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.
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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.
CozmoX AI
