Senior Software Engineer

CompanySyntasso

LocationLondon Area, United Kingdom

Posted At1/25/2026

UK Visa Sponsorship Analytics

Occupation Type

Programmers and software development professionals

Occupation Code Skill LevelHigher Skilled

Sponsorship Salary Threshold

£54,700 (£28.05 per hour)

Occupation rate applies

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Description

Unlock the Future of Platform Engineering with Us

Imagine helping thousands of engineers build and run platforms that deliver securely and quickly, helping their teams ship real value. At Syntasso, you’ll be part of a small, expert team driving a global shift in how platform engineering is done. Your ideas will directly influence Kratix, our open-source framework, and our commercial product, Syntasso Kratix Enterprise.

By joining us, you won’t just build technology, you'll help define the standards of a new discipline. You’ll grow your technical depth, collaborate with leaders in the community, and see your contributions adopted by teams across industries.

Our Mission at Syntasso

At Syntasso, we believe platform engineering should empower, not constrain. We started the company after seeing too many teams struggle to build internal platforms that developers actually enjoy using.

That’s why we created Kratix: an open-source framework that helps organisations design, deliver, and scale their platforms with confidence. One early adopter cut platform onboarding from weeks to hours using Kratix, freeing engineers to focus on innovation instead of infrastructure.

Building on that success, we launched Syntasso Kratix Enterprise to help large-scale teams extend Kratix’s power with enterprise-grade capabilities. Together, these tools are rapidly becoming the go-to choice for platform teams worldwide.

By joining Syntasso, you’ll help shape the future of platform engineering empowering developers everywhere to work more effectively and build better software, faster.

Why Joining Syntasso Matters for Your Career:

By joining us, you'll become a pivotal part of our innovative journey, shaping the future of Kratix, our platform-building framework. Your role will involve close collaboration with Syntasso customers, giving you invaluable insights into their experiences and ensuring seamless Kratix adoption. You'll also have the opportunity to make a lasting impact on the Platform Engineering community in your unique way—whether it's through insightful blogs, prestigious conference speaking engagements, or active engagement with fellow professionals.

About the role:

As a Senior Software Engineer at Syntasso, you’ll play a key role in designing, building, and evolving Kratix and Syntasso Kratix Enterprise.

You’ll collaborate closely with a small, expert engineering team. Your work will span product contribution, customer collaboration, and hands-on system design. You’ll help shape architecture and APIs, improve user experience, and scale Kratix for enterprise environments.

In practice, this means you’ll:

Design and implement features for Kratix and Kratix Enterprise, primarily in Golang and Kubernetes.
Collaborate on architectural decisions that balance innovation, reliability, and usability.
Engage directly with customers to understand their platform challenges and ensure SKE solves them.
Work across product and engineering to deliver software that drives real impact.
Continuously learn, experiment, and help define what great platform engineering looks like.
Provide hands-on support to SKE customers, from diagnosing technical issues to shaping solutions that improve their platform outcomes.

About you:

Most importantly, you have a growth mindset. You bring enthusiasm, empathy, and a genuine desire to learn. Qualities that make you a trusted teammate and an active contributor to a thriving engineering community.

You’ve built and supported complex software systems before, maybe as part of a startup where you wore many hats, or within a larger organisation where reliability and scale were critical. You enjoy the puzzle of connecting technologies and people, translating complexity into clarity.

You thrive in collaborative environments: pairing, sharing ideas, and learning from those around you. When faced with ambiguity, your curiosity takes over; you test, learn, and adapt quickly. You’re motivated by solving real customer problems, not just writing elegant code.

You’re comfortable navigating distributed systems and modern infrastructure whether that’s working with Kubernetes, cloud platforms, or the CNCF and HashiCorp ecosystems. You have proficiency in Golang and Kubernetes, and one or more languages such as Ruby, Rust, or Python, with a willingness to learn whatever new tools help get the job done. You care deeply about engineering excellence practicing Extreme Programming (XP) techniques such as pairing, TDD, and continuous integration to deliver reliable, maintainable software.

What It’s Like to Work at Syntasso:

Working at Syntasso means joining a close-knit, highly collaborative team that loves to learn together. We value curiosity, openness, and craftsmanship — and we give each other the space to explore new ideas while always keeping our users in mind.

You’ll find us pairing on problems, running regular learning sessions, and sharing ideas that often spark new improvements for Kratix or contributions back to the open-source ecosystem we care about so deeply.

You’ll also be learning from experienced leaders who’ve built and scaled successful platform engineering businesses before. Our leadership team — including the founders of Kratix, and former senior leaders from organisations such as VMware and Pivotal, are deeply involved in day-to-day engineering and community work. They’re hands-on mentors who believe in empowering every team member to make an impact.

We’re also human. We look out for one another, we respect each other’s time, and we believe balance and wellbeing are part of doing great work. Our 35-hour week and hybrid model mean you can collaborate closely while still having space for deep focus and life outside of work.

What’s on Offer:

Competitive salary (£80,000–£120,000), depending on experience, plus early-stage equity, so you share in our success as we grow.
Financial stability: We’re a well-funded startup with a secure multi-year runway for growth and innovation.

A balanced 35-hour week, giving you time to focus deeply, recharge properly, and work sustainably.

Hybrid collaboration: Work remotely most of the time, with regular visits to our London Bridge office in the Leathermarket for hands-on teamwork and community.

Research Fridays: Every other Friday is dedicated to learning, experimentation, and open exploration — time to make Syntasso stronger tomorrow than it is today.

Professional growth: Whether you’re speaking at conferences, contributing to open source, or writing technical blogs, we’ll support you to develop your profile and share your expertise.

Learn from the best: Work closely with some of the most respected voices in platform engineering — our founders and team members who regularly speak at events such as DevOpsDays, Kubernetes Community Days, and FastFlow Conf.

We believe in an environment where you can thrive — one that combines technical challenge, personal growth, and genuine respect for your time and energy.