I am a Senior Software Engineer with over 8 years of experience designing, developing, and scaling secure, cloud-native web applications. I have worked across healthcare, e-commerce, and fintech sectors, leveraging my expertise in React, Node.js/Express, PostgreSQL, and AWS to deliver solutions that improve scalability, resilience, and business outcomes. I am passionate about driving architectural decisions, mentoring engineers, optimizing performance, and ensuring security and compliance. Throughout my career, I have led projects that have transformed platforms by implementing microservices, improving API latency, integrating CI/CD automation, and enhancing observability. Certified in AWS Solutions Architect Professional, CISSP, and Google Professional Cloud Architect, I take pride in strengthening security practices while fostering team growth and delivering high-quality software that meets business goals.

Doyin Sunmola

I am a Senior Software Engineer with over 8 years of experience designing, developing, and scaling secure, cloud-native web applications. I have worked across healthcare, e-commerce, and fintech sectors, leveraging my expertise in React, Node.js/Express, PostgreSQL, and AWS to deliver solutions that improve scalability, resilience, and business outcomes. I am passionate about driving architectural decisions, mentoring engineers, optimizing performance, and ensuring security and compliance. Throughout my career, I have led projects that have transformed platforms by implementing microservices, improving API latency, integrating CI/CD automation, and enhancing observability. Certified in AWS Solutions Architect Professional, CISSP, and Google Professional Cloud Architect, I take pride in strengthening security practices while fostering team growth and delivering high-quality software that meets business goals.

Available to hire

I am a Senior Software Engineer with over 8 years of experience designing, developing, and scaling secure, cloud-native web applications. I have worked across healthcare, e-commerce, and fintech sectors, leveraging my expertise in React, Node.js/Express, PostgreSQL, and AWS to deliver solutions that improve scalability, resilience, and business outcomes. I am passionate about driving architectural decisions, mentoring engineers, optimizing performance, and ensuring security and compliance.

Throughout my career, I have led projects that have transformed platforms by implementing microservices, improving API latency, integrating CI/CD automation, and enhancing observability. Certified in AWS Solutions Architect Professional, CISSP, and Google Professional Cloud Architect, I take pride in strengthening security practices while fostering team growth and delivering high-quality software that meets business goals.

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Work Experience

Software Engineer at Teksystems Inc
January 1, 2022 - September 4, 2025
Developed a secure healthcare portal utilizing Angular, Django, and PostgreSQL with HIPAA-compliant access controls and audit logging, resulting in a 30% reduction in data retrieval times. Implemented RBAC, OAuth2/JWT authentication, session hardening, CSRF protection, and encrypted secret management. Designed resilient idempotent, paginated APIs that decreased API timeouts by 25%. Containerized services with Docker and deployed to Azure for more consistent environments and faster onboarding. Introduced server-side rendering and code splitting that improved First Contentful Paint by 28% on low bandwidth. Automated testing with Jest, Mocha, and Cypress achieving over 80% coverage and lowering defects. Built scheduled reporting and export pipelines that eliminated manual report assembly. Enabled feature toggles for safer, incremental releases. Collaborated with security and compliance teams to pass audits without critical findings.
Senior Full stack Engineer at Ploutos Baker Consulting Services
January 1, 2022 - Present
Architected and delivered a high-traffic e-commerce platform using React, Node.js, and GraphQL, boosting conversion by 30% and generating over $1M in incremental revenue. Decomposed a monolithic application into Dockerized microservices on AWS, achieving a 35% reduction in API latency and better fault isolation. Implemented GraphQL federation with Redis caching to minimize over-fetching and reduce page payloads by 25%. Developed CI/CD pipelines with GitHub Actions and Jenkins, reducing time to production by 30%. Introduced observability practices using OpenTelemetry and CloudWatch, improving mean time to recovery by 40%. Enhanced security with OAuth2/JWT, RBAC, and rate-limiting, successfully blocking credential stuffing attacks with no user friction. Led A/B testing and feature-flag rollouts to increase add-to-cart events by 12%. Optimized Postgres queries and deployed read replicas, reducing report endpoint latency from 1.8s to 450ms. Improved test coverage to 85% with comprehensive
Web Developer at University of California
January 1, 2019 - September 4, 2025
Developed a secure healthcare portal using Angular, Django, and PostgreSQL with HIPAA-aligned access controls and audit logging, improving data retrieval by 30%. Implemented RBAC, OAuth2/JWT authentication, session hardening, CSRF protection, and encrypted secrets management. Designed robust, idempotent, paginated APIs which reduced API timeouts by 25%. Containerized services with Docker and deployed to Azure for reproducible environments and faster onboarding. Applied server-side rendering and code-splitting techniques improving First Contentful Paint by 28% under low bandwidth scenarios. Automated tests with Jest, Mocha, and Cypress achieving 80%+ coverage and reducing escaped defects by 15%. Built scheduled reporting jobs and export pipelines to support clinical teams, eliminating manual report compilation. Utilized feature toggles to safely decouple release and deploy, enabling incremental feature launches. Worked closely with security and compliance teams to successfully pass inte
Special Project Manager at Bank PHB
December 31, 2016 - September 4, 2025
Led comprehensive project coordination from data gathering through Go-LIVE and post-launch optimization, ensuring timely delivery and operational efficiency. Collaborated with IT teams and external vendors to design workflows, develop remittance applications, and integrate third-party solutions with internal systems. Managed full application lifecycle including requirements, design, build, testing, deployment, and optimization. Created and delivered training programs leveraging adult learning strategies to boost adoption and reduce support needs. Supervised and mentored junior staff while remotely managing over 100 retail agents nationwide to maintain consistent operations. Developed structured workflows for critical system maintenance minimizing downtime. Oversaw daily product management, delegating tasks and tracking deliverables to ensure customer satisfaction. Designed onboarding and career development initiatives improving team productivity and morale. Managed vendor relationships

Education

BSc Health Services at D’Youville College, Buffalo NY
August 1, 2004 - May 1, 2007
MBA Health Service Administration at New York Institute of Technology, Old Westbury
October 1, 2007 - May 1, 2009

Qualifications

AWS Certified Solutions Architect – Professional
January 11, 2030 - September 4, 2025
Certified Information Systems Security Professional (CISSP)
January 11, 2030 - September 4, 2025
Google Professional Cloud Architect
January 11, 2030 - September 4, 2025
Oracle Certified Professional, Java SE Programmer
January 11, 2030 - September 4, 2025

Industry Experience

Healthcare, Retail, Financial Services, Software & Internet

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Expert
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