Definely names Sigurjón Ísaksson CTO after a year of strong growth
Definely has promoted Sigurjón Ísaksson to chief technology officer, strengthening its senior leadership after a standout year that included a $30 million Series B and a push into North America. Ísaksson joined in 2024 as head of AI and led the development of agent-driven products that lifted the company's capabilities across contract review.
He brings nearly a decade of machine learning experience and previously served as CTO and co-founder at fintech company Nosso. In his new role, he will continue to lead product development while growing the technical and AI engineering teams to support customer demand.
What product leaders should note
- Single owner across AI and platform: Faster shipping and clearer decision-making loops when model work, product, and infrastructure sit under one roof.
- Agent architecture in production: Practical signal that complex workflows (like contract review) can be automated end-to-end with clear guardrails.
- Enterprise fundamentals prioritized: Reliability, security, and readiness for scale are explicit focus areas as adoption grows.
- Build where users already work: Definely integrates inside Microsoft Word, reducing friction and accelerating usage. For context, see Microsoft's guidance on Word add-ins.
- Proven product velocity: Launches like Enhance and Cascade show a cadence of shipping that product orgs can model-ship, observe, iterate.
Quotes that point to the roadmap
"2025 has shown that Definely's AI offering is uniquely positioned within a crowded market, and the customer success speaks for itself," said Ísaksson.
"I have spent the last two years developing first-of-its-kind AI solutions for complex contract reviewing, unifying Definely's existing product stack to solve end-to-end workflows for lawyers, and I look forward to doubling down on this as chief technology officer."
Nnamdi Emelifeonwu, co-founder and CEO, added: "As head of AI, he led the development and launch of Enhance and Cascade, products now trusted by law firms and in-house legal teams around the world. Appointing him as chief technology officer gives us continuity and real momentum: faster shipping, stronger technical ownership across both AI and platform, and a clear focus on scaling reliability, security, and enterprise readiness as demand accelerates."
Why this move matters for product development
Consolidating AI and platform leadership reduces handoffs and shortens the path from research to production. It also clarifies ownership for cross-functional work-data, privacy, infra, and user-facing quality all move in sync.
Definely's approach-embedding inside Word, unifying the stack, and shipping agents for concrete legal tasks-offers a practical blueprint for teams building AI into established workflows. The lesson: integrate, tighten feedback loops, and measure value in real usage, not just models.
What to watch next
- Shipping cadence on AI features (latency, accuracy, explainability, and safety signals).
- Depth of enterprise capabilities (security posture, reliability SLAs, admin controls).
- Hiring pace across AI engineering, platform, and product-an indicator of near-term priorities.
- Partnerships within the Microsoft ecosystem that further reduce adoption friction.
About Definely
Definely builds AI-based tools that help lawyers review complex contracts directly inside Microsoft Word. With new leadership in place, the company is set to scale product delivery while keeping enterprise-grade reliability and security in view.
If you're building similar capabilities and want to sharpen team skills, explore AI courses for product roles.
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