Oliver Kriz, Developer in Berlin, Germany
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Oliver Kriz

Verified Expert  in Engineering

Back-end Developer

Location
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

Safetyio - MSA Safety
JavaScript, Node.js, Koa, PostgreSQL, Amazon Web Services (AWS), APIs...
Wallstreet Online / Smartbroker
Python, Python 3, PostgreSQL, Amazon S3 (AWS S3), Amazon RDS, Cloud Computing...
Deutsche Kreditbank
Java, Spring, APIs, API Integration, Architecture, Full-stack

Experience

Availability

Part-time

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

2023 - PRESENT
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.
Technologies: JavaScript, Node.js, Koa, PostgreSQL, Amazon Web Services (AWS), APIs, API Integration, Architecture, Python, Amazon Cognito, TypeScript, Full-stack

Principal Software Enginner

2022 - 2023
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.
Technologies: Python, Python 3, PostgreSQL, Amazon S3 (AWS S3), Amazon RDS, Cloud Computing, Data Engineering, Business Intelligence (BI), APIs, API Integration, Technical Leadership, Architecture, Leadership, Web Scraping, Scraping

Java Software Engineer

2020 - 2022
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.
Technologies: Java, Spring, APIs, API Integration, Architecture, Full-stack

Senior Software Engineer | Technical Team Lead

2017 - 2020
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.
Technologies: Bash, Unix, MacOS, Jenkins, Groovy, Python, JavaScript, PostgreSQL, PHP, APIs, API Integration, Technical Leadership, Architecture, Leadership, Full-stack, Web Scraping, Scraping

Lead Developer

2017 - 2017
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.
Technologies: Symfony, PhalconPHP, Bash, Unix, MacOS, Jenkins, PostgreSQL, MySQL, JavaScript, Python, PHP, Email Automation, APIs, API Integration, Technical Leadership, Architecture, CTO, Leadership, Full-stack, Web Scraping, Scraping

Lead Developer

2015 - 2017
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).
Technologies: Symfony, PhalconPHP, Bash, Unix, MacOS, Jenkins, PostgreSQL, MySQL, JavaScript, Python, PHP, Email Automation, APIs, API Integration, Technical Leadership, Architecture, CTO, Social Media Apps, Leadership, Full-stack, Web Scraping, Scraping

Technology and Development Transfer from Germany to South East Asia

I handled the project and software development migration from Berlin to Singapore, which included building up and training the IT department and working as a consultant to ensure common best practices were applied. We brought the code and knowledge to Singapore and the technology culture as well.

Bootstrapping Lendico Germany

http://www.lendico.de
I handled this project from scratch to delivery in three months. This included planning, developing, and launching the peer-to-peer credit platform Lendico Germany. Lendico was an enormously successful venture under the accelerator Rocket Internet and was later sold to ING bank.

Languages

Python, PHP, HTML, JavaScript, SQL, PHP 7, XML, Java, C, C++, C#, UML, CSS, Groovy, Bash, Python 3, TypeScript

Tools

PhpStorm, Git, Subversion (SVN), Jira, Jenkins, GitHub, Bitbucket, Slack, Optimizely, Visual Website Optimizer, Adobe Target, JetBrains, Atlassian, Google Analytics, Amazon Cognito

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

Frameworks

Symfony, PHPUnit, Codeception, Selenium, Symfony 2, PhalconPHP, Yii, Zend Framework, Spring, Koa

Libraries/APIs

jQuery, FPDF, Node.js

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)

2010 - 2012

Master's Degree in Computer Science and Media

Beuth University of Applied Science (TFH) - Berlin, Germany

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