Profile
Hello, I'm
Ángel Lillo
Backend Engineer · Serverless · APIs · Integrations
This portfolio brings together my professional experience, technical projects, and way of working as a Backend Engineer, focused on APIs, integrations, serverless, and data flows, complemented by frontend and mobile experience when the project requires it.
I design and develop backend solutions focused on integration, operations, and maintainability, especially in AWS serverless environments.
Chile · Remote work
Backend and APIsAWS/serverless/integrationsData/operations/reliability
Technical ownership focused on clarity, resilience, and real-world operations
Computer Engineer specialized in backend development with Node.js and AWS serverless architecture for high-criticality production projects. I contribute across technical design, implementation, production support, and enterprise integrations with systems such as SAP and AS400. I complement this core experience with Flutter, AWS data components, and practical AI usage applied to software development.
Responsible for
Technical design, implementation, and production operations across backend and AWS environments.
Specialization
Serverless architecture, enterprise integration, data platforms, and continuous improvement.
Technologies
Core
Node.jsAWS LambdaAWS Step FunctionsAmazon SQSDynamoDBServerless ArchitectureEvent-Driven DesignSAPAS400
Complementary
C#S3AWS GlueAthenaPostgreSQLOracle (SQL / PL-SQL)AngularFlutterDjangoDockerGitLinux / ZshSonarQubeAI applied to developmentTechnical promptingAI-assisted automation
Strengths
Areas with demonstrated production impact
- Resolution of critical production incidents
- Complex workflow design with AWS Step Functions
- Advanced DynamoDB modeling and inconsistency remediation
- Enterprise integration with SAP and AS400 systems
- Practical AI usage for technical analysis and assisted automation
04
Experience
Responsibilities and work context
COPEC FFAA
Critical information management system in a high-demand production environment.
Responsible for
- Backend development with Node.js in a serverless architecture.
- Process orchestration with AWS Step Functions.
- AWS Lambda implementation with error handling and retries.
- Integration with SAP and AS400 for enterprise workflows.
- Resilience using SQS + DLQ for decoupling and failure recovery.
- DynamoDB data modeling and inconsistency remediation.
- Contribution to QA, estimations, and code quality improvements.
Participation and impact
- Direct involvement in resolving critical production incidents.
- Contribution to backend workflow reliability and maintainability.
- Cross-functional contribution to QA, estimations, and technical design.
Relevant stack
Node.jsAWS LambdaStep FunctionsSQS / DLQDynamoDBSAPAS400SonarQube
RVA (Red Virtual de Alimentos)
Mobile application connected to APIs to support functional user flows.
Responsible for
- Mobile frontend development with Flutter.
- REST API integration.
- Implementation of functional interfaces and user flows.
Participation and impact
- Contribution to the functional implementation of the mobile application.
- Hands-on experience integrating client applications with backend APIs.
Relevant stack
FlutterDartREST APIs
Data Warehouse Subproject
Implementation of AWS data analytics components for data availability and querying.
Responsible for
- Data architecture design.
- ETL implementation with AWS Glue.
- Crawler and data catalog configuration.
- Analytical querying with Athena.
- Resolution of data visualization and availability issues.
Participation and impact
- Contribution to enabling data flows for analytics.
- Support for data availability and querying in AWS environments.
Relevant stack
AWS GlueAthenaS3ETLData Catalog
Focus
Areas where I currently add the most value
- Scalable software architecture
- Distributed systems
- Advanced serverless in AWS
- Enterprise integrations and production operations
- Software quality and QA process maturity
- Practical AI usage in software development
Contact
Direct channels
Let's talk
Available channels to connect or coordinate
const developer = { name: 'Ángel Lillo', focus: 'Backend Engineer · Serverless · APIs · Integrations', location: 'Chile · Remote work', approach: 'Responsible for design, implementation, and operations' };