Job
In this role, you will be responsible for onboarding new clients by conducting technical analyses, developing ETL processes, and ensuring communication with customers to guarantee smooth integrations.
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Your role in the team
- As a Software Engineer in our Implementation & Customer Team, you are the bridge between our product and our customers. You ensure that new customers start successfully, technically sound, reliable, and without friction.
- This is not a traditional support role. It is an engineering position with a strong customer focus, with the difference that you handle the entire process from problem to solution independently: from diagnosis through implementation to handover. What you see during this process directly influences the product.
- Customer onboarding & technical integration: You support new clients from the initial technical analysis to operational deployment. This means understanding systems, clarifying requirements, and ensuring a smooth start on Fynn together with the customer.
- Technical analysis of existing systems and data structures on the client side
- Coordination with clients regarding requirements, schedule, and handover criteria
- Setting up and verifying the integration, API connections, configuration, test runs
- A large part of our clients switch from existing systems to Fynn. You develop and operate the ETL processes that enable this transition – in a structured, validated, and secure manner.
- Analysis and mapping of source data from legacy systems, CSV exports, or third-party APIs
- Development of ETL pipelines with robust error handling, validation logic, and logging
- Quality assurance of migrated data, especially in the finance context, is not an optional step.
- When customers encounter issues, you are the first technical point of contact. You replicate, analyze, and resolve, or escalate with full context. Additionally, you actively contribute to product development.
- Error analysis and bug fixing in our PHP/Symfony backend and the TypeScript layer
- Direct communication with clients regarding error status and resolution
- Actively incorporate feedback from customer contact into the product as a concrete improvement suggestion.
- Support in integrating new features into the existing platform to enhance customer flexibility
- Conducting code reviews and ensuring adherence to best practices in software development
- Creation and maintenance of user documentation for our software modules
Our expectations of you
Qualifications
- Knowledge in Subscription Billing, Invoicing, or Fintech
- Excellent knowledge of object-oriented development.
- TypeScript / JavaScript: you can read our API and frontend layer and identify errors within it
- Solid SQL understanding: You address data issues directly at the source
- Precision: In the finance environment, every number matters, and you are aware of your responsibility.
- Communication: you can explain the same problem to an accountant and a backend developer in two different ways
- Fluent German is a must for our German-speaking client base.
Experience
- 2-4 years of experience in software development, preferably in a customer-facing environment, as an Implementation Engineer, Solutions Engineer, or Software Developer with client contact
- Good PHP skills, ideally with Symfony experience, you are comfortable working with an existing backend
- Experience with data migrations or ETL processes, or a clear idea of how you would approach it
What we offer
- With us, you're not working alone. Code reviews, joint error analyses, open questions within the team – this is part of our daily routine, not an exception.
- We emphasize that critical code receives a second pair of eyes, that decisions are documented transparently, and that knowledge is not dependent on individual persons but remains available within the team.
- In addition, we consistently work with AI tools such as Claude Code, Codex, or others, not to skip steps, but to focus on what really matters: understanding the problem, the quality of the solution, and customer feedback. Experience with these tools is not a hiring criterion. The willingness to work this way is.
Benefits
Work-Life-Integration
Topics you will work on
Job locations
About your employer
Fynn GmbH, based in Cologne, Germany, provides an advanced software-as-a-service platform that assists companies with automated billing and management of subscription models. This solution offers flexible pricing options and covers the entire process from proposal creation to payment processing. Fynn primarily targets B2B customers in the German market.
- Startup
- Onsite, Hybrid
- Internet, IT, Telecommunication
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