Backend Lead Engineer

About the job

We are looking for a hands-on Backend Lead Engineer to own, scale, and optimize the backend systems powering our next-generation smart calculator ecosystem. This role involves leading backend architecture, mentoring engineers, and building robust services that support payments, IoT device sync, inventory, and real-time retail workflows. Key Responsibilities Backend Architecture & Development • Design and develop scalable backend services using Java / Kotlin and Spring Boot. • Build and maintain APIs for payments, inventory, device sync, and retail workflows. • Optimize system performance, database queries, and API latency for real-world usage. • Lead architectural decisions in collaboration with the CTO and Engineering Manager. Technical Leadership & Mentorship • Guide backend engineers on best practices, design patterns, and system design. • Conduct code reviews, ensure code quality, and maintain engineering standards. • Support team members in debugging complex backend issues and production incidents. Cross-Functional Collaboration • Work closely with the Mobile App team to define API contracts and data flows. • Collaborate with Hardware & Firmware teams to design device communication protocols. • Coordinate with DevOps on infrastructure, deployments, monitoring, and CI / CD. System Reliability & Operations • Own critical production systems, including incident response and root-cause analysis. • Implement logging, monitoring, and observability practices across services. • Ensure backend readiness for 10x scale and multi-region deployments.

Requirements

• Java
• Kotlin
• Spring Boot
• PostgreSQL
• AWS

Qualifications

• 7–10+ years of backend engineering experience

Preferred Technologies

• Java
• Kotlin
• Spring Boot
• PostgreSQL
• AWS

About the company

We're building the next generation of smart calculators for modern retailers — tools that go far beyond basic math. These devices integrate dynamic QR code generation, digital payments, inventory tracking, and more. Think of it as a POS terminal disguised as a calculator — but way smarter. Our mission is simple yet ambitious : to replace over 30 million traditional calculators sitting on shop counters across the world. If you're passionate about creating intuitive, impactful hardware + software systems that empower everyday users — join us in redefining what a calculator can do.