Jonathan User
@jonathan-david-hussey
Experienced software engineer specializing in scalable APIs, event-driven data pipelines, and AI-driven systems.
What I'm looking for
I’m an experienced software engineer with 14+ years building scalable APIs, event-driven architectures, data pipelines, and cloud integrations across Government, Telecoms, Healthcare, Energy, Research, Social Analytics, Real Estate, Finance, and AI. I thrive on turning messy systems into reliable platforms through architecture, clean engineering practices, and measurable performance wins.
Most recently, I established a team’s first API platform (50+ endpoints) and built event-driven workflow engines (7+ workflow types) using .NET 9, C#, EF Core, and SQL Server—backed by CI/CD, clean architecture, strong testing, observability, and structured error handling. Previously, I drove major search and ingestion improvements at Onalytica (92% infrastructure cost reduction, 89% search latency improvement) and delivered real-time, multi-tenant AI call-management and orchestration systems using NestJS, GPT-4o, and RAG integration.
Experience
Work history, roles, and key accomplishments
Software Engineer
Technology Innovation Institute (TII)
Jun 2025 - Mar 2026 (9 months)
Established TII’s first API platform with 50+ endpoints and delivered 7 SAP enterprise integrations, replacing direct database access with structured API contracts. Built an event-driven workflow engine supporting 7+ workflow types (2–4 approval steps each) and introduced Clean Architecture, automated CI/CD, and enhanced observability for faster diagnosis of workflow failures.
Engineered AI-driven content aggregation pipelines that processed 236 RSS feeds across 6 social platforms, automating extraction, language detection/translation, and publishing to the Circle community platform. Implemented custom JavaScript transformations in Zapier and built modular per-platform tagging/organization using RSS.app to route content into dedicated Circle spaces.
Staff Software Engineer
Actualize
Jun 2024 - Mar 2025 (9 months)
Led architecture and implementation of a generative AI call management system for 7 enterprise clients, handling hundreds of outbound calls daily using NestJS, TypeScript, Node.js, MySQL, Redis, and Vapi. Built a unified orchestration layer integrating 7+ external APIs (Twilio, Vapi, Freshdesk, WhatsApp, RAG, Fareye), implemented autonomous agentic workflows with GPT-4o, and added multi-tenant aut
Senior Software Engineer
Onalytica
Aug 2019 - May 2024 (4 years 9 months)
Drove a 92% reduction in infrastructure costs and 89% improvement in search latency for the flagship product by analyzing 20+ CloudWatch metrics and optimizing Elasticsearch (index restructuring and query optimization). Eliminated recurring platform-wide outages by redesigning the core search API with a producer/consumer architecture, improved client export performance from 30 minutes to 30 second
Software Engineer
Biotronics3D
Nov 2017 - Aug 2019 (1 year 9 months)
Shipped 7+ real-time features (chat, notifications, data sync, conflict resolution, VOIP, subscriptions, presence) for a Radiology Information System used by tens of healthcare clients and supporting thousands of concurrent users. Delivered WebRTC-based VOIP with live call state tracking, implemented live data synchronization with WebSockets, and built conflict-resolution and notification framewor
Software Engineer
GE Energy
Nov 2015 - Oct 2017 (1 year 11 months)
Led end-to-end integration of Distribution Management System data into an external dashboard, delivering 6–8 real-time widgets for energy grid visibility and implementing REST services and secure inter-system communication. Resolved a long-standing UI layout defect and built a hyperparameter optimization framework to automatically select and tune 30+ machine learning models for electric load forec
Lead Frontend Software Developer
Winterwell Associates
Feb 2014 - Nov 2015 (1 year 9 months)
Built a configurable real-time dashboard framework for visualizing AI-classified social media data using drag-and-drop widgets with multiple chart/table/text visualizations and live updates. Improved cross-device usability by migrating to Bootstrap, and built real-time social media calendars and a learning centre with guided onboarding experiences.
Education
Degrees, certifications, and relevant coursework
Edinburgh Napier University
Master of Engineering (MEng), Software Engineering
2010 - 2015
Grade: First Class Honours
Master of Engineering (MEng) in Software Engineering, awarded First Class Honours. Received University Medal and British Computing Society Prize.
Edinburgh College
Higher National Certificate (HNC), Interactive Media
2010 -
Higher National Certificate (HNC) in Interactive Media.
Tech stack
Software and tools used professionally
Postman
OpenAPI
Amazon API Gateway
Highcharts
AWS IAM
Amazon CloudWatch
Amazon S3
GitHub
GitLab
GitHub Enterprise
ESLint
Prettier
scss-lint
Docker Compose
AWS CodePipeline
Jenkins
GitHub Actions
AWS CodeBuild
Less
Jupyter
NumPy
Pandas
MySQL
Microsoft SQL Server
AWS CodeDeploy
Gmail
Node.js
.NET Core
NestJS
.NET
ASP.NET Core
Bootstrap
Redis
AWS CloudFormation
AWS Cloud Development Kit
Angular Material
Angular 2
Jest
Jasmine
React
jQuery
AngularJS
axios
JavaScript
Python
HTML5
Java
CSS 3
C#
JSON
Perl
Serilog
AWS CloudTrail
TensorFlow
scikit-learn
RabbitMQ
Amazon SQS
WCF
BullMQ
Amazon SNS
Kibana
OpenTelemetry
Amazon DynamoDB
Datadog
Prisma
Amazon Kinesis
Elasticsearch
OpenSearch
AWS Lambda
TypeScript
JUnit
Visual Studio Code
Git
Docker
Twilio
WebRTC
BenchmarkDotNet
MobX
Amazon Web Services (AWS)
SQL
npm
SAP
FreshDesk
NgRx
ElevenLabs
Clerk
ArgoCD
GitHub Copilot
Vapi
Claude Code
Remote
.NET Aspire
Float
Wolverine
Availability
Location
Authorized to work in
Salary expectations
Job categories
Skills
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