OPTIVEUM sp. z o.o.

Develop and maintain scalable full-stack web applications, collaborate with cross-functional teams, and contribute to architecture and code quality. | Requires 5+ years in .NET and C#, React and TypeScript experience, Azure cloud skills, and SQL Server expertise, which are beyond your current experience. | About Optiveum and our Client Optiveum is a boutique talent advisory firm. We help our clients build high-performance technology teams that move the needle. We are currently looking for a Senior FullStack .NET Developer for our client—a fast-growing US-based leader in the Financial Technology sector. With a major engineering hub in Warsaw, they are blending American innovation and "move-fast" culture with top-tier Polish engineering talent. You’ll be joining an environment that skips the bureaucracy in favor of high ownership, architectural excellence, and a product-first mindset. The Role As a Senior FullStack Engineer, you aren’t just executing tickets; you are a product builder. You will bridge the gap between robust, high-scale backend services and modern, highly interactive user interfaces. This role is perfect for someone who thrives in a fast-paced US tech culture, enjoys solving complex distributed systems puzzles, and cares deeply about delivering a world-class User Experience (UX). Your Responsibilities Full-Scale Development: Own features end-to-end, from database schema and API design to the final React component. Architecture & Scale: Contribute to the evolution of a Cloud-Native microservices architecture on Azure, designed to handle global traffic. Engineering Excellence: Maintain high standards (SOLID, Clean Code, Design Patterns) while maintaining the velocity needed for a competitive US market. Frontend Leadership: Drive the development of responsive, high-performance web applications using React. Global Collaboration: Partner closely with US-based Product Managers and Stakeholders to translate vision into scalable technical reality. Mentorship: Lead by example through Code Reviews and knowledge sharing, helping elevate the Warsaw engineering hub. Requirements Backend Expertise: 5+ years of experience in .NET (.NET 6/8+) and C#. Expertise in building RESTful APIs and event-driven architectures. Frontend Mastery: Solid experience with React and TypeScript. Familiarity with state management (Redux, Zustand, or React Query). Cloud-Native Mindset: Practical experience with Azure (App Services, Functions, Service Bus, Cosmos DB/SQL). Database Knowledge: Strong skills in SQL Server and Entity Framework Core. Modern DevOps: Hands-on experience with Docker, Kubernetes, and CI/CD pipelines (Azure DevOps/GitHub Actions). Language: Excellent English (C1) – essential for daily collaboration with the US team. Nice to Have Experience in high-growth FinTech, WealthTech, or high-frequency trading environments. Knowledge of testing frameworks (xUnit, Jest/Cypress). Familiarity with Web Performance optimization and Accessibility (WCAG). What We Offer US Tech Culture: A transparent, high-growth environment that values "radical candor," innovation, and taking initiative. Professional Growth: Access to the latest tech—we operate on the "bleeding edge" of .NET and React. Modern Warsaw Office: A vibrant, well-located hub for collaboration, combined with a flexible hybrid/remote policy. Competitive Compensation: 18.000 - 25000 PLN B2B Global Scale: Your code will power mission-critical systems used by financial professionals and institutions across the US and globally.

Lead SAP FI configuration, manage vendors, gather requirements, and present to senior management. | 8+ years SAP FI/CO experience, proven project leadership, vendor management, and stakeholder communication skills. | SAP FI Senior Consultant & Implementation Project Lead Location: Fully Remote Contract: B2B via Optiveum Poland Rate: Up to 6,000 EUR/month Start: ASAP Language: Fluent English The Role This isn't your typical SAP FI role. We need someone who can seamlessly shift between hands-on SAP FI configuration and project leadership—one moment troubleshooting technical issues, the next coordinating vendors or presenting to finance leadership. You'll spend: 50% on technical SAP FI configuration | 25% managing vendors & project coordination | 25% on requirements gathering & stakeholder management About Our Client Our Client is a global organization with complex commercial and manufacturing operations across multiple regions. The company places strong emphasis on cybersecurity, operational resilience, and data protection, operating in a mature, well-structured enterprise IT environment. Must-Haves Technical Expertise: 8+ years hands-on SAP FI/CO configuration (GL, AP, AR, Asset Accounting) Minimum 3 full lifecycle SAP implementations in a lead technical role Ability to independently troubleshoot complex issues and deliver quality solutions Project & Business Skills: Proven experience managing vendor relationships and holding partners accountable Track record gathering requirements from finance stakeholders (from accountants to CFOs) Ability to translate business processes into technical SAP configurations Strong presentation skills—comfortable explaining technical concepts to C-level Maturity: You don't need hand-holding—you independently own both technical and business aspects Comfortable navigating ambiguity and making decisions Natural leadership presence with both technical teams and business stakeholders Key Responsibilities Configure SAP FI modules and design integrations with CO, MM, SD Lead coordination with external implementation vendors and partners Facilitate requirements workshops and document business processes Review vendor deliverables and manage project timelines Present solutions to senior management and build stakeholder relationships Mentor junior team members and ensure quality standards Nice-to-Haves S/4HANA Finance migration experience PMP or PRINCE2 certification Multiple industry verticals experience German language skills What We Offer (via Optiveum Poland) B2B contract with Optiveum Poland Monthly compensation up to 6,000 EUR Long-term cooperation with a stable international organization Exposure to global finance, data, and ERP initiatives Fully remote work with international stakeholders