Top Tech Startups in Madrid, Spain in 2027

Altinity is the leading service and software provider for ClickHouse - an open source SQL data warehouse offering industry-leading query speeds on petabyte-scale data. Altinity offers the highest expertise on the market to help customers deploy and run the most demanding analytic applications. We also provide innovative software to manage ClickHouse in Kubernetes, cloud, and bare metal environments.

MOLTEN is a cloud platform that streamlines core operations of media and entertainment enterprises. MOLTEN digitizes and transforms rights, content, and licensing operations across enterprises, empowering teams with real-time insight and automation tools to do more, accelerating deal-making and content monetization worldwide. MOLTEN offers multiple integrated cloud-based services to power back-end operations for media and entertainment enterprises, which include content rights, storage, delivery and licensing management.

What are we all about? We are a team of world-class builders and researchers with expertise across several domains: Ethereum Protocol Engineering, Layer-2, Decentralized Finance (DeFi), Miner Extractable Value (MEV), Smart Contract Development, Security Auditing, and Formal Verification. Working to solve some of the most challenging problems in the blockchain space, we frequently collaborate with renowned companies, such as Ethereum Foundation, StarkWare, Flashbots, xDai, Open Zeppelin, Forta Protocol, Energy Web, POA Network, and many more. We actively contribute to Ethereum core development, EIP's and network upgrades together with the Ethereum Foundation, and other client teams. Today, there are 100+ of us distributed across the world. You can view all our open positions here: jobs.nethermind.io

CLOZR is the premier infrastructure firm for high-growth enterprises. We do not simply service companies; we engineer the structural integrity required to dominate markets. CLOZR serves as the strategic backbone for ambitious ventures, facilitating the critical transition from early-stage volatility to institutional-grade stability. Our Mandate To provide the operational architecture, financial fidelity, and commercial logic necessary for capital efficiency and sustainable scale. We address the enterprise holistically, ensuring that every facet of the organization—from balance sheet management to client acquisition protocols—operates with deterministic precision. The CLOZR Ecosystem Our firm operates across four integrated verticals, delivering a comprehensive growth ecosystem: Strategic Infrastructure Advisory: We act as high-level partners, re-engineering operational workflows to ensure organizational resilience and autonomy. Financial Intelligence & Reconciliation: We deploy proprietary logic to bridge the divide between commercial activity and capital reality, ensuring audit-grade financial clarity. Commercial Systems Engineering: We construct sophisticated sales architectures that transform revenue generation from a variable art into a predictable science. Corporate Governance & Strategy: We provide the executive guidance required to navigate complex market dynamics and execute high-stakes expansion strategies. The Model CLOZR represents the convergence of Strategic Counsel and Proprietary Technology. We are not merely a service provider; we are a capital partner in your operational success. By integrating high-touch advisory with automated technological frameworks, we deliver what the modern market demands: Truth, Speed, and Control. Join the Firm We are assembling a cadre of architects, engineers, and strategists dedicated to defining the future of business infrastructure.