Senior Software Engineer - 3 (Billing)

About Exotel:

Exotel is the emerging market s leading full-stack customer engagement platform and business-focused virtual telecom operator. Incorporated in 2011, Exotel s cloud-based product suite powers 50 million daily engagements across voice, video, and messaging channels. Exotel serves over 6000 companies across 60+ countries, including India, SE Asia, the Middle East, and Africa.

Tech @ Exotel

• Exotel Engineering builds fault-tolerant, scalable, and real-time distributed systems.
• Our tech stack includes Golang, Java, PHP, MySQL, Apache Kafka, Kubernetes, Beanstalkd, and Elasticsearch.
• We follow best practices in clean abstractions, loosely coupled services, and DevOps-driven operations.
• We strongly believe in "you build it, you own it."

Team IPO Readiness:

The IPO Readiness pod owns Exotel s billing and revenue platform - real-time call/SMS billing, balance deduction, invoicing, payment processing, and credit control. The platform handles approximately 200k transactions per minute across Voice, Messaging, and other Exotel solutions.

Role: Member of Technical Staff 3

As an MTS-3 on IPO Readiness, you will design, build, and integrate components across the billing platform and support IPO-readiness initiatives (controls, monitoring, automation). You will work on feature delivery, production support, and cross-system integrations with ERP (Business Central), payment gateways, and the Zuora migration path.

Key Responsibilities:

Platform Development & Integration:

- Develop and maintain microservices and batch jobs in Golang, Java, or PHP

- Build and extend REST APIs and Kafka consumers/producers for billing events, sync flows, and fallback pipelines.

Must-Have Skills:

- Strong computer science fundamentals (data structures, algorithms).

- Proficiency in at least one of: Golang (preferred), Java, or PHP.

- Experience building scalable distributed systems and event-driven architectures.

- Hands-on MySQL - schema design, query tuning, replication awareness.

- Experience with Apache Kafka and asynchronous processing (consumers, lag, fallback/retry patterns).

- Kubernetes basics - pods, deployments, namespaces, ArgoCD or equivalent GitOps.

- DevOps mindset - you build it, you own it; comfortable with logs, metrics, and incident triage.

Good-to-Have Skills:

- Exposure to billing, invoicing, payments, or ERP integrations (Zuora, Business Central, Razorpay).

- Experience with Beanstalkd, Jenkins, Prometheus/Grafana/Loki.

- Scripting in Python for ops automation and report generation.

- Familiarity with ITGC/SOX-style controls and audit documentation.

Experience: 5-8 years

Location: Bangalore (On-site)