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Declan Macinnis

Portland, ME, USA

DECLAN MACINNIS
Portland, ME | (603) 662-5532 | DeclanMac2@gmail.com
LinkedIn: https://www.linkedin.com/in/declan-macinnis-00323379/

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PROFESSIONAL SUMMARY
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High-impact GIS Developer and Specialist with a proven track record of
modernizing legacy spatial workflows, developing full-stack GIS applications,
and automating large-scale data pipelines. Expert in Python (Pandas, OSGeo,
GDAL, ArcPy), AWS cloud infrastructure, and enterprise GIS (ArcGIS Pro,
ArcGIS Server, WFS). Significant experience supporting the USGS National Map
and global submarine cable deployments (including linear referencing/LRS
and custom routing calculations). Specialized in database performance
optimization, cloud-native spatial architectures, and ETL modernization.

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WORK EXPERIENCE
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XTS (Contractor for USGS) -- Remote
GIS Developer | September 2025 - March 2026

* Performance Optimization: Successfully resolved critical I/O bottlenecks
and memory leaks in the Staged Product Generation (SPG) pipeline using
Python and OSGeo libraries. Configured glibc memory allocations
(MALLOC_ARENA_MAX=2), programmatically capped GDAL cache limits
(SetCacheMax), and optimized garbage collection, yielding a 35% speedup
on Windows and 16.6% on Linux for heavy vector products.
* Database Optimization: Accelerated spatial database inserts by wrapping
GDAL/OGR appends in database transactions (StartTransaction/CommitTransaction)
and optimized temporary extraction table builds by removing redundant
primary key indexing overhead.
* Full-Stack GIS Development (SPUD): Maintained and upgraded the Staged Product
User Dashboard (SPUD) React frontend, executing a major library migration
(MUI X v5 to v7) and troubleshooting complex API Gateway CORS issues
triggered by scheduler Lambdas in development.
* Cloud Infrastructure & Telemetry: Provisioned and managed Linux-based
GIS workers on AWS EC2 using Terraform and AWS Secrets Manager. Established
Linux worker observability by configuring CloudWatch Agents and custom
telemetry crash handlers to log errors.
* CI/CD & DevOps: Stabilized GitLab CI builds by optimizing environment
dependencies, Docker image layering, and externalizing heavy ArcGIS
packages via CDN import maps, eliminating frequent 2-hour pipeline
timeout failures.
* Tooling & Documentation: Upgraded legacy SPG thumbnail generation scripts
from ArcMap to ArcGIS Pro Layouts and Map Series. Authored comprehensive
system requirements, job lifecycles, and architecture documentation for the
US Topo map builder app.
* Database Automation: Developed Python-based automation (GDAL/OGR) for
3D Hydrography Program (3DHP) database updates, eliminating manual edits
across dev, stage, and prod environments.

SubCom (Subsea Fiber-Optic) -- Newington, NH
GIS Specialist | August 2022 - August 2025

* Daily ArcGIS Pro Operations: Leveraged ArcGIS Pro daily for complex spatial
analysis, route engineering, and chart/map production in a high-stakes
submarine cable deployment environment.
* Linear Referencing & Geoprocessing: Contributed to a custom ArcGIS linear
referencing (LRS) solution using loxodromic measurements to dynamically
calculate Kilometer Points (KPs) across ocean basins, providing route
engineers with precise spatial referencing along submarine cable paths.
* Tool Modernization: Replaced a legacy ArcMap cable crossing tool with a
high-performance Python implementation, exponentially reducing processing
time for route engineers and eliminating reliance on expensive Spatial
Analyst licenses.
* Spatial Automation & Utilities: Developed an automated "Overview Exploder"
tool in Python to convert ship navigation coordinates (positions, headings,
bearings, depths) to ArcGIS features, automating a manual process that
previously took 6 hours per run.
* Ocean Floor Temperature Analysis: Built a raster sampling tool to overlay
and query ocean floor temperature rasters at specified route coordinates,
generating automated PDF temperature reports for marine routing engineers.
* Database Engineering & Risk Mitigation: Spearheaded the creation of a
centralized, hosted geodatabase to catalog and track external, third-party
submarine cables. Consolidated disparate spatial formats (KML, CSV, PDF,
shapefile, CAD) into a standardized schema and deployed WFS services on
ArcGIS Server for real-time route planning collaboration with stakeholders
(e.g., Makai), mitigating critical route engineering risk (e.g., preventing
accidental cable hooks during pre-lay grapnel runs in the Mediterranean).
* Data Engineering & ETL: Automated weekly IHS Midstream global pipeline
database updates via Python (SFTP handshake, business logic, MDB conversion)
and managed large-scale bathymetry datasets from Fugro SharePoint servers.
* AIS Workflow Improvement: Streamlined Marine Liaison vessel tracking by
integrating Global Fishing Watch API alerts into ArcGIS web maps and
automating ship information lookups via IMO numbers, reducing communication
gaps.
* Field Workflow Modernization: Transformed inefficient field data collection
into a digital workflow using ArcGIS Field Maps and developed Python scripts
to automate soil resistivity calculations directly in the field.
* Legacy System Migration: Rewrote 30-year-old VBA-based macros into
OfficeScript and Python to ensure Windows 11 compatibility and future-proof
business logic.
* Binary Reverse-Engineering: Reverse-engineered proprietary MDB formats
using AI-assisted binary inspection to enable license-free data exports.
* Server Administration: Built PowerShell scripts with robocopy and Windows
Task Scheduler to automate weekly ARCS chart mirroring across production
servers.

Davey Resource Group -- Multiple US Cities
Utility Systems Specialist / GIS Field Technician | April 2019 - July 2022

* Asset Management & Mapping: Conducted high-precision utility asset
inventory (poles, lines, equipment) across multiple utility service contracts,
including Entergy, using GPS and handheld GIS devices to map electrical
network connectivity, phasing, and transformer specifications.
* Vegetation Inspection & Compliance: Assessed right-of-way vegetation to
identify trimming and brush control requirements, ensuring electrical
utility infrastructure compliance with safety and service reliability standards.
* Grid Modeling: Updated critical electrical grid infrastructure records in
GIS databases and modeled network connectivity to ensure data accuracy.
* Stakeholder Liaison: Communicated directly with private landowners to
coordinate access for utility inspections and resolve property-related concerns.
* Field Operations: Operated 4x4 vehicles and navigated rugged, remote terrain
in diverse weather conditions to perform asset inventory and contractor safety
audits.

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TECHNICAL CORE EXPERTISE
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* GIS Software: ArcGIS Pro, ArcGIS Enterprise, ArcGIS Server, ArcGIS Field
Maps, Linear Referencing (LRS), Global Mapper, FME.
* Programming & Scripting: Python (Pandas, OSGeo/GDAL, ArcPy), SQL,
PowerShell, OfficeScript, VBA.
* Cloud & Infrastructure: AWS (EC2, S3, Secrets Manager, CloudWatch, Lambda,
RDS), Terraform, Docker, GitLab CI/CD.
* Data & Databases: GeoPackage, FileGDB, SQL Server, PostGIS, SFTP
Automation, KML/CAD integration, WFS/WMS Services.
* Domain & Specialized Expertise: Submarine Cable Route Engineering, Marine
Planning & Permitting Support, GPS/GNSS Data Collection & Handheld GIS
Devices, Hazard Charting, Remote Sensing Data Integration, National Map &
3D Hydrography Program (3DHP) Support.
* Soft Skills: Technical Documentation (Jira / Wiki / System Requirements),
Cross-functional Collaboration, Process Modernization, Landowner
Communication.

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EDUCATION
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BS in Social Science, GIS Certificate | Plymouth State University (2014-2018)

Declan Macinnis

Posted 2026-06-10 under Analyst, Applications Developer, CAD, Cartography, Database, Developer, Geospatial, Information Technology, Planning, Programming, Remote Work / Freelance, Software Development, Specialist, Support, Surveying