I'm seeking an agile, collaborative team.
GS
Looking for a job
Gustavo Sales
@gustavosales
I am a Full‑Stack Engineer with 4+ years building high-performance systems.
BrazilWhat I'm looking for
I have more than 4 years of experience as a developer, mostly building scalable, secure, and cloud-native systems in fintechs. Currently, I work as a Backend Engineer with Liqi Digital Assets where I design event-driven and serverless architecture on AWS to integrate systems with global crypto exchanges, build security, reliability, and cost-saving features into our products, and help run our business services. I develop code on a daily basis in Node.js, TypeScript, Golang, and work with API Gateway, Lambda, DynamoDB, Step Functions, AWS Athena, SQL, etc. In addition to the technical piece, I also have experience with secure data modeling, audit logging, monitoring tools such as Datadog and implementing features with feature flags that allow us more flexibility in rollouts for controlled usage.
Experience
Work history, roles, and key accomplishments
LA
Current
Backend Developer
Liqi Digital Assets
Jun 2024 - Present (1 year 2 months)
Develop and maintain scalable, serverless crypto infrastructure powering enterprise clients (including Itaú), improving performance for high-volume operational routes and processing millions of legacy records. Optimized architecture and processes to reduce cloud costs by more than 10x while implementing integrations with exchanges and audit tracking.
BC
Full Stack Developer
Bounty Card
Apr 2022 - Jun 2024 (2 years 2 months)
Led development of web platforms and payment system APIs, adding queueing, background jobs and third-party integrations to improve reliability and UX. Implemented 200+ unit tests, supervised interns and juniors, and contributed to architecture and client-facing planning.
EL
Mobile/Frontend Developer
Elife
May 2021 - Apr 2022 (11 months)
Developed and launched web and mobile platforms for the Bounty Card project, improving UI performance (up to 10x in table rendering) and reducing bugs via 50+ automated tests. Built performant screens with focus on UX and cross-platform reliability.
Education
Degrees, certifications, and relevant coursework
UDUdemy
AWS Solutions Architect Associate (SAA-C03), Cloud Computing
2025 -
Completed AWS Solutions Architect Associate (SAA-C03) certification via Udemy in 2025.
RORocketseat
NLW Expert: Node.js Track, Web Development
2024 -
Completed the NLW Expert Node.js track focused on Node.js development and practical projects in 2024.
EIEldorado Research Institute
Course - Concepts and Fundamentals, Computer Science Fundamentals
2021 -
Completed courses on algorithms, OOP with Swift, JavaScript, and RESTful APIs at Eldorado Research Institute in 2021.
UPUniversidade Federal do Agreste de Pernambuco
Bachelor of Science, Computer Science
2019 - 2023
Bachelor's degree in Computer Science from Universidade Federal do Agreste de Pernambuco, completed in 2023.
Tech stack
Software and tools used professionally
Availability
Looking for a job
Location
BrazilAuthorized to work in
Portfolio
gust4s-portfolio.vercel.appSalary expectations
55k-100k USD
Social media
Skills
GolangTypeScriptNodeNestJSReactReact NativeNext.jsDockerAWSServerlessEvent Driven ArchitectureDynamoDBPostgreSQLTypeORMPrismaJestCypressGraphQLWebSocketsKubernetesRedisSQSStep FunctionsAPI GatewayLambdaQLDBS3styled componentsReact QueryJavaJavaScriptKotlinGitHubFirebaseAWS LambdaGmailRuby on RailsNodeJSSQLExpressJSDatadog
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