Sr Backend Developer

Shape the future with Delphi Consulting. We don't just hire talent—we invest in people who are passionate about innovation, continuous learning, and creating meaningful impact. Join a team that's shaping the future of AI, data, cloud, and digital transformation while solving complex business challenges for leading enterprises. If you're ready to build what's next, your journey starts here.

We are seeking a seasoned and visionary Senior Backend Developer to lead technical initiatives and drive innovation across our client projects. This role bridges technical excellence with client engagement— architecting sophisticated solutions, mentoring junior talent, and translating complex business requirements into scalable, AI-powered applications. The ideal candidate is not just a developer but a technical leader who understands business processes, modern development practices, and can help drive transformative value for our clients using cutting-edge Python technologies and AI frameworks.

Responsibilities

• Architect and design scalable applications using FastAPI, implementing advanced features and optimization strategies
• Lead the development of sophisticated AI workflows using LangChain, LangGraph, and related frameworks for production environments
• Build complex Streamlit applications with custom components, advanced data visualizations, and optimal user experiences
• Engage directly with clients to understand business requirements and translate them into technical solutions
• Mentor junior developers through code reviews, technical guidance, and knowledge sharing sessions
• Oversee technical aspects of projects from planning and architecture through deployment and maintenance
• Research and implement emerging technologies, contributing to R&D initiatives and innovation strategies
• Establish testing strategies, CI/CD pipelines, and deployment best practices across projects
• Facilitate technical workshops and stakeholder meetings to align on solutions and deliverables
• Monitor application performance and lead troubleshooting efforts from both technical and business impact perspectives.

Qualifications

• 5+ years of Python development experience with production-level applications and proven technical leadership
• Expert-level proficiency in FastAPI including advanced features like dependencies, middleware, and background tasks
• Advanced Streamlit development skills including custom components, session state management, and performance optimization
• Deep expertise in LangChain/LangGraph for building and deploying production AI applications
• Strong understanding of software architecture patterns, design principles, and scalable system design
• Extensive experience with database design, optimization, and management (PostgreSQL, No SQL, etc.)
• Proficiency in cloud platforms and deployment strategies with hands-on DevOps experience
• Experience with containerization (Docker, Kubernetes) and modern development workflows
• Proven track record in API security, authentication, authorization, and compliance requirements
• Excellent client-facing and stakeholder management skills
• Experience leading technical teams or mentoring developers is highly valued
• Background in consulting or client-services environments is a plus.