>cat jonas-petrik-cv.md

# Recruiter-friendly summary

Staff Engineer / Team Lead

Jonas Petrik

Staff engineer leading checkout at SCAYLE with a backend/platform focus on reliability, observability, and high-availability commerce systems. I build systems that keep working at peak load and help teams ship without creating operational drama.

13+ years of experience · Based in Germany

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selected impact

Checkout reliability and observability

At SCAYLE, I took ownership of on-call quality for a payment-critical checkout domain.

I focused on alert quality, observability, and the failure paths that were waking people up for the wrong reasons.

The result was a calmer on-call setup with more trustworthy alerts and less operational noise.

Black Friday 2025 preparation

Checkout had to stay stable through the most demanding commerce event of the year.

I helped prepare and operate the domain around peak traffic, with attention to multi-step state changes, incident response, and runtime behavior under load.

Peak tenants handled roughly 550 orders per minute during Black Friday 2025 with zero downtime in the domain I was responsible for.

anwalt.de search rebuild and platform modernization

anwalt.de needed stronger search capabilities and better foundations for future product work.

I rebuilt search around GraphQL, geolocation, aggregations, and range filters, then stepped into broader team lead and platform work.

That work improved a core marketplace experience and led into architectural, CI/CD, and mentoring responsibilities adopted across the team.

experience

Staff Engineer / Team Lead (Checkout)

SCAYLE

Apr 2025 - Present

Hamburg, Germany - Remote

Leading checkout with a backend and platform focus inside a commerce platform processing more than EUR 6.5B yearly.

highlights

  • -Led checkout through Black Friday 2025 peak tenants at roughly 550 orders per minute with zero downtime in the domain I was responsible for.
  • -Owned the cleanup of noisy monitoring and on-call signal so incidents became easier to trust, triage, and sleep through.
  • -Promoted into the lead role after pushing design docs, proposals, and reliability improvements that changed how the team operated.

scope

  • -Leading checkout execution across architecture, delivery, and operational quality.
  • -Owning on-call quality and observability for payment-critical flows.
  • -Designing pipeline-based state changes for complex checkout mutations triggered by a single user action.

PHP · Go · Laravel · Symfony · Road-Runner · FrankenPHP · Kubernetes · Docker · Redis · MySQL · AWS · Datadog · React · TypeScript · REST · Microservices · SQS · SNS · GitLab CI · PHPUnit · Jest · Cypress · Playwright · k6 · gRPC

Senior Software Engineer (Checkout)

SCAYLE

Jan 2024 - Apr 2025

Hamburg, Germany - Remote

Hands-on backend engineer on checkout, working on throughput, reliability, and multi-tenant commerce behavior.

highlights

  • -Helped rebuild checkout from a legacy implementation into a Laravel and RoadRunner architecture with clearer flow control.
  • -Took on checkout on-call, which pushed me deep into observability, error reduction, and production debugging.

scope

  • -Building and tuning high-throughput checkout flows for multi-tenant commerce.
  • -Handling incidents and runtime behavior in payment-critical systems.
  • -Contributing to headless checkout capabilities used across multiple brands.

PHP · Go · Laravel · Symfony · Road-Runner · Kubernetes · Docker · Redis · MySQL · AWS · Datadog · React · TypeScript · REST · Microservices · SQS · SNS · GitLab CI · PHPUnit · Jest · Cypress · Playwright · k6 · gRPC

Senior Software Engineer Team Lead

anwalt.de

Dec 2022 - Dec 2023

Nuremberg, Germany - Remote

Leading a small platform-oriented team while staying hands-on across backend, DevOps, and architecture for Germany's largest legal marketplace.

highlights

  • -Led a 3-person team that built foundations other teams adopted for delivery and platform consistency.
  • -Drove modernization work across database migrations, AWS infrastructure, and deployable code patterns in a legacy-heavy environment.

scope

  • -Owning delivery across backend, DevOps, and technical direction.
  • -Improving CI/CD and deployment safety with the DevOps team.
  • -Mentoring engineers and raising the quality bar through code review and shared engineering practices.

PHP · Laminas · Go · Vue.js · TypeScript · MySQL · Elasticsearch · AWS · Docker · Kubernetes · REST · New Relic · GraphQL · Bitbucket Pipelines · SQS · Logstash · Kibana · Terraform · PHPUnit · Jest · EC2 · S3 · RDS · Lambda · Bugsnag · Algolia

Senior Software Developer

anwalt.de

Dec 2020 - Dec 2022

Nuremberg, Germany - Remote

Senior backend and full-stack engineer on search and marketplace capabilities for a high-traffic legal platform.

highlights

  • -Rebuilt anwalt.de search around GraphQL, geolocation, aggregations, and range filters for a marketplace serving millions of users.
  • -Earned promotion into the lead role after owning one of the clearest technical improvement tracks in the product.

scope

  • -Building platform features and APIs used by legal professionals and consumers.
  • -Migrating legacy code into more maintainable services and flows.
  • -Implementing advanced search behavior on top of Elasticsearch.

PHP · Laminas · Vue.js · MySQL · Elasticsearch · AWS · Docker · REST · New Relic · Bitbucket Pipelines · SQS · Logstash · Kibana · Terraform · PHPUnit · Jest · EC2 · S3 · RDS · Lambda · Bugsnag · Algolia

Senior Software Engineer Team Lead

SOLUTIONLAB PRODUCTION

Jan 2018 - Dec 2020

Vilnius, Lithuania - Hybrid

Team lead and hands-on engineer for Atobi and other retail products delivered by a dev house for startup and enterprise clients.

highlights

  • -Led the migration of Atobi from a prototype stack into a Laravel API, React frontend, and mobile delivery architecture.
  • -Designed a reusable gamification system that became part of how multiple products approached engagement and calls to action.
  • -Scaled the team from 3 to 10 engineers while bridging client product vision with technical feasibility.

scope

  • -Leading the delivery team while staying hands-on with architecture and implementation.
  • -Building offline-first and real-time retail app behavior for enterprise client rollouts.
  • -Acting as the technical counterpart for a startup client that needed both execution and product-level translation.

PHP · Laravel · Phalcon · React · React Native · JavaScript · MySQL · Redis · AWS · Docker · REST · Agile · SCRUM · Redux · SQLite · OneSignal · Jenkins · Laravel Nova · Laravel Queues · Sentry · Terraform

Senior Web Developer

SOLUTIONLAB PRODUCTION

Nov 2017 - Jan 2018

Vilnius, Lithuania - Remote

Senior backend engineer on a fast-moving retail startup account inside a dev house setup.

highlights

  • -Joined to build backend services for a retail startup and moved into the lead role within two months.

scope

  • -Developing backend services and APIs for retail platform features.

PHP · Laravel · JavaScript · jQuery · MySQL · Redis · AWS · REST · Jenkins · Phalcon · Terraform

Full Stack Engineer

Olympic Casino Group Baltija

Jan 2017 - Nov 2017

Vilnius, Lithuania - On-site

Full-stack engineer on betting systems where correctness, latency, and transaction handling mattered more than brochure features.

highlights

  • -Built features for real-time betting products where financial correctness and operational discipline were non-negotiable.
  • -Worked under a stricter TDD culture than most web teams, which sharpened how I approached safety and regression risk.

scope

  • -Building and maintaining online betting product flows.
  • -Writing test-heavy code for real-time financial and account behavior.

PHP · Laravel · Vue.js · JavaScript · MySQL · Redis · Docker · REST · TDD · PHPUnit · Kubernetes · Jenkins · Bitbucket

Senior Software Engineer Team Lead

UAB inlusion Netforms

Feb 2016 - Jan 2017

Vilnius, Lithuania - On-site

Team lead for distributed delivery across ERP, CRM, and cross-platform product work for international clients.

highlights

  • -Led a distributed team of 10 engineers across ERP and CRM projects with web, mobile, and desktop delivery.
  • -Owned architecture and delivery for enterprise products that mixed product strategy, project leadership, and implementation.

scope

  • -Leading distributed engineering execution across the full project lifecycle.
  • -Architecting ERP and CRM systems while staying involved in implementation detail.

C# · .NET · PHP · Laravel · Vue.js · JavaScript · MySQL · MSSQL · Xamarin · REST · Agile · SCRUM · Yii2 · ASP.NET MVC

Senior Software Engineer

UAB inlusion Netforms

Nov 2015 - Feb 2016

Vilnius, Lithuania - On-site

Senior engineer across full-stack product work for enterprise clients.

highlights

  • -Moved from senior engineer into the lead role within roughly three months.

scope

  • -Developing full-stack web applications and APIs for enterprise client work.

C# · .NET · PHP · Laravel · Vue.js · JavaScript · MySQL · MSSQL · REST · Yii2 · ASP.NET MVC

Full Stack Engineer

UAB Integrus

Nov 2014 - Nov 2015

Vilnius, Lithuania - On-site

Full-stack engineer on warehouse and logistics systems for automotive e-commerce.

highlights

  • -Built warehouse workflow and shipping integrations for an automotive spare-parts commerce platform.

scope

  • -Developing logistics automation and internal workflow systems.
  • -Integrating external shipping providers such as DPD, DHL, and UPS.

PHP · Laravel · JavaScript · jQuery · MySQL · REST · Bootstrap · SASS

Ruby on Rails Developer

Itlogas JSC

Feb 2014 - Oct 2014

Vilnius, Lithuania - Remote

Rails developer on a campaign and voter-registration platform.

highlights

  • -Delivered full-stack Rails work for a voter registration and campaign management system.

scope

  • -Building and maintaining Rails product features end to end.

Ruby · Rails · PostgreSQL · JavaScript · REST · Capistrano · RSpec

PHP Web Developer

Profectus Novus

Apr 2013 - Feb 2014

Vilnius, Lithuania

Early-career PHP engineer working inside SharePoint-heavy enterprise and government environments.

highlights

  • -Built a government education resource-sharing platform inside a SharePoint enterprise setup.

scope

  • -Developing PHP applications integrated with SharePoint workflows and data.

PHP · SharePoint · MySQL · JavaScript · CakePHP · jQuery

education

Vilniaus Universitetas

Bachelor's degree in Software Engineering

2011 - 2015