Backend Developer at CozmoX AI

CozmoX provides AI employees powered by advanced voice technology that enables natural, human-like conversations.

These digital workers communicate fluently with customers and stakeholders while handling repetitive tasks 24/7. Through our no-code platform, businesses can deploy AI employees that manage entire processes through voice interactions, replacing multiple software tools with unified solutions.

We’ve unveiled 3 powerful AI employees, with more to come: Liza (Sales Executive) - Engages in natural voice conversations throughout the sales cycle, from initial prospect calls to negotiations and closure. She handles qualification calls, follow-ups, and maintains CRM records while building rapport through intelligent dialogue. Alex (Debt Collector) - Conducts professional voice communications for collections, speaking with customers to arrange payments, negotiate plans, and ensure timely follow-ups while maintaining regulatory compliance. Zara (Receptionist) - Masters voice-based front-office management, engaging in natural conversations to route calls, schedule appointments, take detailed messages, and resolve customer inquiries with a friendly, professional tone.

Like the industrial revolution transformed farming, we're revolutionizing workplace communication. By automating routine conversations and tasks, human teams can focus on creativity, problem-solving, and business growth.

We're the first in the Middle East and Africa to offer this kind of technology, but we work with businesses all over the world. We're backed by Y Combinator, Goodwater Capital, Dubai Future District Fund, Rebel Fund, and Trampoline Venture Partners, and have raised $3M in our latest round.

About the Role

We are seeking a skilled and experienced Backend Developer with 4–6 years of hands-on experience in building robust, scalable, and fault-tolerant backend systems. The ideal candidate is proficient in modern backend technologies and architectures and is excited to work in a high-growth, dynamic startup environment. This role involves working with microservices, cloud infrastructure, and modern development practices including test-driven development.

Key Responsibilities

• Design, develop, and maintain scalable microservices using Python, Go, or Node.js.

• Build and maintain RESTful APIs to support web and mobile applications.

• Develop event-driven and asynchronous systems using Apache Kafka.

• Deploy and manage services using Kubernetes in AWS cloud environments.

• Work with SQL and NoSQL databases to store and retrieve data efficiently.

• Write clean, maintainable, and well-tested code following Test-Driven Development (TDD) practices.

• Ensure systems are fault-tolerant, scalable, and performant under load.

• Collaborate cross-functionally with frontend engineers, DevOps, and product teams.

• Participate in code reviews, architecture discussions, and team ceremonies.

• Continuously improve system design and development workflows. Required Skills & Qualifications

• 4–7 years of professional backend development experience.

• Proficiency in Python, Go, or Node.js (at least one language required).

• Strong understanding and hands-on experience with Microservices architecture.

• Experience with Kafka or other messaging systems (e.g., RabbitMQ).

• Solid understanding of both SQL (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, DynamoDB) databases.

• Working experience with AWS services (e.g., EC2, S3, RDS, Lambda).

• Hands-on experience with Kubernetes and containerized application deployment.

• Proven experience in writing and maintaining RESTful APIs.

• Commitment to Test-Driven Development (TDD) and clean coding practices.

• Strong debugging, problem-solving, and analytical skills.

• Ability to thrive in a fast-paced, dynamic startup environment.

• Familiarity with observability and monitoring tools (e.g., Prometheus, Grafana, ELK Stack). Nice to Have

• Exposure to gRPC APIs.

• Familiarity with Large Language Models (LLMs) and their integration into applications.

• Experience with Voice Technologies, such as speech recognition, text-to-speech (TTS), conversational AI

• Understanding of real-time streaming and event-driven systems. Why CozmoX AI?

• Work with cutting-edge technologies in a collaborative and innovative team.

• High ownership, visibility, and impact on product development.

• Opportunity to work on scalable systems from the ground up.

About Us

CozmoX AI is building the operating system for voice-native AI employees—autonomous agents that handle sales, support, collections, and more. Backed by Y Combinator and top-tier global investors, the company is scaling rapidly across markets.

We will provide all the details during the interview process.