Sammy Kariuki

Results-driven Senior Software Engineer with 8+ years of experience building scalable cloud systems, data pipelines, and AI-driven tools at global scale. Proven track record at Microsoft (Azure Core) and Tapestry delivering resilient infrastructure, automated monitoring, and high-performance APIs across AWS and Azure. Experienced across the full stack (Python, TypeScript/Node.js, React) and full SDLC, from systems design through CI/CD to production operations.

Founder of Audriam Technologies, shipping production SaaS for East African SMEs. Holds a CPA-K qualification, bringing rare financial domain knowledge valuable in fintech, banking, and finance-adjacent contexts.

Software Engineer / Senior Software Engineer at Tapestry Inc (via Andela) (2019-07 – Present)

contracted through Andela with Tapestry as client, continuously since 2019; senior role since Jul 2025, concurrent with other engagements

• Infrastructure migration (2025–present): Spearheaded full migration of backend and frontend services from AWS ECS to EKS and transitioned data storage from RDS PostgreSQL to Snowflake-managed PostgreSQL, standardising the stack and enabling unified data access patterns across teams.
• API performance (2025–present): Improved API response time from ~30 seconds to under 2 seconds by designing preprocessed views and tables on transactional data across Snowflake and PostgreSQL.
• API platform (2025–present): Integrated Hasura for instant GraphQL API generation; designed AI-driven automation agents using LangGraph + AWS Bedrock to streamline data pipeline workflows.
• Data pipelines (2019–2022): Built and maintained serverless APIs serving ETL-processed data and a Snowflake data warehouse, improving data accessibility for internal tools and dashboards.
• Web application platform (2019–2022): Designed, built, and deployed a scalable web scraper (Docker, Kubernetes on AWS EKS) serving 45+ sites, forming the backbone of internal data pipelines.
• Quality & testing (2019–2022): Developed a full-stack monitoring tool tracking ETL accuracy and success rates; boosted test coverage from <10% to 85% and implemented CI/CD pipelines with AWS CodeBuild and pre-commit quality gates.

Software Engineer at Microsoft, Azure Core (Host Updates & Quality Tech) (2022-09 – 2025-09)

serving a global, multicultural engineering organisation (concurrent with Tapestry engagement)

• Automation: Automated ad-hoc mitigation processes (node recovery, repave, reset) through ICM automation, streamlining operations and reducing engineering overhead.
• Workflow automation: Implemented automated rollback workflows for faulty VHDs and firmware on Azure nodes, eliminating manual intervention and reducing downtime.
• ETL platform: Designed and deployed an intelligent ETL monitoring system with proactive alerting, significantly cutting incident response time across Azure infrastructure.
• Performance: Reduced ETL execution time by 50% by optimising Kusto (KQL) queries and introducing concurrency.
• AI-assisted operations: Built an AI agent with the DRI Copilot framework analysing host node telemetry to proactively detect server issues, reducing on-call incident resolution time.
• Served in DRI on-call rotation, resolving node OS and platform incidents raised by automations or customers, maintaining high service uptime for Azure customers worldwide.

Senior Backend Engineer — Part-time Consultant at Homeknock Ltd (2020-09 – 2022-12)

• Architected database schemas and RESTful APIs using Flask, integrating with frontend applications and third-party services including UK Land Registry.
• Designed and deployed backend infrastructure (Docker, Jenkins, AWS ECS/EC2) with CI/CD pipelines enforcing quality gates across dev, staging, and production; maintained documentation standards across cross-functional teams.

Technical Team Coordinator at Lifestores Healthcare (via Andela) (2019-03 – 2019-07)

Andela client placement; remote collaboration with Lagos-based team

• Team coordination: Led backend engineering through the team's first API release, coordinating and mentoring junior developers via code reviews, pair programming, and technical planning — collaborating remotely from Nairobi with the Lagos team — while engaging directly with product stakeholders.
• Dockerized the API for production deployment and redesigned the database schema to normalise data structures, improving query performance and maintainability.

Software Engineer at Andela (Internal Projects) (2018 – 2019-03)

full-time; subsequently placed with Andela clients (Lifestores Healthcare, then Tapestry Inc)

• Developed asynchronous file upload in a recruitment automation system, reducing processing time from 4+ minutes to under 10 seconds; built room usage and booking analytics; participated in recruitment interviews and mentorship programs.

Data Analyst at Bundi & Associates (2016-06 – 2018-04)

• Led the first data migration from a manual Excel-based system to automated in-house software; automated annual dividend calculations for 300+ women groups; configured shared, synced databases across offices to ensure data integrity.

BSc in Applied Statistics with Computing – Rongo University, Kenya

CPA-K (Completed Part 6) – KASNEB