Senior Backend Developer

About Kaizen

Kaizen Loyalty is a fast-growing B2B SaaS company building loyalty and engagement platforms that drive measurable user behavior and business growth.

Operating across Istanbul and London, we work with leading brands such as Anadolu Efes, Ferrero, Nestlé, and Coca-Cola, reaching over 20 million users through our platforms.

What This Role Is

A deeply technical backend engineering role, scalable APIs, event-driven systems, multi-tenant architecture, cloud-native infrastructure.

But it's more than writing great backend code. AI tools are already in use across our team. Your job is to take that further: build the workflows, set the standards, and mentor engineers so that AI-augmented development becomes the norm not the exception.

We're not looking for someone who uses AI well alone. We're looking for someone who makes the whole team better at it.

What You'll Work On

Designing and building scalable .NET backend services powering loyalty, rewards, and gamification flows
Evolving our multi-tenant SaaS architecture for performance and maintainability
Integrating AI-assisted tooling into development workflows; code generation, refactoring, testing, documentation
Working with event systems (RabbitMQ / Azure Service Bus) and distributed architectures

Hard Requirements

What We're Looking For

5-8 years of backend engineering experience in production environments
Strong hands-on expertise in .NET / C#
Active daily use of AI development tools (GitHub Copilot, ChatGPT, Cursor, or similar)
Awareness of AI limitations and hallucinations, you know when to trust the output and when to validate it
Proven experience with scalable API design and distributed systems
Solid understanding of SQL (SQL Server preferred), caching (Redis), and ORM tools (EF Core)
Cloud experience: Azure or AWS (hands-on, not just familiarity)
CI/CD and DevOps comfort — you've deployed, monitored, debugged in production

Strong Plus

Experience with multi-tenant SaaS architecture
LLM API integration (OpenAI, Azure OpenAI)
Kubernetes / containerized environments
Messaging systems: Kafka, RabbitMQ, Azure Service Bus
Experience in loyalty, marketing automation, or engagement platforms

What We Offer

Opportunity to shape a growing global SaaS platform
Direct impact on products used by millions of users
A product-driven engineering culture
Close collaboration with product, UX and engineering teams
Ownership-oriented working environment
Opportunity to work on scalable cloud-native platform systems

What’s in It for You?

🌍 Remote-friendly – Work from anywhere

💰 Competitive salary + performance-based bonus – Your success is rewarded!

🌟 Flexible benefits – Spend it on what fits your lifestyle, whether it’s wellness, sports, or insurance for your furry companion.

📚 Learning & development opportunities – Grow with us.

🎉 A fun, dynamic team – Work with smart, driven people who love what they do.

Senior Backend Developer

Key Skills

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