Jobs C

We are looking for an experienced Senior C++ Engineer to work on large-scale desktop software products. The role focuses on performance optimization, stability improvements, modernization of legacy systems, and development of high-quality desktop applications.

RESPONSIBILITIES

• Develop and maintain C++ desktop application components.
• Implement multithreading and concurrency solutions.
• Analyze and resolve performance bottlenecks.
• Support modernization of legacy codebases.
• Collaborate with architecture, QA, and product teams.

• Utilize AI-assisted development tools to accelerate development and refactoring activities.

   

QUALIFICATIONS

• 5+ years of senior-level C++ development experience.
• Strong expertise in modern C++ (C++14/17/20).
• Solid knowledge of multithreading, concurrency, debugging, and performance tuning.
• Hands-on experience with Qt, CMake, Conan, MSVC, CEF integration
• Strong analytical and problem-solving skills.

WILL BE A PLUS

• Experience with AI-assisted coding tools and workflows.
• Experience in regulated software environments.
• Technical degree or equivalent practical experience.
• German language skills are a plus.

Senior C Developer (Legacy Systems / Performance Optimization)

Remote | Full-time | B2B Contract | 

We are looking for an experienced Senior C Developer to join a project focused on optimizing the performance of a legacy data processing system.

The existing platform processes large volumes of data through ETL pipelines and loads the results into a relational database (Db2). As data volumes increase, the system experiences performance degradation.

Your main responsibility will be to identify performance bottlenecks, optimize existing C code, and improve the scalability and efficiency of data processing.

We are also open to experienced C++ developers with strong C knowledge who are comfortable working primarily with C.

Responsibilities

• Analyze and optimize existing C code in a legacy production environment.
• Identify and resolve performance bottlenecks in data processing and ETL workflows.
• Improve application performance and scalability as data volumes increase.
• Work with relational databases and SQL queries.
• Optimize multithreaded and parallel processing using Intel OpenMP and related technologies.
• Investigate CPU, memory, and database performance issues.
• Maintain and improve existing system components while ensuring stability.
• Use AI-assisted development tools, including Claude, in daily engineering workflows.
• Collaborate with an international engineering team.

Requirements

• Strong commercial experience with C programming.
• Solid knowledge of C++, with readiness to work primarily in C, is also acceptable.
• Experience with performance optimization, profiling, and debugging.
• Hands-on experience maintaining or modernizing legacy systems.
• Good understanding of multithreading, concurrency, and parallel programming.
• Experience with Intel OpenMP or comparable parallel programming technologies.
• Strong SQL skills and experience with relational databases.
• Understanding of memory management and low-level application performance.
• Experience using AI coding assistants or AI-assisted development workflows.
• English B2+/C1 — confident technical communication.

Nice to Have

• Experience with IBM Db2.
• Knowledge of Embedded SQL / SQL embedded in C.
• Experience optimizing ETL or large-scale data processing systems.
• Experience with high-volume batch processing.
• Experience with performance-sensitive enterprise applications.

Project Details

• Engagement: Full-time
• Duration: Several months
• Location: Remote, excluding Russia and Belarus
• Rate: Up to $18/hour
• Start: To be discussed

Why Join?

• Work on challenging performance engineering problems.
• Optimize a production system processing growing volumes of data.
• Apply your expertise in C, concurrency, SQL, and low-level optimization.
• Work in an engineering environment using modern AI development tools.

Interested? Apply with your CV 

Project: Full-time, contract for several months

Domain: Agriculture / Genetic Data Processing

English: B2+

About the Project

We are looking for two Senior C Developers to optimize a 30+ year-old legacy system used for processing cattle genetic data.

The system handles laboratory data through ETL pipelines and stores results in Db2. With a database of approximately 13 million records, processing performance has significantly degraded.

Responsibilities

• Analyze legacy architecture and identify performance bottlenecks.

• Refactor and optimize C code.

• Improve ETL processes and large-scale data processing.

• Optimize database interactions using Db2 and Embedded SQL.

• Improve multithreaded processing with Intel OpenMP.

• Use Claude Code as the primary AI development tool.

Requirements

• Strong commercial experience with C.

• Experience with relational databases; Db2 is a plus.

• Hands-on experience with Embedded SQL and Intel OpenMP.

• Strong performance optimization skills.

• Experience working with legacy systems.

• English B2+.

• Experience in AI-first development environments and willingness to use Claude Code daily.

Nice to have: Experience modernizing legacy systems and optimizing ETL pipelines.

Conditions

• Full-time, contract for several months.

• Working hours: 12:00–21:00 or 13:00–22:00 Armenia time.

• Collaboration with the CTO, Chief Data Officer, and engineering team.

• Client based on the US East Coast.

On behalf of our client, we are looking for a C++ Developer.

About the Project:

An international trading company developing an in-house ultra-low-latency trading platform. The platform is continuously evolving with new modules, exchange connectivity, and trading capabilities, focusing on high performance and deterministic execution.

Responsibilities:

- Develop and enhance components of a high-performance, ultra-low-latency trading platform.

- Design and implement low-latency trading modules from scratch in a Linux environment.

- Optimize existing code for microsecond-level performance and deterministic execution.

- Work with high-throughput market data and order routing systems.

- Implement and maintain exchange connectivity and data feed handlers.

- Improve system architecture, performance, and scalability.

-Develop client-server data exchange systems using raw TCP/UDP and multicast protocols.

- Interface with global exchanges using FIX and SBE binary protocols.

- Collaborate with traders and engineers to deliver robust trading infrastructure.

Requirements:

- 6+ years of professional C++ development experience.

- 3+ years of experience with high-performance or low-latency systems.

- Strong knowledge of modern C++ (C++17/20 preferred) and STL.

- Deep understanding of Linux internals, multithreading, and memory management.

- Experience with multithreaded and concurrent programming.

- Proficiency in TCP/IP sockets and network protocol programming.

- Understanding of client-server architecture and distributed systems.

- Experience writing highly optimized, performance-critical code.

- Strong debugging and problem-solving skills.

Nice to Have:

- Experience with FIX protocol, including text-based FIX or binary FIX/SBE.

- Experience with multicast networking and high-performance message processing systems.

- Experience in financial markets or electronic trading systems.

- Familiarity with market data feeds and exchange connectivity.

- Knowledge of performance profiling and latency optimization.

Company offers:

- Long-term employment with possibilities for professional growth

- Fully remote work

- Reasonably flexible schedule

- 15 days of paid vacation

- Regular performance reviews

Промавтоматика (Вінниця) розробляє власне ПЗ для керування реальним залізом: приводами, контролерами, сенсорами. Шукаємо Middle-інженера, який братиме ТЗ і самостійно доводитиме його до робочого рішення. Без мікроменеджменту, але з командою поруч.

Обов'язки:

• Розробка модулів на C++ і Python за ТЗ
• Написання ROS2-нод, робота з ros2_control
• Інтеграція ПЗ з MCU, SBC і ПЛК, налаштування EtherCAT
• Тестування модулів на відповідність real-time вимогам і виправлення дефектів
• Участь у стендових випробуваннях
• Проходження код-рев'ю у Senior / Tech Lead

Очікуємо:

• 1,5–2+ роки комерційного досвіду на C++
• Впевнене володіння Python
• Досвід роботи з ROS2, зокрема з ros2_control
• Досвід роботи з hardware (MCU, SBC або ПЛК)
• Досвід роботи з EtherCAT
• Розуміння real-time систем і модульної архітектури
• Знання Git, CMake, Docker

Буде плюсом:

• URDF/xacro, MoveIt2
• Кінематика роботів і планування траєкторій
• Сервоприводи (CiA402), I/O-термінали Beckhoff
• OPC UA, Modbus TCP
• Embedded Linux
• Flutter/Dart
• Досвід у промисловій автоматизації, дронах або automotive embedded

Що пропонуємо:

• Власну зону відповідальності в системі, а не переписування чужого коду під наглядом
• Роботу з фізичними системами, де результат видно на реальному обладнанні
• Команду, у якій діляться досвідом на рівних, і код-рев'ю від сеньйорів для технічного зростання
• Офіційне працевлаштування та стабільність власного виробництва

📍 Формат роботи: офіс у Вінниці. Кандидатам з інших міст допомагаємо з релокацією, щоб переїзд до Вінниці був простим і без зайвого стресу.

Промавтоматика (Вінниця) розробляє власне ПЗ для керування реальним залізом: приводами, контролерами, сенсорами. Шукаємо Middle-інженера, який братиме ТЗ і самостійно доводитиме його до робочого рішення. Без мікроменеджменту, але з командою поруч.

Обов'язки:

• Розробка модулів на C++ і Python за ТЗ
• Написання ROS2-нод, робота з ros2_control
• Інтеграція ПЗ з MCU, SBC і ПЛК, налаштування EtherCAT
• Тестування модулів на відповідність real-time вимогам і виправлення дефектів
• Участь у стендових випробуваннях
• Проходження код-рев'ю у Senior / Tech Lead

Очікуємо:

• 1,5–2+ роки комерційного досвіду на C++
• Впевнене володіння Python
• Досвід роботи з ROS2, зокрема з ros2_control
• Досвід роботи з hardware (MCU, SBC або ПЛК)
• Досвід роботи з EtherCAT
• Розуміння real-time систем і модульної архітектури
• Знання Git, CMake, Docker

Буде плюсом:

• URDF/xacro, MoveIt2
• Кінематика роботів і планування траєкторій
• Сервоприводи (CiA402), I/O-термінали Beckhoff
• OPC UA, Modbus TCP
• Embedded Linux
• Flutter/Dart
• Досвід у промисловій автоматизації, дронах або automotive embedded

Що пропонуємо:

• Власну зону відповідальності в системі, а не переписування чужого коду під наглядом
• Роботу з фізичними системами, де результат видно на реальному обладнанні
• Команду, у якій діляться досвідом на рівних, і код-рев'ю від сеньйорів для технічного зростання
• Офіційне працевлаштування та стабільність власного виробництва
• Сучасний офіс у Вінниці
• Допомогу з релокацією для кандидатів з інших міст, щоб переїзд до Вінниці був простим і без зайвого стресу

CleverFiles is an American product company with Ukrainian roots that has been developing software for users worldwide since 2009. Our flagship product is Disk Drill, a data recovery application available for macOS and Windows.

The product helps users recover lost files, photos, documents, and other crucial data. We operate in the data recovery software niche, where quality, reliability, an intuitive interface, and user trust are of utmost importance.

Disk Drill is not the only product in the CleverFiles portfolio. We also develop Clever Cleaner, an iPhone cleaning app, Clever AI Humanizer, a tool for humanizing AI-generated content, as well as several new products currently in development.

About you:

• 3+ years of experience with C++;
• Understanding of various data serialization and data representation formats like SQLite, JSON, plist, XML, and Protobuf blobs;
• Strong ability to dissect and comprehend codebases;
• Git/GitHub;
• Foundational OS APIs;
• WinAPI for Windows;

• POSIX, Core Foundation, and Foundation for macOS.

   

What You Will Be Doing:

• Engage in reverse engineering of binary formats and various file systems;
• First, familiarize yourself and focus primarily on supporting and fixing existing codebase;
• Once feeling confident with the product’s backend, develop new features and explore other (sometimes “exotic”) file systems and data formats;
• Collaborate with the team of likeminded pro’s to optimize code for both size and speed;
• Enhance overall product performance.
   

Nice to have:

• Objective-C, Swift, and C#;
• Understanding at least one of major file systems (NTFS, FAT32, EXT4, etc.) and how they manage data;

• UI/UX experience.

   

What we offer:

• Full-time / Part-time format;
• Flexible schedule that adapts to your rhythm;
• Full freedom of action in decision-making regarding budgets and channels;
• Competitive salary;
• Fast hiring and onboarding processes;
• Health insurance and wellness bonuses;
• Quarterly bonuses for performance, innovation, and workflow improvements;
• Paid time off (PTO) and days off, with financial compensation for unused days;
• Exciting projects and challenges.