Native libraries, E2EE and WebAssembly
Developing C++ libraries for end-to-end encrypted communication, porting native code to WebAssembly, and integrating it with web, mobile and desktop applications.
Patryk Kisielewski
Software Engineer
I design and develop software with a focus on C++ libraries, end-to-end encryption, cross-platform integrations, secure code execution and automated evaluation systems.
Toruń, Poland
Engineering focus
The areas I focus on
I combine low-level programming with system design for software that must work across languages, environments and deployment models.
Secure code execution and evaluation
Systems that run untrusted code, process isolation, resource limits, automated solution evaluation, and online judge architecture.
Architecture, teaching and teamwork
Designing clear system responsibilities, leading technical projects, working with students, and sharing knowledge through classes and talks.
Featured work
Selected work
Professional, academic and team projects that represent different areas of my engineering work.
PrivMX
Professional project · Simplito
In development
A developer platform for building applications with end-to-end encrypted communication, data storage and content sharing across web, mobile, desktop and XR environments.
Key elements
- modular C++ Endpoint library
- client-side end-to-end encryption
- C++ browser integration through WebAssembly
- libraries and wrappers for multiple languages and platforms
- encrypted audio, video and screen-sharing streams
- communication, file storage and custom events
Technologies
VEM
Professional project · Simplito · CORTEX² Open Call winner
CORTEX² phase completed
Virtual Encrypted Meetings — a project enhancing the privacy and security of communication in VR environments through comprehensive end-to-end message encryption and data protection.
Key elements
- secure communication in VR environments
- end-to-end message encryption
- user data protection
- integration with a broader XR ecosystem
Technologies
VEM was selected among the 10 winning projects in the CORTEX² Open Call #2. Simplito was the project’s lead organisation and the only Polish finalist in this call.
AlgoJudge
Open source · academic and educational project
In development
An extensible platform for programming contests, courses and laboratories, built to run and automatically evaluate submitted solutions.
Key elements
- Client–Server–Runner architecture
- multiple activity types
- extensible task types
- secure code execution
- use in contests and courses
- temporary accounts for short-term activities
Technologies
Noxmap
Team project · student project
Completed · no longer developed
A configurable tool for organising map- and location-based events, including urban games, field events and orienteering.
Key elements
- participant registration
- map point configuration
- automatic answer checking
- reporting
- real-time communication
- participant safety mechanisms
Technologies
Recognised in the NCU Faculty of Mathematics and Computer Science competition in the business and social potential categories.
Professional experience
Engineering experience
From low-level code and build processes to secure cross-platform APIs, I work at the boundaries between languages, systems and execution models.
C++ libraries, E2EE and cross-platform integrations
I develop native libraries from build configuration to stable APIs and application integrations. I connect C++ with WebAssembly and web, mobile and desktop environments while working with concurrency, communication protocols and cryptographic mechanisms used in E2EE solutions.
Languages and environments
SYSTEM MAP
Technical scope
The areas I bring together when designing, developing and integrating libraries.
Build, toolchains and architectures
Configuring build processes, working with compilers and toolchains, cross-compilation, and preparing code for different systems and architectures.
Native libraries and binary contracts
Static and dynamic libraries, linking, public API design, and maintaining source and binary compatibility.
Concurrency and execution models
Native threads, pthreads, synchronisation and safe shared-state handling, complemented by Web Workers in browser environments.
Cross-environment integrations
Integration layers and bindings that expose C++ code to web, mobile and desktop applications, including Emscripten ports to WebAssembly.
Cryptography and E2EE
Symmetric and asymmetric encryption, block cipher modes, initialisation vectors, and handling keys, key pairs and shared secrets.
Protocols, data and security
Communication design, data serialisation and JSON-RPC, boundary validation, and deliberate use of third-party libraries in security-sensitive code.
Speaking & teaching
Speaking and teaching
Practical engineering knowledge shared through a technical talk and long-term project work with students.
Featured talk
Low-level libraries in modern applications
A talk delivered as a Simplito representative, focused on practical challenges in using a native C++ library from applications written in different languages and running across multiple platforms.
Talk page(opens in a new tab)Teaching
AlgoJudge project classes
Long-term project classes in which students developed an automated programming-task evaluation system, working in weekly sprints and combining requirements analysis, design, implementation, testing, automation and technical documentation.
| Course | Period |
|---|---|
| AlgoJudge | academic year 2023/2024 |
| AlgoJudge2 | academic year 2024/2025 |
The classes were made possible by the NCU “Ścieżki rozszerzone” grant under “The Excellence Initiative - Research University” (IDUB) programme.
AlgoJudge(opens in a new tab) and AlgoJudge2(opens in a new tab) courses in the NCU catalogue
About
About me
I am a Software Engineer at Simplito with a Master’s degree in Computer Science from Nicolaus Copernicus University in Toruń. In my professional work, I have developed C++ libraries for end-to-end encrypted communication, ported native code to WebAssembly with Emscripten, and built modules that support WebRTC and integrations that use it.
I have also long been interested in systems that automatically run and evaluate code. This area connects my participation in programming contests, degree projects, development of AlgoJudge and the project classes I have taught.
Beyond software development, I have been involved in academia and the local computing community: teaching project classes, preparing technical talks, leading the Noxmap team and serving as chair of The Scientific Society of Computer Science Students at NCU.
I developed my skills in algorithm design and analysis, as well as in solving complex programming problems, in part through participation in the Ministry of Science and Higher Education grant programmes Najlepsi z najlepszych! 3.0(opens in a new tab) and Najlepsi z najlepszych! 4.0(opens in a new tab) (“The Best of the Best”), which supported outstanding computer science students at the NCU Faculty of Mathematics and Computer Science competing in international programming contests.
Public profiles
Find me online
Explore my projects, code and further information about my experience on GitHub and LinkedIn.