Christian is available for hire

Christian Loef

Verified Expert in Engineering

Back-end Developer

Düsseldorf, North Rhine-Westphalia, Germany

Toptal member since January 4, 2022

Expertise

Serverless Amazon API Full-stack Node.js Amazon Web Services (AWS)AWS Lambda Amazon S3 (AWS S3)React TypeScript Code Review OpenAI GPT-4 API NoSQL GraphQL

Bio

Christian is a senior back-end developer with six years of experience building applications for SME companies in Germany and Hong Kong. He specializes in cloud and serverless technology with a focus on AWS. Christian loves to work on applications built for users that are smooth to work with.

Portfolio

tecRacer

JavaScript, Node.js, AWS Lambda, Amazon DynamoDB, Amazon API...

Piloteers

AWS Lambda, Amazon DynamoDB, Amazon API, Amazon CloudFront CDN...

Experience

Development - 6 years Serverless - 5 years Amazon DynamoDB - 5 years AWS Lambda - 5 years React - 5 years TypeScript - 3 years AWS Cloud Development Kit (CDK) - 2 years

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Serverless, AWS Cloud Development Kit (CDK), TypeScript, REST, HTML, AWS AppSync, GraphQL, Next.js, Full-stack

The most amazing...

...technology I've learned is the AWS cloud and the related serverless solutions that you can build. No need to focus on scalability and availability anymore.

Work Experience

Cloud Consultant and Trainer

2019 - 2020

tecRacer

Tracked and fixed bugs using Jira as a reporting tool.
Oversaw the development process of the front and back end for multiple web applications.
Developed an app that helps users manage their company savings and display their pensions.

Technologies: JavaScript, Node.js, AWS Lambda, Amazon DynamoDB, Amazon API, Amazon CloudFront CDN, Amazon S3 (AWS S3), Amazon Cognito, TypeScript, Python, Git, NoSQL, SQL, Amazon Web Services (AWS), AWS Amplify, Architecture, APIs, AWS Cloud Development Kit (CDK), CI/CD Pipelines, Development, HTML5, Instructor-led Training (ILT), Lambda Architecture, Information Technology, CSS, Lambda Functions, API Integration, HTML, AWS AppSync, GraphQL, Next.js, Full-stack, Express.js, OpenAI GPT-4 API, PostgreSQL, Code Review, Documentation, System Design

Full-stack Developer

2017 - 2019

Piloteers

Planned and developed multiple production apps for small and medium enterprises.
Analyzed the customer requirements and implemented those requirements in the front- and back-end areas.
Commissioned and maintained software products as part of my role.
Created an internal tool to simplify development processes.

Technologies: AWS Lambda, Amazon DynamoDB, Amazon API, Amazon CloudFront CDN, Amazon S3 (AWS S3), Amazon Cognito, Node.js, TypeScript, React, Redux, Python, SQL, NoSQL, Amazon Web Services (AWS), APIs, Architecture, CI/CD Pipelines, AWS CloudFormation, CSS, Git, HTML5, Development, Information Technology, API Integration, HTML, AWS AppSync, GraphQL, Next.js, Full-stack, Express.js, Code Review, Documentation, System Design

Experience

Yacht Booking Platform

https://myachts.life

An entirely serverless platform for yacht booking.

I was the back-end developer and planned new features based on customer requests. I also focused on the model planning for the communication with the front end.

Business Model Application

https://tool.businessattack.com/

This service helps to create business models through the business model canvas. Users can create teams, manage boards, share them with people, and contribute in real time. Notes and comments can be added to each team on a board, and it's possible to drag and drop items from one part of the canvas to another section.

Education

2019 - 2021

Master's Degree in Information Technology and Management

University of Applied Sciences Wismar - Wismar, Germany

2014 - 2019

Bachelor's Degree in Information Technology

University of Applied Sciences Düsseldorf - Düsseldorf, Germany

Certifications

JANUARY 2023 - JANUARY 2026

AWS Certified Developer Associate

AWS

DECEMBER 2022 - DECEMBER 2025

AWS Certified Solutions Architect Professional

AWS

JUNE 2020 - DECEMBER 2025

AWS Certified Solutions Architect Associate

AWS

MARCH 2020 - PRESENT

AWS Authorized Instructor – Champion

AWS

Skills

Libraries/APIs

Node.js, React, AWS Amplify, REST APIs, Mustache

Tools

Amazon CloudFront CDN, AWS AppSync, AWS Cloud Development Kit (CDK), Amazon Cognito, Git, AWS CloudFormation

Languages

TypeScript, Python, HTML, GraphQL, SQL, JavaScript, CSS, HTML5

Paradigms

Lambda Architecture, REST

Platforms

AWS Lambda, Amazon Web Services (AWS)

Storage

Amazon DynamoDB, Amazon S3 (AWS S3), NoSQL, PostgreSQL

Frameworks

Next.js, Express.js, Redux

Industry Expertise

Accounting

Other

Serverless, Amazon API, Lambda Functions, API Integration, Full-stack, System Design, Architecture, CI/CD Pipelines, APIs, Infrastructure as Code (IaC), OpenAI GPT-4 API, Code Review, Documentation, Development, Instructor-led Training (ILT), Electrical Engineering, Information Technology, IT Management, WebSockets, Amazon Cognito User Pools, Cloud

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