Piotr K. - Senior Software Engineer

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Munich, Germany

Experience

Aug 2024 - Apr 2025

9 months

Zürich, Switzerland

Senior Software Engineer

On

Built a set of backend event-driven micro-services acting as middleware between various external systems and company ERP (Dynamics D365)
Defined new standards for REST API communication and architecture
Improved system robustness, fallback, and error recovery strategies
Implemented ESLint and improved TypeScript strictness to increase code readability and cleanliness
Communicated with all stakeholders and legacy system owners
Modernized tech stack
Ran planning meetings and other SCRUM rituals
Implemented continuous deployment pipeline which cut go-to-market from months to days and minutes
Redesigned backend architecture, limiting error rate, improving observability, and increasing development speed

Feb 2024 - Jun 2024

5 months

London, United Kingdom

Lead Software Engineer

Checkatrade

Designed API standards and a set of REST and Async APIs
Built a set of backend micro-services forming core platform for new end-to-end offering
Converted user stories into technical requirements
Communicated with all stakeholders and legacy system owners
Introduced shared types and SDK packages to speed up cross-team development, increase code reuse, decrease duplication, and improve quality
Delivered beta and MVP apps on time despite tight deadlines

Aug 2020 - Mar 2023

2 years 8 months

Hamburg, Germany

Lead Software Engineer

Engel & Völkers

Built a single-page application in React allowing agents to report deals and calculate commissions
Worked on UX/UI flows for franchise partners and accountants
Built a REST API using Node.js, TypeScript, and PostgreSQL deployed via Docker into a Kubernetes cluster on Google Cloud Platform
Migrated initial prototype from JavaScript to TypeScript
Created a CI/CD pipeline using GitLab
Hired new team members
Delivered the project on time with zero-error rate and great feedback: "The new app is clean and easy to use. We didn’t need any training. Works 100x better than the tools we must use now."
Designed and implemented advanced algorithms reducing user errors and ensuring accurate fee collection, improving operational efficiency and revenue assurance

Apr 2020 - May 2020

2 months

Dubai, United Arab Emirates

Senior Software Engineer

InterJoin Ltd

Built a Next.js React single-page application with partial static and server-side rendering for SEO optimization
Integrated with open APIs for mocking profile data
Built Node.js backend in TypeScript using MongoDB
Created continuous deployment pipeline using Vercel

Feb 2020 - Mar 2020

2 months

Berlin, Germany

Lead Software Engineer

COMATCH

Built a REST API microservice in TypeScript to extract and analyze text from LinkedIn-exported CV PDFs and convert to machine-readable JSON
Set up continuous integration using CircleCI
Configured deployment using AWS API Gateway and Lambda
Led a small team of two developers

Oct 2019 - Sep 2020

1 year

Berlin, Germany

Senior Software Engineer

Zalando Lounge

Built a React frontend with a Node.js REST API backend using TypeScript and PostgreSQL
Implemented a service to retrieve and convert Apple App Store Connect analytics data for the data team
Created and optimized mass marketing emails in Salesforce Marketing Cloud
Managed deployments and infrastructure in AWS with Kubernetes

Apr 2019 - Sep 2019

6 months

Berlin, Germany

Senior Software Engineer

Daimler FleetBoard

Built Node.js backend collecting data from mobile app, SOAP listener, and Azure Event Hub, persisting to PostgreSQL and forwarding to data science platform
Developed an Angular 8 single-page application displaying geo-position and coupling status over HERE Maps
Managed deployments and infrastructure in Azure DevOps and Azure with Kubernetes

Feb 2018 - Mar 2019

1 year 2 months

Berlin, Germany

Front-end Lead

Körber Digital

Led a team of 4 front-end engineers to build single-page applications in React.js displaying live analytics for production line operators and managers
Worked on UX/UI flows to enhance user experience
Assisted with backend development in JavaScript-based serverless architecture on AWS
Managed deployments and infrastructure in CircleCI with AWS or Azure
Hired new team members

Oct 2017 - Jul 2018

10 months

Berlin, Germany

Senior Software Engineer

GoEuro

Built Node.js backend services for search, routing, and booking
Implemented PDF ticket printing as a server-side React app in Node.js
Managed deployments and infrastructure in Kubernetes

Jun 2017 - Sep 2017

4 months

Berlin, Germany

Senior Software Engineer

SatoshiPay

Built micro-payments widgets and backend services in Node.js
Integrated new payment providers (IOTA, Stellar) and PayPal payments

Sep 2016 - Sep 2017

1 year 1 month

Berlin, Germany

Senior Software Engineer

Zalando

Built a React component library used across the company for consistent UX/UI development
Applied refreshed UI designs for main parts of the Shop application fetching data from headless CMS

Mar 2016 - Aug 2016

6 months

Lead Software Engineer

Toptal

Developed front-end and mobile applications
Converted websites to support responsive design
Performed bug fixes

Sep 2015 - Sep 2016

1 year 1 month

Berlin, Germany

Senior Product Owner

SmartLaw

Developed new product ideas to increase user base
Refactored existing functionalities to increase conversion
Implemented a notification system to reengage users
Redesigned interactions for better UX and satisfaction
Managed backlog and prioritized features and bug fixes

Jun 2015 - Oct 2015

5 months

Senior Front-end Software Engineer

Smava

Developed front-end application using Backbone.js
Refactored existing code for readability, testability, and performance
Converted parts of the site to responsive design
Fixed compatibility issues across browsers and platforms
Introduced Grunt-based pipeline for front-end resources and performance optimizations

Jul 2012 - Apr 2015

2 years 10 months

Berlin, Germany

Product Owner and Technical Lead

HERE, a Nokia business

Defined product scope and technical architecture for internal crowdsourcing localization headless CMS (Izumi)
Managed a small development team in Berlin and Atlanta
Developed full-stack in Ruby on Rails with MySQL, HTML5, SASS, and JavaScript
Invented crowd-sourced localization headless CMS and implemented across the company
Automated localization process, shortening cycles from weeks to minutes

Nov 2011 - Dec 2012

1 year 2 months

Berlin, Germany

Product Owner and Technical Lead

Nokia business

Defined product, design, and development for analytics dashboard displaying KPIs for Nokia products
Led development and delivery team
Increased team engagement and improved work results through KPI awareness

Aug 2009 - Jun 2012

2 years 11 months

Berlin, Germany

Senior Development Manager

HERE (formerly Ovi Maps and Nokia Maps)

Mentored a web frontend team of 28 developers
Responsible for overall web architecture of Nokia Maps
Led integration with other Nokia services
Monitored and improved performance, reducing initial load time from 30s to <6s
Recruited for development department
Architected and led migration from Nokia Maps to HERE in secret
Improved cross-team cooperation via continuous integration and weekly tech talks
Enhanced build and release process to deploy each sprint
Designed and implemented SEO strategy, increasing pages indexed from thousands to millions

Dec 2007 - Jun 2009

1 year 7 months

London, United Kingdom

Director of Research & Development

Where Are You Now? Ltd

Hired and led development (16 developers, 7 testers) and R&D (2 architects, 3 designers) teams
Mentored individuals to achieve goals
Collaborated on new product developments with UK business owners
Prepared technical documentation and supported complex database (T-SQL) optimizations
Integrated partner services (SIM card, geo-location, white labeling, credit card, booking)
Investigated new technologies for web 2.0 initiatives
Clustered backend database to solve performance issues
Improved template processing mechanism, speeding development
Prepared multilingual interface and redesigned website, resulting in traffic growth
Co-authored mobile site and new features like "What You Up For"

Jan 2006 - Nov 2007

1 year 11 months

London, United Kingdom

Development Manager

Where Are You Now? Ltd

Hired and managed a development team of 12 and 3 testers
Mentored team and led development process, writing critical system parts
Solved complex technical issues and optimized stored procedures
Prepared and released new versions
Collaborated on partner integrations
Established Polish branch with unique atmosphere
Maintained dynamic development securing rapid website growth
Introduced SVN & TRAC and brainstorming sessions to boost productivity
Organized social events and knowledge-sharing initiatives

Jul 2005 - Jan 2006

7 months

Senior Software Engineer and Team Leader

thecareermole.com

Developed the first version of the website per business specs
Built and managed a team of 3 developers and 1 graphic designer
Managed releases and testing
Delivered project on time and met business requirements

Sep 2004 - Dec 2005

1 year 4 months

Szczecin, Poland

Senior Software Engineer

Where Are You Now? Ltd

Developed frontend (HTML, CSS, JavaScript) and backend (VB6, T-SQL) for a social network
Co-authored core mechanisms and invitation via contact import, growing user base from 45k to 1.5M
Built a web-based instant messenger in pure HTML and JavaScript

Sep 2003 - Jun 2004

10 months

Szczecin, Poland

Teacher

Maius College

Gave lectures and led lab classes on databases
Taught relational databases and SQL using PostgreSQL

Sep 2001 - Feb 2002

6 months

London, United Kingdom

Software Engineer

Mole Resourcing Ltd

Developed version 2.0 of a Windows desktop application for air conditioning cost calculations in Delphi and dBase
Performed testing and bug fixing

Oct 2000 - Jun 2004

3 years 9 months

Szczecin, Poland

Teacher

Szczecin University of Technology

Taught courses on Introduction to Computer Science, Databases and SQL, RDBMS, Software Engineering, and Office Applications
Organized a dedicated PostgreSQL server for students
Led a Java application contest and introduced HTML and JavaScript classes
Taught first-year BSc students before completing MSc

Maintainer/Contributor

Open Source

Faker.js since 2022: Maintainer generating massive fake data for testing
RVM since 2016: Maintainer of Ruby environment manager
Config since 2014: Sole maintainer of Ruby gem for multi-environment YAML settings
Can I use 2015: Contributor to browser support tables

Summary

A highly motivated and proactive software engineer who is instinctively entrepreneurial. Agile evangelist. Strong personality and leadership abilities. Experienced in managing international and distributed teams. Open-minded and bright individual, with outstanding technical skills and over 25 years of experience in web development, performance optimization, and architecture design. Lives and breathes software development. Open Source and community-driven societies believer. Interested in psychology, usability, and slick user interface design.