Senior Software Engineer

Senior Software Engineer – Engineering Experience: 5–8 Years Location: Kolkata, India About Practice by Numbers Practice by Numbers (PbN) is a fast-growing SaaS platform helping healthcare organizations leverage data, automation, patient engagement, and operational intelligence to improve business performance and patient outcomes. We build highly scalable cloud-native products serving thousands of customers across North America. We are looking for a Senior Software Engineer who combines strong hands-on engineering skills with the maturity to own complex features end-to-end, mentor peers, and raise the technical bar across the team. Role Overview As a Senior Software Engineer, you will design, build, and own significant components of our SaaS platform. You will take features from ambiguous requirements through design, implementation, testing, and production operation. You will make sound technical decisions within your area, contribute to architecture discussions, and mentor engineers around you. This role requires strong software engineering fundamentals, solid experience with distributed systems and cloud-native development, and a track record of delivering reliable, high-quality software. The ideal candidate is a self-driven builder who takes ownership, cares deeply about quality, and enjoys solving hard technical problems. Key Responsibilities Software Engineering Design, build, and own end-to-end features and services across the platform. Build scalable APIs, backend services, and cloud-native applications. Build and operate event-driven workflows using Kafka-compatible messaging, background workers, and reliable async processing patterns. Write clean, well-tested, maintainable, and performant code. Contribute to frontend and full-stack development as needed. Improve system performance, scalability, reliability, and security within your area. Troubleshoot and resolve production issues, including on-call participation. Technical Contribution & Design Translate ambiguous requirements into well-structured technical designs. Participate in and contribute to design reviews and architecture discussions. Make pragmatic technical decisions and clearly document trade-offs. Identify technical risks early and propose practical solutions. Drive adoption of reusable components, shared services, and engineering best practices. Quality & Operational Excellence Uphold high standards for design, code quality, testing, and operational readiness. Write and review unit, integration, and automated tests. Improve observability through monitoring, logging, and alerting for your services. Participate actively in code reviews and provide constructive feedback. Collaboration & Mentorship Mentor and support junior engineers through pairing and code reviews. Collaborate closely with product, design, QA, and DevOps teams. Contribute to a culture of ownership, learning, and engineering excellence. AI-Enabled Engineering Use modern AI tools to improve development speed, quality, and productivity. Apply AI-assisted development practices while maintaining strong engineering standards, security, and code quality. Explore practical opportunities to accelerate engineering outcomes. Required Qualifications Bachelor’s or Master’s degree in Computer Science or a related discipline. 5–8 years of software engineering experience building production-grade applications. Strong experience building and operating cloud-native SaaS or web applications. Solid understanding of software design, distributed systems, and modern engineering practices. Proven ability to own and deliver complex features independently. Experience debugging and resolving performance, scalability, and reliability issues. Technical Expertise Backend Technologies Python Django / Django REST Framework FastAPI SQLAlchemy / Alembic Node.js REST APIs Microservices Architecture Asynchronous Processing Event-driven Architecture Transactional Outbox / Background Workers Frontend Technologies React.js Next.js TypeScript Modern JavaScript State Management Frameworks Data & Storage PostgreSQL Redis Kafka / Redpanda / Amazon MSK Elasticsearch / OpenSearch AWS S3 / Object Storage Database Design Query Optimization Caching Strategies Cloud & Infrastructure AWS ECS / EKS / Fargate Lambda API Gateway S3 RDS ElastiCache MSK CloudWatch Terraform / Infrastructure as Code DevOps & Reliability Docker CI/CD Pipelines Monitoring & Observability OpenTelemetry New Relic / CloudWatch Test Automation Incident Management Software Design Object-Oriented Design Design Patterns SOLID Principles System Design Secure Coding Practices Preferred Qualifications Experience building multi-tenant SaaS platforms. Experience with large-scale transactional or data-intensive workloads. Exposure to healthcare technology or data-intensive applications. Experience mentoring engineers and leading feature development. Familiarity with Kubernetes. Experience building ETL / data pipelines (good to have). Exposure to Databricks or similar data/analytics platforms (good to have). What We Look For Strong hands-on technical skills and engineering fundamentals. Ability to own features end-to-end with minimal supervision. Good system design and problem-solving abilities. Bias toward execution, quality, and ownership. Strong collaboration and communication skills. Willingness to mentor and lift up the team. Passion for building high-quality software and continuous learning.