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Deyllon Ramos

@deyllonramos

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Senior Backend Engineer at C6 BANK automating dividend processing with Kotlin, Spring Boot and Kafka.

Brazil

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At C6 BANK, I designed financial data pipelines that process transaction files and store tax-related data in PostgreSQL. I also automated dividend processing by connecting events, tax rules and credit operations with failure handling and reprocessing.

At SYSMAP SOLUTIONS, I modernized authentication for a healthtech platform, evolving its OAuth2, JWT and JWKS architecture and coordinating integrations across squads and international partners. I also moved activity synchronization out of the login flow, reducing users’ wait time by over 95%.

Earlier at SYSMAP SOLUTIONS, I built Kotlin and Spring Boot BFFs and improved voucher microservices. I also optimized Kafka-based data replication during educational institution integrations, reducing Kafka topic size by 80%.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

C6 Bank

Mar 2026 - Present (8 months)

Designed and implemented financial data ingestion pipelines with Kotlin, Spring Boot, AWS SQS and S3. Automated dividend processing and improved financial precision across PostgreSQL tables.

Kotlin Spring Boot AWS SQS S3 PostgreSQL Kafka Kafka Streams Grafana

Senior Backend Engineer

Sysmap Solutions

Jan 2025 - Mar 2026 (1 year 2 months)

Served as primary technical reference for authentication modernization, reducing user wait time by over 95% and cutting endpoint latency by 64%. Optimized resource usage and led technical decisions.

NodeJS BullMQ Redis OAuth JWT JWKS SQL AWS Kotlin Spring Boot Coroutines

Mid-level Backend Engineer

Sysmap Solutions

Jan 2023 - Jan 2025 (2 years)

Built and optimized BFFs using Kotlin, Spring Boot and Coroutines. Enhanced voucher microservices with Node.js and NestJS, and increased Jest test coverage from 30% to 80%.