{"id":3453954,"url":"https://alion.io/job/hanna-robulets-company-senior-c-developer","title":"Senior C Developer","company":{"id":4485899,"name":"Hanna Robulets Company","domain":"hr-hanna.com","url":"https://alion.io/company/hanna-robulets-company","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Ukraine"],"countries":["UA"],"hiring_countries":["UA"],"hiring_countries_total":1,"salary":{"min":2500,"max":3000,"currency":"USD","period":"month","gross":false,"usd_annual":36000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Claude","optional":false},{"name":"Db2","optional":false},{"name":"ETL/ELT","optional":false},{"name":"OpenMP","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-10-26T17:22:58Z","employer_posted_date":null,"last_verified_at":"2026-10-26T17:22:58Z","board_verified":false,"closed_at":null,"days_open":15,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":15},"description":"Senior C Developer (Legacy Systems / Performance Optimization)\n\nRemote | Full-time | B2B Contract | \n\nWe are looking for an experienced Senior C Developer to join a project focused on optimizing the performance of a legacy data processing system.\n\nThe 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.\n\nYour main responsibility will be to identify performance bottlenecks, optimize existing C code, and improve the scalability and efficiency of data processing.\n\nWe are also open to experienced C++ developers with strong C knowledge who are comfortable working primarily with C.\n\nResponsibilities\n\nAnalyze and optimize existing C code in a legacy production environment.\n\nIdentify and resolve performance bottlenecks in data processing and ETL workflows.\n\nImprove application performance and scalability as data volumes increase.\n\nWork with relational databases and SQL queries.\n\nOptimize multithreaded and parallel processing using Intel OpenMP and related technologies.\n\nInvestigate CPU, memory, and database performance issues.\n\nMaintain and improve existing system components while ensuring stability.\n\nUse AI-assisted development tools, including Claude, in daily engineering workflows.\n\nCollaborate with an international engineering team.\n\nRequirements\n\nStrong commercial experience with C programming.\n\nSolid knowledge of C++, with readiness to work primarily in C, is also acceptable.\n\nExperience with performance optimization, profiling, and debugging.\n\nHands-on experience maintaining or modernizing legacy systems.\n\nGood understanding of multithreading, concurrency, and parallel programming.\n\nExperience with Intel OpenMP or comparable parallel programming technologies.\n\nStrong SQL skills and experience with relational databases.\n\nUnderstanding of memory management and low-level application performance.\n\nExperience using AI coding assistants or AI-assisted development workflows.\n\nEnglish B2+/C1 — confident technical communication.\n\nNice to Have\n\nExperience with IBM Db2.\n\nKnowledge of Embedded SQL / SQL embedded in C.\n\nExperience optimizing ETL or large-scale data processing systems.\n\nExperience with high-volume batch processing.\n\nExperience with performance-sensitive enterprise applications.\n\nProject Details\n\nEngagement: Full-time\n\nDuration: Several months\n\nLocation: Remote, excluding Russia and Belarus\n\nRate: Up to $18/hour\n\nStart: To be discussed\n\nWhy Join?\n\nWork on challenging performance engineering problems.\n\nOptimize a production system processing growing volumes of data.\n\nApply your expertise in C, concurrency, SQL, and low-level optimization.\n\nWork in an engineering environment using modern AI development tools.\n\nInterested? 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