George – Node.js, React, PostgreSQL

The Network-as-a-Service product line at a global wholesale telecom carrier, plus its internal automation and AI platforms. The work covered ordering and provisioning automation, a wholesale IoT product and an agentic workflow platform.

• Automated the long-standing manual ordering and provisioning process for L1 Transmission products, orchestrated with Camunda BPMN and DMN across Node.js, Spring Boot and React services.
• Designed and architected the agentic workflow platform: a Next.js portal to create and test agents and tools without redeployment, an MCP server registered with LiteLLM, RAG on PostgreSQL with pgvector and a Camunda 8 connector for agent orchestration.
• Built an AI document validation portal for BDM-to-customer mappings, cutting manual effort by up to 70%.
• Added an AI assistant to the quoting engine that returns customer quotes from a natural-language prompt instead of manual forms.
• Acted as de facto tech lead for about two years, owning sprint planning, ceremonies and delivery, and led hands-on a new wholesale IoT product designed to work with any MNO or MVNO.
• Migrated 5 core Spring Boot microservices from 2.7.x to 3.5.5.
• Added smart validation with per diem and FX rate calculations to the expense claim system, reducing support and feedback loops by 50%.

A multi-tenant SaaS that digitizes the full operations of a German property management company, from tenant acquisition through contracts, deposits and accounting. Two engineers shipped 150+ production features and fixes across the stack, with weekly delivery directly to stakeholders.

• Shipped 150+ production features and fixes across the full stack as one of two core engineers, delivering weekly directly to stakeholders.
• Owned features end to end: data modeling, migrations, API, UI, tests, production deploys and runbooks.
• Built the project's QA foundation: first CI test gates, an isolated end-to-end regression suite and AI-assisted adversarial test generation that caught a privilege escalation vulnerability before release.
• Built the gated CI/CD promotion pipeline across dev, staging and production with release tagging and a rollback strategy.
• Integrated regulated third parties: credit bureaus, banks, payment and escrow providers, e-signature and messaging platforms.
• Implemented role-based access control and GDPR compliance, including data retention, audit trails and credit-data gating.
• Delivered tenant acquisition, contract lifecycle (AI-assisted contract import, e-signature) and deposit and banking features.

A property management and short-term rentals platform. The engineer joined a senior team in a hands-on consulting capacity, part-time at first with a period of full-time work.

• Maintained and extended the platform across the Vue and TypeScript frontend and the PHP (Symfony) backend.
• Diagnosed and resolved production bugs across the stack.
• Ran technical discoveries and spikes to assess feasibility and shape upcoming features.
• Worked with MySQL and MongoDB for persistence, AWS S3 for storage, Docker for environments and GitHub Actions for CI/CD.
• Implemented features from Figma designs.

A vehicle tracking management system for a fleet of 15,000+ cars, plus the company's data, CRM and web systems. All backend was written in Node.js and TypeScript.

• Owned the backend of the vehicle tracking system for a fleet of 15,000+ cars, built in Node.js and TypeScript.
• Integrated tracker, connectivity and ECU telemetry: tracker data stored in Amazon Timestream, ECU and connectivity data streamed through Kinesis Data Streams with Lambda consumers.
• Built real-time updates with MongoDB change streams feeding Socket.IO for live vehicle positions and sensor readings.
• Built 10+ scheduled ETL jobs and MongoDB aggregation pipelines for fleet metrics, including a CRM-to-metrics-DB sync that wrote only true deltas by comparing row fingerprints.
• Built, fixed and optimized HubSpot pipelines for Sales and Marketing.
• Built a React and Next.js QR scanning app for fast tracker-to-vehicle onboarding.
• Maintained the public website and internal tools on Vue, Nuxt, Strapi, Docker and PostgreSQL.

Fintech and enterprise projects for Greek clients: a loan-management platform for a government organisation, a SharePoint backup service, a spreadsheet transliteration tool and a customer-retention reporting application.

• Rebuilt a legacy Visual Basic desktop application as a full-stack loan-management web app on .NET 7, HTML, CSS and TypeScript (1.5 years).
• Deployed it through Azure DevOps CI/CD with self-hosted agents to on-prem IIS servers on a closed intranet.
• Built a .NET service that backs up SharePoint sites to Microsoft SQL Server.
• Built a .NET application that ingests Greek-language Excel files and returns them transliterated to Greeklish per the ISO standard.
• Built a .NET reporting application that tracks customer retention.

A German telemedicine platform for online consultations and prescriptions for medical cannabis patients. It digitized the paperwork and manual verification between patients and doctors.

• Was promoted from senior engineer to team lead, leading a team of 5 seniors and juniors.
• Worked daily with stakeholders and PMs and ran the full Scrum cycle in Jira.
• Built the mobile app in React Native and the web app in React, both in TypeScript, with a Node.js and Fastify backend on MySQL.
• Integrated a licensed FHIR-based medical CRM for patient, doctor and medical record management.
• Kept German patient medical records in Ninox DB to meet in-country data residency requirements.
• Deployed to Debian servers with GitHub Actions CI/CD and worked from Figma designs.

GIS and maritime analytics platforms for shipping companies and government clients.

• Led a small team building a maritime reporting platform covering greenhouse gas emissions, power, consumption, SFOC, AER and CII calculations and a vessel maintenance job tracker, with data ingestion from onboard IoT sensors.
• Built a GIS application for onboarding maritime companies and their fleets, with real-time positioning, geofencing, itineraries, crew management and performance reporting.
• Built fleet performance applications covering maintenance jobs, power, consumption, SFOC reporting, geofencing and heatmaps.
• Built a search and rescue GIS platform for a government client, where users write and compile their own algorithms in a sandboxed Node.js VM; it shipped with fire spread, search and rescue and drift probability algorithms.
• Built migr8 in Go to move infrastructure between Azure subscriptions and large tables between PostgreSQL instances.