Jeferson Sá
São Paulo,SP
Summary
Senior Software Engineer and Solutions Architect with over 16 years of experience in building, modernizing, and scaling critical systems. A strong hands-on approach has been developed within complex corporate environments characterized by high technical and regulatory demands, successfully leading initiatives from transitioning legacy systems to cloud-native ecosystems and creating highly scalable, mission-critical platforms. Committed to delivering real value through reliability, performance, and operational cost optimization while serving as a cross-functional reference for multiple teams to elevate architectural standards via Platform Engineering practices and a deep understanding of Business and Domain-Driven Design (DDD). Expertise in designing and implementing high-concurrency using Java and Python ecosystems, supported by cloud infrastructures (GCP, OCI), containers (Kubernetes, Docker), and event-driven architectures (Kafka, Rabbit), along with a pragmatic application of Artificial Intelligence to integrate Generative AI, RAG, vector databases, and multi-agent workflows for enhanced process automation and engineering productivity.
Overview
17
17
years of professional experience
1
1
Certification
Work History
Senior Solutions Architect & Staff Software Engineer| Data & AI
OVERLABS
São Paulo, Brazil
01.2026 - Current
- I work as a Pre-Sales Specialist focused on Digital, Data & AI, supporting the company in designing consultative solutions for the market, reviewing internal products, and structuring expansion plans related to digital transformation, data platforms, cloud modernization, and Artificial Intelligence.
- I combine hands-on software architecture, enterprise modernization, data platforms and AI governance to help companies design and deliver scalable digital platforms.
- Key responsibilities and achievements:
- Supported the creation and evolution of go-to-market solutions in Digital, Data & AI, connecting the company’s technical capabilities with real customer business challenges.
- Led consultative discussions with enterprise clients to identify opportunities in system modernization, digital transformation, cloud adoption, data platforms, and Generative AI.
- Conducted technical and strategic assessments to identify gaps across systems, architecture, software development processes, security, governance, scalability, and operational efficiency.
- Supported application modernization initiatives, covering SDLC evolution, DevSecOps practices, application architecture, integration strategies, cloud adoption, and digital platform modernization.
- Worked on data architecture initiatives focused on GCP, Databricks, Data Lakes, Lakehouse architecture, data governance, data quality, security, and enterprise readiness for GenAI adoption.
- Contributed to the definition of governance models for corporate Generative AI platforms, including security, access control, prompt lifecycle management, responsible AI usage, auditability, compliance, and scalability.
- Helped translate complex technical challenges into business-oriented solution narratives, supporting proposals, executive presentations, roadmaps, and strategic sales opportunities.
Principal Solutions Architect / Innovation Director — GenAI, Cloud & Platform Engineering
V8.TECH
São Paulo, Brazil
02.2025 - 12.2025
- Promoted internally to an executive innovation role while maintaining a hands-on contribution across software architecture, technical pre-sales, and enterprise solution design.
- Key responsibilities and achievements:
- Led architecture and technical strategy for cloud-native modernization initiatives, internal platforms, and enterprise-grade GenAI solutions.
- Defined and implemented reference architectures for RAG and AI agent-based solutions, covering governance, security, response evaluation, observability, scalability, and operational readiness.
- Created internal engineering productivity products focused on AI for Code and SDLC acceleration, supporting discovery, software development, code review, documentation, and delivery workflows.
- Acted directly in complex technical pre-sales, leading technical discovery, solution design, roadmap definition, feasibility analysis, and executive-level presentations.
- Served as a technical reference for multiple teams, supporting critical architecture decisions and reducing risks related to scalability, maintainability, security, and operations.
- Connected business strategy, innovation, and engineering execution to transform client challenges into scalable digital, cloud, data, and AI solutions.
- Supported the evolution of internal offerings and go-to-market narratives for modernization, platform engineering, DevSecOps, AI adoption, and enterprise architecture.
- Impact:
- Led more than 50 enterprise opportunities involving cloud modernization, GenAI, platform engineering, and digital transformation.
- Contributed to the creation of 2 internal AI-powered engineering products focused on SDLC productivity and software delivery acceleration.
- Supported architecture decisions across 6 teams, helping reduce technical risk and improve solution scalability.
- Helped structure technical roadmaps and proposals for enterprise clients across modernization, data, cloud, and AI initiatives.
Principal Software Engineer — Financial Infrastructure, Big Data & Cloud Native Platforms
CERC Central de Recebíveis S.A.
São Paulo, Brazil
03.2022 - 08.2022
- Worked as a Staff Software Engineer at a high-growth financial infrastructure company operating a receivables registry platform with critical scalability, reliability, and regulatory requirements.
- Focused on modernizing critical applications and infrastructure, improving scalability, reducing cloud and operational costs through FinOps practices, and increasing the resilience of core systems in a fast-paced startup environment.
- Key responsibilities and achievements:
- Led technical architecture initiatives for the modernization of critical billing systems, redesigning core product components built with .NET and Java into a cloud-native, containerized architecture.
- Designed and supported the migration of critical workloads to cloud environments across GCP and Azure, using Kubernetes, Helm, event-driven architecture, and modern DevOps practices.
- Contributed to the evolution of cloud-native platforms focused on scalability, resilience, maintainability, and cost efficiency.
- Architected and supported data-intensive solutions at scale, working with Spark, Airflow, BigQuery, and large-volume analytical workloads.
- Collaborated directly with Google product teams to optimize one of the largest BigQuery usage environments globally, focusing on performance, scalability, cost optimization, and operational efficiency.
- Supported FinOps initiatives to reduce infrastructure costs, improve cloud resource utilization, and increase transparency over technology spend.
- Addressed structural technical debt in critical financial and regulatory systems, improving stability, reliability, and operational confidence.
- Acted as a technical reference for engineering teams, guiding architecture decisions, cloud migration strategies, scalability improvements, and production-readiness practices.
Principal Software Engineer — Payments, Digital Banking & Distributed Systems
PagBank
Greater São Paulo Area
04.2018 - 04.2022
- Progressed from Staff Software Engineer to Staff Software Engineer III, working at the core of a leading fintech during its transformation into a digital bank and a period of significant platform scalability growth.
- Focused on mission-critical back-office, payments, compliance, regulatory, and high-concurrency systems, with strong emphasis on availability, consistency, scalability, resilience, and architectural evolution.
- Key responsibilities and achievements:
- Worked on mission-critical payment and financial systems, supporting high availability, transactional consistency, scalability, and operational resilience in a regulated fintech environment.
- Led cross-functional technical initiatives involving up to 20 engineering squads, ensuring architectural alignment, technical direction, and sustainable platform evolution.
- Designed and evolved event-driven architectures to reduce coupling, improve system resilience, increase scalability, and support more reliable business operations.
- Participated in strategic architecture decisions for highly regulated, high-volume, and high-concurrency environments, including back-office, compliance, and Central Bank regulatory requirements.
- Acted as a technical reference for engineering teams, guiding architectural decisions, reviewing solution designs, and supporting critical production and scalability challenges.
- Helped modernize core financial platforms by improving system integration patterns, reducing technical debt, and enabling more scalable and maintainable software delivery.
- Collaborated with product, engineering, architecture, compliance, and operations teams to translate business and regulatory requirements into robust technical solutions.
- Supported the evolution of engineering practices related to software architecture, distributed systems, observability, reliability, and platform scalability.
Senior Software Architect
Multiplus S/A
Greater São Paulo Area
12.2015 - 04.2018
- Worked as a Principal Software Architect focused on high-traffic digital products across e-commerce, loyalty, airline, and travel-related platforms.
- Led solution architecture initiatives for customer-facing platforms, supporting checkout, payment gateways, dynamic pricing, mobile applications, and scalable digital experiences.
- Key responsibilities and achievements:
- Designed solution architectures for high-traffic digital products, including e-commerce, loyalty, airline, and insurance-related platforms.
- Led the architecture of checkout platforms, payment gateway integrations, and dynamic pricing solutions for airline and insurance products.
- Supported the modernization of digital platforms through microservices, event-driven architecture, and scalable backend services built with Java.
- Designed integration patterns to improve scalability, maintainability, and flexibility across business-critical digital channels.
- Used GraphQL to optimize data consumption for frontends and mobile applications, improving integration efficiency and user experience.
- Collaborated with product, engineering, business, and UX teams to translate commercial needs into scalable and reliable technical solutions.
- Acted as an architectural reference for digital product teams, guiding technical decisions related to platform evolution, system integration, and service decomposition.
Cofounder
Code 2 Cloud Technology
Greater São Paulo Area
01.2015 - 12.2017
- Founded and led a technology consulting and training company focused on helping organizations adopt emerging cloud, data, and DevOps technologies.
- The company was created during the early adoption phase of cloud computing, Big Data platforms, and containerization, supporting clients and professionals in understanding, implementing, and modernizing their technology capabilities.
- Key responsibilities and achievements:
- Founded and operated a consulting and training business focused on Cloud Computing, Big Data, DevOps, and modern software engineering practices.
- Delivered consulting and technical training programs on AWS, Oracle Cloud Infrastructure, Hadoop, Spark, Docker, and distributed systems fundamentals.
- Helped companies and technology professionals understand and adopt early cloud-native, data-intensive, and container-based architectures.
- Designed educational content, workshops, and hands-on labs to accelerate learning and practical adoption of modern infrastructure and data technologies.
- Supported clients in evaluating cloud adoption strategies, infrastructure modernization paths, and opportunities to improve scalability and operational efficiency.
- Acted as an early evangelist for cloud platforms, Big Data ecosystems, and containerization technologies in the Brazilian market.
- Combined technical depth, business development, client advisory, and training delivery to build credibility and generate consulting opportunities.
Lead Solutions Architect — Enterprise Integration, Big Data & Legacy Modernization
Alpar
Greater São Paulo Area
05.2015 - 12.2015
- Worked as a Lead Solutions Architect with a dual focus on modernizing mission-critical legacy systems and introducing Big Data architectures for enterprise clients, including Sem Parar and Porto Seguro.
- Supported both the evolution of complex Java/SOA-based integration environments and the design of data-intensive platforms using the Hadoop ecosystem.
- Key responsibilities and achievements:
- Led technical initiatives focused on the modernization, sustainment, and evolution of mission-critical legacy systems in enterprise environments.
- Supported clients such as Sem Parar and Porto Seguro in complex integration, system modernization, and data platform initiatives.
- Participated in the design and development of an internal Big Data product using the Hadoop ecosystem, including Cloudera, Hortonworks, Spark, HBase, Hive, and distributed data processing patterns.
- Helped introduce Big Data architectures to support large-scale data processing, analytics, and data-driven business capabilities.
- Led the technical evolution of complex integration architectures based on Java, SOA, enterprise services, and high-criticality operational environments.
- Acted as a technical reference for teams working on legacy modernization, enterprise integration, system stability, and architectural evolution.
- Collaborated with engineering, architecture, and business stakeholders to translate complex legacy challenges into sustainable modernization strategies.
- Impact:
- Supported modernization initiatives for critical legacy systems in large enterprise environments.
- Helped introduce Big Data architecture patterns using Hadoop, Spark, HBase, Hive, Cloudera, and Hortonworks.
- Contributed to internal product development focused on large-scale data processing.
- Supported enterprise clients in improving scalability, maintainability, and reliability across critical integration platforms.
Solutions Architect / Technical Lead — Telecom, Enterprise Integration & Application Modernization
SysMap Solutions
São Paulo, Brazil
10.2014 - 05.2015
- Led the technical conception and solution design for complex enterprise environments across major telecom clients, including Claro, Vivo, and Nextel.
- Focused on application modernization, application governance, database migration, enterprise integration, and the evolution of large-scale legacy platforms in heterogeneous corporate environments.
- Key responsibilities and achievements:
- Led technical solution design for complex enterprise projects in the telecom industry, working with large-scale and heterogeneous technology environments.
- Designed architectures for application modernization, application governance, database migration, and enterprise system integration initiatives.
- Supported modernization and integration strategies for monolithic and legacy platforms, including Oracle EBS, BSCS, and other business-critical telecom systems.
- Acted as a technical reference during pre-sales, discovery, solution validation, and project delivery phases.
- Ensured technical feasibility of proposed solutions by validating architecture decisions, integration patterns, implementation risks, and delivery constraints.
- Worked closely with engineering, delivery, business, and client stakeholders to translate complex enterprise requirements into scalable and executable technical solutions.
- Followed the delivery of high-complexity projects, supporting technical decisions, risk mitigation, and alignment between architecture and implementation teams.
Integration Architect — Telecom & Enterprise Systems
NTT DATA, Inc.
Greater São Paulo Area
04.2014 - 09.2014
- Worked as an Integration Architect focused on the telecom industry, designing robust integration architectures for complex enterprise systems.
- Focused on high availability, performance, scalability, and reliability across mission-critical integration environments.
- Key responsibilities and achievements:
- Designed integration architectures for telecom enterprise systems, ensuring reliability, scalability, high availability, and performance.
- Defined integration patterns to connect complex business-critical systems across heterogeneous technology environments.
- Supported architecture decisions related to system interoperability, service orchestration, data exchange, and enterprise integration.
- Worked closely with technical teams, business stakeholders, and client architecture teams to translate integration requirements into executable technical solutions.
- Helped improve the reliability and maintainability of integration layers supporting critical telecom operations.
- Contributed to the technical validation of integration designs, identifying risks, dependencies, and architectural constraints.
Staff Software Engineer — Performance, Java Concurrency & High-Volume Telecom Systems
SysMap Solutions
São Paulo, Brazil
04.2013 - 04.2014
- Worked as a Staff Software Engineer focused on low-level engineering, performance optimization, and scalability tuning for prepaid billing systems in the telecom industry.
- Focused on high-volume transaction processing, critical batch workloads, Java concurrency, Linux environments, shell scripting, and database optimization.
- Key responsibilities and achievements:
- Worked on mission-critical prepaid billing systems for a telecom operator, focusing on performance, scalability, reliability, and operational efficiency.
- Rewrote a critical billing processing job using advanced Java multithreading and concurrent programming techniques.
- Reduced the execution time of a critical billing workload from days to only a few hours, significantly improving processing efficiency and operational reliability.
- Solved complex scalability and performance bottlenecks in high-volume transaction processing environments.
- Worked directly with Linux, shell scripts, database optimization, JVM behavior, and application-level tuning to improve system throughput.
- Supported the stabilization and evolution of critical telecom systems with strong requirements for accuracy, performance, and availability.
- Acted as a technical reference for complex troubleshooting, root cause analysis, and performance improvement initiatives.
System Integration Specialist — Event-Driven Architecture, Telecom & Banking Systems
Indra
São Paulo, Brazil
05.2012 - 11.2012
- Worked as a System Integration Specialist supporting enterprise clients such as Vivo and Banco do Nordeste, with a focus on mission-critical system integration, event-driven architecture, and legacy modernization.
- Focused on designing and implementing robust integration solutions for complex telecom and banking environments, connecting legacy platforms with modern application architectures.
- Key responsibilities and achievements:
- Designed and implemented complex system integration solutions for mission-critical environments in the telecom and banking sectors.
- Worked with enterprise clients such as Vivo and Banco do Nordeste, supporting high-criticality integration and modernization initiatives.
- Designed event-driven integration architectures to improve system interoperability, scalability, reliability, and operational efficiency.
- Supported the modernization of legacy systems, including PowerBuilder-based applications, toward more modern .NET and Java-based architectures.
- Helped define integration patterns for heterogeneous enterprise environments, connecting legacy platforms, business-critical systems, and modern applications.
- Collaborated with technical teams, business stakeholders, and client architecture teams to translate complex integration requirements into executable solutions.
- Contributed to technical feasibility analysis, architecture validation, and implementation support for system modernization projects.
Senior Software Engineer
SysMap Solutions
Greater São Paulo Area
05.2011 - 05.2012
- Worked as a Senior Software Engineer focused on large-scale corporate system integration, including ERP, billing, CRM, and business-critical platforms.
- Developed enterprise-grade Java applications for large-scale corporate system integration, including ERP, billing, CRM, and business-critical platforms.
- Worked on integration initiatives focused on API centralization, service governance, interoperability, and maintainability across complex enterprise environments.
- Supported major telecom and banking clients, including Vivo, Claro, and Banco Votorantim, in high-complexity software development and integration projects.
- Participated in one of the early agile adoption initiatives at Vivo, working within pioneering squad-based delivery models around 2009/2010.
- Developed critical number portability systems following strict regulatory requirements from Anatel, the Brazilian telecommunications regulatory agency.
- Built software solutions for regulated telecom environments, with strong requirements for reliability, traceability, accuracy, and operational continuity.
- Collaborated with cross-functional teams to deliver enterprise integration solutions connecting legacy systems, business platforms, and customer-facing services.
- Established a strong engineering foundation in Java, enterprise architecture, system integration, APIs, and regulated business domains.
Java Software Engineer — Enterprise Integration, Telecom & Banking Systems
BearingPoint NV
Brazil
06.2009 - 04.2012
- Rapidly progressed from Junior Software Developer to Senior Software Engineer, working on large-scale enterprise projects for major clients such as Vivo, Claro, and Banco Votorantim.
- Built a strong hands-on foundation in Java Enterprise development, system integration, API centralization, governance, and mission-critical platforms across telecom and banking environments.
- Key responsibilities and achievements:
- Developed enterprise-grade Java applications for large-scale corporate system integration, including ERP, billing, CRM, and business-critical platforms.
- Worked on integration initiatives focused on API centralization, service governance, interoperability, and maintainability across complex enterprise environments.
- Supported major telecom and banking clients, including Vivo, Claro, and Banco Votorantim, in high-complexity software development and integration projects.
- Participated in one of the early agile adoption initiatives at Vivo, working within pioneering squad-based delivery models around 2009/2010.
- Developed critical number portability systems following strict regulatory requirements from Anatel, the Brazilian telecommunications regulatory agency.
- Built software solutions for regulated telecom environments, with strong requirements for reliability, traceability, accuracy, and operational continuity.
- Collaborated with cross-functional teams to deliver enterprise integration solutions connecting legacy systems, business platforms, and customer-facing services.
- Established a strong engineering foundation in Java, enterprise architecture, system integration, APIs, and regulated business domains.
Education
MBA - Data Science - BIG DATA
FIAP
Sao Paulo01-2015
Bachelor of Science - Analise De Sistemas
Fatec
Sao Paulo01-2013
Bachelor of Science - Computer Science
Universidade Do Oeste Paulista
Presidente Prudente01-2009
Skills
- Full-Stack Development
- Cloud Native / K8s
- EDA & Apache Kafka
- Systems Design
- DevSecOps implementation
- Microservices architecture
- Application modernization
- Software development lifecycle
Certification
- Google Professional Cloud Architect Certification
Languages
English (Professional Working)
Timeline
Senior Solutions Architect & Staff Software Engineer| Data & AI
OVERLABS
01.2026 - Current
Principal Solutions Architect / Innovation Director — GenAI, Cloud & Platform Engineering
V8.TECH
02.2025 - 12.2025
Principal Software Engineer — Financial Infrastructure, Big Data & Cloud Native Platforms
CERC Central de Recebíveis S.A.
03.2022 - 08.2022
Principal Software Engineer — Payments, Digital Banking & Distributed Systems
PagBank
04.2018 - 04.2022
Senior Software Architect
Multiplus S/A
12.2015 - 04.2018
Lead Solutions Architect — Enterprise Integration, Big Data & Legacy Modernization
Alpar
05.2015 - 12.2015
Cofounder
Code 2 Cloud Technology
01.2015 - 12.2017
Solutions Architect / Technical Lead — Telecom, Enterprise Integration & Application Modernization
SysMap Solutions
10.2014 - 05.2015
Integration Architect — Telecom & Enterprise Systems
NTT DATA, Inc.
04.2014 - 09.2014
Staff Software Engineer — Performance, Java Concurrency & High-Volume Telecom Systems
SysMap Solutions
04.2013 - 04.2014
System Integration Specialist — Event-Driven Architecture, Telecom & Banking Systems
Indra
05.2012 - 11.2012
Senior Software Engineer
SysMap Solutions
05.2011 - 05.2012
Java Software Engineer — Enterprise Integration, Telecom & Banking Systems
BearingPoint NV
06.2009 - 04.2012
MBA - Data Science - BIG DATA
FIAP
Bachelor of Science - Analise De Sistemas
Fatec
Bachelor of Science - Computer Science
Universidade Do Oeste Paulista
Contact
- Jeferson.bsa@gmail.com
- Www.linkedin.com/in/jefersonsa (LinkedIn)
- Www.csc.com/ (Company)