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Jack Guerrero

Cloud & DevSecOps Engineer

I build secure, scalable and observable cloud platforms for production systems, combining software engineering, AWS infrastructure, microservices, Kubernetes, Terraform, CI/CD and fintech/payment experience.

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AWSKubernetesTerraformCI/CDMicroservicesPaymentsSecurityObservability
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Jack Guerrero
production_cloud.yml

AWS workloads, microservices and platform decisions built for production reliability.

aws.services: lambda + eventbridge + sqsarchitecture: microservices + eventsruntime: kubernetes + containerspriority: secure, scalable, maintainable
01

From software engineering to reliable cloud platforms.

I started in software engineering, working across frontend and backend systems. Over time, my work moved closer to cloud infrastructure, DevOps, secure integrations, observability and production reliability.

That background helps me understand both the application layer and the platform where it runs. Today I focus on building and improving secure, scalable, observable and maintainable cloud systems, especially in fintech and payment environments where reliability and operational discipline matter.

02

Core Expertise

Areas where I connect software engineering, cloud operations, security and transactional production environments.

AWS Cloud Infrastructure

Designing and improving cloud workloads with a focus on security, scalability, reliability and maintainability.

Microservices & Distributed Systems

Building and supporting backend services, event-driven flows and transactional systems designed for production environments.

Kubernetes & Containers

Working with containerized workloads and platform practices that help teams deploy and operate services consistently.

Terraform & Infrastructure as Code

Using IaC to provision, version and evolve infrastructure in a controlled, repeatable and maintainable way.

DevOps & CI/CD

Improving delivery workflows through automation, pipelines and engineering practices that reduce friction between development and production.

Serverless & Lambda Optimization

Working with AWS Lambda workloads, concurrency configuration, cold start reduction strategies and production reliability improvements.

Observability & Grafana

Creating dashboards, alerts, traces and operational signals that help teams understand systems before failures become visible.

Security, mTLS & Certificates

Supporting secure communication, certificate renewal, mTLS integrations and controlled security practices in transactional environments.

Fintech & Payment Infrastructure

Working close to POS, miniPOS, payment flows, cryptographic processes, PCI-related environments and reliable payment systems.

03

Selected Work

Public-safe case studies written without exposing internal data, provider details or sensitive security information.

AWS Microservices for Payment Systems

AWS / Payments
  • Problem: Payment-related workloads require reliable, secure and maintainable backend architecture.
  • Action: Worked on transactional architecture using AWS services, microservices, event-driven patterns, SOLID principles and idempotency.
  • Technical impact: Supported payment flows with better maintainability, reliability and operational clarity.
AWS LambdaEventBridgeDynamoDBSQSS3PostgreSQL RDSPaymentCryptographyMicroservices

Kubernetes, Terraform & CI/CD Platform Practices

Platform
  • Problem: Cloud teams need consistent infrastructure, repeatable deployments and better delivery practices.
  • Action: Worked with platform practices involving Kubernetes, Terraform, CI/CD and infrastructure automation.
  • Technical impact: Improved consistency, delivery confidence and operational maintainability across cloud environments.
KubernetesTerraformCI/CDDockerCloud Infrastructure

Lambda Performance & Serverless Reliability

AWS / Serverless
  • Problem: Some serverless workloads needed better response times, concurrency behavior and lower cold start impact.
  • Action: Worked on concurrency configuration, dependency review and cold start reduction strategies.
  • Technical impact: Improved reliability and response time behavior for Lambda-based workloads.
AWS LambdaServerlessConcurrencyPerformance Optimization

Observability, Grafana Dashboards & Alerts

Observability
  • Problem: Teams needed better operational visibility and faster incident detection.
  • Action: Created Grafana dashboards, alerts and useful operational signals for production systems.
  • Technical impact: Improved incident detection, system understanding and production support.
GrafanaObservabilityAlertsDashboardsLogsTracing

Secure mTLS Payment Integrations

Security / Payments
  • Problem: External payment integrations required secure communication, certificate renewal and continuity during certificate cycles.
  • Action: Supported mTLS certificate renewal, certificate exchange and secure integration processes.
  • Technical impact: Reduced operational risk and supported secure communication with external providers.
mTLSCertificatesSecure CommunicationPayment Integrations

Cryptographic Processes for POS / miniPOS

Security / Payments
  • Problem: Payment devices required controlled security-related processes and cryptographic material handling.
  • Action: Participated in cryptographic key generation and related secure procedures for POS and miniPOS devices.
  • Technical impact: Supported secure operation of payment devices in controlled transactional environments.
CryptographyPOSminiPOSPayment DevicesPCI-related environments

Digital Voucher Performance Optimization

AWS / Serverless
  • Problem: The digital voucher generation flow needed better execution time and infrastructure cost flexibility.
  • Action: Optimized the voucher generation flow and improved its execution model.
  • Technical impact: Reduced execution time by 97% and improved infrastructure cost flexibility by over 60%.
BackendAWSS3ServerlessPerformance Optimization
04

Tech Stack

Tools and practices that connect application engineering, cloud platform work, security and production operations.

AWS LambdaS3API GatewayEventBridgeSQSSNSDynamoDBAuroraPostgreSQL RDSRedshiftCognitoSecrets ManagerKMSAppConfigELBSES
05

Experience Timeline

A concise progression from frontend foundations into backend engineering, cloud infrastructure and DevSecOps work.

01

Cloud & DevSecOps Engineer

Focused on AWS production workloads, secure delivery, observability, infrastructure automation and payment environments.

AWSDevSecOpsMicroservicesPaymentsReliability
02

Backend Developer

Built and supported backend services, transactional flows and event-driven systems with attention to maintainability and production behavior.

Node.jsNestJSRubyPostgreSQLEvent-driven systems
03

Middle Frontend Developer

Delivered frontend applications with stronger component structure, API integration and product-focused user experience.

ReactVueJavaScriptAPI integration
04

Frontend Web Developer

Developed web interfaces and improved the software foundation that later helped me connect application behavior with platform needs.

FrontendResponsive UIProduct thinking
05

Frontend Web Developer at VLIPCO SAS

Worked on web delivery, interface implementation and practical frontend development in a real business environment.

Web developmentDeliveryCollaboration
06

Frontend Trainee at Academia Geek

Started a structured frontend path with modern web fundamentals, React practice and disciplined learning habits.

ReactJavaScriptHTMLCSS
06

Writing & Technical Notes

A space prepared for practical notes from cloud engineering, DevSecOps and production environments.

Building reliable AWS microservices for payment systems

Notes on architecture, idempotency, operational clarity and maintainability in transactional environments.

Draft in progress

Lessons from running Lambda workloads in production

Cold starts, concurrency, dependency size and practical reliability patterns for serverless workloads.

Draft in progress

Kubernetes and Terraform practices for platform teams

Repeatable infrastructure, controlled change and delivery confidence across cloud environments.

Draft in progress

mTLS and certificates in secure payment integrations

How certificate cycles, continuity and secure communication shape integration work.

Draft in progress

Observability patterns for transactional systems

Dashboards, alerts, logs and traces that help teams detect and explain production behavior.

Draft in progress

CI/CD lessons from production cloud environments

Delivery automation practices that reduce friction between development, security and operations.

Draft in progress
07

Let's build secure, scalable and observable cloud systems.

Open to remote opportunities in Cloud Engineering, DevOps, DevSecOps, Platform Engineering, AWS infrastructure and fintech/payment environments.

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