Senior C++ Developer

We are seeking a Senior C++ Developer to design, optimize, and maintain high-performance Microsoft Office COM Add-Ins, with a focus on scalability, real-time data processing, and seamless user experience within Excel. Responsibilities Develop, maintain, and optimize Microsoft Office COM Add-Ins on Windows using C++ and JavaScript (NodeJS)Analyze performance bottlenecks in handling large datasets, such as 50k+ formulas or real-time data streams, and implement optimization strategiesApply best practices and innovative solutions to improve the scalability, speed, and usability of the add-inCollaborate with the team to design and implement new features for the COM Add-In application, and ensure thorough testing and quality assuranceConduct detailed performance analysis, including profiling and debugging, and propose solutions to enhance stability and speedWork on real-time data integration and ensure efficient handling of high-frequency updatesCommunicate technical solutions effectively to internal stakeholders and external clientsEngage in technical discussions, gather requirements, and ensure alignment between development and business goalsParticipate actively in a distributed team environment, and leverage remote collaboration tools to stay connected and productive Requirements 5+ years of experience with C++ programming, particularly for developing and maintaining COM Add-InsExperience with JavaScript, particularly for client-side scripting and enhancing user interactivity within ExcelUnderstanding of Microsoft Office APIs and the architecture for COM Add-In development, especially in ExcelDemonstrated experience handling large datasets, formula-heavy spreadsheets, and/or real-time data processingProven ability to optimize performance, improve scalability, and enhance responsiveness in applications dealing with substantial workloadsExperience with debugging, profiling tools, and performance tuning, with specific experience analyzing Excel-related performance highly desirableKnowledge of asynchronous programming and multi-threading techniques to handle real-time data updatesExcellent analytical and problem-solving skills combined with a proactive approach to identifying and solving issuesStrong verbal and written communication skills with the ability to explain complex technical concepts to both technical and non-technical stakeholdersExperience working effectively in distributed teams using collaboration toolsProficiency in English at a B2+ level Nice to have Background in financial services, fintech, or a similar domain involving large-scale data and formula-heavy computationsFamiliarity with advanced Excel functionalities, such as VBA macrosKnowledge of integrating real-time data streams, such as from APIs or external trading systems, into Microsoft Office Add-InsProficiency with version control systems such as Git and experience implementing CI/CD pipelines for deploymentFamiliarity with Web technologies used in Office Add-Ins, including Office.jsKnowledge of best practices for usability, testing, and debugging in distributed applications We offer We gather like-minded people:Top tech minds driving innovation in AI, cloud and digital platform modernizationSupportive team and agile, startup-like cultureHybrid by design mode and opportunity to work remotely within PolandChance to work abroad for up to 60 days annuallyBusiness-driven relocation opportunitiesWe provide growth opportunities:Career development programsThought leadership, mentoring, soft skills and well-being programsCertification (Anthropic, Gemini, GCP, Azure, AWS)English classesWe cover it all:Stable payParticipation in the Employee Stock Purchase Plan with a 15% discountBenefits package (health insurance, multisport, shopping vouchers)Referral bonuses up to $2,000Offices featuring entertainment and relaxation zones, table tennis and football, free snacks, coffee and moreCorporate, social and well-being eventsPlease, note:Benefits listed above are available to employees onlyWe are open for working with Contractors. Terms of B2B cooperation agreements are agreed individuallyWe will reach out to selected candidates exclusively EPAM is global leader in AI transformation engineering and integrated consulting, serving Forbes Global 2000 companies and ambitious startups. With over thirty years of expertise in custom software, product and platform engineering, we empower our clients to become AI-Native enterprises, driving measurable value from innovation and digital investments.