Drupal Developer

About ZYSYGY

ZYSYGY is building Germany's zero-fee payment network. Merchants pay zero transaction fees. We route payments directly over SEPA Instant, bypassing Visa, Mastercard, and the entire card network chain. No hardware. No card reader. Just a phone.

We are building the first company to combine a fully software-based merchant POS with a consumer super-app for everyday financial life: payments, transport, utilities, government services, all in one place. Think what UPI did for India. We are doing it for Germany, from the ground up, on banking rails.

Role Overview

You will join the core engineering team as a founding engineer. You will own the backend payment engine end to end: transaction flows, wallet management, SEPA Instant settlement, KYB/KYC integration, recurring mandates, refund logic, and the compliance export layer (DATEV, Kassenbuch, GoBD, fiskaltrust). On mobile, you will contribute to the React Native consumer and merchant apps alongside our mobile engineer.

You will own what you build from development through deployment, monitoring, and production reliability. The architecture decisions you make in the first six months will run in production for years.

What you will do

Design and build the backend payment engine: transaction flows, wallet management, SEPA Instant settlement, offline payment authorization, and recurring mandate billing.

Own KYB/KYC integration and the compliance export layer: DATEV, Kassenbuch, GoBD, and fiskaltrust for KassenSichV.

Build REST APIs for financial-grade reliability and high-throughput transaction processing, including full R-transaction handling and reconciliation pipelines.

Contribute to the React Native consumer and merchant mobile apps alongside our mobile engineer.

Own the full lifecycle of what you build, from development through deployment, monitoring, and continuous improvement.

Integrate AI tooling into your development workflow as a matter of course: code generation, automated testing, and intelligent review.

Who you are

Meaningful hands-on experience building payment systems, fintech infrastructure, or financial APIs.

You have designed a ledger. You understand double-entry bookkeeping, immutable transaction records, and why you never update a financial row.

You have solved the partial failure. Money left one wallet and did not arrive in the other. You know how to detect it, resolve it, and make sure it does not happen again.

You understand idempotency at a design level. You have built systems that survive client retries, duplicate webhooks, and network drops without double-charging anyone.

You have built or reasoned about reconciliation: detecting discrepancies between your internal ledger and an external settlement file, and resolving them reliably at scale.

You understand KYC and KYB state machines, what happens when verification status changes mid-transaction, and what a regulator expects from your audit trail.

You are comfortable with SQL databases and own the full lifecycle of your code from development through deployment.

You can communicate technical decisions clearly to non-technical stakeholders. At this stage of the company, that matters.

You are a continuous learner. Payments infrastructure is a deep domain and you treat it that way.

You are comfortable with ambiguity and early-stage risk. There is no playbook yet. You will help write it.

Strong academic background preferred. Demonstrated engineering ability matters more than institution.

Relocation

Relocation to Munich, Germany, is on the table for the right candidate, including visa support.

Connect with the Founder

You can also connect with me on LinkedIn at www.linkedin.com/in/shabbir-maimoon

·    What you’ll be doing:

  Architecting and delivering mid to large scale Enterprise Applications on Microsoft Platform.

·      Recommending and participating in activities related to the design, development and maintenance of the Enterprise Application Architecture.

Delivering projects on time with quality.

·      Provide technical leadership regarding technology or project to customers and team members

·      Shares best practices, lessons learned and constantly updates the technical system architecture requirements based on changing technologies and knowledge related to recent, current and up-coming vendor products and solutions.

·      Participate in technical forums and discussion within the team and with clients.

·      Guides and mentors’ team in terms of technical solutioning.

What you’ll bring to the team:

·      You have 15+ years of experience in Strong design & coding experience in Dot net framework using design patterns & OOPs concepts.

·      You have practical knowledge & good understanding of cross technology and functional domains, programming concepts and logical approach for problem solving.

You hold rich experience on web development technologies including ASP.NET, MVC5, JavaScript, jQuery, HTML5, AJAX, XML and CSS.

·      You have experience in web application Architecture and Development with hands on expertise in delivering solutions, customizing C#, ASP.Net applications using development tools like Visual Studio 2010/2012.

At LambdaTest, We help developers and testers fix their applications across a combination of2000+ browsers and Operating Systems by providing a complete cross-browser ecosystem on the cloud. We are looking for an industry leading Full Stack Developer with strong PHP experience to join our Technology department. You’ll be someone who loves innovating, problem solving and wants to be at the forefront of transformation. We are constantly developing new and cutting edge scalable solutions and we need a best in class developer to push boundaries, work at pace and never take no for an answer! 

At LambdaTest' You’ll be playing a key role within our team as we build solutions and concepts to further our ongoing global expansion. As a Full Stack Developer, you should be comfortable around both front-end and back-end languages, development frameworks and third-party libraries. .

• This is an exciting opportunity to join an evolving team both in technology and process and this role will be an important part of shaping our innovation and in implementing these changes. 
• Practical experience of continuous integration and deployment 
• Multiple concurrent feature branches and experience of merging them 
• Software architecture considerations (outside of simple request/response patterns) 
• Design patterns 

• 2+ years of experience developing with modern PHP using Laravel or Symfony
• Strong Javascript framework experience on a production environment (React, Angular, Vue,)
• 2+ years experience with VueJS
• Experience building, maintaining, testing and documenting APIs to be used by other developers both internally and externally
• Experience with database management and optimization
• Experience with other data stores like Elastic Search, MongoDB or similar
• Experience with git and related tools
• University Bachelor's degree or equivalent experience

Must have,

- Fundamental of Python(Data types in python, scope of variable, asynchronous programming)
- Should be able to code in Python

- Basic Understanding of Database

- API designing

- Problem Solving skills

- Fundamentals of storage, caching

Good to have,

- AWS Knowledge,

- Python Framework(Django, Flask)

- Knowledge on Message Broker, Caching

- SQL and no-SQL database

• Excellent in Jquery, HTML5, CSS, ReactJS or AngularJS.

• Excellent programming skills in PHP Codeigniter / Laravel Framework. (Laravel is mendatory)

• Experience with popular React.js workflows (such as Flux or Redux)
• Familiarity with newer specifications of EcmaScript
• Experience with data structure libraries
• Familiarity with RESTful APIs
• Must be well versed with software application design and development tools.
• Knowledge of modern authorization mechanisms, such as JSON Web Token
• Familiarity with the whole web stack, including protocols and web server optimization techniques.
• Ability to understand business requirements and translate them into technical requirements
• Familiarity with code versioning tools (such as Git, SVN, and Mercurial)
• Excellent written and verbal communication skills.