Available to hire
I’m Christopher Rijos, a results-driven, bilingual (Spanish/English) Lead Software Engineer with 10+ years of experience designing and delivering high-impact, scalable, and secure systems across fintech, SaaS, and global enterprise platforms.
I excel at cloud-native architecture, microservices, real-time systems, and event-driven workflows. I enjoy leading cross-functional teams, mentoring engineers, driving innovation, and ensuring compliance in regulated industries.
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Language
English
Fluent
Spanish; Castilian
Fluent
Work Experience
Staff Software Engineer at Ahold Delhaize
January 1, 2025 - PresentModernized legacy systems by implementing GraphQL Federation across multiple brands, consolidating 15+ microservices into a unified graph while collaborating with cross-functional teams. Designed and implemented a GraphQL Federation gateway using TypeScript/Node.js, resulting in a 40% reduction in API response times. Developed schema stitching strategies for legacy REST services integration and established GraphQL security best practices. Built a React-based internal developer portal and integrated cloud-native infrastructure using Docker, Kubernetes, and AWS services to support continuous delivery and scalable development.
Senior Fullstack Web Application Engineer IV at Ally Bank
January 31, 2025 - July 27, 2025Architected and implemented event-driven microservices using AWS EventBridge, SQS, and Lambda to support mission-critical features. Developed TypeScript APIs with AWS API Gateway aligned with best practices. Implemented serverless architecture using AWS CDK and AWS Step Functions for complex event-driven workflows. Built and maintained CI/CD pipelines with GitHub Actions and developed real-time data processing features using DynamoDB, SQS FIFO queues, and GraphQL integration.
Senior Lead Software Engineer at STAY AI
February 28, 2024 - July 27, 2025Led a team to develop an AI feature for a Shopify app platform, promoting collaboration between product, design, and technical teams. Designed scalable microservices architecture using AWS services. Integrated multiple service layers using AWS EventBridge and SQS. Developed API solutions with TypeScript and Node.js, and established automated deployment pipelines with GitHub Actions and AWS CDK. Created custom API endpoints for third-party service integrations to enhance platform interoperability and user experience.
Senior Software Engineer at KODEX INC
September 30, 2023 - July 27, 2025Led development of a critical data bridge between FBI, CIA, and NSA systems with secure event-driven solutions for intelligence sharing. Designed real-time event orchestration for time-sensitive data and implemented Apollo Federation for a secure gateway meeting federal compliance. Collaborated with teams from Meta and federal agencies, authored RFC proposals, and mentored on secure development.
Senior Software Engineer at Spruce Holdings Inc.
September 30, 2022 - July 27, 2025Architected a cloud-native mortgage affidavit processing system with microservices supporting scalable document generation. Designed a rules engine and dynamic template system for county-specific legal requirements. Implemented event-driven workflows using Google Cloud EventBridge and developed a scalable data processing pipeline with automated quality controls. Led hybrid cloud architecture strategy involving GCP and AWS and mentored engineering teams while conducting code reviews.
Senior Software Engineer at XOJET
February 28, 2021 - July 27, 2025Designed aircraft asset management platform with scalable Node.js/Express microservices. Developed personnel tracking and logistics coordination systems via real-time data processing. Implemented distributed microservices architecture with Redis and SQS, ensured continuous testing. Built features across Angular.js applications and engineered real-time data visualization dashboards to support aviation operations.
Senior Software Engineer at Reix Corporation
January 31, 2020 - July 27, 2025Founded and led technical vision for South America's leading real estate platform, capturing 90% market share. Architected Node.js/Express microservices and serverless architectures. Developed custom analytics dashboard with GraphQL APIs and AppSync, implemented real-time websocket communications and multi-region infrastructure. Mentored developers and led code reviews.
Fullstack Software Engineer at THRST
December 31, 2017 - July 27, 2025Pioneered initial technical architecture for live hospitality platform. Architected scalable infrastructure with Node.js/Express microservices and MongoDB. Engineered real-time order processing and payment status updates with WebSocket. Achieved PCI LEVEL 3 certification via secure payment gateways and compliance measures. Developed responsive POS interfaces using Angular and Ionic. Integrated automated testing and CI/CD pipelines.
Fullstack Software Engineer at Building Energy Sciences
December 31, 2016 - July 27, 2025Led global installation monitoring and HVAC system integration with real-time data synchronization and secure backend performance. Collaborated with government officials on MIL-STD-810G & DOD compliance translating regulatory requirements into technical specs. Developed optimized microservices with Node.js and Golang, implemented AngularJS monitoring dashboards, and managed stakeholder meetings and security documentation.
Senior Software Engineer / SWE Intelligence Analyst / Coding Expert at Mercor
July 1, 2025 - November 3, 2025Evaluated and trained frontier AI models on complex coding challenges for top AI labs including OpenAI, Anthropic, and Google DeepMind. Designed high-difficulty coding evaluations across algorithms, system design, and software engineering problems; created expert-level training data and benchmarks; performed rigorous quality assessments of AI-generated code outputs; collaborated with AI research teams to identify model weaknesses and provide targeted feedback for capability improvements; developed evaluation criteria to measure AI performance on economically valuable software engineering tasks.
Senior Frontend Engineer (contractor) at Bilt Rewards
July 1, 2025 - November 3, 2025Led the development and launch of Bilt's integrated fitness platform, enabling members to book classes from 8+ fitness partners via the Bilt app. Architected seamless frontend experiences using React/React Native for class booking, points earning, and redemption; implemented real-time class availability, confirmations, and post-class reward workflows; optimized mobile-first UX and integrated with payments and loyalty systems; defined API contracts for multi-partner fitness integrations.
Senior Backend Software Engineer (contractor) at Ahold Delhaize
July 1, 2025 - July 1, 2025Led modernization of legacy systems by consolidating 15+ microservices into a GraphQL federation; implemented Apollo Federation with TypeScript/Node.js and modular subgraphs; built a React-based developer portal for schema exploration; established GraphQL security practices including rate limiting and cost analysis; integrated cloud-native infrastructure using Docker, Kubernetes, and AWS ECS; standardized schema design; mentored 8 engineers on GraphQL best practices; implemented end-to-end testing workflows.
Senior Lead Fullstack Web Application Engineer (contractor) at Ally Bank
January 1, 2025 - January 1, 2025Designed and implemented event-driven microservices using AWS EventBridge, SQS, Kafka, and Lambda; developed robust TypeScript APIs with AWS API Gateway and serverless architecture using CDK; orchestrated workflows with AWS Step Functions and SQS FIFO queues; replaced an external messaging system with an in-house solution saving $2M annually and reducing latency by 40%; achieved 99.99% message delivery reliability; improved test coverage to 70%+ for GraphQL APIs and React components; implemented end-to-end testing workflows with Playwright.
Senior Lead Software Engineer (contractor) at STAY AI
February 1, 2024 - February 1, 2024Led development of a scalable microservices architecture for a Shopify app platform; designed and implemented robust APIs with TypeScript/Node.js and automated deployment pipelines with GitHub Actions; contributed to Python data pipelines for customer retention models; orchestrated integrations with AWS EventBridge and SQS, optimizing DynamoDB for high-volume e-commerce transactions; delivered features ahead of schedule and leveraged large language model SDKs to create personalized customer retention systems.
Senior Software Engineer at XOJet
February 1, 2021 - February 1, 2021Designed and built a comprehensive aircraft asset management platform with scalable Node.js/Express microservices, Ionic, React, Angular, and Java Spring Boot; built personnel tracking and logistics coordination systems; implemented real-time flight operations monitoring and data visualization dashboards; created high-throughput data processing pipelines for aviation analytics; established distributed microservice architecture and robust producer/consumer architectures; implemented Redis/SQS for large data processing and caching; developed frontend mobile apps for operations use.
Senior Software Engineer at Reix Corporation
January 1, 2020 - January 1, 2020Founded South America’s leading real estate platform, capturing ~90% market share in commercial real estate; established the ‘Zillow of South America’ brand; architected serverless microservices with real-time WebSocket communications; enabled multi-region international market expansion; built scalable data processing pipelines for property analytics; deployed AppSync GraphQL, DynamoDB, SQS/SNS, Lambda; implemented Angular with Nginx for deployment; created CI/CD pipelines and data security measures; supported 3,000+ county variations in automated document generation.
Fullstack Software Engineer at THRST
December 1, 2017 - December 1, 2017Pioneered the technical architecture of a live hospitality platform; engineered enterprise-level POS solutions with real-time payment processing; achieved PCI Level 3 certification by implementing secure payment gateways; redesigned hospitality operations with WebSocket-based real-time communications; designed a bidirectional WebSocket protocol; implemented Socket.IO in frontend for mobile interfaces; built high-throughput messaging with load-balanced WebSocket clusters; developed Angular/ Ionic frontend and Node.js/Express microservices with MongoDB and Redis/SQS.
Fullstack Software Engineer at Building Energy Sciences
December 1, 2016 - December 1, 2016Led cloud-native (hybrid) architecture and building management solutions; integrated HVAC systems with MIL-STD-810G and DoD standards; developed enterprise building management systems for military installations; implemented energy efficiency monitoring and optimization; created dynamic document generation supporting 3,000+ county variations; established automated quality checks and scalable document processing pipelines; mentored teams and supported multi-cloud deployments (GCP/AWS).
Senior Frontend Engineer at Bilt Rewards
July 1, 2025 - November 3, 2025Led development and launch of Bilt's integrated fitness class booking and rewards platform; implemented frontend with React/React Native, including a seamless booking flow, points earning, and post-class reward delivery; integrated multi-partner workflows and real-time availability.
Senior Backend Software Engineer at Ahold Delhaize
July 1, 2025 - July 1, 2025Led modernization of legacy systems with GraphQL Federation, consolidating 15+ microservices into a unified GraphQL graph; implemented Apollo Federation, designed schema, and established security practices; built a React-based developer portal and cloud infrastructure integration.
Senior Lead Fullstack Web Application Engineer at Ally Bank
January 1, 2025 - January 1, 2025Designed and implemented event-driven microservices using AWS EventBridge, SQS, Kafka; developed robust TypeScript APIs with API Gateway and serverless architecture; migrated to in-house messaging and processing, saving costs and improving latency; achieved 99.9%+ message delivery reliability.
Senior Lead Software Engineer at STAY AI
February 1, 2024 - February 1, 2024Led development of a scalable microservices architecture for a Shopify-based platform; designed and implemented robust APIs with TypeScript/Node.js and automated deployments via GitHub Actions; integrated AWS EventBridge and SQS for real-time ordering and customer retention workflows.
Senior Software Engineer at Spruce Holdings Inc.
September 1, 2022 - September 1, 2022Architected cloud-native mortgage processing systems; implemented event-driven workflows and real-time document handling across 3,000+ county variations; established secure deployment pipelines and schema standards; mentored a team of engineers.
Senior Frontend Engineer at Bilt Rewards
July 1, 2025 - November 5, 2025Led development and launch of Bilt's integrated fitness platform, enabling members to book classes from 8+ fitness partners directly through the Bilt app. Architected a seamless frontend experience using React/React Native for class booking, point earning (up to 10 points per dollar), and redemption workflows. Implemented real-time class availability, booking confirmations, and post-class reward delivery, with a mobile-first interface and integrated payment flows. Collaborated with product and backend teams to establish API contracts for multi-partner integrations and real-time availability synchronization.
Senior Software Engineer / SWE Intelligence Analyst / Coding Expert at Mercor
July 1, 2025 - November 5, 2025Evaluated and trained frontend AI models for top AI labs including OpenAI, Anthropic, Google DeepMind. Designed high-difficulty coding evaluation tasks, built training data and benchmarks, and contributed to next-generation AI systems. Conducted rigorous quality assessments of AI-generated code for accuracy, efficiency, and alignment with professional software engineering standards. Collaborated with AI research teams to identify model weaknesses and provide targeted feedback for capability improvements in coding tasks.
Senior Lead Fullstack Web Application Engineer at Ally Bank
January 31, 2025 - January 31, 2025Designed and implemented event-driven microservices using AWS EventBridge, SQS, Kafka. Developed robust TypeScript APIs with AWS API Gateway and serverless architecture using CDK. Orchestrated workflows with AWS Step Functions and real-time processing with SQS FIFOs. Replaced a vendor messaging system with an in-house solution, saving $2M annually and reducing latency by 40%. Achieved 99.99% message delivery reliability with a Genysis Call Queue using SQS and DLQ patterns. Improved test coverage to 70%+ for GraphQL APIs and React components and implemented end-to-end testing workflows using Playwright.
Senior Lead Software Engineer at STAY AI
February 28, 2024 - February 28, 2024Led development of a scalable microservices architecture for a Shopify app platform. Designed and implemented robust TypeScript APIs with TypeScript/Node.js and automated deployment pipelines with GitHub Actions. Jumped in on Python data pipelines for customer retention models. Orchestrated integrations with AWS EventBridge and SQS, optimizing DynamoDB for high-volume e-commerce transactions. Delivered features ahead of schedule, reducing manual Shopify processes and leveraging AI capabilities via large language model SDKs to create personalized customer retention systems.
Senior Software Engineer at Spruce Holdings Inc.
September 30, 2022 - September 30, 2022Architected cloud-native architecture (GCP/AWS). Mentored a team of 8 engineers on GraphQL best practices. Implemented end-to-end testing workflows using Playwright, ensuring robust and reliable application performance. Built a React-based developer portal for schema exploration, enhancing collaboration across teams. Established GraphQL security best practices, including rate limiting and cost analysis. Integrated cloud-native infrastructure using Docker, Kubernetes, and AWS ECS. Managed standardized schema design.
Fullstack Software Engineer at Building Energies
December 1, 2016 - December 1, 2016Led cloud-native architecture for energy solutions at Naval Air Station Pensacola. Built enterprise-grade building management systems and IoT integrations, including an event-driven workflow engine for site-wide operations. Implemented dynamic document generation supporting 3,000+ county variations and automated quality checks for generated documents. Built a scalable CI/CD pipeline and established development standards.
Education
Computer Science at University of West Florida
August 1, 2012 - December 31, 2016Bachelor of Science in Computer Science at University of West Florida
August 1, 2012 - December 1, 2016Bachelor of Science at University of West Florida
August 1, 2012 - December 1, 2016Bachelor of Science in Computer Science at University of West Florida
August 1, 2012 - December 1, 2016Qualifications
PCI Level 3 Certification
January 1, 2016 - November 3, 2025PCI Level 3 Certification (Payment Card Industry)
January 11, 2030 - November 3, 2025PCI Level 3 Certification
January 1, 2016 - November 5, 2025Industry Experience
Software & Internet, Financial Services, Government, Real Estate & Construction, Transportation & Logistics, Travel & Hospitality, Professional Services, Media & Entertainment, Retail
Skills
Experience Level
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
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