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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.…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

Full Stack Developer, Developer, Programmer, +2

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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.…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.

Skills

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Intermediate

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.