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Jefferson Mariano de Souza

Senior Software Engineer | Software Architect
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Professional Summary

Senior Software Engineer and Architect with 20+ years of experience building scalable, high-availability distributed systems. Proven expertise in implementing AI-Augmented Engineering workflows using Spec-Driven Development (SDD) and autonomous agent orchestration to maximize SDLC fidelity and speed. Expert in TypeScript (Node.js/React), Java, and Python within AWS Cloud-native environments (EKS, CDK, Lambda). Proven track record of leading massive migrations (2,500+ components), designing event-driven microservices, and optimizing data architectures for catalogs exceeding 500M records with sub-second P99 latency. MBA-educated in Software Architecture with a focus on Spec-Driven Development and AI-augmented engineering.

Technical Skills

AI & Agents: Spec-Driven Development (SDD), Multi-agent Orchestration, Task Delegation to Subagents, Custom Skills/Rules Creation for LLMs
AI Tools: Cursor, Claude Code, GitHub Copilot, Integration with MCPs (Model Context Protocol)
Backend: Node.js, TypeScript, gRPC, AWS (EKS, CDK), Event-Driven System Design
Languages: TypeScript, Java, Clojure, Python, Groovy, Ruby, SQL, PL/SQL
Frameworks: Node.js (NestJS), React, Next.js, Spring Boot, Grails, Django, RoR
Cloud & DevOps: AWS (CDK, EKS, Lambda, SQS, SNS, EventBridge), Docker, Kubernetes, ArgoCD, GitLab CI
Data & Storage: PostgreSQL, Oracle, MongoDB, DynamoDB, Redis, Redshift, OpenSearch, SAP HANA
Architecture: Microservices, Event-Driven Design, Functional Programming, gRPC, HL7, Kafka

Professional Experience

Engine

Senior Software Engineer
  • AI-Augmented Software Engineering: Implemented Spec-Driven Development (SDD)-based workflows, leveraging AI for complex task planning and autonomous execution via subagents.
  • LLM Orchestration: Developed and maintained custom Skills and Rules for AI agents, delegating granular tasks to subagents and integrating them via MCPs (Model Context Protocol) for external tool and context access.
  • SDLC Optimization: Drastically reduced development cycle time and increased code fidelity through automation of AI-mediated technical design and architecture review processes.
  • Search & gRPC Architecture: Designed high-performance integrations using gRPC for global travel search modules, ensuring rigorous data contract compliance between microservices and AI agents.
  • Search API Optimization: Responsible for backend integrations via gRPC for a high-traffic travel search engine, ensuring rigorous data contract compliance between microservices.

Akido Labs

Senior Software Engineer
  • Healthcare Systems: Architected an HL7-compliant EHR system, decomposing large-scale medical workflows into domain-driven microservices for maximum fault isolation and scalability.
  • Service Ownership: Engineered the "Orders and Results" lifecycle using NestJS, Kafka, and PostgreSQL, automating the end-to-end integration between physicians and laboratories.
  • Performance Engineering: Utilized Datadog and LogRocket to identify bottlenecks, implementing Redis caching to drastically improve user-perceived speed and query responsiveness.
  • Modern CI/CD: Orchestrated containerized deployments on AWS EKS (Kubernetes) via ArgoCD pipelines; enforced quality through Vitest, Jest, and Testcontainers.

Jungle Scout

Senior Software Engineer
  • High-Scale Data Pipelines: Designed and maintained a robust scraping and data-polishing pipeline supporting a catalog of 500M+ products using AWS Redshift.
  • Latency Optimization: Re-engineered UI and API layers to achieve P99 latency within milliseconds, significantly improving dashboard responsiveness for Amazon sellers.
  • FinOps & Billing Architecture: Designed a cloud-native, event-driven billing engine using AWS CDK, EventBridge, and DynamoDB to track real-time API usage and prevent resource abuse.
  • AI Integration: Leveraged GitHub Copilot to accelerate development cycles and automate boilerplate code generation across a polyglot stack (Node.js, Ruby, Python).

Synchro

Software Architect
  • Architectural Leadership: Directed the full SDLC for high-availability tax systems, aligning technical feasibility with business deadlines in collaboration with Product Owners.
  • Large-Scale Migration: Spearheaded the transition of a massive frontend ecosystem (2,500+ components) from JavaScript to TypeScript, significantly increasing type safety and developer velocity.
  • Engineering Quality: Engineered GitLab CI pipelines to automate testing/quality gates and conducted rigorous code reviews to enforce SOLID and Clean Code principles.

Synchro

Senior Full Stack Developer
  • Functional Programming Pivot: Extracted core business logic from a Spring Boot monolith into a Clojure-based microservice to leverage functional paradigms for better scalability.
  • Performance Engineering: Achieved a 40% reduction in VM memory consumption through Clojure's efficient resource management and optimized JVM tuning.
  • Data Strategy: Integrated SAP HANA (v1/v2) using JDBC and calculation views to handle complex, high-volume tax calculation logic.
  • Team Upskilling: Led staff training on React.js, MobX, and ES6+, establishing modern UI benchmarks and component-based design patterns across the organization.

Synchro

Full Stack Developer
  • Cloud & Messaging: Developed scalable services using Spring Boot, Groovy, and AWS (EC2, SQS, S3); implemented asynchronous messaging via RabbitMQ and ActiveMQ.
  • Automation Tooling: Built custom desktop automation tools using Python (Sikuli/OpenCV) to streamline internal manual workflows.
  • Database Management: Managed schema evolution across PostgreSQL, Oracle, and MongoDB using Liquibase for version-controlled deployments.

Synchro

JEE Developer Analyst / Java Developer
  • High-Availability Compliance: Built mission-critical tax legal update engines using Grails and Groovy that remain in continuous production today.
  • Operational Systems: Developed a company-wide ticket and timesheet management system using Hibernate and ICEfaces, supporting 100% of internal employees and customers.

IBM

Software Developer
  • Global Support: Maintained Sprint/Nextel billing systems (millions of records) using VB.NET, Java, and PL/SQL in a Unix AIX environment.
  • Process Efficiency: Automated financial reporting via Crystal Reports, reducing manual effort by 20 hours per week.

AKB IT Solutions

Backend Developer Intern
  • Database Optimization: Developed and tuned complex queries and database logic using PL/SQL and Oracle, focusing on performance tuning and data integrity.

Education

  • MBA in Software Architecture | Full Cycle | 2025
  • MBA in Strategic Business Management | Anhanguera Educacional | 2010
  • B.S. in Computer System Analysis | Centro Universitário Salesiano de São Paulo - UNISAL | 2008
  • Technical IT Degree | ETE Polivalente de Americana | 2004
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