About Us
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.
About 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.
The ideal candidate enjoys designing large-scale distributed systems, writing clean and reliable backend code, and working closely with cross-functional teams across firmware, app, and DevOps. This role is ideal for engineers who want deep ownership, architectural influence, and the opportunity to shape the technical foundation of a fast-growing product.
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.
Required Skills
- Strong proficiency in Java/Kotlin with deep experience in Spring Boot.
- Hands-on experience designing and scaling distributed backend systems.
- Solid understanding of PostgreSQL, DynamoDB, caching, and queueing systems.
- Experience working with AWS services such as EKS, EC2, RDS, S3, and Lambda.
- Familiarity with Docker, CI/CD pipelines, and cloud-native deployments.
- Strong grasp of system design fundamentals (scalability, reliability, fault tolerance).
- Ability to debug complex production issues in distributed environments.
- Strong communication and collaboration skills across technical and non-technical teams
Qualifications
- Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or related
- 7–10+ years of backend engineering experience, including team or project leadership.
- Demonstrated experience owning production systems at scale..
Optional / Nice-to-Have Skills
- Experience with Python and FastAPI for microservices.
- Background in FinTech or payment gateway integrations.
- Exposure to IoT or device synchronization systems.
- Experience scaling systems from early-stage to high-traffic production systems.
- Contributions to open-source or technical writing.
Why Join Us?
- Work on cutting-edge backend systems powering next-gen consumer electronics.
- Collaborate closely with firmware, hardware, product, and mobile teams.
- Own backend architecture in a fast-growing environment backed by Shark Tank India S3.
- Build software that directly impacts 1M+ kirana stores across India.
- Tackle meaningful problems involving IoT, offline-first architecture, and large-scale retail workflows.
- Grow with a company that values ownership, craftsmanship, and continuous learning.
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