Staff Backend Engineer - Phone Billing

Own the end-to-end technical health of Phone Billing — proactively identify architectural bottlenecks, correctness and reliability risks, and technical debt; define and drive the roadmap to improve billing accuracy, reconciliation, scalability, observability, and cost efficiency as the platform scales to 10x its current volume.

Drive 1–2 high-impact initiatives end-to-end — take ownership from problem definition and technical discovery through architecture, implementation, rollout, and measurement, ensuring the initiatives deliver measurable improvements to Phone Billing in areas such as accuracy, reliability, scalability, or cost efficiency.

Architect for massive scale : Own the high-level architecture and scaling decisions for core Phone platform components, including CPaaS abstractions, provider adapters, and shared messaging/voice APIs that support billions of monthly events.

Own Phone Billing end to end : usage metering, rating, reserve/commit lifecycle, idempotency, reconciliation, and audit trails for the Phone channels - with zero tolerance for double-charging or lost usage

Lead the evolution of Revenue Growth into a configuration-driven, rules-based platform that adapts to new regulatory and carrier requirements without invasive engineering change

Work hands-on with technologies like NestJS, Firestore, MongoDB, PostgreSQL, Redis, Queuing Systems, Data Warehousing Systems and Service Mesh-based microservices

Drive high-concurrency innovation : Lead the design and execution of cross-cutting initiatives to improve reliability, latency, and throughput across time-sensitive APIs and workflows serving millions of businesses.

Drive observability and resilience by evolving our monitoring, alerting (Prometheus/Grafana), and incident response strategies - including the financial invariants that must be alerted on, not just the technical ones

Leverage LLMs and AI tools to write, refactor, test, and debug code efficiently - while implementing guardrails to reduce hallucination and boost reliability

Partner with product, infra, security, finance and legal teams to ensure data integrity, access control, and compliance across phone services

Develop EM I leaders and senior engineers, build leadership pipeline, succession planning and raise the hiring bar

Participate in design reviews, deep dives, and on-call rotations to support a high-bar culture of accountability and operational excellence

8+ years of backend engineering experience with 2+ years of Staff role , with a proven track record of designing fault-tolerant systems that operate at a scale of billions of hits or events.

Deep expertise in distributed systems, event-driven architectures, and asynchronous job processing

Demonstrated experience building systems where correctness is non-negotiable - metering, ledgers, billing, payments, or comparable transactional domains - with a working grasp of idempotency, exactly-once semantics, and reconciliation

Proven experience optimizing availability, performance, and reliability in real-world systems under load

Strong experience with relational and NoSQL data models (especially with complex transactional data)

Experience designing policy- or rules-driven systems that evolve with external requirements rather than hard-coding them

Familiarity with monitoring, SLOs, and root-cause analysis in production environments

Familiarity with hallucination mitigation strategies (e.g., code constraints, test scaffolding, embeddings, context injection)

Excellent communication and cross-functional collaboration skills, including with Finance, Legal and external partners

A pragmatic, hands-on leader who balances long-term vision with iterative execution

Experience with usage-based billing or metering engines in a high-volume product, specifically managing millions of transactional events per hour.

Exposure to telecom trust and compliance regimes - 10DLC, toll-free verification, TCPA/TSR, DLT, carrier filtering or number portability

Experience building provider-agnostic integration layers across multiple third-party vendors

Experience working with AI Tools, Communication APIs (Twilio, Plivo etc)

Contributions to open-source tools, internal platforms, or engineering blogs