I am an accomplished Senior Full-Stack Engineer with over 8 years of experience architecting and scaling high-traffic platforms in the FinTech, eCommerce, and SaaS sectors. I have expertise in microservices and cloud infrastructure, proficient in modern technology stacks including React, Node.js, Python, and Java. I have demonstrated success in reducing latency by 55%, achieving 98% uptime, and accelerating time-to-market through effective CI/CD automation. As a skilled Agile leader and mentor, I am committed to fostering cross-functional collaboration and delivering secure, business-aligned solutions that drive organizational success. I continuously partner with product managers and engineering teams worldwide to align technical solutions with business strategy and accelerate delivery pace.

Kristen Teo

I am an accomplished Senior Full-Stack Engineer with over 8 years of experience architecting and scaling high-traffic platforms in the FinTech, eCommerce, and SaaS sectors. I have expertise in microservices and cloud infrastructure, proficient in modern technology stacks including React, Node.js, Python, and Java. I have demonstrated success in reducing latency by 55%, achieving 98% uptime, and accelerating time-to-market through effective CI/CD automation. As a skilled Agile leader and mentor, I am committed to fostering cross-functional collaboration and delivering secure, business-aligned solutions that drive organizational success. I continuously partner with product managers and engineering teams worldwide to align technical solutions with business strategy and accelerate delivery pace.

Available to hire

I am an accomplished Senior Full-Stack Engineer with over 8 years of experience architecting and scaling high-traffic platforms in the FinTech, eCommerce, and SaaS sectors. I have expertise in microservices and cloud infrastructure, proficient in modern technology stacks including React, Node.js, Python, and Java. I have demonstrated success in reducing latency by 55%, achieving 98% uptime, and accelerating time-to-market through effective CI/CD automation.

As a skilled Agile leader and mentor, I am committed to fostering cross-functional collaboration and delivering secure, business-aligned solutions that drive organizational success. I continuously partner with product managers and engineering teams worldwide to align technical solutions with business strategy and accelerate delivery pace.

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Experience Level

Expert
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Intermediate
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Work Experience

Senior Full Stack Developer at Ericsson
June 1, 2023 - Present
Led architecture and development of a global multi-cloud SaaS platform with 98% uptime and enterprise-grade security compliance. Engineered a microservices ecosystem in Node.js, Spring Boot, and Python FastAPI reducing API latency by 55% and enabling real-time analytics for mission-critical telecom operations. Spearheaded Kubernetes & Docker container adoption with fully automated CI/CD pipelines, reducing deployment cycles from 2 hours to under 30 minutes. Designed event-driven architectures using Kafka, AWS SNS, and SQS for high-throughput, low-latency workflows enabling instant order processing and AI-powered fraud detection. Implemented GraphQL and REST hybrid APIs optimizing data retrieval, reducing over-fetching by 35%, improving mobile app performance for 1M users. Partnered closely with U.S. and EMEA product managers to align technical solutions with business strategy, accelerating time-to-market by 40% for flagship telecom products. Directed code quality initiatives through pe
Full Stack Developer at Telia
May 31, 2023 - August 25, 2025
Delivered a high-volume e-commerce platform capable of processing $50M PostgreSQL transactions. Optimized API performance through database sharding, Redis caching, and query optimization, cutting average response time from 1.5s to 500ms. Created a GraphQL API gateway to unify multiple legacy systems into a single, secure interface, reducing integration time for partners by 70%. Built multi-region AWS infrastructure with CloudFront CDN, achieving global content delivery under 200ms. Implemented CI/CD workflows with automated testing, achieving zero critical bugs in production releases for 12 consecutive months. Coordinated with cross-border Agile teams in Sweden, the U.S., and Singapore leading to 24/7 development cycles and faster delivery. Developed functional databases, applications, and servers to support websites on back-end.
Software Developer Intern to Junior Developer at Klarna
December 31, 2019 - August 25, 2025
Built and launched 5 RESTful services in Java Spring to support mobile applications serving 100K+ users. Contributed to an internal developer toolkit that reduced onboarding time for new hires by 30%. Documented software development methodologies in technical manuals for IT personnel in future projects. Built databases and table structures for web applications.

Education

Bachelor's Degree in Computer Science at Umea University
March 1, 2013 - August 25, 2025

Qualifications

Microsoft Certified: Azure Developer Associate
January 11, 2030 - August 25, 2025
Certified Scrum Master
January 11, 2030 - August 25, 2025

Industry Experience

Financial Services, Retail, Software & Internet, Telecommunications

Experience Level

Expert
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Expert
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Expert
Expert
Expert
Intermediate
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