codeboost

Daniël ter Horst

Freelance Software Developer

Email daniel@codeboost.nl

Phone +31634377858

LinkedIn danielterhorst

GitHub danielterhorst

Address Boterkorfhoek 33, 7546 JC Enschede, Netherlands

Born 3 Aug 1986 (39)

Profile

I am a driven software developer with analytical abilities and experience in building web applications, application programming interfaces and command line tools. In total, I have over 20 years of relevant work experience.

Work Experience

Software Developer, Technical Lead Apr 2021 - Jun 2026 (5y)

Antagonist / group.ONE, Enschede, Netherlands

Develop and maintain primary back- and front-end system
Design and build multiple projects from the ground up
Technically lead and coach the software development team

Freelance Software Developer Jan 2020 - Apr 2021 (1y, 3m)

Code Boost, Enschede, Netherlands

Upgrade a large production app's major Python and Django version
Support the migration of a self-hosted application to K8s on GCP
Finish and implement a pricing service into a production reseller platform
Refactor multiple parts of an existing code base to the current needs
Design and build a serverless app to send and receive text (SMS) messages

Software Developer, Software Development Manager, Scrum Master Jan 2016 - Nov 2019 (10m)

Patchman B.V. / SiteLock, Enschede, Netherlands

Evaluated and improved performance of development team
Lead and coached Scrum adoption within the company
Communicate with and aid the CEO directly
Identified process problems and designed and implemented solutions
Responsible for the day to day operations and deployments
Built new and refactored existing software considering security
Optimized software performance by identifying and solving problems
Containerized the local development and test environment
Completed Scrum.org Professional Scrum Master 1 (PSM-1) course

Analyst and Software Developer Jul 2010 - Dec 2015 (5y, 6m)

Yourhosting / Resello, Zwolle, Netherlands

Worked on and built new software using PHP, Python and JS
Designed and built Resello (startup)
Imported huge data sets from NuNames, ResellerClub and Starthosting
Refactored CRM for better scalability and usability
Refactored in use (production) REST API's
Built a leave and absence registration system
Built software to provision and manage VPS'es

Software Developer Dec 2009 - Jul 2010 (7m)

Prioserve Internetdiensten, Rotterdam, Netherlands

Built a CRM and financial management system using PHP
Installed and managed servers in different datacenters
Handled administrative processes for registering domain names
Handled customer support by telephone and email

Owner Aug 2009 - Jul 2012 (2y, 10m)

Audis, Rotterdam, Netherlands

Automated selling of domains and webhosting
Set-up and provided datacenter co-location space

Systems Engineer & Software Developer Aug 2008 - Sep 2009 (1y, 1m)

GrafiX Internet BV, Capelle a/d IJssel, Netherlands

Built automated unattended building entry by customers using PHP
Installed and managed datacenter equipment
Replaced core switches (wiring, configuration, fail over)
Installed a network connected fire alarm system
Provided customer support (tours, new installations, telephone, email)

Skills

Software Development 100%

Tooling, System Architecture, Design Patterns, Refactoring, Coaching, Guidance, Java, Ruby, Perl, C#, Go, REST APIs, SOAP, JSON, XML, YAML, Mocking, Testing, TDD, OOP, Socket Programming, Message Queues, RabbitMQ, Temporal, OpenFGA, Stripe, IntelliJ IDE, VSCode, Pub/Sub, Microservices, VPS, Hosting, Domains, Refactoring, AI, OpenAPI, Mkdocs, Zensical, Markdown, SSR, SSG

Python: Django, Flask, WSGI, ASGI, Virtualenv, Coroutines, Sphinx, PEP-8, uv, Black, pre-commit, Playwright, asyncio, OOP, ORM, Celery, RQ, Bandit, Uvicorn, Gunicorn, uWSGI

PHP: Zend, CakePHP

JavaScript: Node.js, Express.js, ESLint, TSLint

Rust: Loco, Axum, Actix, Tokio, Serde

Elixir: Phoenix Framework

User Interface & User Experience 80%

HTML, CSS, JavaScript

Markup & Styling: HTML5, Sass, Tailwind CSS, Twitter Bootstrap, Material UI, Responsive

JavaScript: ES6, React, Next.js, Vue, Nuxt, Svelte, SvelteKit, Astro, Alpine.js, HTMX, jQuery, Lodash, AJAX, Tauri, Vite, esbuild, SWC, Babel, Gulp, Webpack, pnpm, Yarn

Tooling: Figma, Sass

Continuous Integration & Deployment 80%

Build, Deploy, Quality, Security, Stability

CI / CD: Jenkins, TeamCity, GitLab, DTAP, SSH, DevOps

Version Control: Git, Mercurial, Subversion, GitHub, BitBucket, GitLab

Python: Fabric, Paramiko

DevOps 80%

Security, Application Performance Monitoring (APM), Replication, Load Balancing, Connection Pooling, Bash, DNS

Operating Systems: Linux, macOS, Windows

Databases: PostgreSQL, MySQL, MariaDB, MongoDB, SQLite, Redis, Firebase

Containers & VMs: Docker, Docker Swarm, Docker Machine, Docker Compose, Podman, Kubernetes, Kustomize, KVM, Containerization, Traefik

Webservers: Nginx, Nginx Unit, Apache

Hosting: DirectAdmin, cPanel, Plesk

Cloud & Ops: GCP, AWS, Cloud services, SSL, SSH, YubiKey, New Relic, Sentry, 2FA

Project Management 70%

Scrum, Agile, Shape Up

Tools: Professional Scrum Master (PSM), Jira, Trello

Education & Certification

Professional Scrum Master 1

Scrum.org · 2019

MBO IT 4, IT Management

Deltion College, Zwolle · 2004 - 2008

Cisco CCNA 2

Deltion College, Zwolle · 2004

Cisco CCNA 1

Deltion College, Zwolle · 2004

Languages

Achievements

Successfully built multiple multi-level reseller platforms with a small team in a little over a year's time
Doubled company's revenue with a team of only three, two years in a row
Promoted from developer to development team manager within three years
Involved in the development of multiple start-ups to multimillion dollar businesses
Automated multiple CI/CD pipelines including building, testing and deployment
Successfully led a zero-downtime migration of a monolithic application

Strengths

Self-learningPragmatismTeamworkAnalyticalResponsibilityPerfectionistAdaptableReliableExperiencedIndependentFriendly