Backend Engineer with Nodejs Python

Job Title : Senior Node.js Developer

Experience : 5 to 10 Years

Location : Gurugram (5 days WFO) | Initial 15 days in Udaipur (expenses covered)

Notice Period : 1 Month or less

Role Overview :

We are hiring a Senior Node.js Developer to lead and deliver scalable solutions, drive best practices, and mentor engineers. Strong Node.js expertise is mandatory (MERN experience welcome with Node.js depth).

Mandatory Skills :

Node.js, Express.js, Data Structures & Algorithms, System Design (HLD/LLD), CI/CD, Git, Agile, Async programming, Debugging & Performance Optimization.

Key Responsibilities :

• Lead development and ensure high‑quality delivery.
• Gather requirements, design (HLD/LLD), and implement solutions.
• Optimize performance, scalability, and integrations.
• Mentor team members and support hiring.
• Collaborate in Agile teams and enforce coding best practices.

Required Skills :

• 5 to 10 Years in backend with Node.js/Express.js.
• Strong in DSA, problem‑solving, and system design.
• Experience with CI/CD, Git, and Agile methodologies.
• Expertise in async programming, debugging, and performance tuning.
• Excellent communication and collaboration skills.

Nice to Have : MERN stack exposure, cloud (AWS/Azure/GCP), Docker, caching/queues.

Interview Process :

1. AI Technical Interview
2. System Design Round (HLD & LLD)
3. Data Structures & Algorithms
4. HR Interview

Location :

• Primary : Gurugram (Digital Greens, Sector 61)
• Initial 15 days : Udaipur (A‑square, Shobhagpura)

Note : Preference for Gurugram/NCR candidates. Stable profiles only.

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

Position: Lead Backend Engineer

Location: Remote

Experience: 10+ Years

Budget: 1.7 LPM

Employment Type: [Contract]

Required Skills & Qualifications:

• 10+ years of proven backend engineering experience.
• Strong proficiency in Python.
• Expertise in SQL (Postgres) and database optimization.
• Hands-on experience with OpenAI APIs.
• Strong command of FastAPI and microservices architecture.
• Solid knowledge of debugging, troubleshooting, and performance tuning.

Nice to Have:

• Experience with Agentic Systems or ability to quickly adopt them.
• Exposure to modern CI/CD pipelines, containerization (Docker/Kubernetes), and cloud platforms (AWS, Azure, or GCP).

Are you passionate about backend development and building scalable applications? Join our growing team!

Technical Skills:

• Extensive experience in programming/scripting languages and frameworks in at least two Node.js, Java Springboot, and Python.
• Understanding of architectural patterns like Flux and MVC is a desirable
• Work experience in REST API service, Socket connections, and mechanisms to handle real-time async data is important.
• Strong knowledge in OOPS, GIT, SQL/nonSQL DB (such as Elastic DB, Mongo DB, MySQL), Design Patterns
• Preferred to have experience with microservices, API gateway, AAA service
• Good knowledge of coding standards, design patterns, unit testing frameworks, TDD, CI/CD practices.

Must have previous experience in leading a team-

• Experience with RESTful web services, CSS, and HTML5 is desirable-
• Experience with designing and building APIs with REST/Microservices
• Good to know about AWS Lambda & supporting configuration knowledge. Knowledge of any of the serverless frameworks like Serverless, AWS SAM would be an advantage.-
• Good to know of API Gateway and CloudFront.-

👉 Required Skills:

• Strong experience with Node.js
• Hands-on expertise in Payment Gateway Integration
• Proficient in MySQL Database Management
• Knowledge of Socket Programming is a big plus!

● 5+ years of experience as a Data engineer or related role.

● 5+ years of experience in application development using Python

● Strong experience with SQL and good to have NoSQL.

● Experience with Agile engineering practices.

● Preferred experience in writing queries for RDBMS, cloud-based data warehousing solutions like

Snowflake.

● Ability to work independently or as part of a team.

● Experience with cloud platforms, preferably AWS, is good to have

● Experience with ETL/LT tools and methodologies.

● Experience working on real-time Data Streaming and Data Streaming platforms

We are looking for a Java Developer with experience in building high-performing, scalable, enterprise-grade applications.

You will be part of a talented software team that works on mission-critical applications. Java developer roles and responsibilities include managing Java/Java EE application development while providing expertise in the full software development lifecycle, from concept and design to testing.

Java developer responsibilities include designing, developing and delivering high-volume, low-latency applications for mission-critical systems.

• Contribute in all phases of the development lifecycle
• Write well designed, testable, efficient code
• Ensure designs are in compliance with specifications
• Prepare and produce releases of software components
• Support continuous improvement by investigating alternatives and technologies and presenting these for architectural review

• BS/MS degree in Computer Science, Engineering or a related subject
• Proven hands-on Software Development experience (Microservices & Springboot)
• Proven working experience in Java development
• Hands on experience in designing and developing applications using Java EE platforms
• Object Oriented analysis and design using common design patterns.
• Excellent knowledge of Relational Databases, SQL and ORM technologies (JPA2, Hibernate)
• Experience in the Spring Framework
• Experience in developing web applications using at least one popular web framework (Spring MVC)
• Experience with test-driven development

Key Responsibilities & Requirements

You should primarily be a backend developer or full stack developer, very good at code reviews and code optimization. Our products depend on processing large amounts of data and having fast response times is absolutely essential.

You will have the opportunity to

• Take responsibility of building systems for scale
• Manage our backend systems and database optimizations
• Assist in key decisions and design architecture that drives development across products
• Define processes and help with efficient functioning of the team
• Work with cross-functional teams to ensure the products are scalable, maintainable and secure

What we expect from you:

• We work on Ruby on Rails but you can have 2+ years of experience as backend developer in any language
• Have a solid grasp of OOP, databases and automated testing methodologies.
• Know how to manage sprint and ensure tasks are completed within the timeline
• Design and implementation of low-latency, high-availability, and performant applications
• Strong understanding of SQL databases
• Proficient knowledge of various authentication methods like JWT, OAuth etc..
• Perform peer code reviews and Code audit - Analyze existing code and remediate performance issues within existing applications

Having seen over 10x growth in 2021 alone, we are expanding our scope of products to cater to the fast growing creator economy and help creators monetize in ways beyond influencer marketing. We are also looking at tremendous growth in the next few years, standing at the verge of building something huge!

Come join our team of developers if a fast learning environment in a high growth industry excites you.

About Winkl

Please check out our product before applying to this position -
* Website - https://winkl.co
* Team - https://winkl.co/about
* Android App - https://play.google.com/store/apps/details?id=co.winkl.app&;amp;hl=en
* iOS App - https://www.winkl.co/app

Winkl is a technology company that is changing how influencer marketing is done. From a manual process earlier to an automated and data-driven process with Winkl. More on this here.

Leveraging data & technology helps Winkl scale influencer marketing to a level that wasn't possible earlier. This has helped Winkl power influencer campaigns for top brands in India like Flipkart, Amazon etc.

Culture & Expectations

* At Winkl, no one tells you what to do. We don't micromanage. We don't spoon feed. As long as you're willing to learn new things, are proactive, initiate activities on your own, make mistakes and learn from them, take responsibility, stick to your word of getting things done, we think you'd be a great fit at Winkl.
* On a day to day basis, you'll get to be an important part of a high growth startup as it scales.
* You'll receive all possible support from your team at Winkl to help you succeed. 
* Being highly accountable is a non-negotiable requirement