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Jon Karlsen

@jon-karlsen

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Senior backend engineer shipping PostgreSQL/AWS systems and modernizing cloud infrastructure.

South Korea

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What I'm looking for

I’m looking to own backend platforms end to end—modernizing cloud infrastructure, improving observability, and scaling delivery. I want a team where automation, technical standards, and mentoring junior developers are valued.

I’m a senior backend engineer with five years shipping backend systems on PostgreSQL, AWS, and Terraform. I’m comfortable owning a system from proof-of-concept through production—plus the stakeholder conversations that make delivery stick.

At Azets Document Solutions, I led the cloud migration rollout of a document processing system, replacing legacy on-premise infrastructure and cutting operational costs by 35%. I also rebuilt the observability story by expanding an internal monitoring tool into a full operations suite, freeing about 15 hours per week and improving incident response time by 30%.

Before that, I initiated and led a Terraform-driven infrastructure modernisation proof-of-concept that demonstrated high availability and projected a 40% cost reduction—earning leadership buy-in and setting up the production rollout. I reduced average troubleshooting time for operational incidents by 50% by building internal tooling to monitor and aggregate distributed system logs.

I also focus on team velocity and quality: I set up automated testing, CI/CD, and learning-focused code reviews to increase velocity by 3x. Alongside day-to-day engineering, I’ve built side projects that reinforce my engineering style—clean client/server separation, offline-first behavior, and reliable data-backed experiences.

Experience

Work history, roles, and key accomplishments

Lead Software Engineer

Azets Document Solutions

Jan 2025 - Aug 2025 (7 months)

Led the full rollout of a cloud-based document processing system, replacing legacy on-prem infrastructure and cutting operational costs by 35%. Expanded internal monitoring into an operations suite, freeing ~15 hours per week and improving incident response time by 30%, while codifying standards and mentoring junior developers.

Terraform AWS Observability Monitoring CI CD Docker System Design PostgreSQL TypeScript SQL

Software Engineer

Azets Document Solutions

Jun 2022 - Jan 2025 (2 years 7 months)

Initiated a Terraform-based cloud infrastructure modernization proof-of-concept that demonstrated high availability and projected a 40% cost reduction, enabling leadership buy-in for production rollout. Reduced average incident troubleshooting time by 50% and improved observability by building internal distributed-log monitoring tooling, then increased team velocity 3x through automated testing, C

Terraform AWS Observability CI CD PostgreSQL SQL System Design Code Review High Availability

Software Engineer

LittleFish

Nov 2020 - Jun 2022 (1 year 7 months)

Created a workflow-optimized warehouse management application interfacing with a customer ERP to reduce order fulfilment time by 10%. Migrated an in-house HR application from .NET Framework to .NET Core and lowered production bugs by 10% and regression issues by 25% by moving business logic from SQL stored procedures into C# with automated testing and version control.

C .NET Core .NET Framework Automated Testing ERP Integration Version Control Debugging Performance Optimization Production Support

Education

Degrees, certifications, and relevant coursework

OpenClassrooms

Diploma, Full-Stack Web Development

2019 - 2021

Grade: Pass

Activities and societies: Activities and societies: Developing and improving application software. Designing technical architecture. Implementing software tests and debugging code. Producing the design schema of a database. Writing technical and functional documentation. Analyzing customer needs. Selecting and advocating for suitable technical solutions.

Completed the Full-Stack Web Development program at OpenClassrooms from Feb 2019 to Oct 2021.