Dan Carreras

Independent Developer & Contractor

I design, build and operate my own products and take on client work, owning each one end to end: product, code, infrastructure and store release.

• Tickbase (flagship): a full-featured to-do and productivity app (tasks, habits, focus timer, calendar, shared lists, reviews) on one TypeScript codebase across web, Mac, Windows, Linux, iOS and Android. Encrypted, offline-first sync runs on a serverless Cloudflare Workers and D1 backend.
• Noteshire: live multilingual meeting transcription with mixed-language support and Claude-generated summaries. Railway backend.
• Voreum and Forever Letter: a media tracker on Supabase/Postgres, and a time-capsule letters service on Workers, D1 and R2.
• Speech recognition API (contract): sign-up and usage API for deferred and real-time Vietnamese/English speech recognition, built with JavaScript and FastAPI on PostgreSQL.
• Games: released Fenced In on Steam. The Lonely Meadow launches on Steam on 18 Nov 2026.

Technologies

• TypeScript
• JavaScript
• React 19
• React Native
• Expo
• Tauri 2
• Vite
• Tailwind CSS
• Node.js
• Hono
• Cloudflare Workers
• Cloudflare D1
• Cloudflare R2
• Cloudflare Pages
• Supabase
• PostgreSQL
• Railway
• Python
• FastAPI
• Claude API
• Speech-to-text
• GitHub Actions
• Vitest
• Unity 6
• C#
• Steamworks
• App Store Connect
• Google Play Console

Software & Security Consultant

Two engagements for the same client. I built a mobile inventory system they now rely on daily, and I led their response to a ransomware attack.

• Inventory scanner app: a cross-platform scanning app with a self-hosted server and licensing service. It has helped the company scan 2M products per month on 50+ ordinary phones, saving thousands of dollars in dedicated hardware.
• Incident response (Feb – Mar 2026): after a breach and ransomware attack, I led the response from first investigation through to a hardened, automated estate.
• Investigated the breach and supported staff through the incident, then cleaned up affected systems.
• Rolled out current security best practice across all 250+ machines.
• Built fleet-wide automation with Action1 and PowerShell: Microsoft Defender audits, forced scans and Kaspersky KVRT sweeps, with results reported to a central collector service.
• Designed and introduced new backup policies so the business can recover quickly from any future attack.

Technologies

• React Native
• iOS
• Android
• Barcode scanning
• REST API
• Licensing server
• Node.js
• Express
• Railway
• PowerShell
• Action1 RMM
• Microsoft Defender
• Kaspersky KVRT
• Windows endpoint management
• Incident response
• Ransomware recovery
• Backup & disaster recovery

Senior DevOps Engineer & QA Lead

I joined Lexacom in customer support and worked my way up to running its build, release and quality processes. Along the way I learned the product from the customer's side first: the support calls, the edge cases, and the documentation people actually need.

1. Customer SupportFront-line support; wrote much of the product and support documentation
2. SpecialistPromoted within two years
3. QATesting, test automation and release sign-off
4. DevOps EngineerCI/CD, infrastructure and cloud migration
5. Senior DevOps Engineer & QA LeadLed dev and ops processes for the development team

• Wrote a large body of customer-facing and internal documentation, which became the knowledge base support and new staff relied on.
• Played a central role in the infrastructure for Lexacom's migration to the cloud, balancing what colleagues and customers expected along the way.
• Built the CI/CD pipeline in Jenkins and Groovy, later moving continuous delivery to Azure DevOps Pipelines.
• Auto-scaled Azure customer databases based on usage, saving over £50,000 a year in platform costs.
• Led development and operations processes within the development team.
• Dockerised internal tools to make onboarding new staff fast and consistent.
• Improved the automated test and simulation frameworks.

Technologies

• Azure
• Azure DevOps Pipelines
• Terraform
• Bicep
• Infrastructure as Code
• Jenkins
• Groovy
• CI/CD
• Docker
• Ansible
• Linux
• Ubuntu
• Debian
• Bash
• PowerShell
• Apache2
• MySQL
• SQL
• Elasticsearch
• Search Guard
• RabbitMQ
• NSIS
• C#
• Visual Studio
• Git
• JIRA
• Test automation

The Lonely Meadow

A calm flight game about bringing a British meadow back to life. Out 18 November 2026.

Technologies

• Unity 6
• C#
• VFX Graph
• Steamworks

Tickbase · Noteshire · Voreum · Forever Letter

See studio.caesoose.com/software for details.

Technologies

• TypeScript
• React
• Expo
• Tauri
• Cloudflare Workers
• Supabase
• Railway
• Claude API

Fenced In

A pen-herding puzzle game with ten kinds of animals and items.

Technologies

• Unity
• C#
• Steamworks

Media Memento

A media tracker that drew on multiple APIs. It was the predecessor of Voreum.

Technologies

• .NET MAUI
• C#
• iOS
• REST APIs

Popcorn Simulator

Built and shipped in four weeks.

Technologies

• Unity
• C#
• iOS
• Android

Twixel

Over 50,000 copies sold on Steam. Ported to iOS and Android with Xcode and Android Studio.

Technologies

• Unity
• C#
• Xcode
• Android Studio
• Steamworks

Computing

The course spanned modules from programming to 3D modelling and covered every stage of the development life cycle. It led directly to my first released game.