André is available for hire

André Hänsel

Verified Expert in Engineering

Software Developer

Location

Münster, North Rhine-Westphalia, Germany

Toptal Member Since

February 2, 2022

André is a developer, architect, and technical product owner for various web projects in logistics, eCommerce, payment, healthcare, and many other areas. He is proficient in PHP, Go, Kotlin, JavaScript, and occasionally Rust. André sometimes uses Vue.js, PostgreSQL, Elasticsearch, and other technologies. Experienced in DevOps with GitLab and Kubernetes, André is also competent in building and supervising teams.

Web Development Cloud Architecture Internet of Things (IoT)PHP Linux MySQL CSS JavaScript SQL Node.js PostgreSQL TypeScript jQuery Android Elasticsearch PCL

Portfolio

Lunar X GmbH

Kubernetes, PHP, Laravel, Terraform, Amazon Web Services (AWS), JavaScript...

Gift Item Website

PHP, PostgreSQL, REST, OpenAPI, GraphQL

Jewelry Wholesale

Architecture, PHP, Go, Kotlin, Linux, CSS, TypeScript, JavaScript...

Experience

Linux - 20 years PHP - 20 years Elasticsearch - 7 years Go - 6 years PostgreSQL - 5 years Vue - 4 years Kubernetes - 3 years Rust - 2 years

Availability

Full-time

Preferred Environment

Windows, JetBrains, PHP, Go, Rust, Kotlin, GitLab CI/CD, Kubernetes, PostgreSQL, Linux

The most amazing...

...logistics process optimization I did increased the warehouse output by an order of magnitude, now shipping thousands of items a day.

Work Experience

PHP/Laravel Developer

2022 - 2022

Lunar X GmbH

Managed AWS infrastructure using Terraform for public-facing and internal applications.
Provided architecture for a web-based dashboard based on Vue, Vite, and Tailwind.
Continuous integration, deployment, and automated staging environments using Docker, kaniko, GitHub Actions, and Kubernetes.

Technologies: Kubernetes, PHP, Laravel, Terraform, Amazon Web Services (AWS), JavaScript, PostgreSQL, Vue, Tailwind CSS

Lead developer/solutions architect

2013 - 2022

Gift Item Website

Modeled a REST API for order processing, documented it using OpenAPI, and implemented it using PHP and Go.
Modeled a GraphQL API for a web-based dashboard and implemented it using Apollo and Webonyx.
Developed an order management platform for tracking the progress of around 5000 orders daily through various stages of validation, production, packing, and shipping.

Technologies: PHP, PostgreSQL, REST, OpenAPI, GraphQL

CTO | Software Architect

2008 - 2022

Jewelry Wholesale

Managed in-house and cloud infrastructure for handling eCommerce traffic.
Developed custom Enterprise Resource Planning (ERP) and warehouse management systems for shipping thousands of orders from a selection of hundreds of thousands of items.
Led a team developing a real-time fulfillment tracking platform to organize, prioritize and consolidate orders in warehouses, tracking picking labels and shipping documents and managing the workforce.
Developed an order management system for customized items, including tracking materials, generating print and production files, and supervising machine status.
Set up development workflows using CI/CD technologies like Docker and Kubernetes to create fully automated testing and reviewing environments, as well as automated and monitored production deploys.
Led a team developing a custom web shop system and a bespoke ERP system that deals with items that consist of thousands of different parts in millions of possible combinations.
Led a team developing custom online shops for products with complex attributes focused on great convenience and user experience.

Technologies: Architecture, PHP, Go, Kotlin, Linux, CSS, TypeScript, JavaScript, Elasticsearch, Android, MySQL, PostgreSQL, GitLab, GitLab CI/CD, Leadership, Hiring, PostScript, PCL, Node.js, Java

Experience

Custom Web Shop for Parts

I created a webshop with thousands of different items with various properties, leading to millions of interdependent combinations of properties. I focused on a short and user-friendly presentation, instantly filtering down to matching parts based on desired properties.

Scalable Custom Warehouse Management

I built a warehouse management system managing storage, production, packing, and shipping, focusing on scalability. Getting output up to ten thousand items and getting time for priority orders down to minutes.

Metrics Collection System

This is a custom metrics collection system allowing to collect thousands of data points per second and running aggregated reports on them with limited and quantifiable loss in resolution. There is an ability to calculate percentiles from raw data after the fact.

DevOps Infrastructure for a Third-party Application

I set up infrastructure for third-party software projects for continuous building, testing, deploying, and reviewing processes based on Docker, Kaniko, Kubernetes, and GitLab. This provided the ability to dynamically deploy a variety of custom environments.

Skills

Libraries/APIs

Node.js, Vue, jQuery, React, OpenAPI, PCL

Tools

GitLab CI/CD, JetBrains, Webpack, Terraform, GitLab

Languages

PHP, CSS, HTML, JavaScript, SQL, TypeScript, GraphQL, Go, Rust, Kotlin, PostScript, Java

Paradigms

REST, Responsive Layout

Platforms

Linux, Windows, Android, Google Cloud Platform (GCP), Kubernetes, WordPress, Amazon Web Services (AWS)

Storage

PostgreSQL, MySQL, Elasticsearch

Frameworks

Laravel, Tailwind CSS

Other

APIs, Responsive Web Apps, Software Architecture, Web Development, Internet of Things (IoT), Cloud Architecture, Networking, Architecture, Solution Architecture, Image Manipulation, PDF, Healthcare IT, Healthcare Management Systems, Leadership, Customer Relationship Management (CRM), Hiring

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