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Andrew Johnston

PROFILE

Andrew Johnston

Over the past 20 months, this developer advanced the ASFHyP3 and NASA Harmony repositories by delivering robust backend features, scalable cloud deployments, and secure authentication systems. They engineered deployment automation and resource optimization using Python, YAML, and AWS services, enabling high-throughput geospatial data processing and streamlined CI/CD workflows. Their work included modernizing InSAR and NISAR workflows, enhancing API integration, and improving cost management through infrastructure-as-code and dependency upgrades. Documentation and testing were consistently maintained, with clear changelogs and regression coverage. Their technical approach emphasized maintainability, security, and operational efficiency, resulting in resilient, production-ready cloud services and data pipelines.

Overall Statistics

Feature vs Bugs

78%Features

Repository Contributions

245Total
Bugs
26
Commits
245
Features
94
Lines of code
383,270
Activity Months20

Work History

June 2026

1 Commits • 1 Features

Jun 1, 2026

June 2026 performance summary for ASFHyP3/hyp3-docs: Focused on dependency cleanup to streamline the build and reduce external reliance. Removed polyfill.io from dependencies, contributing to a lighter, more maintainable codebase and clearer version history. The change is captured by commit 7fb42b794188140981538b8dae5fbedb9fcbf8f9 with message 'Update CHANGELOG.md'. No major bugs were fixed this month; the work lays groundwork for future optimizations and improved release hygiene. Technologies demonstrated include dependency management, build simplification, and changelog discipline. Business value: reduced external risk, easier maintenance, faster onboarding for contributors, and clearer audit trails.

May 2026

13 Commits • 6 Features

May 1, 2026

Concise monthly summary for May 2026 highlighting business value and technical achievements across repositories. The month focused on delivering reliable test coverage, stabilizing cost reporting, tightening security, and expanding automation to accelerate release cycles.

April 2026

32 Commits • 10 Features

Apr 1, 2026

April 2026 monthly performance highlights across the ASFHyP3 suite. Focused on delivering measurable business value through performance optimization, cost management, deployment automation, and data-processing enhancements. Notable outcomes include significant INSAR_GAMMA optimizations, cost-reducing compute environment changes for DAAC/EDC, deployment configuration improvements with HyP3 v10.16.2, 2x2 patch phase unwrapping to improve InSAR accuracy, and new NISAR-py/GIBS capabilities. These efforts were complemented by code cleanup, runtime improvements, and governance enhancements (documentation templates, CI/CD improvements, and On-Demand credits policy updates).

March 2026

10 Commits • 3 Features

Mar 1, 2026

March 2026 (2026-03) monthly summary for ASFHyP3/hyp3. Focused on delivering scalable compute and deployment capabilities, improving stability, and enabling cost-efficient operation. Key outcomes include: 1) Compute Environment Standardization and INSAR_ISCE_BURST Support; standardized compute environments across job specs, introduced on-demand resource usage for select jobs, and added INSAR_ISCE_BURST job specification. 2) DAAC/Plus Deployment Resource Optimization and Capacity Scaling; upgraded deployment configurations to newer instance families (r8id) and expanded available instance types (12x, 16x) to raise throughput and scalability. 3) Code Cleanup and Dependency Maintenance; removed unused imports and updated Flask to 3.1.3 for security and stability. These changes reduce operational risk, improve performance, and enable better cost management for peak workloads.

February 2026

6 Commits • 2 Features

Feb 1, 2026

February 2026 delivered tangible scalability, security, and data-delivery enhancements across ASFHyP3/hyp3 and nasa/harmony. Key deployment improvements added new compute instance types for flexible DAAC-managed workflows, while the NISAR-py service gained production/UAT readiness and queue integration for timely access to GIBS-compliant browse imagery. Security and dependency stability were reinforced through targeted patches and changelog updates, aligning with 10.13.1 changes and improving overall vulnerability posture.

December 2025

3 Commits

Dec 1, 2025

December 2025 monthly summary for ASFHyP3/hyp3 focusing on ScaleCluster stability and documentation hygiene. Delivered a critical bug fix to prevent unnecessary scaling when vCPU increases are marginal, reducing resource churn and operational cost; cleaned up documentation and formatting to improve maintainability and readability; preserved code quality and traceability with clean commits and issue linkage.

November 2025

13 Commits • 6 Features

Nov 1, 2025

Highlights from 2025-11 include authentication reliability improvements, cost-conscious policy updates, release automation, and stability hardening across the Hyp3 suite. Implemented cumulus-based user authentication, automated PyPI publishing on release tagging, updated HyP3 credit policy and user-facing docs, tuned deployment resource limits with lower default credits, and fixed ScaleCluster disruption scenarios. These changes reduce user friction, lower operational overhead, and accelerate secure releases while maintaining high-quality documentation and tooling.

October 2025

21 Commits • 7 Features

Oct 1, 2025

October 2025 performance snapshot: Across ASFHyP3 repositories, delivered key deployment simplifications, resource optimizations, workflow modernization, and security hardening, while expanding user-facing capabilities and maintaining high documentation quality. The work emphasizes business value through cost efficiency, reduced operational risk, and improved usability. Key outcomes: - Consolidated and simplified deployment configurations by removing legacy hyp3-opera deployments and related OPERA_RTC_S1_SLC job spec and compute environment, streamlining CI/CD and reducing maintenance surface. (Commit: 11815834b3ef1934b7abf02cba2553fe57ec18db) - Optimized resource usage for production: reverted CPU scaling changes and reduced required_surplus for hyp3-edc-prod, lowering cloud costs while preserving performance. (Commit: c661dc25cbfb8aa039c4c3831f111ad0f436b89e) - Expanded capability with ARIA_S1_GUNW: added job type to plus-prod and plus-test, enabling broader processing options and improved user workflows; changes documented in CHANGELOG. (Commits: 661788709f31f01bf53584e2c3ef3d64e65d6303; 5b37f87180b31dd6c9f67cdefbe9336524fd66f3) - Modernized interferometric processing: hyp3-isce2 workflow modernization consolidates single- and multi-burst processing, deprecates legacy paths, and improves TopsApp UX and CLI polish for maintainability and user experience. (Commits include: fbe961990579f26dc5b94b45e54ba07f51f805c4, b16480134b3f094c6d7b85f8b5ac6c4501daf413, af50e7f7ff8b635cdf2c3232b0e738d3be2710b1, 44f330f83cca5b130f1ba1de57191f032258be21, etc.) - Strengthened security posture: removed ESA credentials from job specifications (RAiDER v0.5.5) to mitigate credential leakage and related errors. (Commit: eadbfad4cd37bf8e525f8019336554ebe2c95c41) Overall impact: - Reduced deployment complexity and operational risk, achieved cost savings through resource optimization, and delivered new processing capabilities and improved user experience. Maintained thorough documentation updates and API guidance to support developer productivity. Technologies/skills demonstrated: - Kubernetes/Deployment configuration, CI/CD hygiene, resource management (vCPUs), security hardening, workflow modernization, TopsApp UX enhancements, documentation discipline, API usage patterns.

September 2025

4 Commits • 1 Features

Sep 1, 2025

September 2025 monthly summary for ASFHyP3/hyp3: Delivered scalable production resource improvements for Hyp3 Opera, increasing production capacity to 12,000 vCPUs, removing 4xlarge instance types from deployments, and enhancing resource allocations for OPERA_RTC_S1_SLC jobs across production and testing environments. Updated product lifetime and compute environment configurations to reflect new capacity and workloads. Updated CHANGELOG with these changes. Result: higher throughput for production workloads, improved resource utilization, and clearer governance through updated documentation.

August 2025

5 Commits • 2 Features

Aug 1, 2025

August 2025: Delivered unified Publish step across OPERA_RTC_S1_SLC and ARIA_S1_GUNW/INSAR_ISCE workflows; aligned compute environments and updated changelog/IAM to support consistent release behavior. Implemented OPERA deployment resource optimization by revising instance types to improve compute efficiency and reduce costs. Resolved changelog conflict and completed changelog updates to ensure accurate release notes. Demonstrated strong collaboration across repositories and release engineering discipline.

July 2025

8 Commits • 3 Features

Jul 1, 2025

July 2025 monthly work summary for ASFHyP3/hyp3: Focused on scaling reliability, deployment automation, and pipeline hygiene to improve throughput, predictability, and production safety for OPERA workloads. Delivered multi-environment production deployment readiness and CI/CD workflow alignments, with explicit commits tracked for traceability.

June 2025

40 Commits • 10 Features

Jun 1, 2025

June 2025: Key security, processing, reliability, and documentation improvements across the ASFHyP3 repository suite. Delivered a secure, token-based Earthdata Login authentication with header and cookie support and updated OpenAPI; expanded OPERA_RTC_S1 processing bounds north of -60° latitude with tests and release notes; improved GUNW and Opera RTC documentation; hardened download reliability in burst2safe via cookie-based session reuse and log fixes; upgraded core dependencies (hyp3lib, isce2) and added Python 3.12 support; packaging/CI enhancements in conda-forge/staged-recipes; ongoing changelog maintenance and SDK-related notes.

May 2025

2 Commits • 2 Features

May 1, 2025

May 2025 focused on dependency upgrades and capacity expansion to support higher production throughput. Key features delivered include upgrading Hyp3lib to v4 for hyp3-isce2 and increasing default, expanded, and required vCPUs for the edc-prod deployment in hyp3, with associated workflow and changelog updates. Major bugs fixed: none reported this month; work concentrated on capacity improvements and maintainability. Overall impact: improved production processing capacity, better compatibility with the latest libraries, and more robust deployment processes. Technologies/skills demonstrated: Python packaging and dependency management, YAML-based CI/CD workflows, environment constraint management, and changelog maintenance.

April 2025

15 Commits • 8 Features

Apr 1, 2025

April 2025: Strengthened geospatial processing reliability, packaging validation, and release governance across the ASFHyP3 suite. Delivered Sentinel-1C data support in RTC_GAMMA and INSAR_GAMMA with updated validation logic and job specs; expanded test coverage for antimeridian handling; and improved code quality through lint/test cleanups. Updated DEM GeoTIFF behavior and release notes to reflect Sentinel-1C workflow changes. Enhanced packaging validation for InSAR workflows with comprehensive test data artifacts. Implemented governance changes to prevent ARIA_S1_GUNW outputs from publishing and upgraded tooling to ensure stable builds.

March 2025

25 Commits • 8 Features

Mar 1, 2025

March 2025 performance and delivery summary for ASFHyP3 suite. This month focused on deployment reliability, data processing resilience, and developer experience improvements across multiple repos. Key outcomes include deployment simplification for start-execution, backend optimizations for handling large payloads, lifecycle enhancements for OPERA_DISP_TMS, and compute resource scaling for long-running analytics, complemented by SDK and documentation quality improvements that reduce operational risk and speed up feature delivery.

February 2025

27 Commits • 13 Features

Feb 1, 2025

February 2025 (ASFHyP3/hyp3) focused on stabilizing deployments, expanding configurability, and enabling larger-scale data processing. Key feature deliveries optimized performance, access control, and parameterization across hyp3 workflows, while a broad set of bug fixes reined in regressions and improved deployment reliability. The work tightened security, reduced maintenance overhead, and laid groundwork for larger datasets and multi-principal collaboration.

January 2025

14 Commits • 7 Features

Jan 1, 2025

January 2025 monthly summary: Delivered deployment enhancements, automation improvements, governance updates, and critical bug fixes across ASFHyP3 projects, driving faster UAT readiness, reliable deployments, and stronger collaboration. Work spanned hyp3, hyp3-isce2, hyp3-docs, and NASA Harmony integration, with targeted commits enhancing deployment environments (edc-uat and sandbox) and updating policy/docs for clarity and compliance.

December 2024

1 Commits • 1 Features

Dec 1, 2024

December 2024 monthly summary for ASFHyP3/hyp3-docs focused on delivering a key feature and improving discoverability of Burst InSAR resources, with clear documentation updates and traceability.

November 2024

4 Commits • 3 Features

Nov 1, 2024

November 2024 focused on enabling the Opera RTC S1 Browse service in harmony, upgrading the deployment environment for Hyp3, and expanding regression testing to ensure reliability. Delivered production-ready configuration for the new browse service, enhanced test coverage, and migrated deployments to AL2023 to improve security and performance. Added regression testing coverage for Opera RTC S1 Browse with a Jupyter notebook and updated workflows to ensure ongoing validation of the browse component across the Harmony ecosystem.

October 2024

1 Commits • 1 Features

Oct 1, 2024

Month: 2024-10 — Focused on delivering a new configuration for Harmony's Opera RTC S1 Browse service under nasa/harmony, enabling standardized browse operations and future extension.

Activity

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Quality Metrics

Correctness94.6%
Maintainability94.0%
Architecture92.2%
Performance92.0%
AI Usage20.4%

Skills & Technologies

Programming Languages

BashHTMLJSONJavaScriptJinja2Jupyter NotebookMakefileMarkdownPNGPython

Technical Skills

API DevelopmentAPI IntegrationAPI integrationAWSAWS DeploymentAWS IAMAWS LambdaAuthenticationBackend DevelopmentBug FixCI/CDCLI developmentCloud ComputingCloud DeploymentCloud Infrastructure

Repositories Contributed To

10 repos

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

ASFHyP3/hyp3

Nov 2024 May 2026
17 Months active

Languages Used

MarkdownYAMLBashJSONJinja2ShellMakefilePython

Technical Skills

CI/CDCloud InfrastructureDevOpsAWSAWS DeploymentCode Review Management

ASFHyP3/hyp3-docs

Dec 2024 Jun 2026
8 Months active

Languages Used

MarkdownJupyter NotebookPythontextJavaScriptYAML

Technical Skills

DocumentationCode Repository ManagementDocumentation ManagementTechnical WritingPythonbackend development

ASFHyP3/hyp3-isce2

Jan 2025 Oct 2025
5 Months active

Languages Used

MarkdownPythonHTMLPNGXMLYAMLTOML

Technical Skills

Backend DevelopmentData EngineeringCode LintingData PackagingInSAR Data ProcessingRefactoring

ASFHyP3/hyp3-gamma

Apr 2025 Apr 2026
2 Months active

Languages Used

MarkdownPython

Technical Skills

Code LintingDocumentationGeospatial AnalysisGeospatial Data ProcessingPythonTesting

nasa/harmony

Oct 2024 Apr 2026
5 Months active

Languages Used

YAMLTypeScriptMarkdownPython

Technical Skills

Configuration ManagementDevOpsBackend DevelopmentTestingDocumentationCloud Services

ASFHyP3/burst2safe

Jun 2025 May 2026
3 Months active

Languages Used

MarkdownPythonTOMLYAML

Technical Skills

API IntegrationBackend DevelopmentBug FixCI/CDDependency ManagementDocumentation

ASFHyP3/hyp3-sdk

Mar 2025 May 2026
4 Months active

Languages Used

PythonMarkdownYAML

Technical Skills

API IntegrationBackend DevelopmentCode QualitySDK DevelopmentTestingDocumentation

nasa/harmony-regression-tests

Nov 2024 May 2026
3 Months active

Languages Used

PythonShellYAMLMarkdownJSON

Technical Skills

CI/CDPython DevelopmentRegression TestingTestingPythondata analysis

conda-forge/staged-recipes

Jun 2025 Jun 2025
1 Month active

Languages Used

YAML

Technical Skills

CI/CDPackage Management

aws/aws-cli

Mar 2025 Mar 2025
1 Month active

Languages Used

rst

Technical Skills

Documentation