About Me

A software engineer with a passion for building reliable, scalable systems that solve real business problems.

Kristoffer Kero - Data Engineer

I’m Kristoffer, a data engineer and software engineer originally from Sweden and now based in Texas. My background spans full-stack development, distributed systems, automation, and cloud infrastructure. Over the years, I’ve worked across telecom environments, backend systems, and independent product development, including building and operating a SaaS application under my own LLC.

I bring over seven years of professional software engineering experience, primarily in automation, CI/CD, and backend systems. More recently, my focus has shifted toward data engineering, where I’ve been designing and building cloud-native data pipelines and analytics platforms using modern architectural patterns. My work emphasizes correctness, replayability, and long-term maintainability, drawing heavily on a systems-oriented engineering mindset.

I work primarily in Python, SQL, and Java, and I’m comfortable moving across layers—from ingestion and transformation logic to orchestration, testing, and deployment. What drives me is building systems that not only function, but function reliably over time: systems that are observable, well-documented, and easy for other engineers to understand and extend.

Whether the task is designing a data pipeline, strengthening a backend system, or helping modernize cloud infrastructure, I approach problems with a focus on clarity, ownership, and pragmatic trade-offs. I work independently or integrate seamlessly with existing teams, maintaining professional communication and delivering solutions that are built to last.

Outside of Work

A little about what I enjoy when I’m not building systems

Kristoffer finishing a race
Hiking and outdoor travel

Outside of work, I enjoy running, golf, board games with my wife and kids, and spending time outdoors hiking and traveling. Since moving to Texas, I’ve also picked up deer hunting over the past couple of seasons — it’s been a rewarding way to get outside and learn something completely new.

In work, I bring that same mindset: steady progress, clear communication, and thoughtful execution. If you’re looking for someone who takes ownership, asks the right questions, and integrates cleanly into a team, I’d be happy to talk.

Professional Journey

2023 – Present

Independent Engineer

Kerok Tech LLC

Working as an independent engineer on data engineering pipelines, cloud-native systems, and full-stack product development. This includes building portfolio-grade data platforms on AWS, developing and operating a SaaS product end-to-end, and applying production engineering practices around correctness, automation, and cost-aware architecture.

2019 – 2023

Software Engineer / SDET

TietoEvry (Ericsson ecosystem)

Employed as a software engineer focused on test automation, CI/CD, and reliability for large-scale distributed telecom systems. Built automation frameworks, improved delivery pipelines, and developed a strong foundation in debugging, system behavior, and engineering discipline within highly regulated, high-availability environments.

2016 – 2018

Full-Stack Developer

Independent / Early Career

Built database-backed web applications using jQuery, Laravel, and PostgreSQL. Focused on end-to-end feature development, backend logic, and data modeling—forming the foundation for later work in backend systems, cloud engineering, and data platforms.

What I Believe In

The principles that guide my work

Engineering Excellence

I believe in building systems that are not just functional, but elegant, maintainable, and built to last.

Clear Communication

Complex technical concepts should be explained clearly. Good documentation and communication are as important as good code.

Ownership Mindset

I take full responsibility for the systems I build, from initial design through long-term maintenance.

Continuous Learning

Technology evolves rapidly. I stay current with industry best practices and continuously improve my skills.

Core Competencies

Data Engineering

Building scalable data pipelines and lakehouse platforms

Cloud Architecture

Designing serverless and event-driven systems on AWS

Full-Stack Development

Building complete systems from backend to deployment

Let's Work Together

If you’d like help building reliable data pipelines, improving data quality, or shipping a cloud-native system, let’s talk.