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About AffinityAffinity is pioneering new frontiers in AdTech by building privacy-first advertising infrastructure that helps publishers maximize monetization and enables advertisers to reach the right audiences beyond walled gardens. Operating across 10+ markets in Asia, the US, and Europe, with a team of 500+ professionals, Affinity continues to innovate at scale in the global AdTech ecosystem.Role: Sr. Software Engineer Location: Mumbai (Malad)We are seeking a Senior Backend Engineer to design, develop, and maintain high-performance backend systems for products. This role involves building scalable, cloud-native applications, collaborating with cross-functional teams, and integrating AI/ML capabilities into our platforms. The ideal candidate is hands-on, technically strong, and experienced with modern backend architectures.Key ResponsibilitiesDesign, develop, and maintain backend services and APIs using PHP. Having experience with Python, and Go will be added advantageousImplement cloud-native solutions on GCP, ensuring scalability, reliability, and performance.Work on server-side architecture, networking, and high-load system design.Manage codebase, version control, and team collaboration using GIT.Collaborate with front-end, data, and product teams to deliver integrated solutions.Leverage AI/ML coding assist tools to enhance application functionality.Troubleshoot and optimize backend performance, database queries, and network interactions.Maintain high code quality through testing, code reviews, and adherence to best practices.Required Skills: Bachelor’s or Master’s degree in Computer Science, Engineering, or related field.5+ years of professional experience in backend development.Strong programming skills in PHP. Basic understanding of Python and Go.Hands-on experience with cloud platforms, preferably GCP.Solid understanding of server architecture, networking, and web development principles.Experience with version control systems (GIT), Linux terminal.Practical experience integrating or leveraging AI/ML coding assist tools in applications.Strong problem-solving skills, ownership mindset, and ability to work independently.