a8f88c3e74887f6c5c; f4d68e719d945fbb58ace06ab4d7082bb1399aef).
March 2025 performance summary focused on delivering business value through training content modernization, documentation improvements, and code quality enhancements across nf-core training and website repos.
March 2025 performance summary focused on delivering business value through training content modernization, documentation improvements, and code quality enhancements across nf-core training and website repos.
2025-01 monthly summary focused on delivering schema and pipeline updates for nf-core/sarek, supporting more robust validation and faster development cycles.
2025-01 monthly summary focused on delivering schema and pipeline updates for nf-core/sarek, supporting more robust validation and faster development cycles.
December 2024 nf-core/sarek monthly summary: Delivered release-ready improvements and stability in the core pipeline. Major features include paired data support, Metromap data update, figure improvements, PNG size reduction, and release/distribution readiness (version bumps, packaging, environment.yml updates, and changelog/docs updates). Major bugs fixed include Sentieon module call fixes, documentation section corrections, tests adjusted after conversion removal, naming consistency fixes, subway path and channel name fixes, and removal of deprecated --max option, as well as cleanup of local modules. The combined work improves pipeline reliability, reduces storage and load times, enhances user experience, and positions the project for a smooth 2025 release. Technologies demonstrated include version control discipline, release management, environment management, test scaffolding, documentation practices, and UI/data visualization improvements.
December 2024 nf-core/sarek monthly summary: Delivered release-ready improvements and stability in the core pipeline. Major features include paired data support, Metromap data update, figure improvements, PNG size reduction, and release/distribution readiness (version bumps, packaging, environment.yml updates, and changelog/docs updates). Major bugs fixed include Sentieon module call fixes, documentation section corrections, tests adjusted after conversion removal, naming consistency fixes, subway path and channel name fixes, and removal of deprecated --max option, as well as cleanup of local modules. The combined work improves pipeline reliability, reduces storage and load times, enhances user experience, and positions the project for a smooth 2025 release. Technologies demonstrated include version control discipline, release management, environment management, test scaffolding, documentation practices, and UI/data visualization improvements.
November 2024 focused on delivering end-to-end training materials for nf-core Nextflow pipelines and strengthening documentation to improve onboarding, demo reliability, and developer efficiency. The work enhances business value by accelerating new contributor ramp-up, increasing adoption of nf-core tooling, and ensuring consistent, high-quality training demos.
November 2024 focused on delivering end-to-end training materials for nf-core Nextflow pipelines and strengthening documentation to improve onboarding, demo reliability, and developer efficiency. The work enhances business value by accelerating new contributor ramp-up, increasing adoption of nf-core tooling, and ensuring consistent, high-quality training demos.
2024-10 monthly summary for nf-core/sarek focused on delivering user-facing configurability, validation, and UI consistency to drive business value. Key outcomes include exposing and validating pipeline configuration parameters with an updated JSON schema and changelog, refreshing UI icons for visual consistency, and targeted repository hygiene to improve maintainability and onboarding.
2024-10 monthly summary for nf-core/sarek focused on delivering user-facing configurability, validation, and UI consistency to drive business value. Key outcomes include exposing and validating pipeline configuration parameters with an updated JSON schema and changelog, refreshing UI icons for visual consistency, and targeted repository hygiene to improve maintainability and onboarding.
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