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Hi, I’m Oscar Garcia, a senior full-stack engineer with 10+ years delivering secure, scalable platforms from front-end to back-end. I specialize in React, Angular, .NET, and Django, with PostgreSQL, Redis, and cloud-native deployments on AWS and Azure. I’ve led enterprise CI/CD pipelines and ensured compliance across healthcare, fintech, and AI initiatives, empowering teams to ship reliable software. When tech throws a curveball, I sip my coffee and prepare for a showdown with the code—collaborating with designers, product managers, and stakeholders to deliver mission-critical AI features on accelerated timelines. I’m passionate about mentoring teams, improving performance, and strengthening security in complex environments.…Hi, I’m Oscar Garcia, a senior full-stack engineer with 10+ years delivering secure, scalable platforms from front-end to back-end. I specialize in React, Angular, .NET, and Django, with PostgreSQL, Redis, and cloud-native deployments on AWS and Azure. I’ve led enterprise CI/CD pipelines and ensured compliance across healthcare, fintech, and AI initiatives, empowering teams to ship reliable software. When tech throws a curveball, I sip my coffee and prepare for a showdown with the code—collaborating with designers, product managers, and stakeholders to deliver mission-critical AI features on accelerated timelines. I’m passionate about mentoring teams, improving performance, and strengthening security in complex environments.

Oscar Garcia

Full Stack Developer, Back-End Developer, Cloud Developer, +5

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Hi, I’m Oscar Garcia, a senior full-stack engineer with 10+ years delivering secure, scalable platforms from front-end to back-end. I specialize in React, Angular, .NET, and Django, with PostgreSQL, Redis, and cloud-native deployments on AWS and Azure. I’ve led enterprise CI/CD pipelines and ensured compliance across healthcare, fintech, and AI initiatives, empowering teams to ship reliable software. When tech throws a curveball, I sip my coffee and prepare for a showdown with the code—collaborating with designers, product managers, and stakeholders to deliver mission-critical AI features on accelerated timelines. I’m passionate about mentoring teams, improving performance, and strengthening security in complex environments.…Hi, I’m Oscar Garcia, a senior full-stack engineer with 10+ years delivering secure, scalable platforms from front-end to back-end. I specialize in React, Angular, .NET, and Django, with PostgreSQL, Redis, and cloud-native deployments on AWS and Azure. I’ve led enterprise CI/CD pipelines and ensured compliance across healthcare, fintech, and AI initiatives, empowering teams to ship reliable software. When tech throws a curveball, I sip my coffee and prepare for a showdown with the code—collaborating with designers, product managers, and stakeholders to deliver mission-critical AI features on accelerated timelines. I’m passionate about mentoring teams, improving performance, and strengthening security in complex environments.

Available to hire

Hi, I’m Oscar Garcia, a senior full-stack engineer with 10+ years delivering secure, scalable platforms from front-end to back-end. I specialize in React, Angular, .NET, and Django, with PostgreSQL, Redis, and cloud-native deployments on AWS and Azure. I’ve led enterprise CI/CD pipelines and ensured compliance across healthcare, fintech, and AI initiatives, empowering teams to ship reliable software.

When tech throws a curveball, I sip my coffee and prepare for a showdown with the code—collaborating with designers, product managers, and stakeholders to deliver mission-critical AI features on accelerated timelines. I’m passionate about mentoring teams, improving performance, and strengthening security in complex environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Javanese

Fluent

English

Fluent

Work Experience

Software Engineer at Cognizant

July 1, 2025 - September 4, 2025

Led development of a healthcare claims adjudication platform by decomposing a legacy system into Spring Boot 3.x and Kotlin microservices deployed on Azure Kubernetes Service (AKS). Designed real-time payment validation pipelines using Apache Kafka and Kafka Streams, integrating fraud-detection models to reduce financial fraud exposure by 22%. Introduced Kotlin coroutines to improve service throughput and reduce latency by 25%, enabling faster onboarding. Migrated core financial services to Spring Boot while maintaining backward compatibility with .NET Core integrations, cutting request-response times by 35%. Implemented HIPAA-compliant interoperability adapters with HL7 and FHIR standards for secure EHR data exchange. Architected claims reconciliation engine automating nightly settlements, reducing failed reconciliations by 40%. Delivered interactive fraud detection dashboards using React and Redux, improving investigation times by 50%. Designed patient payment systems integrating ACH

Senior Software Developer at Tapcheck

January 1, 2021 - September 4, 2025

Engineered real-time payroll disbursement microservices using Java (Spring Boot 2.x) and Kotlin processing thousands of wage-advance requests daily with event-driven Kafka pipelines, ensuring low-latency payouts. Developed payment authorization workflows integrated with ACH, Visa, Mastercard, and regional banking APIs with Spring Security, OAuth 2, and PCI-DSS standards, reducing chargebacks by 18%. Built payroll synchronization services in Kotlin with PostgreSQL and DynamoDB handling millisecond-level lookups for employee wage eligibility, improving payout accuracy by 30% and reducing discrepancies. Modernized core payout APIs by migrating legacy synchronous .NET components to asynchronous Java gRPC services, decreasing latency by 25%. Designed fraud detection pipelines with Kafka and AWS SageMaker to analyze streaming payroll data in near real time, flagging suspicious transactions under 5 seconds preventing major losses. Implemented bank reconciliation services matching ACH and sett

Full Stack Developer at SalusO

November 1, 2018 - September 4, 2025

Developed core patient wellness platform using Java (Spring Boot) and Kotlin services for health record storage, appointment scheduling, and billing workflows emphasizing HIPAA compliance with strict audit logging, data encryption, and role-based access controls. Designed React and Redux patient engagement portals providing dashboards for health metrics and appointment management, introducing component reusability and lazy loading which cut front-end bundle sizes by 30% improving load times. Implemented secure real-time communications with Node.js and WebSockets enabling patients to message providers and receive instant notifications reducing missed follow-ups by 25%. Created Spring Boot APIs for insurance claims submission and verification integrating third-party clearinghouses with retry logic and circuit breakers using Resilience4j, reducing claim rejection rates by 15% for smaller practices. Collaborated with clinicians and product owners to capture requirements and translate clini

Software Developer Intern at SalusO

December 1, 2015 - September 4, 2025

Assisted in developing Java (Spring MVC) web applications implementing CRUD modules for internal HR and payroll systems gaining foundational experience in MVC architecture and Hibernate ORM. Contributed front-end updates with JavaScript, jQuery, and Bootstrap enhancing usability of employee self-service portals improving page responsiveness and accessibility by applying mobile-first principles. Built SQL queries and stored procedures in MySQL supporting reporting features, acquiring skills in debugging query performance and validating data accuracy for HR audits. Created unit tests with JUnit and Mockito to validate service layer functionality introducing testing coverage for modules previously lacking it. Shadowed senior engineers in Agile stand-ups and sprint planning gaining practical exposure to real-world Scrum workflows and Jira backlog management. Documented application modules, REST API endpoints, and onboarding guides for future interns reducing ramp-up time for subsequent hir

Software Engineer at Cognizant

July 1, 2025 - September 4, 2025

Led development of a healthcare claims adjudication platform by decomposing legacy systems into Spring Boot 3.x and Kotlin microservices deployed on Azure Kubernetes Service (AKS). Designed real-time payment validation pipelines with Apache Kafka and Kafka Streams, integrating fraud-detection models to instantaneously flag suspicious claims, reducing financial fraud exposure by 22%. Introduced Kotlin coroutines for high-throughput services, cutting latency and simplifying asynchronous logic by 25%. Migrated core financial services from ASP.NET Web API to Spring Boot with gRPC inter-service calls, improving response times by 35% and securing cross-platform transactions. Implemented HIPAA-compliant interoperability with HL7 and FHIR standards, enhancing patient record synchronization across partners. Architected claims reconciliation engine using Spring Batch and PostgreSQL, automating nightly settlement processes and reducing failed reconciliations by 40%. Built fraud detection dashboar

Senior Software Developer at Tapcheck

January 1, 2021 - September 4, 2025

Engineered real-time payroll disbursement microservices using Java (Spring Boot 2.x) and Kotlin processing thousands of wage-advance requests daily via event-driven Kafka pipelines ensuring low latency. Developed payment authorization workflows integrating ACH, Visa, Mastercard, and regional banking APIs with Spring Security, OAuth 2, and PCI-DSS encryption reducing chargeback incidents by 18%. Built payroll synchronization services in Kotlin with PostgreSQL and DynamoDB handling millisecond-level lookups, improving payout accuracy by 30%. Modernized core payout APIs migrating legacy synchronous .NET components to asynchronous Java gRPC services, reducing processing latency by 25%. Designed fraud detection pipeline combining Kafka with AWS SageMaker streaming payroll and payment data to flag suspicious transactions under 5 seconds, preventing major losses. Implemented bank reconciliation services in Spring Boot matching ACH and settlement records with optimized PostgreSQL queries reduc

Full Stack Developer at SalusO

November 1, 2018 - September 4, 2025

Developed core patient wellness platform using Java (Spring Boot) and Kotlin services for health record storage, appointment scheduling, and billing workflows prioritizing HIPAA compliance with strict audit logging, data encryption, and role-based access controls reducing manual paperwork by 60%. Designed patient engagement portal with React and Redux providing dashboards for health metrics, care plans, and appointment management using component reusability and lazy loading decreasing front-end bundle sizes by 30%. Implemented secure real-time communication features with Node.js and WebSockets enabling patients to message providers and receive instant notifications about prescription updates or lab results improving patient response times and reducing missed follow-ups by 25%. Built Spring Boot APIs for insurance claim submission and verification integrating third-party clearinghouses including retry logic with circuit breakers using Resilience4j reducing claim rejection rates by 15% f

Software Developer Intern at SalusO

December 1, 2015 - September 4, 2025

Assisted in development of Java (Spring MVC) web applications implementing CRUD modules for internal HR and payroll systems learning MVC architecture and Hibernate ORM for persistence. Contributed to front-end updates with JavaScript, jQuery, and Bootstrap enhancing usability and applying mobile-first principles. Built SQL queries and stored procedures in MySQL supporting reporting features gaining experience debugging query performance and validating data accuracy. Created unit tests with JUnit and Mockito introducing testing coverage for modules that previously lacked it. Shadowed senior engineers in Agile stand ups and sprint planning gaining practical exposure to Scrum workflows and Jira backlog management. Documented application modules, REST API endpoints, and onboarding guides reducing ramp-up time for future interns and junior developers by 20%.

Software Engineer at Cognizant

July 31, 2025 - September 4, 2025

Led development of a healthcare claims adjudication platform by decomposing a legacy system into Spring Boot 3.x and Kotlin microservices deployed on Azure Kubernetes Service. Designed real-time payment validation pipelines with Apache Kafka and Kafka Streams that integrated fraud-detection models, reducing financial fraud exposure by 22%. Introduced Kotlin coroutines to high-throughput services, improving latency and simplifying asynchronous logic by 25%. Migrated core financial services from ASP.NET Web API to Spring Boot, building gRPC adapters for secure cross-platform calls, cutting response times by 35%. Implemented HIPAA-compliant interoperability adapters in Spring Boot for EHR data exchange, enhancing patient record synchronization and compliance. Architected a claims reconciliation engine that automated nightly settlement processes, reducing failed reconciliations by 40%. Built fraud detection dashboards using React and Redux, consuming Kafka event streams and reducing invest

Senior Software Developer at Tapcheck

January 1, 2021 - September 4, 2025

Engineered real-time payroll disbursement microservices in Java (Spring Boot 2.x) and Kotlin processing thousands of wage-advance requests daily. Designed event-driven Kafka pipelines to ensure low-latency payouts during peak monthly demand spikes. Developed payment authorization workflows integrating ACH, Visa, Mastercard, and regional banking APIs with Spring Security OAuth 2.0 and PCI-DSS encryption standards, reducing chargeback incidents by 18%. Built payroll synchronization services in Kotlin with PostgreSQL and DynamoDB, improving payout accuracy by 30% and reducing discrepancies. Modernized core payout APIs by migrating legacy synchronous .NET components to asynchronous Java gRPC services, reducing processing latency by 25%. Designed fraud detection pipeline with Kafka and AWS SageMaker analyzing streaming payroll and payment data, flagging high-risk transactions under 5 seconds to prevent financial losses. Implemented bank reconciliation services in Spring Boot matching ACH an

Full Stack Developer at SalusO

November 1, 2018 - September 4, 2025

Developed core patient wellness platform using Java (Spring Boot) and Kotlin services for health record storage, appointment scheduling, and billing workflows prioritizing HIPAA compliance with strict audit logging, data encryption, and role-based access controls. Designed patient engagement portal with React and Redux featuring health dashboards, care plans, and appointment management, introducing component reusability and lazy loading to reduce frontend bundle sizes by 30%. Implemented secure real-time communications with Node.js and Web Sockets allowing patients to message providers and receive instant notifications on prescription updates and lab results, improving patient response times and reducing missed follow-ups by 25%. Built Spring Boot APIs for insurance claim submission and verification integrating with third-party clearinghouses with retry logic and circuit breakers using Resilience4j, reducing claim rejection rates by 15% for small practices lacking automation. Collabora

Software Developer Intern at SalusO

December 1, 2015 - September 4, 2025

Assisted in development of Java (Spring MVC) web applications implementing CRUD modules for internal HR and payroll systems while learning MVC architecture and Hibernate ORM for persistence in enterprise systems. Contributed to front-end updates with JavaScript, jQuery, and Bootstrap enhancing usability of employee self-service portals improving page responsiveness and accessibility with mobile-first principles. Built SQL queries and stored procedures in MySQL to support reporting features, gaining experience debugging query performance and validating data accuracy for HR audits. Created unit tests with JUnit and Mockito validating service-layer functionality, introducing test coverage to previously untested modules. Shadowed senior engineers in Agile stand-ups and sprint planning gaining practical exposure to Scrum workflow and Jira for backlog management. Documented application modules, REST API endpoints, and onboarding guides for future interns and junior developers reducing ramp-u

Software Engineer at Cognizant

July 1, 2025 - September 26, 2025

Developed and maintained the Neuro AI platform using .NET on the backend and Angular on the frontend, ensuring responsive design, enterprise-grade scalability, and cross-device stability for decision intelligence workflows. Integrated a hybrid CMS setup using Drupal and Strapi Router to streamline AI insights delivery and enhance content workflows for enterprise users and stakeholders. Built secure RESTful APIs with role-based authentication, reducing access-related issues and strengthening compliance with security standards. Optimized Angular components with lazy loading to reduce initial load times and improve responsiveness for enterprise users. Collaborated with designers, product managers, and stakeholders to deliver mission-critical AI features on accelerated timelines, aligning with Cognizant’s digital transformation goals. Deployed the Neuro AI platform using Docker and implemented CI/CD pipelines, streamlining staging and production workflows while ensuring reliable, repeata

Senior Software Developer at Tapcheck

January 1, 2021 - September 26, 2025

Led development of a modern earned wage access platform using React on the frontend and Python/Django on the backend, focusing on responsive UIs and clean API architecture for employees and HR/admin dashboards. Built and maintained scalable REST APIs with Django Rest Framework (DRF) to handle wage requests, transaction histories, and secure disbursements, with versioning, filtering, and role-based permissions built in. Integrated external payroll and HR systems via APIs and file-based adapters, normalizing structured data into Django models while implementing retries, audit trails, and compliance logging. Owned key infrastructure components like RBAC, custom authentication middleware, and token/session management, using Django + Redis to ensure secure and low-latency user access. Implemented background processing with Celery and RabbitMQ for long-running tasks such as wage settlement, batch payroll reconciliation, and transaction reporting. Designed and optimized PostgreSQL schemas via

Full Stack Developer at SalusO

January 1, 2018 - September 26, 2025

Joined as the first engineer at SalusO, defined the core stack (Python, C# for back ends, React for frontend), and built the foundation for a secure, scalable health data platform. Developed HIPAA-compliant APIs with Flask/FastAPI and .NET Core, powering patient, provider, and administrator workflows across the platform. Automated ETL pipelines in Python (Pandas, SQLAlchemy), streamlining health and wellness data ingestion and reducing reporting delays by 35%. Integrated and modernized legacy C# systems, unifying them with new Python microservices to deliver a single secure and consistent experience. Migrated services to Azure Kubernetes Service (AKS), improving reliability and scalability, and raising uptime from 96% to 99.9%. Collaborated with leadership, clinicians, and researchers to shape the product roadmap, scaling SalusO from prototype to production-ready deployment.

Software Developer Intern at SalusO

December 1, 2015 - September 26, 2025

Contributed to SalusO’s platform development using React, HTML5, CSS3, and modern JavaScript, ensuring responsive layouts across devices and improving accessibility for patients and clinicians. Assisted in backend feature development by implementing Flask/FastAPI endpoints and .NET Core APIs for user authentication, scheduling, and health record management, accelerating deliverables under senior developer guidance. Gained hands-on experience with relational database design by creating and optimizing PostgreSQL schemas, writing queries for reporting dashboards, and supporting QA in validating data integrity during clinical and administrative workflows.

Senior Software Engineer at Cognizant

July 1, 2025 - September 26, 2025

Developed and maintained the Neuro AI platform using .NET on the backend and Angular on the frontend, ensuring responsive design, enterprise-scale scalability, and cross-device stability for decision-intelligence workflows. Integrated a hybrid CMS (Drupal + Strapi Router) to streamline AI insights delivery and improve content workflows for enterprise users. Built secure RESTful APIs with role-based authentication, reducing access-related issues by 40% and strengthening compliance with enterprise security standards. Optimized Angular components with lazy loading, reducing initial load times by 30%. Deployed the Neuro AI platform using Docker and implemented CI/CD pipelines, enabling reliable staging and production releases. Collaborated with designers, product managers, and stakeholders to deliver mission-critical AI features within accelerated timelines.

Senior Software Developer at Tapcheck

January 1, 2021 - September 26, 2025

Led development of a modern earned wage access platform using React on the frontend and Python/Django on the backend, focusing on responsive UIs and clean API architecture for employees and HR/admin dashboards. Built scalable REST APIs with Django REST Framework to handle wage requests, transaction histories, and secure disbursements, with versioning, filtering, and role-based permissions. Integrated external payroll and HR systems via APIs and adapters, normalizing structured data into Django models while implementing retries, audit trails, and compliance logging. Owned key infrastructure components like RBAC, custom authentication middleware, and token/session management (Django + Redis) to ensure secure and low-latency user access. Implemented background processing with Celery and RabbitMQ for long-running tasks. Designed and optimized PostgreSQL schemas via Django ORM, indexing high-volume queries to keep payout and reporting operations performant under heavy load. Deployed service

Full Stack Developer at SalusO

January 1, 2018 - September 26, 2025

Software Developer Intern at SalusO

December 1, 2015 - September 26, 2025

Contributed to SalusO’s platform development using React, HTML5, CSS3, and modern JavaScript, ensuring responsive layouts across devices and improving accessibility for patients and clinicians. Assisted in backend feature development by implementing Flask/FastAPI endpoints and .NET Core APIs for user authentication, scheduling, and health record management. Gained hands-on experience with relational database design by creating and optimizing PostgreSQL schemas, writing queries for reporting dashboards, and supporting QA in validating data integrity during clinical and administrative workflows.