# Sagar Rajani > Senior Software Engineer at Dark Matter Technologies Location: Greater Boston, United States Profile: https://flows.cv/sagarrajani I'm a Full Stack Engineer and Technical Lead with 7+ years of experience designing, developing, and scaling cloud-based applications across financial services and enterprise platforms. I specialize in building resilient software systems, leading high-performing teams, and driving end-to-end delivery in fast-paced agile environments. I’ve worked across the full stack—from architecting AWS multi-tenant infrastructures and reducing cloud spend, to developing dynamic front-end interfaces using Angular, Vue, and React. I’ve also integrated machine learning models into production workflows and built tools that enable faster, data-driven decision-making for users. Whether it's improving performance, mentoring engineers, or collaborating cross-functionally to meet critical deadlines, I enjoy solving complex problems that have real business impact. 🛠️ Core Skills: JavaScript, TypeScript, Java, Python, Angular, Vue.js, AWS, CI/CD, Microservices, SQL 💡 Interests: Scalable systems, developer experience, clean architecture, cost optimization Always open to connecting with fellow engineers, leaders, or teams working on challenging problems! ## Work Experience ### Senior Software Engineer @ Dark Matter Technologies Jan 2023 – Present | Philadelphia, Pennsylvania, United States Led an 8-person engineering team, maintaining 95% on-time sprint delivery while reducing production issues by 30% through improved code reviews and quality standards. Designed and implemented a multi-tenant AWS architecture supporting 200+ clients in a single account, improving data isolation, scalability, and cost efficiency. Built a centralized configuration management system using Amazon RDS and a client-facing UI, reducing client onboarding time from 4 weeks to real time. Spearheaded sprint planning and backlog grooming across teams, providing architectural guidance and ensuring long-term software quality. Temporarily joined a cross-functional team to improve an Angular-based underwriting tool, enhancing data navigation and accelerating loan decisions. Reduced AWS costs by 25% by optimizing S3 and DynamoDB usage, implementing resource tagging, and enforcing data retention policies. Mentored 3 junior engineers, fostering a culture of continuous learning through documentation, pair programming, and knowledge-sharing sessions. Identified and addressed technical risks early, collaborating with leadership to keep high-priority projects on track and aligned with business goals. ### Software Engineer II @ Black Knight Jan 2021 – Jan 2023 | Philadelphia, Pennsylvania, United States Led development of micro frontend components using Angular, Vue.js, and React, enabling modular, scalable UI integration with AI/ML-driven services (AIVA). Integrated AWS QuickSight dashboards directly into the app, enabling dynamic, in-app reporting for real-time client analytics. Partnered with DevOps to implement cross-region failover using AWS (us-east-1 to us-east-2), enhancing system availability and disaster recovery. Delivered 40% improvement in app performance by profiling and optimizing key front-end and backend services. Contributed to agile planning and sprint ceremonies, collaborating closely with QA to improve test coverage and release confidence. Mentored junior developers and participated in design discussions to ensure long-term maintainability and scalability. ### Software Engineer @ Black Knight Jan 2018 – Jan 2021 | Philadelphia, PA, United States Built a client-facing Angular application that surfaced AI insights from Black Knight’s AIVA platform, reducing user decision-making time. Designed and implemented a custom task queuing system with AWS DynamoDB to support scalable, client-specific workflows. Added advanced UI enhancements and keyboard shortcuts, cutting key user interactions by over 50%. Contributed to ongoing AWS infrastructure scaling and performance monitoring, ensuring high reliability and low latency. ### Software Engineer @ HeavyWater Inc. Jan 2018 – Jan 2018 | Philadelphia, Pennsylvania, United States Migrated CI/CD pipeline from Jenkins to AWS CodePipeline and CodeBuild, reducing build times and improving deployment reliability. Designed and implemented a Support Ticket System for AIVA, streamlining client issue tracking and internal error reporting. Contributed to automation and dev tooling improvements that helped scale AIVA’s internal infrastructure during early growth. ### Full Stack Software Developer Intern @ Imerza Jan 2017 – Jan 2017 | Sarasota, Florida, United States Developed and supported MVVM-based web applications using ReactJS and Knockout.js, including a virtual joystick interface to remotely control Unreal Engine applications hosted on distributed servers. Enabled real-time interactive virtual tours for clients, significantly improving accessibility and user engagement. Deployed and managed web applications on AWS, optimizing infrastructure for performance and cost. Applications are actively used by clients for immersive architectural and planning experiences. ### Associate Project Intern @ Tech Mahindra Jan 2015 – Jan 2015 | New Delhi, Delhi, India Contributed to Tech Mahindra’s project to digitize operations for the Municipal Corporation of Delhi (M.C.D), aimed at eliminating paper-based workflows. Appointed as Team Lead during the internship, overseeing development tasks and coordinating team efforts. Designed and built a Report Management System in Java that supported hierarchical approval workflows, enabling multi-level document sign-offs before reaching the Head of Department. Implemented an automated reminder system to prompt pending approvers, improving compliance and reducing turnaround delays. ## Education ### Master of Science (M.S.) in Computer Science University of Florida Jan 2016 – Jan 2017 ### Senior Certificate Program in Computer Science University of Florida Jan 2016 – Jan 2016 ### Bachelor of Technology (BTech) in Computer Science Jaypee University of Information Technology Jan 2012 – Jan 2015 ## Contact & Social - LinkedIn: https://linkedin.com/in/sagarrajani --- Source: https://flows.cv/sagarrajani JSON Resume: https://flows.cv/sagarrajani/resume.json Last updated: 2026-03-22