Currently not accepting new projects

Data Engineer & Software Engineer

I help teams turn raw data into reliable insights and systems they can trust.

Cloud-native pipelines, automation, and backend engineering — designed for correctness, maintainability, and clear ownership.

7+
Years in Software Engineering
4+
Data Pipeline Projects
AWS
Cloud & Lakehouse
Kristoffer Kero
Based in Texas

What I Do

Areas where I’ve built hands-on experience across data engineering and software systems

Data Engineering & Pipelines

Serverless data pipelines built using AWS-native services (Lambda, Glue, Step Functions), following production-style patterns such as medallion architectures, incremental processing, and explicit orchestration boundaries.

Event-Driven Architecture

Event-driven serverless workflows using API Gateway, SQS, and Lambda. Experience with webhook ingestion, message buffering, retry logic, and error handling in asynchronous distributed systems.

Analytics & Data Warehousing

Analytics workflows built on Snowflake and Python, combining SQL-based warehouse querying with Pandas transformations and interactive visualizations to support exploratory analysis and reproducible reporting.

PySpark & Batch Processing

Distributed batch processing using AWS Glue and PySpark, including schema enforcement, partition-aware transformations, and optimization strategies for non-trivial data volumes.

CI/CD & Infrastructure Automation

CI/CD pipelines built with GitHub Actions, including OIDC-based authentication, automated testing, and idempotent deployment workflows to support reliable iteration and safe changes.

API Integration & Backend Systems

Backend and API development involving RESTful services, third-party integrations (Stripe, Slack, Email, CRM systems), secure secrets handling, and webhook-based workflows.

Why Work With Me

I bring senior-level technical leadership combined with hands-on implementation skills. My approach emphasizes reliability, clarity, and long-term system health over quick fixes.

AWS
🔧

Modern Tech Stack

Cloud-native, battle-tested tools

1

Proven Experience in Distributed Systems

Years of work in telecom automation and DevOps have given me deep understanding of complex, interconnected systems.

2

End-to-End Ownership

Built entire systems alone — including SaaS products, CI/CD pipelines, data platforms, and orchestration workflows.

3

Strong Engineering Discipline

Prioritize clarity, maintainability, observability, and correctness. Systems should be easy to understand, debug, and improve.

4

Full-Stack Breadth with Data Engineering Depth

Background spans SWE, DevOps, and DE — enabling holistic problem-solving across the entire stack.

5

Team Integration or Independent Operation

Deliver results with minimal oversight while maintaining professional communication and clear documentation.

6

Professional Integrity & Reliability

Take pride in doing things right. Detail-oriented, honest, and principled in all engineering decisions.

Featured Expertise

A comprehensive skill set built through years of hands-on experience

Data Engineering & Processing

AWS Glue & PySparkAWS LambdaStep Functions OrchestrationMedallion ArchitectureIncremental ProcessingSchema ValidationParquet & Data FormatsDynamoDB Watermarking

Cloud Data Warehouses & SQL

SnowflakeSQLAlchemySQL Query OptimizationAthena & Glue CatalogWarehouse ConnectivityData ModelingAnalytical SQLCloud Data Architecture

Python & Analytics

Python DevelopmentPandas AnalysisPlotly VisualizationData TransformationExploratory AnalysisReproducible WorkflowsRESTful API DesignError Handling & Retries

AWS Serverless & CI/CD

Lambda FunctionsAPI GatewayAmazon SQSGitHub ActionsOIDC AuthenticationInfrastructure as CodeAutomated TestingCloudWatch Monitoring
AWS
Cloud Platform
Snowflake
Data Warehouse
Python, SQL & Java
Primary Languages
PySpark
Data Processing

Featured Projects

Production systems demonstrating end-to-end data engineering excellence

AWS cloud infrastructure visualization showing distributed data processing
1

Wistia Video Analytics Pipeline

Fully automated AWS-native data pipeline ingesting daily video analytics from Wistia API. Processes data through Bronze/Silver/Gold medallion architecture with incremental updates and DynamoDB watermarking.

AWSStep FunctionsPySparkAthenaLambdaDynamoDB
  • Medallion architecture
  • Incremental processing
  • CI/CD with GitHub Actions
Snowflake data warehouse connected to analytics dashboard with charts
2

Walmart Sales Analytics Pipeline

Python-based analytics workflow connecting to Snowflake for retail sales analysis. SQLAlchemy queries with Pandas transformations and interactive Plotly visualizations exploring seasonal trends.

SnowflakeSQLAlchemyPythonPandasPlotly
  • Programmatic warehouse access
  • Exploratory analysis
  • Reproducible workflows
Serverless architecture with AWS Lambda functions and event flow
3

Real-Time CRM Lead Pipeline

Event-driven serverless pipeline capturing CRM webhooks, enriching lead data with owner information, and delivering real-time Slack notifications with 10-minute SQS buffering.

LambdaSQSAPI GatewayS3Slack
  • Sub-minute latency
  • Idempotent processing
  • Secure secrets management

Let's Build Something Great Together

While I can't currently take on any new contracts, I am usually open to working across a wide range of projects, short or long term, exploratory or production-focused, spanning data engineering, backend systems, and cloud-native architecture. I’m comfortable owning systems end-to-end, and I’m equally open to growing into a role where the scope or technology is still evolving. You can still reach out to schedule an intro call or discuss potential future collaborations. I’m always happy to connect with teams that value reliability, clarity, and long-term system health.

Especially interested in teams that value clarity, ownership, and long-term system quality.

Quick Response

I aim to reply within 1–2 business days

Flexible Engagement

Project-based or ongoing contracts

Global Availability

Based in Texas, open to remote collaboration