Senior Software Engineer-Python

Senior Software Engineer, Python - India CoE

About the Role

InvoiceCloud is expanding our India Center of Excellence to mirror and extend U.S. engineering capabilities. As a Senior Software Engineer on the Python platform team for IVR Technology Group, you will design and build production backend services across communications, billing, and payment solutions, set the engineering bar through code and design reviews, and mentor mid-level engineers into senior contributors. Our core stack includes Linux (Ubuntu), Python (Django/DRF/FastAPI), and telephony (Asterisk/FAST AGI, NANP), with selective modernization of legacy .NET/Java services. You will report to the Engineering Manager, Python (India CoE).

IVR Technology Group, a subsidiary of InvoiceCloud, is a managed CPaaS services provider specializing in secure PCI-compliant, cloud-based customer engagement solutions that streamline voice, text and email interactions to enhance the customer experience.

Responsibilities

• Design & build production services: Own end-to-end design and implementation of Python services (Django/DRF/FastAPI) - data models, API contracts, queues, caching, and DB optimization. Define non-functional requirements for performance, reliability, and security.

• Technical leadership: Set the engineering bar through design reviews, code reviews, observability standards, and secure-by-default practices. Drive technical decisions independently. Contribute to modernization of select .NET/Java services as they migrate to Python.

• Mentorship: Coach mid-level and junior engineers through pairing, design feedback, and structured code review. Grow IC depth across the team and raise the quality bar through example.

• Delivery ownership: Break down complex initiatives into estimable units, surface risks early, and operate independently within sprint and quarterly commitments. Drive cycle time, defect rates, and system stability through data.

• Operations & reliability: Own observability for services you ship (logs/metrics/tracing), participate in on-call rotations, drive root-cause analysis on incidents, and own the runtime reliability of your code in production.

• Cross-functional & compliance: Partner with Engineering, Product, Security, and U.S.-based teams across time zones. Build to PCI/SOC2/SOX standards via policy-as-code and secure-by-default design.

Education-B.tech

Qualifications

• Experience: 8-12 years in software engineering, including 5+ years building production Python backends on Linux with Django/DRF/FastAPI. Hands-on with distributed systems, queues, and high-throughput workloads. Telephony exposure (Asterisk/FAST AGI/NANP, SIP/TLS, NAT traversal, SRTP) and VoIP diagnostics with PCAP tools (Wireshark/tcpdump) across SIP ladders, RTP, codec negotiation, jitter, packet loss, and QoS is a plus. Legacy .NET/Java modernization experience is a plus.

• Technical: Services/API architecture, microservices, queues (Celery/RabbitMQ/Kafka), caching (Redis), and DB optimization (PostgreSQL/MySQL - query plans, indexing, partitioning); ORM and raw SQL fluency. Docker, GitLab CI/CD, Azure. Observability stacks for logs/metrics/tracing and performance tuning for high-throughput workloads. Secure coding standards and API hardening. Experience building in regulated SaaS (PCI/SOC2/SOX) preferred.

• Leadership & communication: Mentor mid-level engineers into senior contributors. Exercise strong judgment to balance speed, risk, and technical debt. Communicate clearly with engineers, architects, and product partners; drive clarity in ambiguous contexts through structure, focus, and prioritization.