Backend Engineer

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

About VisibilityStack

VisibilityStack helps businesses connect with people who are actively searching for the solutions they offer, both on Google Search and in the new wave of AI-powered search tools.

Our AI agents identify what your audience is looking for, create content that answers those questions, and structure it so Google and AI systems can easily understand and recommend it. We also strengthen your online credibility through strategic backlinks and a strong social presence.

Everything is guided by real-time data. We focus on what works, remove what does not, and keep your content working around the clock. The result is simple: the right people can find you, trust you, and reach out when they need what you offer.

The Role

We need a Senior Engineer who ships production code that scales. You'll be the technical anchor—building critical infrastructure, solving complex problems, and mentoring junior developers through code reviews and pair programming.

You'll shape our future in four key ways: writing the code that becomes our foundation, being a key voice in engineering hiring decisions, helping establish the processes and patterns everyone follows, and having significant input on product decisions—your technical perspective directly influences what we build, not just how we build it. This isn't about managing people or writing performance reviews—it's about technical leadership through excellence.

What's in it for you:

1. Own mission-critical systems end-to-end — Your code directly generates customer revenue
2. Skip the politics, ship products — No layers of approval, no enterprise bureaucracy
3. Shape product direction — Your technical insights influence product strategy, not just implementation
4. Learn cutting-edge AI in production — Work with LLMs, vector databases, and agent orchestration at scale
5. Shape technical decisions and processes — Your input matters on how we build, not just what
6. Accelerated growth path — As we scale, you choose: become our technical lead or remain a deeply influential IC
7. Direct founder access — Collaborate on product vision, not just execute specs

Location: Janakpuri, Delhi (Hybrid - Maker's Schedule)

Our Work Philosophy:

We follow the Maker's Schedule, not the Manager's Schedule. This means uninterrupted blocks of deep work when you're building, and high-bandwidth collaboration when we're solving problems together.

In Practice:

1. In-office days: Whiteboard architecture sessions, rapid product iterations, deep dives into product strategy, complex debugging that needs three minds on one problem
2. Deep work days: Uninterrupted coding from wherever you work best—home, office, or that coffee shop with perfect noise levels
3. Balance by design: We optimize for both intense collaboration and deep focus

The best technical breakthroughs happen in two modes: intense in-person collaboration where ideas bounce rapidly, and deep solo work where complex problems get solved. We protect both.

Responsibilities

Technical Excellence

1. Build production systems that handle millions of AI operations daily
2. Write complex integrations that others can't figure out
3. Solve scaling problems before they become emergencies
4. Implement robust error handling and monitoring
5. Own critical infrastructure components end-to-end

Architecture & Code Quality

1. Design APIs that won't need v2 in 6 months
2. Make pragmatic technical decisions (boring tech when appropriate)
3. Help establish engineering processes—from code review to deployment
4. Create patterns and standards other engineers can follow
5. Lead code reviews that teach, not just critique
6. Balance shipping speed with technical sustainability

Hiring & Technical Assessment

1. Conduct technical interviews for engineering roles
2. Design practical coding assessments that test real skills
3. Provide strong input on hire/no-hire decisions
4. Partner with founders on technical requirements for roles
5. Help close strong candidates by selling the technical vision

Mentorship & Collaboration

1. Pair with junior developers on complex problems
2. Share knowledge through code reviews and documentation
3. Unblock teammates when they're stuck
4. Work directly with founders on technical strategy
5. Partner with product team on feature design and technical feasibility
6. Turn product ideas into technical specifications
7. Work directly with founders on technical strategy
8. Turn product ideas into technical specifications

Requirements

Must Have

1. 5-7 years of software engineering experience
2. Expert-level Python development skills
3. Production experience with LLMs (OpenAI, Anthropic, not just prototypes)
4. Built systems that scaled (and dealt with the failures)
5. Strong debugging skills—you fix what others can't
6. API design that makes sense to other developers
7. Git workflows and collaborative development

Strong Advantages

1. Previous early-stage startup experience
2. Production experience with vector databases (Pinecone, Weaviate, pgvector)
3. Elasticsearch or search infrastructure expertise
4. Built revenue-generating AI/ML systems
5. Experience with high-volume data pipelines
6. Contributed to open source projects
7. Informal mentorship or tech lead experience

Tech Stack

1. Backend: Python, FastAPI, PostgreSQL
2. AI/ML: OpenAI APIs, LangChain, Vector DBs
3. Infrastructure: AWS, Docker, GitHub Actions
4. Search: Elasticsearch (evaluating alternatives)

What We Offer

1. Early employee equity and financial upside
2. No bureaucracy—your code ships to production
3. Work on genuinely hard technical problems
4. Learn from and contribute to cutting-edge AI systems
5. Clear growth path as the team scales

We are looking Python intern/developer role. We are looking for candidates who are strong in core Python skills, able to work independently, and strong in developing logic.

• Conducting analysis of website and application requirements.
• Writing back-end code and building efficient PHP modules.
• Developing back-end portals with an optimized database.
• Troubleshooting application and code issues.
• Integrating data storage solutions.
• Responding to integration requests from front-end developers.
• Finalizing back-end features and testing web applications.
• Updating and altering application features to enhance performance.

• Bachelor’s degree in computer science or a similar field.
• Knowledge of PHP web frameworks including Yii, Laravel, and CodeIgniter.
• Knowledge of front-end technologies including CSS3, JavaScript, and HTML5.
• Understanding of object-oriented PHP programming.
• Previous experience creating scalable applications.
• Proficient with code versioning tools including Git, Mercurial, CVS, and SVN.
• Ability to project manage.
• Good problem-solving skills.

Java Developer Job Description

We are looking for a Java developer responsible for building Java applications.

Responsibilities

• Design, build and maintain efficient, reusable, and reliable Java code
• Identify bottlenecks and bugs, and devise solutions to these problems
• Help maintain code quality, organization, and automatization.

Skill Set:

• Proficient in Java, with a good knowledge of its ecosystems
• Java, Rest API integration, JSON, XML, Oracle, Microservices, Agile Scrum.
• Experience in developing large-scale distributed systems.
• API knowledge
• Solid understanding of object-oriented programming
• Familiar with various design and architectural patterns
• Skill for writing reusable Java libraries
• Spring, Spring Boot, Spring Cloud, React native
• Experience: 04 to 10 years
• Salary: As Per Market

What you will be doing

You will join our team as our Senior PHP Developer (Laravel) and your main responsibilities will be to:

• Write clean and maintainable code with good test coverage.
• Implement new features in collaboration with our design team.
• Optimize existing code to perfection with special attention to performance and maintainability.
• Do a code review of your colleagues work.

You and our future-proof stack

• We seek a balance between sticking with what works and fearlessly exploring the new.
• We use the latest stable version of PHP 7|8 because it allows us to write better code using features like strict type declarations, typed class properties and arrow functions.
• We leverage the elegance, simplicity and readability of the latest Laravel version.
• We want to spend our precious time on things that matter the most; that's why we perfect our easy to run the development environment with Homestead and custom scripts.
• We write and run tests with PHPUnit and http://cypress.io/">JavaScript End to End Testing Framework.
• We have a great set of tools to maintain the code quality and run on CI/CD (psalm (error level 4), rector, phpcs, php-cs-fixer, phpcpd etc.)
• We use Rector to maintain our code quality.
• We’re constantly refactoring our front-end code intending to reach front-end heaven:
• Laravel Blade template engine.
• PostCSS to maximize the power of modern CSS.
• Webpack for perfect control over front-end assets.
• Latest JS with support for ES2020 features. To accomplish this we use the latest Babel releases.

We ❤ CI (Continuous Integration) and CD (Continuous Delivery) so we usually deploy a few releases per day: Zero downtime. Just a few buttons to push. No sweaty palms.

We care deeply about the Developer Experience (DX) of our codebase and tools. DX and DevOps is our middle name: Git, GitHub, HTTP/2, Assets CDN, AWS, Enterprise SSDs on our high-spec servers, and much more.

About you

• You have expert knowledge of PHP.
• You have expert knowledge of Laravel.
• You have experience with test-driven development (TDD).
• You have 6+ years of experience working professionally with OOP.
• Your work is based on a solid foundation in computer science fundamentals from data structures and algorithms to design patterns.
• You are an engineer by mindset and always try to understand how things work under the hood.
• You have substantial experience working with RESTful web services and ORM concepts.
• You love to learn through doing. You’re ready to put in some hard work to expand your skills.
• You speak and write acceptable English – not perfect English, just acceptable
• You are a team player and you don't bring your ego to work. 
• You are self-motivated and self-disciplined and thus work well in a flat hierarchy with lots of freedom.
• You love to have creative freedom, make independent judgments and live up to the responsibility that comes with that freedom.
• You love to create tangible results—every hour and every day.
• You love to make a positive impact on the world and the lives of others.

Company Profile

Prescinto is a VC funded SaaS company in the renewable energy space enabling digital transformation for customers across the globe.

Prescinto provides solutions to improve power generation for Renewable energy power plants by identifying areas of underperformance and lost generation opportunities through patent pending methodologies; systematically addressing these through an automated workflow system to improve power generation for our customers.

 This is achieved by leveraging the IoT and Analytics platform built to collect high frequency data from distributed renewable energy assets and the comprehensive data lake.

 Roles & Responsibilities

 You are responsible for understanding the product architecture and Design laid out by the Architect and Develop product features in alignment with the architecture.

Product is built on Microsoft stack with Angular 11, .NET and data residing in MS SQL Server and InfluxDB, mobile application built on Flutter and data lake deployed on Azure environment. It extensively uses multi-threading for parallel processing, stored procedures for data access and leverages time-series database for storing high frequency equipment data.

In this role, you should be able to work independently as well as work with vendor and junior members to collaboratively build the features and take them to production. You need to be both a big picture thinker and in-depth problem solver, your knowledge and skills are both broad and deep.

Do you take pride in building customer centric functionalities with an eye on performance? Are you remembered for the quality of your code? This position is for you.

Desired Skills & Experience

• 8+ years of Product development experience of which at least 2 years should comprise of working independently with minimal supervision and guidance
• Experience with at least one full cycle development of product features from requirements to Production deployment to Post production support is critical
• Excellent Programming Skills using C#, WPF, MVVM, Winforms, .NET Framework, Windows Communication Foundation (WCF), ASP.net web api, SQL Server, Store Procedure, Triggers
• Solid Understanding of Multi-Threading and Parallel Programming
• Excellent understanding of Windows Operating System Internals (Process, Threads, Memory Management).
• Clear understanding of OOP and OOAD
• Excellent application debugging skills using Visual Studio Debugger
• Strong knowledge in design patterns, data structures and algorithms
• Experienced in developing Windows desktop applications
• Ability to work independently and be self-driven
• Should have knowledge on code repositories like SVN, GitHub etc and Agile tools like JIRA
• Should have excellent communication skills, excellent analytical and problem-solving skills
• Have working experience in Test-driven Development and Test Automation experience in third party control like DevExpress, Telerik WPF controls
• Experience building a SaaS product preferable
• Startup experience preferable

• Design and develop cloud native enterprise applications 
• Define and establish conventions, standards and best practices for the SDLC process and ensure that quality control is of paramount importance at each step of the development life cycle
• Develop reusable frameworks and libraries that can drastically accelerate new application development in the future
• Participate in the requirement analysis and gathering process and also perform sit-withs with business teams to ensure there is full clarity of the problem statement
• Actively engage wih infrastructure team and take ownership of DevOps processes to ensure that build and deployment processes are efficient and optimal.
• Actively engage with project stakeholders to ensure all are in sync with the progress, risks and issues
• Quickly learn and adopt cutting edge technologies to help keep the org ahead of the curve