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Andrew Johnston

PROFILE

Andrew Johnston

Andrew Johnston engineered scalable geospatial data processing and deployment solutions across the ASFHyP3/hyp3 repository, focusing on cloud infrastructure, authentication, and workflow modernization. He delivered robust API integrations and automated CI/CD pipelines using Python and YAML, optimizing resource allocation and reducing operational costs. His work included implementing token-based authentication, expanding processing bounds for OPERA_RTC_S1, and unifying publish workflows for OPERA and ARIA jobs. Andrew modernized interferometric processing in hyp3-isce2, improved documentation, and enhanced deployment reliability through configuration management and DevOps practices. His contributions demonstrated technical depth, addressing both backend performance and maintainability for production-grade scientific data services.

Overall Statistics

Feature vs Bugs

75%Features

Repository Contributions

183Total
Bugs
24
Commits
183
Features
72
Lines of code
46,493
Activity Months15

Work History

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

Correctness94.0%
Maintainability94.2%
Architecture91.8%
Performance91.4%
AI Usage20.2%

Skills & Technologies

Programming Languages

BashHTMLJSONJinja2Jupyter NotebookMakefileMarkdownPNGPythonShell

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 Dec 2025
13 Months active

Languages Used

MarkdownYAMLBashJSONJinja2ShellMakefilePython

Technical Skills

CI/CDCloud InfrastructureDevOpsAWSAWS DeploymentCode Review Management

ASFHyP3/hyp3-docs

Dec 2024 Nov 2025
6 Months active

Languages Used

MarkdownJupyter NotebookPythontext

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/burst2safe

Jun 2025 Nov 2025
2 Months active

Languages Used

MarkdownPythonTOMLYAML

Technical Skills

API IntegrationBackend DevelopmentBug FixCI/CDDependency ManagementDocumentation

ASFHyP3/hyp3-sdk

Mar 2025 Nov 2025
3 Months active

Languages Used

PythonMarkdown

Technical Skills

API IntegrationBackend DevelopmentCode QualitySDK DevelopmentTestingDocumentation

ASFHyP3/hyp3-gamma

Apr 2025 Apr 2025
1 Month active

Languages Used

MarkdownPython

Technical Skills

Code LintingDocumentationGeospatial AnalysisGeospatial Data ProcessingPythonTesting

nasa/harmony

Oct 2024 Jan 2025
3 Months active

Languages Used

YAMLTypeScriptMarkdown

Technical Skills

Configuration ManagementDevOpsBackend DevelopmentTestingDocumentation

conda-forge/staged-recipes

Jun 2025 Jun 2025
1 Month active

Languages Used

YAML

Technical Skills

CI/CDPackage Management

nasa/harmony-regression-tests

Nov 2024 Nov 2024
1 Month active

Languages Used

PythonShellYAML

Technical Skills

CI/CDPython DevelopmentRegression TestingTesting

aws/aws-cli

Mar 2025 Mar 2025
1 Month active

Languages Used

rst

Technical Skills

Documentation

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