techholding

Windows Extension Developer (Contractor)

Senior Technical Recruiter (OnSite)

macOS Extension Developer (Contractor)

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UiPath Developer (Onsite) - Contract

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Technical Project Manager (Contract)

Tech Holding is seeking a senior Windows systems engineer to develop and maintain a production-grade Windows sync client using Microsoft's Cloud Files API. This deeply technical role involves owning low-level plumbing for seamless on-demand file synchronization, including placeholder hydration, shell overlay icons, Explorer context menus, and high-throughput I/O. The engineer will collaborate with product and backend teams to deliver a high-quality, reliable sync client.

UX/UI Designer (Contractor)

About us:Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability.<h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">The Role</h4>We are looking for a senior Windows systems engineer to build and maintain a production-grade Windows sync client using Microsoft's Cloud Files API (CF API). You will own the low-level plumbing that makes seamless, on-demand file synchronization feel invisible to end users, from placeholder hydration and shell overlay icons to Explorer context menus and high-throughput I/O. This is a deeply technical IC role. You will work closest to the metal of the Windows platform, collaborating with product and backend teams to ship a sync client that rivals OneDrive and Dropbox in quality and reliability.Key Responsabilities:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Design and implement a Windows Cloud Files API (CF API) sync provider, including placeholder management, hydration/dehydration callbacks, and range-based partial hydration.</li><li class="leading-relaxed">Build robust Windows Shell integration: overlay icons, right-click context menus, and deep Windows Explorer integration via COM.</li><li class="leading-relaxed">Own Win32 and NTFS-level file system interactions, including extended attributes, reparse points, and oplocks.</li><li class="leading-relaxed">Implement high-performance I/O using IOCP and Windows thread pool APIs to handle concurrent file transfers reliably.</li><li class="leading-relaxed">Write and maintain COM servers and in-process shell extensions that meet Microsoft's strict reliability and compatibility requirements.</li><li class="leading-relaxed">Debug complex race conditions, kernel-mode interactions, and edge cases introduced by antivirus software, Group Policy, and diverse hardware configurations.</li><li class="leading-relaxed">Maintain backward compatibility across Windows 10 and Windows 11, including various enterprise and consumer SKUs.</li><li class="leading-relaxed">Instrument code with ETW tracing, WPR/WPA profiling, and crash dump analysis to diagnose production issues.</li><li class="leading-relaxed">Collaborate with QA to develop stress tests, fuzz tests, and automated regression suites for the sync engine.</li><li class="leading-relaxed">Contribute to architecture and design reviews, set engineering standards for the Windows client codebase</li></ul>Required Skills:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">5+ years of Windows systems programming in C++, with deep mastery of Win32 APIs, NTFS internals, and COM.</li><li class="leading-relaxed">Strong, hands-on experience with the Windows Cloud Files API (cfapi.h): placeholder files, CFCALLBACKTYPE hydration callbacks, pin/unpin semantics, and range-based partial hydration.</li><li class="leading-relaxed">Demonstrated expertise in Windows Shell integration: overlay icon handlers, context menu shell extensions, and Explorer namespace extensions via COM.</li><li class="leading-relaxed">Solid multithreading experience using IOCP, Windows thread pools, and synchronization primitives (events, mutexes, critical sections, slim reader/writer locks).</li><li class="leading-relaxed">Has shipped at least one production Windows sync client (cloud storage client, backup agent, or equivalent), this is non-negotiable.</li></ul>Nice-to-have Skills:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Experience with Windows kernel-mode development (filter drivers, minifilters) or deep knowledge of the Windows I/O stack.</li><li class="leading-relaxed">Familiarity with Windows Security: ACLs, privilege management, integrity levels, and UAC.</li><li class="leading-relaxed">Prior work on enterprise software distributed via MSI/MSIX with silent install and Group Policy support.</li><li class="leading-relaxed">Experience contributing to or maintaining large-scale C++ codebases with CI/CD pipelines (GitHub Actions, Azure DevOps).</li><li class="leading-relaxed">Familiarity with WinRT APIs and bridging classic Win32 components to modern Windows Runtime environments.</li><li class="leading-relaxed">Background in network programming (HTTP/2, WebSockets, chunked transfer) in the context of cloud sync.</li></ul>What we offer:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Fully remote engagement across MX.</li><li class="leading-relaxed">Opportunity to work on high-impact client systems with real operational ownership.</li></ul><h4 class="text-lg md:text-xl font-semibold mt-6 mb-2 text-gray-800">Employment type:</h4><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Contract</li></ul>Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected characteristic. If you require accommodation in the application process, please contact our HR

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BlackRock

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Venture & Growth Debt - Analyst - London

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At BlackRock, the Data Management team builds and operates core systems for high-quality Private Markets data. As an Associate, Software Engineer, you will join an engineering pod responsible for building and evolving platforms for researchers to manage Private Markets data. Your work will focus on delivering robust, scalable systems supporting complex data models, validation rules, and integrations. You will contribute across the full development lifecycle, collaborating with product managers and data owners to design solutions that balance technical excellence with usability.

BlackRock is a global asset manager and technology provider. Our purpose is to help more and more people experience financial well-being. We help millions of people invest to build savings that serve them throughout their lives. We make investing easier and more affordable. We advance sustainable investing because our conviction is it delivers better outcomes for investors. We contribute to a more resilient economy that benefits more people.Together with our clients, we’re contributing to a more equitable and resilient world – today and for generations to come. That’s why, we’re asking bigger questions – of ourselves, our industry, and the world at large. Questions that challenge convention and give rise to new thinking. Because the bigger questions we ask, the bigger actions we can take. &nbsp; &nbsp; Follow us for global insights shaping the economy, innovative thinking around the path to net zero and more information on culture and careers at BlackRock.https://bit.ly/3n6Fxdy

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<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">About this role</h3>At BlackRock, technology is central to our mission, and our team continues to drive innovation across the industry. We value curiosity, collaboration, and a willingness to experiment to tackle complex problems. Here, you’ll experience a collaborative environment where teamwork happens across departments, regions, and specialties. BlackRock is dedicated to your professional growth as a technologist, offering tailored learning resources, tech‑focused career paths, and access to global experts and leaders.<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">Team background</h3>The Data Management team builds and operates the core systems that enable our researchers to efficiently capture, manage, and maintain high‑quality Private Markets data. Our work underpins critical research and product workflows across the firm, replacing legacy platforms with modern, scalable services and improving data quality, auditability, and accessibility.We are responsible for Cura, a suite of researcher‑facing applications and backend services that act as the system of record for key Private Markets entities and datasets. The team works closely with Product, Research, and Data partners to evolve Cura in line with business needs, while maintaining high engineering standards and a strong focus on reliability, performance, and maintainability.<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">The role</h3>As an Associate, Software Engineer on the Data Management team, you’ll join an engineering pod responsible for building and evolving the platforms that researchers use to manage Private Markets data. Your work will focus on delivering robust, scalable systems that support complex data models, validation rules, and downstream integrations.You’ll contribute across the full development lifecycle, from design and implementation through to testing, release, and ongoing support. Collaboration is central to the role: you’ll work closely with other engineers, product managers, and data owners to design solutions that balance technical excellence with real‑world usability, and you’ll play an active role in shaping the team’s technical direction.<h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">Key responsibilities will include:</h3><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Designing, implementing, and maintaining robust backend and frontend systems that support researcher workflows and data management use cases.</li><li class="leading-relaxed">Building and evolving APIs and services that distribute data to internal consumers and external integrations, with a strong focus on correctness, auditability, and performance.</li><li class="leading-relaxed">Collaborating with engineers across the organisation to drive adoption of shared patterns and raise engineering standards through code reviews, documentation, and knowledge sharing.</li><li class="leading-relaxed">Actively contributing to technical discussions around data modelling, system architecture, and platform evolution to ensure solutions remain scalable and adaptable over time.</li><li class="leading-relaxed">Supporting the gradual decommissioning of legacy systems by delivering well‑tested, production‑ready replacements.</li></ul><h3 class="text-xl md:text-2xl font-bold mt-8 mb-3 text-gray-800">What we are looking for:</h3><ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">4+ years’ experience in software engineering, working on production systems.</li><li class="leading-relaxed">Strong technical ability across the full stack, including modern web applications, backend services, and APIs. Python and .NET experience is beneficial.</li><li class="leading-relaxed">Experience working with relational and non‑relational databases, including designing schemas and writing performant queries.</li><li class="leading-relaxed">Experience building and running systems in the cloud (AWS or Azure), including use of infrastructure as code (Terraform).</li><li class="leading-relaxed">Familiarity with containerization and orchestration technologies such as Docker and Kubernetes.</li><li class="leading-relaxed">A solid understanding of software engineering fundamentals, including testing, version control, and CI/CD practices.</li><li class="leading-relaxed">Excellent verbal and written communication skills, with the ability to explain technical concepts to a range of stakeholders.</li><li class="leading-relaxed">A proactive, “challenge accepted” mindset, with curiosity and willingness to learn new technologies and ways of working.</li></ul>Our benefitsTo help you stay energized, engaged and inspired, we offer a wide range of benefits including a strong retirement plan, tuition reimbursement, comprehensive healthcare, support for working parents and Flexible Time Off (FTO) so you can relax, recharge and be there for the people you care about.Our hybrid work modelBlackRock’s hybrid work model is designed to enable a culture of collaboration and apprenticeship that enriches the experience of our employees, while supporting flexibility for all. Employees are currently required to work at least 4 days in the office per week, with the flexibility to work from home 1 day a week. Some business groups may require more time in the office due to their roles and responsibilities. We remain focused on increasing the impactful moments that arise when we work together in person – aligned with our commitment to performance and innovation. As a new joiner, you can count on this hybrid model to accelerate your learning and onboarding experience here at BlackRock.

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