Available to hire
I’m Saar Baraness, a Senior Software Engineer with 9+ years of experience building scalable software solutions. I specialize in Go, Python, Node.js, React, AWS, and Gen AI/LLM, and I thrive on turning complex problems into robust, maintainable systems.
I’m a fast learner with a growth mindset, easy-going, and collaborative, adept at working across cross-functional teams to deliver high-impact products.
Work Experience
Senior Software Engineer at Andersen Lab
July 1, 2022 - PresentDelivered an AI-powered HIPAA-compliant EHR that accelerated charting, surfaced decision support at the point of care, organized results by urgency, and simplified inter-team coordination. Designed and scaled service APIs in Python/Django and Node.js with clear boundaries and zero-downtime releases, routing e-prescriptions, lab orders, and results through AWS SQS and SNS with Lambda to support high-throughput clinical operations. Built a clinician platform in React and Next.js with RBAC, accessible forms, and offline-ready drafts to keep care moving when connectivity is limited. Launched a scheduling assistant and a documentation scribe using LLM with RAG over approved notes stored in S3 using LangChain and OpenSearch, with strict redaction and encryption for all prompts and contexts. Defined domain models and service contracts, built versioned gRPC APIs in Go and FastAPI, ensured backward-compatible releases, improved responsiveness during peak clinic hours, and supported audit-friend
Software Engineer at MoonPay
June 1, 2022 - October 16, 2025Led on- and off-ramp checkout and payments end-to-end for a global business customer base with clear customer journeys, strong trust signals, and alignment with PCI-DSS and SCA across regions. Designed and implemented payment microservices in Go (Fiber/gRPC) and Node.js with domain-owned gRPC and REST APIs; built a double-entry ledger with virtual accounts; idempotent workflows with saga coordination and audit-friendly reconciliation across providers. Shipped business customer checkout and partner consoles in React/Next.js and Vue.js; created a shared design system; improved accessibility and localization; tuned performance for fast interactive loads. Automated transactions through real-time orchestration on Kafka and AWS Kinesis with safely retryable paths, resilient provider failover, and ML-driven risk signals for risk-aware routing and transaction holds. Ran production on EC2 and Kubernetes with Terraform enforced least-privilege access, encrypted secrets with KMS, and CloudWatch-b
Software Engineer at Booking.com
January 1, 2019 - October 16, 2025Led the development of a scalable and reliable global booking platform, focused on improving user experience and performance through continuous feature enhancements and system optimizations. Transitioned the platform from a Ruby-based monolithic architecture to microservices using Python/Django, and Node.js, implementing event-driven patterns, REST/GraphQL APIs, Kafka, Redis, and PostgreSQL to ensure fault tolerance and high availability during high-traffic periods. Spearheaded frontend features using React, Vue.js, and TypeScript, focusing on performance optimization, accessibility, and consistency through server-side rendering and efficient caching. Delivered real-time collaboration features such as notifications, live chat, and presence detection with WebSocket and WebRTC, and Go backends for low latency and high uptime. Pioneered automation of CI/CD pipelines using GitHub Actions, Docker, Kubernetes, Terraform, and AWS, establishing a resilient deployment process with feature flags
Education
Bachelor of Science at Delft University of Technology
January 1, 2013 - January 1, 2016Qualifications
Industry Experience
Software & Internet, Healthcare, Gaming, Financial Services
Hire a Full Stack Developer
We have the best full stack developer experts on Twine. Hire a full stack developer in Amsterdam today.