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Eduardo Oliveira
From Brazil
$20/hr or $52,000/yr

Active over a week ago


Member since May 2026

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Senior Software Engineer | .NET/C# + Java/Spring Boot | AWS · Microservices

Software Engineer
Available for hire
Years of experience
5+ years
Experience level
Senior

products in the app, climb tiers, and spend them on coupons, discounts, better loan rates, that kind of thing. The interesting part of my job is keeping it up when a campaign triples traffic overnight.

Most of it is .NET and C#, some Java and Spring Boot, all on AWS. I design the APIs, tune the slow queries across DynamoDB and PostgreSQL, and spend a fair amount of time in Datadog working out why latency moved. The last few years have been mostly event-driven systems, so that's where I'm most useful.

I care a lot about code being clear enough that nobody gets paged over it at 2am. I reach for Clean Architecture, DDD and SOLID when they help and leave them alone when they don't — I've seen all three turn into busywork. I also review a lot of PRs and pair with the mid-level devs on the team, which turned out to be the part of the job I like most.

Currently studying for the AWS Solutions Architect Associate and wrapping up a postgrad in software architecture. I work remotely with US companies, overlap US time zones comfortably, and I'm open to full-time or contract.

Stack: C#, .NET (Core/6/7/8+), Java, Spring Boot, Entity Framework, Dapper · AWS (ECS, EC2, Lambda, DynamoDB, S3, SQS, SNS, CloudWatch), Docker, Kubernetes, Terraform · SQL Server, PostgreSQL, MariaDB · Microservices, Event-Driven, DDD, Clean/Hexagonal Architecture, TDD, CI/CD · Datadog, Splunk, Grafana, xUnit, Testcontainers, NBomber

English (C2, EF SET certified) · Portuguese (native)

Employment History

Senior Software Engineer | C#/.NET & Java/Spring Boot | AWS at CI&T Current 2025 - Now
Build microservices in C#/.NET and Java/Spring Boot for the rewards platform (50M+ users), and scaled the architecture as it grew from 2 to 3 business segments without breaking backward compatibility. Redesigned domain contracts and service boundaries between bounded contexts, with services communicating asynchronously over Kafka, so teams could ship in parallel without stepping on each other. Set up production observability in Datadog, Splunk, and StackSpot. We catch and diagnose incidents faster now, and MTTR dropped. Tuned DynamoDB, ECS, and EC2 to survive the traffic spikes during marketing campaigns, and moved us to zero-downtime deploys with canary releases and feature flags. Lead code reviews and technical discussions, mentor mid-level engineers on event-driven patterns and AWS, and keep delivery in sync with product, QA, and SRE.
Mid-Level Software Engineer | C# & .NET at Base2 2023 - 2025
Owned the design and delivery of REST APIs and sync/async integrations for a solar energy platform, in .NET Core, C#, Entity Framework, and Dapper. Sped up MariaDB on the busiest routes with targeted indexing, query tuning, and Dapper in the hot paths. I/O throughput on those endpoints improved noticeably. Built the test suites the project never had: unit and integration with xUnit, NSubstitute, and Testcontainers, load and stress with NBomber, all in CI/CD. Set up isolated Docker dev environments and Grafana dashboards, and wired AWS S3, SQS, SNS, CloudWatch, and Lambda into the async workflows. Built customer-facing frontend in React and TypeScript alongside the APIs, so I could ship features end to end instead of waiting on a separate frontend handoff. Got promoted from mid-level after a steady run on critical features. Ran onboarding for new hires and became the person people came to about backend architecture.
Junior Software Engineer at Markup Sistemas 2021 - 2022
Built ERP modules end to end (manufacturing, billing, delivery, point-of-sale) in C# / .NET Framework 4.8, ASP.NET MVC, and Razor for industrial clients. Tuned T-SQL queries, stored procedures, and Entity Framework on SQL Server. Reports ran faster and data access held up on big datasets. Improved the backoffice UI with HTML, CSS, and jQuery to make daily work easier for internal users.

Education

Bachelor's in Computer Science at Estácio Sá Current 2023 - Now