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Igor Sobral
From Brazil 06:26 PM (GMT-03:00)
$50/hr or $120,000/yr

Active 33 minutes ago


Member since Aug 2026

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Software Engineer

Back-end Engineer
Available for hire
Years of experience
5+ years
Experience level
Senior
Available for
Full-time
Available from
13 Aug 2026
Download Resume / CV

I’m a Senior Software Developer with 5+ years of experience designing, modernizing, and delivering high-availability backend systems. I specialize in .NET and C#, with a strong focus on backend APIs, microservices, event-driven systems, AWS, and cloud architecture.

One of my most significant achievements was designing and leading the development of an AWS-based image upload, processing, and cloud storage service used by four high-availability e-commerce platforms. By adopting modern file formats such as WebP and eliminating unnecessary storage redundancy, the solution reduced storage usage by 60%. It also removed the need to store files as database BLOBs, reducing database usage by up to 3 TB.

The new architecture reduced the time required for an uploaded image to appear on an e-commerce product page from as much as 1.5 days to approximately 5 minutes—an improvement of more than 99%. I was responsible for designing the application flow, defining the storage strategy, coordinating the development team, and collaborating with database teams to maintain synchronization across three separate cloud and on-premises databases. The solution also introduced secure backup mechanisms to reduce the risk of file loss or corruption.

I have also coordinated a five-person backend development team in delivering a critical in-house product registration platform that replaced a subscription-based external solution and helped the company avoid thousands of dollars in third-party costs. Although the project was initially estimated to take more than three months, we delivered it in under two months. Through technical coordination, hands-on development, pull request reviews, and quality assurance, we reduced the error rate by 80% and brought production incidents down from more than 50 per month to zero.

My core expertise includes C#, .NET, backend API development, microservices, event-driven architecture, AWS, and cloud-based systems. I combine hands-on engineering experience with technical leadership, working closely with development, database, product, and business teams to transform complex requirements into reliable, scalable, and measurable solutions.

I’m interested in opportunities where I can contribute to the design and evolution of distributed backend systems, lead technically challenging projects, and help engineering teams deliver secure, scalable, and high-impact software.

Employment History

Senior Backend Software Developer at Localiza&Co 2025 - 2026
- Spearheaded the integration of the Getnet payment provider across four interconnected .NET APIs, enabling car rental operations in Mexico. - Engineered scalable asynchronous payment workflows using .NET, RabbitMQ, MongoDB, webhooks, and callbacks, leveraging a high-throughput architecture to ensure reliable transaction processing and data consistency throughout the payment lifecycle. - Raised automated test coverage to over 90% across four payment APIs by implementing comprehensive unit, integration, and load testing, increasing release confidence and validating the platform’s readiness for high transaction volumes. - Introduced feature-flag management with ConfigCat, enabling phased rollouts, safer production releases, rapid feature deactivation, and controlled A/B testing of new functionality. - Coordinated with application security teams to migrate application dependencies and secret-management integrations from Azure Key Vault to AWS, ensuring secure configuration handling and supporting the company’s cloud infrastructure strategy. - Collaborated in the adaptation of business-critical systems to support the new alphanumeric CNPJ (Brazilian business tax identification number) format, replacing numeric-only assumptions across application flows and demonstrating the platform’s flexibility in responding to regulatory changes.
Senior Software Engineer / Tech Lead at FCx Labs 2024 - 2025
- Led a five-person backend engineering team in designing and delivering an in-house product registration platform in under two months, outperforming the original 3+ month estimate while coordinating implementation, pull-request reviews, and technical quality. - Architected the platform from the ground up using .NET, Domain-Driven Design, event-driven architecture, and microservices, replacing a subscription-based external solution and generating an estimated R$ 150K in annual savings. - Engineered integrations across cloud and on-premises environments, connecting the product registration platform with SAP, PostgreSQL, and Oracle Database while maintaining synchronized data across separate database systems. - Implemented near-real-time database synchronization, ensuring product updates made in either cloud or on-premises applications were propagated across systems within five seconds, significantly reducing communication and consistency issues. - Designed a reversible data-change workflow that allowed previously persisted product updates to be safely undone, improving operational control and reducing the risk associated with incorrect or conflicting product information. - Strengthened platform reliability and software quality by increasing automated test coverage from 0% to 35% and reducing the error rate by 80%.
Software Engineer at Home Center Ferreira Costa 2022 - 2024
- Architected and delivered a centralized image upload and cloud storage service using .NET and AWS S3, replacing a legacy model that stored redundant image files across 10+ tables in multiple PostgreSQL and Oracle databases. - Reduced storage consumption by 60% by adopting optimized formats such as WebP, eliminating unnecessary file duplication, and moving binary files from database BLOB storage to AWS S3. - Decreased database storage usage by up to 3 TB, helping reduce annual infrastructure expenses by hundreds of thousands of reais while improving the scalability of the company’s digital commerce platforms. - Accelerated image publishing from up to 36 hours to approximately 5 minutes by designing a synchronization workflow with Qlik Replicate across three cloud and on-premises databases. - Improved file integrity and operational reliability by implementing secure backup mechanisms that minimized the risk of lost or corrupted product images and reduced production incidents. - Coordinated application and database engineering teams throughout architecture, implementation, and data synchronization, delivering a solution that continues to support four high-availability e-commerce platforms.
IT Support Assistant — Apprentice at Home Center Ferreira Costa 2021 - 2022
- Supported day-to-day IT operations by diagnosing hardware and software issues, repairing computers, replacing components, and restoring employee workstations to operational condition. - Configured Windows workstations and installed essential business software, including Microsoft Office, Windows licenses, and corporate user access through Active Directory. - Managed and troubleshot software licensing issues, proactively supporting renewals and resolving Windows and Microsoft Office activation problems to minimize interruptions to employee productivity. - Organized corporate network infrastructure by labeling and routing network cables, improving equipment identification and supporting the expansion of office workstations within a large home-improvement retail store. - Assisted senior IT technicians with hardware maintenance and end-user support, strengthening troubleshooting, communication, and problem-solving skills that provided the foundation for a transition into software engineering.

Education

Systems Analysis and Development at FIAP Current 2026 - Now