Iago Ferreira
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Senior Software Engineer | Typescript | Go | Founder at @sqnc.cloud
Barbacena, Minas Gerais, Brazil
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Independent Software EngineerSequenceAug 2021 - Current (5 years 3 months)Software artisan building reliable systems and helping companies turn complex business problems into well-designed software. Sequence is the structure through which I provide independent software engineering and technical consulting services alongside my professional career. Over the years, my work has evolved from hands-on software development and automation to backend architecture, distributed systems, cloud infrastructure, and technical consulting across fintech, SaaS, marketplaces, and enterprise environments. My work typically involves understanding the business domain, designing the technical approach, and working hands-on to bring systems from architecture to production. Core areas: Backend Engineering
• Distributed Systems- Senior Software EngineerXendoraJan 2026 - Apr 2026 (4 months)Worked on the evolution of a cryptocurrency exchange into international financial infrastructure, focusing on banking capabilities, financial integrations, and scalable backend services.
• Led the technical integration with BVNK, defining API contracts, authentication flows, schemas, and financial domain models
• Designed backend services supporting accounts, transactions, compliance workflows, and financial operations
• Built asynchronous workflows using RabbitMQ to improve system decoupling and reliability
• Applied caching strategies to improve backend performance and scalability
• Contributed to architecture decisions involving distributed services, external integrations, security, and financial data flows This - Specialist Software EngineerItaú UnibancoMay 2024 - Mar 2025 (11 months)Worked as a backend technical specialist within Itaú's Insurance Tribe, supporting digital insurance solutions in one of Latin America's largest financial institutions.
• Designed and developed Java microservices supporting insurance operations and internal banking platforms
• Defined API contracts and integration strategies across cross-functional teams
• Worked with distributed systems and microservices in a large-scale banking ecosystem
• Contributed to architecture decisions focused on scalability, reliability, and maintainability
• Supported microfrontend initiatives by defining efficient integration between frontend applications and backend services Acted as a technical reference across backend development, in - Tech LeadData MarketplaceOct 2023 - May 2024 (8 months)Worked as Technical Lead across startup and consulting initiatives, combining hands-on engineering, architecture, and technical leadership.
• Led the migration of 17 microservices supporting education platforms used by more than 2.8 million users across Latin America
• Acted as the technical reference throughout the six-month migration, coordinating architecture decisions and supporting engineering teams
• Guided developers through implementation challenges, code reviews, and architectural improvements
• Designed and structured a SaaS HR platform using NestJS and PostgreSQL, defining business domains, application architecture, infrastructure, and cloud resources
• Contributed to hiring, team organization, goal setti - Senior Software EngineerBanco BMGJan 2023 - Sep 2023 (9 months)Worked on the modernization of critical banking systems, migrating legacy C# and Sybase applications toward a distributed architecture built with Kotlin, Java, PostgreSQL, and AWS.
• Contributed to the rewrite of the bank's main customer management platform, serving more than 3.5 million users
• Designed distributed backend solutions using AWS Serverless, Redis, RabbitMQ, and Terraform
• Implemented caching and performance strategies for high-volume banking services
• Helped establish reusable infrastructure patterns and engineering standards across teams
• Acted as a technical reference for the team, supporting developers and solving complex engineering challenges This experience was particularly focused on legacy - Senior Software EngineerBTG PactualFeb 2022 - Dec 2022 (11 months)Developed financial systems supporting Asset Management and Investment Funds operations at BTG Pactual.
• Built backend services for back-office applications used by investment teams
• Developed services supporting investment fund quota reconciliation processes
• Worked with C# and MassTransit to implement asynchronous, event-driven workflows
• Used messaging patterns to improve service decoupling and reliability
• Maintained and evolved applications supporting internal financial operations This role introduced me to complex financial domains and event-driven systems, establishing the foundation for my later work in banking and distributed backend architectures. - Mid Level Software EngineerF3 CAPITALAug 2021 - Feb 2022 (7 months)Worked as a Mid-Level Software Engineer building backend systems and cloud-native applications for financial services using Node.js, TypeScript, Azure, MongoDB, and Serverless Framework.
• Developed serverless backend services and REST APIs in a distributed cloud environment
• Designed MongoDB schemas and data access patterns for performance and scalability
• Built internal CLI and developer experience tools to streamline development and deployment workflows
• Automated engineering processes and contributed to CI/CD and cloud infrastructure initiatives
• Collaborated with engineering, product, and business teams on the delivery and evolution of financial applications
• Contributed to technical decisions around - Junior Backend DeveloperSmarti9Mar 2021 - Aug 2021 (6 months)Promoted to Junior Backend Developer after three months as an intern, taking on greater ownership across backend development, project delivery, and team coordination.
• Developed backend services and APIs using Node.js and TypeScript
• Drove backend development across two projects, from technical decisions through implementation and delivery
• Led and supported a team of 7 interns, helping organize development work and providing technical guidance
• Collaborated on backend architecture and technical decisions as the projects evolved
• Worked closely with the team to troubleshoot issues, review implementations, and keep deliveries moving This role marked my transition from an internship into professional backend engi - Backend Developer InternSmarti9Nov 2020 - Mar 2021 (5 months)Joined Smarti9 as a Backend Developer Intern, working primarily with Node.js and TypeScript. During my first three months, I contributed to backend development and quickly took on increasing responsibility across the team's projects, leading to my promotion to Junior Backend Developer.
- Systems Analyst InternGrupo Inovar CursosNov 2019 - Nov 2020 (1 year 1 month)Joined Grupo Inovar Cursos as a Systems Analyst Intern, supporting different areas of the business while gaining hands-on experience in software development, automation, and digital operations.
• Helped rebuild and evolve the company's online course platform using PHP
• Developed Python automations to reduce repetitive operational tasks and improve internal workflows
• Provided technical support to administrative, finance, marketing, and sales teams
• Helped the company adapt its operations during the COVID-19 pandemic, supporting the transition to remote work and online education
• Supported the adoption of Google-based collaboration and productivity tools across the organization This experience gave me early expos
Education
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- Universidade Federal de Minas Gerais — Extensão Engenharia de SoftwareUniversidade Federal de Minas GeraisJan 2023 - Dec 2023 (1 year)
- PUC Minas — Technologist System Analysis and DevelopmentPUC MinasJan 2022 - Dec 2024 (3 years)
- Instituto Federal de Educação, Ciência e Tecnologia do Sudeste de Minas — Technologist Systems for InternetInstituto Federal de Educação, Ciência e Tecnologia do Sudeste de MinasJan 2019 - Dec 2022 (4 years)