Open to opportunities

Karl Tann

@karltann

Message

Senior Full Stack Engineer specializing in PHP/Symfony and cloud-native systems.

Estonia

Message

What I'm looking for

I am looking for a senior engineering role where I can build scalable, cloud-native systems, apply best practices (TDD, CI/CD), mentor engineers, and deliver measurable business impact in a collaborative, outcome-driven team.

I am a Senior Full Stack Engineer with over 10 years of experience designing and delivering scalable, secure, high-performance web applications across retail, logistics, and food delivery domains. I specialize in PHP/Symfony, with selective exposure to Laravel, and I integrate React and Angular front-ends to deliver end-to-end solutions.

I've engineered high-traffic Symfony APIs that supported millions of users with 99.9% uptime, integrated AI-driven features to improve operational efficiency, and optimized systems with caching, query tuning, and monitoring to measurably reduce response times and deployment errors. I automate CI/CD pipelines, deploy containerized services on AWS/GCP, and apply TDD, SOLID, and clean architecture practices.

I mentor engineers, drive adoption of best practices, and collaborate cross-functionally to deliver business impact—improving delivery efficiency, reducing inventory waste, and increasing operational visibility through dashboards and integrations. I seek to build reliable, observable platforms that scale and deliver measurable outcomes.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

Wolt

Nov 2023 - Present (2 years 7 months)

Engineered Symfony-based APIs supporting 2M+ users with 99.9% uptime, integrated AI courier prediction improving delivery efficiency by 15%, and reduced deployment errors by 40% through CI/CD automation.

PHP Symfony Laravel React Docker Kubernetes GitHub Actions Redis WebSockets

Senior Full Stack Developer

Picnic

Jul 2020 - Oct 2023 (3 years 3 months)

Built Symfony microservices and React dashboards for grocery logistics, increasing warehouse efficiency by 20% and reducing inventory waste 12% via AI demand forecasting.

Symfony React AWS ECS Terraform Docker Elasticsearch PHPUnit Cypress GitHub Actions

Full Stack Developer

Rimi Eesti

Oct 2016 - Apr 2020 (3 years 6 months)

Developed Symfony backends handling 500k+ daily transactions and Angular dashboards, improving reporting accuracy 30% and reducing deployment times by 50% via CI/CD automation.

Symfony Laravel Angular PostgreSQL Redis CI CD Docker REST GraphQL

Web Developer

Civitta

Aug 2010 - Sep 2016 (6 years 1 month)

Delivered custom Symfony solutions and AngularJS front-ends for clients across sectors, reducing project setup time 30% with reusable bundles and lowering defect rates by 35% through testing.

Symfony AngularJS PHP MySQL PHPUnit Behat Docker Jenkins