Daniel Woldehana

Senior Software Engineer

Actively looking · Member since 31 Aug 2026

Message

Location: Beltsville, United States

Desired salary: Unspecified

Work preference: Remote Only

Experience level: Senior

About

Professional summary

I am a Senior Software Engineer with over a decade of experience building high-performance backend platforms for healthcare, retail, and financial-services organizations.

I specialize in serverless and event-driven architecture, including AWS Lambda microservices, RESTful APIs with API Gateway, and asynchronous workflows powered by SQS and SNS.

I have strong experience with Python, Java, and Node.js, and I build scalable services that prioritize reliability, security, low latency, and operational efficiency.

I create automated CI/CD pipelines using GitHub Actions and Git, integrating unit, integration, and performance testing to support dependable continuous delivery.

I work closely with product, UX, engineering, and QA stakeholders to define service contracts and deliver systems aligned with business, clinical, compliance, and regulatory requirements.

I have delivered measurable production results, including cloud cost reductions, improved API performance, high availability, and systems capable of supporting large-scale concurrent traffic and transaction volumes.

Tech stack & tools

Working toolkit

Development

Git

Experience

Career history

Senior Software Engineer VillageMD

Mar 2022 – May 2026

Led the design and delivery of scalable backend platforms supporting virtual-care workflows for patients and providers across a national health network. Architected serverless microservices with AWS Lambda and Python, implemented RESTful APIs through API Gateway, and integrated secure connections with third-party EMR systems.

Designed event-driven workflows using SQS and SNS and built CI/CD pipelines with GitHub Actions and Git for automated testing and delivery. Reduced Lambda cost by 30%, generating approximately $120K in annual savings, while scaling services to 150,000 concurrent sessions with sub-second response times.

Software Engineer Walmart Inc.

Jul 2018 – Dec 2021

Developed and maintained an API Gateway platform providing secure, high-throughput connectivity for internal and external services across Walmart's distributed ecosystem. Built RESTful Java APIs with OAuth2 authentication and Node.js microservice endpoints for real-time order and inventory event processing.

Integrated DynamoDB for low-latency session management and created GitHub Actions CI/CD pipelines for automated build, test, and deployment processes. Improved API response latency by 25% to under 200 ms on average and supported 2 billion API calls annually with 99.95% availability.

Software Engineer FIXER Inc.

Apr 2016 – Jun 2018

Engineered secure backend services and microservice-based financial applications for Japanese banking clients. Developed Java services using event-driven architecture for encrypted transaction processing, and used AWS Lambda and serverless architecture for batch reconciliation workloads.

Integrated DynamoDB for immutable audit-log storage and established Git and GitHub Actions-based CI processes with quality gates and automated staging deployments. Increased transaction throughput by 40% to 12,000 transactions per minute, maintained 99.9% uptime, and reduced incident resolution time by 35% through monitoring and alerting.