Senior Python Backend 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

Job Title: Associate Backend Engineer

Job Summary:

We are looking for an enthusiastic and motivated Associate Backend Engineer with 1 to 2 years of experience to join our growing engineering team. Whether you're a recent graduate or have some industry experience, this role offers a strong foundation to grow your skills in real-world backend development. You’ll work closely with experienced engineers and contribute to the design, development, and maintenance of scalable backend systems that power our products.

This position is ideal for individuals who are eager to learn, write production-grade code, and grow into a high-performing backend engineer.

Website: https://www.thealteroffice.com/about

Key Responsibilities:

• Assist in building and maintaining backend services and APIs for web and mobile applications.
• Work with both relational (MySQL, PostgreSQL) and NoSQL (MongoDB, Redis) databases for data modeling and storage.
• Write clean, maintainable, and well-documented code under guidance.
• Contribute to authentication, authorization, and other core backend features.
• Collaborate with cross-functional teams including product, frontend, and QA to deliver complete features.
• Participate in code reviews and incorporate feedback to improve code quality.
• Debug issues, write unit/integration tests, and help maintain service reliability and performance.
• Learn to work with CI/CD pipelines, version control (Git), and deployment workflows.
• Use tools like Docker, basic cloud services (AWS/GCP/Azure), and optionally explore monitoring/logging tools.
• Explore new technologies such as GraphQL, WebSockets, or message queues (e.g., Kafka, RabbitMQ) when relevant.

Requirements:

• 1 to 2 years of backend development experience, including internships, academic projects, freelance, or open-source work.
• Familiarity with at least one backend programming language (e.g., Python, Java, Go, JavaScript, etc.).
• Basic understanding of RESTful APIs, HTTP, databases, and server-side logic.
• Exposure to SQL and NoSQL databases and understanding of CRUD operations.
• Familiarity with Git and fundamental development workflows.
• Willingness to learn and apply best practices in scalability, security, and asynchronous programming.
• Strong problem-solving mindset and eagerness to take feedback and grow.
• Good communication and collaboration skills in a team environment.

**Candidates from Dehradun or nearby locations are preferred**

Notice period: Immediate to 30 days

About the Job:-

The ideal candidate will be familiar with the full software design life cycle. They should have experience in designing, coding, testing and consistently managing applications They should be comfortable coding in a number of languages and have the ability to test code in order to maintain high-quality code.

➜ Responsibilities:-

1. Design, code, test and manage various applications

2. Collaborate with the engineering team and product team to establish the best products

3. Follow outlined standards of quality related to code and systems

4. Develop automated tests and conduct performance tuning

➜ Requirement:-

• Proficient ASP.NET/.NET CORE, Web API, MVC, Entity framework and MS SQL/MySQL is mandatory.

• Experience with HTML5/CSS3, JavaScript/jQuery, Angular; web-service: SOAP, RESFUL, MVC API

• Willing to learn new technologies

• Have good knowledge or experience with Agile/SCRUM development method

• Detail oriented, self-motivated and disciplined, with the ability to complete assigned tasks with minimal oversight in a professional and timely manner is a must

Overview of the role

As a Node Developer you will be collaborate with cross-functional teams to define, design and build performant modern web applications and services. Build high-quality web applications and services by writing clean and modular code.

Must have skills

• Overall 3-5 Years of experience in writing unit and integration tests to ensure the robustness and reliability of web applications and services.
• Measure and improve the performance of microservices. Catalyse growth within the team through code reviews and pair programming to maintain high development standards
• Investigate operational issues to find the root cause and propose improvements Design, build, and maintain APIs, services, and systems across Stripe’s engineering teams.
• Expert level of experience in the design and development of Web Applications, and highly scalable distributed systems.
• Should have experience in development skills using the latest technologies including NodeJS(fastify framework), Microservices, PostgreSQL, Redis, etc. Should have exposure to NoSQL and SQL development.
• Comprehensive knowledge of physical and logical data modeling, and performance tuning.
• Should possess excellent communication, presentation, and interpersonal skills.
• Ability to work collaboratively and productively with globally dispersed teams.
• Build high-performance teams and Coach teams for successful career growth.
• Experience working with relational and non-relational databases, query optimization, and designing schema

Desired Background

Bachelors/Masters Degree in Computer Science, Information Technology

Key Responsibilities

• Back-end Implementation: Authorization, Authentication, Modular design
• Application Development: Documentation, code quality, Unit Testing, Optimization, Bug fixing.)
• Back-end Operations (build tools, deployment, speed: (app, tests, builds, deploys), monitoring errors/logs, and stability).
• Review the created data model & ask any necessary clarifying questions before starting on work
• Write API code to implement the action on visual elements.
• Develop Json Web Services and Web applications.
• Create prototypes and staging sites for review and feedback
• Optimize websites and applications to ensure fast loading speeds
• Maintain websites and implement any necessary additions or enhancements
• Identify and troubleshoot various website issues and coding problems
• Collaborate with members of the website team, including designers and front-end developers, to consistently improve functionality and user-friendliness of web applications
• Maintain updated knowledge of the development industry and any advancements in technology
• Meet tight deadlines as required
• Knowledge of the common application/web security and OWASP vulnerabilities.
• Knowledge of the encryption algorithms to protect sensitive information.
• Knowledge of PII, PCI, HIPPA, and GDPR compliance and how to implement.
• Understanding of security breaches of data-in-transit and data-at-rest and knowledge in implementation for both.
• Knowledge/Aware of finding the vulnerabilities of the third-party components/libraries used in the application and remediating vulnerabilities.

 

 

Technical Skills: Java,Spring boot, Rest API, Json, JPA and/or Hibernate, SQL, AWS

Database : MySQL, PostgreSQL, SQL Server, MongoDB

Other : Tomcat, Eclipse, Oauth, JWT, Git.

• 1+ year of experience
• Full responsibility for designing and building core back-end modules and system architectures.
• Good understanding of database concepts.
• Experience with at least two programming languages (PHP & GoLang).
• Experience in creating at least one web application.
• Knowledge of MySQL in-depth and basic understanding of MongoDB along with basic understanding about different paradigms of programming.
• Ability to interact and coordinate with a team.
• Should have a basic understanding of APIs.
• Modify code in time to keep code dry and reusable.
• Should have worked in at least one framework in the backend.
• A background in Software Architecture would be preferred.

• Develop data-driven web solutions on PHP frameworks (ideally CakePHP), but be undeterred when the need arises to create an application from the ground up as required, maintain, contribute and adhere to our programming best practices and guidelines.
• Work with a team of UI designers, programmers, and server admins, to bring brand new concepts to the market.
• Help improve our code quality through writing unit tests, automation and performing code reviews.
• Immediate Joiner