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Wesley Sims

@wesleysims

Message

I build scalable Golang and Python platforms for fintech and cloud security.

United States

Message

I've built backend services for Visa's FlexPay Core, supporting Buy Now Pay Later lending and installment workflows through Golang microservices, Kafka event pipelines, and AWS deployments.

Previously, I scaled financial API services for Upvest through Vention and built zero-trust security and threat-intelligence systems at Cisco. Across fintech, cybersecurity, and Industrial IoT, I use Golang, Python, cloud infrastructure, and AI-assisted tools to deliver reliable distributed systems.

Experience

Work history, roles, and key accomplishments

Senior Backend Engineer

Visa

Sep 2024 - Apr 2026 (1 year 7 months)

Built Golang microservices for installment scheduling, balance management, and transaction orchestration. Implemented Kafka-based event pipelines and Python FastAPI services for operational tooling.

Go Python fastAPI Kafka AWS Docker CI CD Microservices Event Driven Architecture

Senior Software Engineer

Vention

Sep 2022 - Aug 2024 (1 year 11 months)

Developed Golang microservices for account operations and transaction processing. Integrated OpenAI and Anthropic APIs for AI-assisted workflows and deployed services on AWS and GCP using Kubernetes.

Go Python Kafka GraphQL REST APIs AWS GCP Kubernetes CI CD OpenAI Anthropic

Senior Backend Engineer

Cisco

Apr 2020 - Aug 2022 (2 years 4 months)

Built real-time event processing services in Golang for zero-trust security and cloud posture monitoring. Implemented OAuth2 token validation and developed Python services for security analytics.

Go Python OAuth AWS Distributed Systems Security API Design

Backend Engineer

Softweb Solutions

Oct 2017 - Feb 2020 (2 years 4 months)

Developed backend services for Industrial IoT and operational analytics platforms. Built Golang and Python services for telemetry processing and implemented Kafka-based data ingestion pipelines.

Go Python Kafka AWS GCP Docker REST APIs Microservices