Sajankumar

Architected and led an AI-driven image moderation pipeline using open-source ML models, FastAPI microservices, and containerised Kubernetes-based processing focusing on accuracy, cost efficiency, and horizontal scalability. Designed secure, production-grade FastAPI endpoints integrated with JWTbased auth, deployed on AWS EKS Service and lamda management and Managed AWS Cognito Identity for zero-credential access patterns. Built data-heavy React & TypeScript dashboards for content review workflows, integrating real-time status feeds and complex filtering UIs backed by MongoDB queries. Established stack for API latency, queue depth, and processing Skills: Full-Stack Development · AI Engineering · FastAPI · Amazon Web Services (AWS) · Team Leadership · Agile Application Development · Cloudflare · Cloud Computing · Software Architecture · Software Development · MongoDB

At RTL, I led major technical transformations that significantly enhanced scalability, reliability, and developer productivity across multiple domains. I modernized the frontend architecture by introducing micro-frontends and Astro builds, enabling faster, modular development. I executed a strategic migration from Adobe Analytics to Snowplow, saving the company over €200K annually. As part of a broader modernization effort, I upgraded the codebase from Next.js 12 to 14 and refactored legacy systems, including migrating the RTL video player from JavaScript to TypeScript reducing technical debt and improving long-term maintainability. To elevate code quality and confidence in releases, I introduced Vitest, Testing Library, and MSW, increasing test coverage from 0% to 75%. I also designed and implemented OpenID Connect authentication using Duende Identity Server and .NET Core across multiple applications, while supporting integration of the web based subscription payment service. In addition to owning the end-to-end integration testing strategy, I actively mentored engineers, refined development workflows, and contributed to scaling high-performing teams through technical hiring support. Skills: Next.js · React.js · Node.js · Team Leadership · Back-End Web Development · Agile Application Development · Cloud Computing · Software Architecture · Software Development · Microsoft Azure · MongoDB · .NET Architecture

At Ultimaker, I led the development of a robust cloud platform powering 3D printers and the Ultimaker Marketplace. I significantly enhanced the performance and usability of the frontend, delivering high-quality applications with a focus on scalability and maintainability. I built and implemented a branded UI design system with accessibility standards, enabling consistency across products and improving user experience. I collaborated closely with backend engineers (often pair programming) and product stakeholders to align technical decisions with business goals. I have contributed automated testing practices using Vitest and Cypress, improving test reliability and coverage. Actively involved in hiring, I helped scale the engineering team with top talent, while driving quality through detailed code reviews and Agile delivery. Skills: Team Leadership · React.js · TypeScript · Flask · MongoDB · Back-End Web Development · Agile Application Development · Cloud Computing · Software Architecture · Software Development · Google Cloud Platform (GCP)

At Elsevier, I played a key role in modernizing legacy codebases, significantly improving the performance, scalability, and maintainability of core publishing platforms. I led the development of efficient, accessible frontend applications and introduced a reusable UI branding library, streamlining design consistency across multiple product teams. Collaborating closely with project managers, I helped define realistic coding milestones and ensured on-time delivery through transparent communication and Agile best practices. I contributed to high-level architectural decisions, conducted thorough code reviews, and upheld engineering standards through detailed documentation and QA processes. Additionally, I leveraged AWS services including EKS and ECR to implement scalable, containerized deployments, improving infrastructure reliability and deployment efficiency. Skills: React.js · TypeScript · Nextjs · Nodejs · Team Leadership · Java Spring boot · Back-End Web Development · Agile Application Development · PostgreSQL · Cloud Computing · Software Architecture · Software Development · Amazon Web Services (AWS)

At Geek Soft B.V, I contributed to the development and maintenance of the KLM careers platform, ensuring performance, stability, and scalability. I mentored team members on new technologies and design approaches, fostering a culture of continuous improvement. I collaborated closely with backend engineers and testers to deliver high-quality features, and actively reviewed project plans identifying opportunities for cost optimization and engineering process enhancements across the team. Skills: Microsoft Azure · TypeScript · Nodejs · Angular · React.js · Back-End Web Development · Agile Application Development · Cloud Computing · Team Leadership · PostgreSQL · Software Architecture · Software Development · Software Development Life Cycle (SDLC)