Principal Fullstack Engineer (f/m/d)

Trusted Shops AG • Cologne

  • Full-time


from today / asap

Your duties

Trusted Shops develops SaaS solutions for over 30 million users and 30.000 companies all over Europe. Our product suite includes products such as the Trustmark, buyer protection and the experience feedback platform eTrusted. With our products we pursue the mission to enable trust between people and businesses in the digital age over the last 20 years.

Home of our product development is the Products & Engineering department, which consists of 13 cross-functional Product-Teams across 4 Product-Domains, working in an agile environment.

We are looking for a highly skilled and experienced Principal Fullstack Engineer (f/m/d) to join our Team,

What your role's responsibilities will include:

  • As a Principal Fullstack Engineer (f/m/d), you will be responsible for providing technical guidance and leadership in a specific area of Engineering. 
  • You will work closely with one of the 13 cross-functional Product-Teams to develop and implement technical strategies and solutions that align with the organization's goals. 
  • You will also be responsible for mentoring and coaching other Engineers (f/m/d), providing technical guidance and oversight, and contributing to the development of the overall engineering culture.

What your day as a Principal Fullstack Developer (f/m/d) might look like:

  • You start your day by setting up your mobile work environment - or you set up your desk in the office.
  • You will provide technical leadership and guidance in a specific area of engineering, making technical decisions within your team and beyond in technical committees. 
  • You will develop and implement technical strategies and solutions that align with the organization's goals, while also mentoring and coaching other Engineers/Developers (f/m/d) to help them develop their technical skills. 
  • You will ensure the quality and consistency of the codebase by providing technical guidance and oversight, including participating in code reviews to ensure compliance with best practices and coding standards.
  • Lunch break! Grab a bite to eat at home or maybe gather some team members* and colleagues and explore the restaurants around the office?
  • Contribute to the development of the overall engineering culture by organizing Tech Talks, collaborating with cross-functional Teams to design and implement solutions, and working actively to reduce complexity where possible by using technological and business insights. 
  • As a thought leader in your area of expertise, you will help shape a well-defined tech landscape by sharing your insights and contributing to the tech radar.
  • Staying up to date with emerging trends and technologies in the industry is crucial, and as a Principal Developer, you will spread this knowledge across the organization.
  • Still at the office? How about a free drink on the roof terrace before you go home? And remember: We don't believe in working until the middle of the night.
  • Was today your monthly Self Education Day? In that case, there are no Meetings for you today, but a self-chosen agenda of learning and self-improvement.

Your profile

  • You have a Bachelor's degree in computer science or a related subject - a Master's degree is an advantage.
  • You have at least 10 years of experience in software development.
  • You have advanced knowledge in at least one of the following areas: React, JavaScript/TypeScript, Python, SQL.
  • Previous experience developing customer-facing analytics solutions is a must-have for this role.
  • We are looking for someone with in-depth knowledge and experience in a specific technology area (BI, Reporting Solutions).
  • You will also have strong problem solving skills and be able to solve complex problems.
  • Excellent communication skills (German/English) are required and you want to work in a team.
  • Experience with agile methods and development practices is an advantage.
  • As a Principal Engineer (f/m/d) you should have the ability to guide and coach other developers.
  • You will also have a proven track record of delivering high quality software solutions.
  • We are looking for someone who loves to learn and keeps up to date with new trends and technologies.

What we offer you

  • The freedom to do a really good job
  • New Work: work up to 100% mobile (or on-site/hybrid) within Germany and take advantage of our flexible model
  • One "Self Education Day" per month
  • 30.5 days vacation
  • Individual training opportunities
  • Health Pass (free online and offline sports, fitness and health courses)
  • Team events (summer party, Christmas party, unit events)
  • An international and diverse environment - colleagues from over 40 nations who work for 13 markets in 5 offices across Europe
  • An unique company spirit - an open error culture, enthusiasm for good results, and giving every individual room for growth


Not sure if you are what we are looking for? Apply!
At Trusted Shops, we are interested in you as a person - whether you fit in with us is
independent of gender, nationality, ethnic and social origin, religion/belief, disability, age, sexual orientation and identity. Trusted Shops is clearly committed to diversity and against discrimination.

Alessandro Canu

Alessandro Canu

Inhouse Tech Recruiter
What opportunities does "new work" offer our colleagues? Patrick tells us his story
What opportunities does "new work" offer our colleagues? Patrick tells us his story

Your benefits in tech

New work

Work from wherever you feel most comfortable. Whether in one of our 5 offices or temporary from another location in Europe.

Health Pass

Stay fit – physically and psychologically. Our company health management offers you a wide range of courses, presentations and workshops.

International flair

With a team from more than 40 different nations, it never gets boring. We celebrate our diversity and the countless new perspectives it gives us.

Individual development opportunities

Unleash your talent and improve your individual skills that support you in your work.

Buddy programme

Your buddy will help you settle in when you first start out with us. Later, you can also share your experience with new colleagues.

Team events

Whether in summer, winter or whenever it suits your team – we enjoy spending time together.


In cross-team guilds, we work on current topics in a self-organised and practical manner, e.g. in the Architecture guild or the DevOps guild


We like to think outside the box, developing useful and creative solutions to problems during small events – whether related to work or not

Peer- /mob-programming

Many people work together to develop the best code. This allows us to progress even more effectively in projects and to learn from each other.

Knowledge marketplace

Everyone can offer knowledge or search for it on a kind of bulletin board. This creates spontaneous training sessions with each other

Agile Coach

Agile coaches are available to you and your teams so that you can be successful together.

Our values


Open and clear communication gets us to our goals quickly. Address your topics openly – we will find a solution for everything together.


Every single one of our colleagues is a valuable part of our community. Respectful interaction and openness are prerequisites for our work.


We know you’re doing a great job – otherwise you wouldn't be here. We trust you, your skills, ideas and intentions.

Our application process


Are you passionate about the code behind our products?

Programming Lanugages
Programming Lanugages

Java: Java is used by some of our Tech teams and supports us with components that have complex logic, usually in combination with Spring Boot 

TypeScript: We use TypeScript combined with the Angular and React frameworks in the frontend and also on the server side with NodeJS 

Kotlin: We sometimes use Kotlin as an alternative to Java for server-side solutions and for our mobile development 

Python: We often use Python when processing or transforming data. We also occasionally write services in it with the help of AWS Lambda 


Angular: Particularly in our B2B area, we rely on Angular for our frontend in order to be able to develop interactive solutions efficiently 

React: React is used when the performance of our solutions is important. Our B2C environment, in particular, benefits from React (shop profiles, trust badges, widgets, etc.) 

Spring Boot: When it comes to complex business logic in Java and Kotlin, we use Spring Boot. It is deployed in Kubernetes clusters 

NodeJS: Our focus is on serverless, and we often use typescript in the backend. We mostly use NodeJS in combination with AWS Lambda 

Service & Tools
Service & Tools

Circle CI:  CircleCI is our CI/CD tool for automated builds, testing & deployment 

GitHub:  GitHub supports our internal open source policy and enables cross-team cooperation and feedback 

Ansible: We use Ansible to provide our virtual servers in a repeatable and automated way 

Terraform: Our AWS infrastructure is fully managed with Terraform. This allows us to keep a simple history of all changes and minimise the manual effort. 

Databases & Hosting
Databases & Hosting

DynamoDB: DynamoDB is often used to access large amounts of data in real time. We regularly use it with AWS Lambda to provide a scalable solution. 

PostgreSQL/MySQL: If flexibility of data access is paramount, then we also use relational databases 

AWS:  For us, it's "cloud first" so that we are able to scale the infrastructure of our products. Here we rely on services such as AWS Lambda, S3 and DynamoDB 

Employee reviews

Dariia Spychak
Dariia Spychak
Backend Developer

Right now we are working on a new major project for user management and permissions, which is interesting but also complex and has many aspects that will allow it to be integrated into other components. I really like the fact that, as developers within the team, we can decide which technology and programming language we want to use and how we structure the processes. This can sometimes be a challenge, but it helps us gain a lot of new experience. I can work on anything I want to learn about on self-learning days. And of course we have a very friendly and open working atmosphere. Team building events and mob/pair programming sessions also contribute to this. 

Jan Beilfuß
Jan Beilfuß
Frontend Developer

I am currently working in the Review Insights team. In this product team, we work on frontends that help our customers, i.e. online retailers, to draw valuable information from the collected reviews. I have another colleague in the team from the front-end team with whom I work closely. This starts with the planning and discussion of solutions and ends with the joint revision of the written code. Overall, the working atmosphere at Trusted Shops is very pleasant and relaxed. Thanks to a specially developed platform solution, each product team can build its own micro frontends and is thus independent of the other product teams. This means that you are not restricted in your choice of framework, for example - however, we mainly use the common JavaScript frameworks. Personal development is also encouraged. This year, for example, I was able to take part in a one-week summer school on the topic of deep learning, and we basically have one day a month at our disposal to continue our education as we see fit.

Jonas Reinecke
Jonas Reinecke
DevOps Engineer

As a DevOps Engineer, I work closely with the developers and support them in their daily work. I take care of building the infrastructure of our applications and configuring the deployment pipelines. I also support the developers of a product team and plan their architecture for new applications that are developed in the team. Besides the work in the product teams, all DevOps colleagues meet once a month for a common exchange. In this meeting we discuss new technologies and present projects we have worked on in the product teams. We also meet regularly for various sessions in which we try out different new technologies directly. It is exactly this combination of my work in the product team and the exchange with my DevOps colleagues that I like very much and brings a nice change in the daily work. In addition to the many technical meetings, there are also regular coffee meetings, in which I make up for the otherwise regular meetings at the coffee machine with my colleagues virtually.

Have we awakened your interest?

Apply now