Product Development
New builds from idea to production: clean, maintainable software across the full stack, shipped with the CI/CD and DevOps to keep it running.
● Currently on assignment, not available
Hello, I'm Daniël ter Horst.
I build clean software
and solve complex problems.
I'm a Software Developer
Code Boost is my freelance practice. I love designing and building software, I love solving complex puzzles, and I love a good challenge. I think programming is an art, and less is more. I want to improve your business by doing what I do best.
01
About
I'm a freelance software developer based in Enschede, the Netherlands, and happy to travel, work on location, or go hybrid. I work on the whole lifecycle, from system architecture and design patterns to refactoring and coaching teams to write better code.
On the backend I primarily work with Python, but I recently started using the excellent Elixir and Phoenix Framework combination. On the front end I use React with Tailwind and really enjoy Svelte with SvelteKit. In recent years I've been utilizing HTMX to do server-side rendering with Django. In between I handle the CI/CD and DevOps that keep things shipping. Whatever the stack, I want code that is simple and easy to maintain.
- Programming is an art, and readable code matters.
- Less is more. I'd rather cut complexity than add it.
- I like a challenge, and the harder the puzzle the better.
Languages
- Dutch Native
- English Fluent (full professional)
02
Services
How I can help, from first commit to a healthier codebase.
Modernization & Refactoring
Bringing legacy code back to health: framework and dependency upgrades, database migrations, and disciplined refactoring without breaking what works.
Architecture & Code Review
System design and design-pattern guidance, plus code reviews that cut complexity and catch risk before it reaches production.
Team Coaching
Coaching teams on testing discipline and clean design, so delivery gets smoother and more predictable.
03
Work
A selection of work, anonymized where client details are confidential.
Multi-level reseller platform
A major-version upgrade of the application, from Python 2 and Django 1 up to Python 3 and Django 2, delivered with zero downtime and no regressions, plus new platform features and a move to the cloud.
- Upgraded every part of the application from Python 2 / Django 1 to Python 3 / Django 2
- Wrote and ran the database migrations the upgrade required
- Updated and fixed test coverage across the suite
- Extensive manual testing to ship the upgrade safely
- Rolled out with zero downtime for users
- Finished and implemented a pricing service for the platform
- Supported migrating the self-hosted application to Kubernetes on GCP
- Designed and built a serverless app to send and receive SMS messages
- Refactored multiple parts of the codebase to fit current needs
04
Skills
What I do, with the tools behind each discipline grouped by the stack they belong to.
Software Development 100%
Python
DjangoFlaskWSGIASGIVirtualenvCoroutinesSphinxPEP-8uvBlackpre-commitPlaywrightasyncioOOPORMCeleryRQBanditUvicornGunicornuWSGI
PHP
ZendCakePHP
JavaScript
Node.jsExpress.jsESLintTSLint
Rust
LocoAxumActixTokioSerde
Elixir
Phoenix Framework
User Interface & User Experience 80%
Markup & Styling
HTML5SassTailwind CSSTwitter BootstrapMaterial UIResponsive
JavaScript
ES6ReactNext.jsVueNuxtSvelteSvelteKitAstroAlpine.jsHTMXjQueryLodashAJAXTauriViteesbuildSWCBabelGulpWebpackpnpmYarn
Tooling
FigmaSass
Continuous Integration & Deployment 80%
CI / CD
JenkinsTeamCityGitLabDTAPSSHDevOps
Version Control
GitMercurialSubversionGitHubBitBucketGitLab
Python
FabricParamiko
DevOps 80%
Operating Systems
LinuxmacOSWindows
Databases
PostgreSQLMySQLMariaDBMongoDBSQLiteRedisFirebase
Containers & VMs
DockerDocker SwarmDocker MachineDocker ComposePodmanKubernetesKustomizeKVMContainerizationTraefik
Webservers
NginxNginx UnitApache
Hosting
DirectAdmincPanelPlesk
Cloud & Ops
GCPAWSCloud servicesSSLSSHYubiKeyNew RelicSentry2FA
Project Management 70%
Tools
05
Get in touch
Have a problem worth solving?
Got a new build, a tricky refactor, or a team that needs coaching? Send me a message. I'm always up for a good challenge.
daniel@codeboost.nl