Tomasz Posłuszny
Verified Expert in Engineering
Back-end and Embedded Systems Developer
Tom began his career as a developer of native middleware on embedded Linux systems at Samsung. He learned how software systems are built, from operating system layers to user-facing applications. Recently, he has been engaged in data engineering and back end development for the investment banking sector. Tom is also an enthusiast of good software architecture.
Portfolio
Experience
Availability
Preferred Environment
Shell Scripting, Visual Studio Code (VS Code), Microsoft Visual Studio
The most amazing...
...solution I have implemented is a highly scalable service that's responsible for distributing permissions across an organization.
Work Experience
Lead Chromium Developer
Skyrocket Tech Inc
- Managed tasks in Jira. Grouped tasks in epics for different domains and phases of development. Relied on the Agile methodology with lots of communication, progress presentations, and short release cycles. Ran weekly meetings, presenting work progress.
- Set up a framework for managing a Chromium-based browser with swift updating to the newest Chromium version (Chromium rebasing).
- Added automation scripts for building, testing, and deploying the Chromium-based browser. Set up GitHub Actions for continuous integration.
- Set up automated updates using an update server and multiple application version channels (dev and production for Windows and macOS).
- Rebranded Chromium: replaced strings, links, and any image resources containing branding.
- Implemented numerous UI/UX improvements and additions using a mix of native and WebUI components.
- Implemented improvements around web content loading and lifecycle.
Software Engineer
Goldman Sachs
- Designed and implemented a new scalable version of a REST service which improved throughput by over 500%.
- Implemented a full CI/CD pipeline on GitLab. Implemented unit tests with 91% coverage, separated integration and system tests, and introduced fully automated deployment with Kubernetes and Docker integration to the development environment.
- Wrote Dockerfiles to build container images and implemented multi-environment Kubernetes deployment configurations.
- Improved service monitoring with the addition of white-box metrics using Prometheus.
Lead Software Engineer
Beestripe, LLC.
- Customized the Chromium browser to provide a unique internet browsing experience under a new brand called Bright Browser.
- Integrated an auto-update software with Chromium to provide seamless software updates for Windows and Mac.
- Customized the Omaha client, an auto-update software for Windows. I also developed an installer for Bright Browser.
- Integrated the Sparkle project, an auto-update component for macOS.
- Designed and led the implementation of the Chromium upgrade process to stay up-to-date with the most recent Chromium-stable version.
- Set up and optimized the Bright Browser build and deployment process from the technical side.
- Integrated the Omaha server written in Django with client-side auto-update components.
Back-end Developer
Goldman Sachs
- Designed and implemented an authentication system.
- Designed and implemented user management and user settings microservices.
- Supported the platform for the pricing and trading of structured financial products.
- Implemented REST API for brokerage firms to provide information about offered structured products.
- Supported software development by doing code reviews, maintaining continuous integration, and a local deployment profile.
- Oversaw deployment configuration and set up using in-house and cloud technologies. Performed production releases.
- Implemented Kafka Streams applications to combine, enrich and process financial data in real-time with low latency and high throughput.
Software Engineer
Vewd (Formerly Opera TV)
- Supported the integration of an embedded Linux platform for Smart TVs.
- Assisted with the SDK for Smart TVs, which provided HTML5 rendering.
- Oversaw the SDK integration with an OpenGL back end on specific Smart TV platforms and models.
- Debugged obfuscated JavaScript code of Smart TV apps.
- Designed and implemented SDK integration tests in Python.
- Implemented specific SDK functions as per client needs.
- Participated in the recruitment process as the technical interviewer.
Software Engineer | Computer Vision Specialist
DevPeer
- Researched and improved a line segment detection algorithm in C++ using OpenCV core (client: http://www.geomagical.com/).
- Designed and implemented a simple image search engine in Python using OpenCV.
- Developed photo background removal tool in Python using OpenCV.
- Created relative 360 camera pose estimation algorithm for virtual tours application (client: http://www.vizlifes.com/) using C++ and RANSAC algorithm.
Junior Software Engineer
Samsung Electronics
- Participated in developing voice UI control middleware for the Tizen mobile platform.
- Assisted in the development of a web browser for Tizen Smart TV. Implemented logic for managing multiple tabs and Native UI elements, to name a few.
- Participated in implementing software development processes and process requirements.
- Created and presented project and patent proposals to the client.
- Conducted technical training on Enlightenment Foundation libraries.
Experience
GSMarkets
https://drive.google.com/file/d/1h-Raanj5lyzu12CiwpdKyRDEVu9h1ZV9/view?usp=sharingMy responsibilities included supporting the design and implementation of the microservices platform and building authentication and user management microservices, which enabled user experience personalization.
I helped to build assets and prices streaming microservices to process and deliver hundreds of thousands of financial data messages within seconds. I have supported the implementation of the monitoring system (metrics, request tracing), which helps find anomalies and bugs quickly and improve performance.
I also supported the deployment configuration, which included packaging, package delivery, deployment scripts, network configuration, scaling, and database sharding.
Automated Trading Solutions
• backtester in C++
• trading bot in C++
• real-time data collector in C++
• ETL jobs in Python
• data analysis and visualization in Python
• scripts for managing "data lake" in S3
Image Annotation Tool
https://drive.google.com/file/d/15MQQAF0x2ANpe2ay7X68ezSslBd8iavm/view?usp=sharingDesign and Implemented an Extraction Process
While working on the project, I contributed to OpenCV and fixed the MOG2 algorithm implementation. The extraction process involved moving objects in videos.
Posłuszny, Tomasz, and Barbara Putz. "An Improved Extraction Process of Moving Objects' Silhouettes in Video Sequences." Advanced Mechatronics Solutions. Springer International Publishing, 2016. 57-65.
(See list of contributors here: https://opencv.org/opencv-3-0/)
Bright Browser
https://github.com/google/omaha
https://github.com/omaha-consulting/omaha-server
https://sparkle-project.org/
I designed and implemented a process for syncing with upstream Chromium major releases. I also developed and documented build and release processes. I implemented minor browser customizations and features.
RocksDB Development (on Behalf of Evolved Binary, Ltd.)
https://github.com/facebook/rocksdb/commits/master?author=alucardedI added event listeners to RocksJava, which allows better monitoring and control of RocksDB internal operations. I also implemented multiple JNI benchmarks to optimize getting DB values via RocksJava, founding some approaches to be faster in certain scenarios.
Skills
Languages
Java, Java 8, C++, Python, HTML, JavaScript, Bash, HTML5, C, Python 3, C++17, GraphQL, SQL, CSS, XML, Java 11, C++11, Python 2, TypeScript
Libraries/APIs
REST APIs, Pandas, JAX-RS, NumPy, OpenCV, React, Interactive Brokers API, Scikit-learn, Visual Studio SDK, Node.js
Tools
IntelliJ IDEA, Apache Maven, Git, GitLab CI/CD, Kafka Streams, CMake, GitLab, Apache JMeter, AWS Glue, Amazon Elastic MapReduce (EMR), Amazon EBS, Amazon Elastic Container Registry (ECR), AWS ELB, AWS IAM, AWS Key Management Service (KMS), Amazon Simple Queue Service (SQS), Amazon Simple Email Service (SES), AWS Fargate, Amazon CloudWatch, AWS CloudTrail, Amazon Elastic Container Service (Amazon ECS), Makefile, Subversion (SVN), Microsoft Visual Studio, JSX
Paradigms
REST, Unit Testing, Continuous Integration (CI), Microservices, Object-oriented Programming (OOP), Scalable Application, Agile Software Development, Test-driven Development (TDD), MVC Design, E2E Testing, Waterfall Development, ETL
Platforms
Linux, Amazon Web Services (AWS), Apache Kafka, Docker, Windows, Amazon EC2, Kubernetes, JVM, Visual Studio Code (VS Code), Android, Tizen, AWS Lambda, Windows UI, MacOS
Storage
MongoDB, Spring Data MongoDB, Elasticsearch, NoSQL, Amazon S3 (AWS S3), Amazon EFS
Other
Chromium, APIs, Back-end, Proof of Concept (POC), HTTP, Software Architecture, Software Design, Data Engineering, Computer Vision, Machine Learning, Minimum Viable Product (MVP), Architecture, Startups, Software Project Management, ChatGPT, Chrome Extensions, Amazon API Gateway, Amazon Kinesis, Amazon FSx for Lustre, Streaming, Video Streaming, Leadership, Full-stack, Shell Scripting, OAuth, OANDA API, Technical Leadership, Big Data, Robot Operating System (ROS), Algorithms, Objective-C++, GitHub Actions, OpenAI GPT-4 API
Frameworks
Spring Boot, JUnit, Django, Spring, Jersey, OAuth 2, Google Test, Redux, Boost, JSON Web Tokens (JWT), .NET, JNI, JMH, Play Framework, Vert.x, Windows PowerShell, Electron
Industry Expertise
Banking & Finance
Education
Master's Degree in Robotics
Warsaw University of Technology - Warsaw, Poland
Certifications
AWS Certified Solutions Architect – Associate
Amazon Web Services (AWS)
PRINCE2® Foundation Certificate
PeopleCert
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