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Mercylin Muthoni

@mercylinmuthoni

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Software engineer building AWS ETL and fintech automation with measurable cost wins.

Zimbabwe

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What I'm looking for

I’m seeking a Software Engineering role where I can build reliable data pipelines, improve reconciliation workflows, and handle incident triage with cross-functional teams—focused on cost optimization, data quality, and production impact.

I’m a Software Engineer with experience building ETL pipelines and fintech automation systems on AWS using Python, SQL, and event-driven orchestration. At Boya, I built transaction reconciliation and document-processing workflows that improved reconciliation frequency from biweekly to daily and reduced processing costs by 30–40%.

I combine data engineering with strong operational discipline—root cause analysis, incident triage, and cross-functional problem resolution—to keep pipelines dependable and costs down. I built event-driven ETL (S3 → Lambda → Redshift) and orchestrated workflows with Apache Airflow, AWS Step Functions, and event triggers, while also triaging 50+ customer issues and reducing repeat production problems through RCA-informed fixes.

Experience

Work history, roles, and key accomplishments

Triage Captain (Additional)

Boya

Mar 2026 - May 2026 (2 months)

Triaged and prioritized 50+ customer issues across payments and reconciliation, reducing mean time to assignment by routing correctly on the first pass. Authored RCAs for critical production incidents and managed issue lifecycles end-to-end from intake through resolution confirmation.

Payments Operations Reconciliations Debugging Production Support

Data Engineering Intern

Boya

Dec 2025 - May 2026 (5 months)

Built an event-driven ETL pipeline (S3→Lambda→Redshift) using OCR and LLM routing, reducing OCR costs by 30–40%. Designed dbt/SQL reconciliation logic across 11 match types, cutting discrepancy detection from days to hours and enabling daily reconciliations.

AWS Lambda S3 Amazon Redshift DBT Apache Airflow AWS Step Functions Amazon Textract EventBridge SQL Optimization ETL

Software Developer

Duhqa Limited

Jul 2023 - Mar 2024 (8 months)

Built Duhqa’s developer portal from the ground up with standardized APIs for B2B commerce and logistics, cutting partner integration time by 50%. Developed a React Native cross-platform mobile application for a combined 100,000+ user base and improved server-rendered Next.js performance (25% faster responses) driving a 20% increase in engagement.

API Development React Native Next.js React Performance Optimization Server Side Rendering Mobile App Development

Web Developer

Beyond My Tribe Org.

Dec 2022 - Jun 2023 (6 months)

Launched Beyond My Tribe’s first website end-to-end and built a React/Redux single-page application as the organization’s primary audience outreach platform. Delivered a fully responsive cross-device experience, increasing post-launch user engagement by 30%.

React Redux Responsive Web Design Frontend Development JavaScript