Oliver Kriz
Verified Expert in Engineering
Back-end Developer
Berlin, Germany
Toptal member since July 7, 2020
Oliver is a passionate back-end engineer with a data-driven mindset of a hacker—thinking out of the box—and 15+ years of professional software development experience in over seven different industries. Oliver has an affinity for analyzing, digitalizing, and optimizing business processes and workflows. His main tech stack is PHP with MySQL or PostgreSQL—either plain or with Symfony. He's interested in smaller hourly projects in high-tech industries to expand his network and broaden his horizons.
Portfolio
Experience
- Git - 15 years
- MySQL - 15 years
- Agile Software Development - 15 years
- PHP - 15 years
- Jenkins - 13 years
- PHPUnit - 10 years
- PostgreSQL - 10 years
- Symfony - 8 years
Availability
Preferred Environment
Unix, Jenkins, Atlassian, JetBrains, PhpStorm, MacOS, Visual Studio Code (VS Code), Decentralization, Agile
The most amazing...
...thing I've developed is probably a customized A/B testing solution (and bots to help me with tedious everyday tasks like online dating).
Work Experience
Principal Software Engineer
Safetyio - MSA Safety
- Developed features for the core system API serving internal products as a user and permission management platform.
- Provided broad knowledge of IT processes, standards, and their possibilities to improve daily work for my team and overall department.
- Contributed to transformations from low deployment frequency to almost daily continuous deployments.
Principal Software Enginner
Wallstreet Online / Smartbroker
- Built and led the data/business intelligence team.
- Oversaw and orchestrated the move from on-prem data digestion to cloud computing with AWS.
- Reworked audit-proof and highly scalable data ingestion pipelines of millions of records per month.
Java Software Engineer
Deutsche Kreditbank
- Developed an internal customer-facing management application for DKB's 4+ million debit card rollout.
- Took part in architectural alignments to plan the rollout of the debit cards project.
- Worked in the core app center team, serving internal customers with many different apps for managing external customers.
Senior Software Engineer | Technical Team Lead
Foo.ag | Financial Engineering
- Created and fully integrated a continuous integration system containing unit, database, user acceptance tests, deployment tools for the quality assurance team, and automated code style reviews on each pull request.
- Designed and developed critical business units like pre-investment cost prognosis calculation and annual account statements.
- Directed and led the software development for a team of six developers, which included coordination with other teams to optimize the overall companies software quality and processes.
Lead Developer
Caterwings
- Led a cross-functional IT development team including QA, front-end, back-end, BI, and database engineers.
- Analyzed and optimized all business processes and automized repetitive and ongoing tasks.
- Planned and coordinated the new architecture of the IT stack in PHP 7.1, PostgreSQL, and Phalcon framework.
- Maintained the old legacy stack in PHP 5.6, MySQL, and Symfony 2.0 and started the migration to the new architecture.
Lead Developer
Carspring Services GmbH
- Jumped into the project as the interim CTO and took over a team of six engineers.
- Introduced BI into the tech stack, designing dashboards and defining their business requirements.
- Designed and implemented a fully autonomous marketing automation XML feed based on Facebook and Google marketing.
- Integrated with more than 25 3rd-party REST/JSON and SOAP/XML APIs for data flows (import and exports).
Experience
Technology and Development Transfer from Germany to South East Asia
Bootstrapping Lendico Germany
Education
Master's Degree in Computer Science and Media
Beuth University of Applied Science (TFH) - Berlin, Germany
Skills
Libraries/APIs
jQuery, FPDF, Node.js
Tools
PhpStorm, Git, Subversion (SVN), Jira, Jenkins, GitHub, Bitbucket, Slack, Optimizely, Visual Website Optimizer, Adobe Target, JetBrains, Atlassian, Google Analytics, Amazon Cognito
Languages
Python, PHP, HTML, JavaScript, SQL, PHP 7, XML, Java, C, C++, C#, UML, CSS, Groovy, Bash, Python 3, TypeScript
Frameworks
Symfony, PHPUnit, Codeception, Selenium, Symfony 2, PhalconPHP, Yii, Zend Framework, Spring, Koa
Paradigms
Agile Software Development, Agile, REST, Management, Business Intelligence (BI)
Platforms
MacOS, Amazon Web Services (AWS), Docker, Unix, Visual Studio Code (VS Code)
Storage
MySQL, PostgreSQL, Memcached, Redis, Elasticsearch, JSON, JSON/XML Schemas, Databases, Amazon S3 (AWS S3)
Other
OOP Designs, Back-end Development, Scraping, Domains & Hosting, APIs, API Integration, Technical Leadership, Architecture, Web Scraping, eCommerce, SOAP, People Management, Bots, Coaching, Web Crawlers, A/B Testing, Multivariate Testing, Leadership, IT Security, Server Administration, Business Coaching, Amazon RDS, Cloud Computing, Data Engineering, Decentralization, Email Automation, CTO, Social Media Apps, Full-stack
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