We're looking for a Senior Software Engineer who thrives on turning ambitious ideas into production systems that delight developers and deliver real business impact.
You’ll work across the stack, from backend APIs and orchestration to SDKs, dashboards, and developer tools. This role combines technical depth, product intuition, and leadership, making it ideal for engineers who want to shape both how things are built and why they matter.
You thrive on transforming complex AI systems into products that developers love to use. You think holistically about architecture, user experience, and business outcomes, and you take pride in delivering systems that are both elegant and dependable.
You are equally comfortable designing APIs, building scalable backend services, and improving developer-facing experiences. You set a high bar for quality, mentor others to reach it, and drive alignment between product ambition and technical reality.
Build and evolve backend APIs, SDKs, and developer tools that make AI integration seamless
Integrate and optimise image and video models while supporting new modalities such as audio and custom LLMs
Partner with platform and infrastructure teams to drive performance, reliability, and observability improvements
Shape technical direction through architectural discussions and long-term planning




Deep experience building distributed and high-performance systems
Strong programming skills in PHP or Go
Proven track record of designing and delivering scalable backend systems and APIs
Understanding of asynchronous workloads, queues, and streaming data
Experience working with cloud and bare-metal infrastructure
Excellent grasp of system design, performance optimisation, and scalability principles
Clear communicator who leads technical projects and collaborates effectively across teams
Proactive problem-solver who balances short-term progress with long-term vision
We're a remote-first collective, meeting in person twice a year to plan, brainstorm, celebrate wins, and enjoy some face-to-face time. We move quickly and hold a high bar, but we also believe sustainable performance matters. After major releases and milestones, we create space for the team to properly unplug, recharge and come back with the energy to tackle what's next.
Generous paid time off - vacation, sick days, public holidays
Remote-first setup - work from home anywhere we can employ you
Adaptable hours - own your schedule outside core collaboration blocks
Company retreats - twice-yearly gatherings in inspiring locations
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📌 Full Stack Software Engineer, Senior (España)
🏢 Runware
📍 España