Aleksandra Woźniak
Verified Expert in Engineering
Startups Developer
Aleksandra is an entrepreneur, engineer, and ex-startup CTO with nine years of experience working for both large corporations (Google, Elsevier, Capgemini) and start-ups. Her expertise lies in building Java back-ends for web applications and in big data technologies. Aleksandra is also a co-founder of Cleo, a virtual personal finance assistant, for which she developed natural language and financial data processing modules.
Portfolio
Experience
Availability
Preferred Environment
Git, IntelliJ IDEA, Ubuntu Linux
The most amazing...
...project I've developed is Cleo, a personal finance assistant in FB Messenger that analyses users' spending, provides tips, and answers money-related questions.
Work Experience
Co-founder and CTO
Cleo AI Ltd.
- Grew the business from 0 to tens of thousands of users in two years and raised £2.5 million for the business through private equity investors.
- Served as the sole developer for one year. I developed a web application, SMS interface, and Facebook Messenger chatbot Cleo, the company's flagship product.
- Implemented modules for analyzing a user's payment transaction history, detecting spending patterns and providing recommendations on how user's spending be optimized.
- Implemented natural language processing functionality for Cleo chatbot.
- Recruited and managed the founding engineering team. Led the technical product design and development.
- Set and executed the technical strategy for the company, aligning product engineering with business goals.
Java Developer (Big Data team)
Elsevier Limited
- Developed Hadoop jobs for aggregating and processing sales data from various business units of Elsevier and creating financial reports.
- Designed and prototyped central big data processing system for Elsevier, enabling access and processing functionalities for data sets across different departments.
- Gathered requirements and performed estimations of the internal big data processing system.
Java/Full-stack Developer
Geonomics Global Games
- Planned, designed, and implemented data aggregation and financial reporting software for a global map-based lottery game platform.
- Maintained and enhanced the game's financial reporting and data aggregation modules.
- Implemented registration and payment flow for the mobile version of GeoLotto game.
- Designed and implemented a custom content management system for the game's website.
- Introduced the domain-driven design paradigm to the development process, performed a thorough review of the codebase, and created a refactoring plan to transform the initial domain model into a more expressive one.
Chief Architect's Technical Assistant/Software Developer Intern
Hadapt Polska Sp. z o. o.
- Investigated and tested new approaches to extend Hadapt's flagship product, a big data analytics platform that integrates SQL with Hadoop.
- Prototyped new approaches to integrate text indexing with the platform, using Apache Lucene and Apache Solr. Tested the prototypes for performance.
- Created end-to-end test architecture for Hadapt platform. Designed and implemented a suite of stress and scalability tests.
- Managed team of three testers.
Software Developer Intern
Google Switzerland GmbH
- Implemented usability enhancing features for Google Flight Search and Google Hotel Finder.
- Introduced new search types for Hotel Finder: searching by hotel name and searching by address.
- Implemented an optimisation algorithm for efficient label placement on the Google Flights map.
Software Developer Intern
Capgemini Polska Sp. z o. o.
- Tested an interface and behavior of an application for a leading logistics company.
Java Web Developer
Wspólny Rynek Medyczny Sp. z o. o.
- Implemented an internationalization feature for rynekmedyczny.pl -- an online database of Polish medical institutions.
- Prepared mechanisms for transforming rough XML data of medical institutions into HTML documents.
Experience
Teaching Java Professionally
Skills
Languages
Java, Ruby, SQL, HTML, Bash, XSLT, XML, CSS, JavaScript, HTML5, SCSS, CSS4, Python
Frameworks
Spring, Hibernate, Spring MVC, JUnit, Ruby on Rails (RoR), Hadoop, Apache Spark, Google Web Toolkit, Guice, Spark, Apache Wicket
Tools
IntelliJ IDEA, Git, Apache Maven, GitHub, Gradle, Perforce, Subversion (SVN), HP Quality Center (QC), Apache Ant, Apache Solr
Paradigms
Test-driven Development (TDD), Unit Testing, Refactoring, Dependency Injection, Pair Programming, Kanban
Other
Startups, Code Review, Lean Startups, Fintech, Big Data, SOLID Principles, Chatbots, Data Processing, Domain-driven Design (DDD)
Libraries/APIs
Facebook Messenger API, Cocoon, Spring REST, jQuery, Apache Lucene
Platforms
Amazon Web Services (AWS), Heroku, Ubuntu Linux, Docker, Eclipse, Linux
Storage
PostgreSQL, Relational Databases, Apache Hive
Education
Master of Science Degree in Computer Science
University of Wrocław - Wrocław, Poland
Bachelor of Science Degree in Mathematics
University of Wrocław - Wrocław, Poland
Bachelor of Science Degree in Information Technology
Poznań University of Technology - Poznań, Poland
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring