Senior Backend Engineer | Fast-Growth SaaS Scale-Up | Remote (UK-Based) with Monthly Meet-ups
Haystack is working with an established and profitable SaaS scale-up that’s currently hiring two Senior Backend Engineers to join their growing team. You’ll be working directly with the CTO and play a crucial role in shaping the next phase of the company’s technical and product evolution.
This is a fantastic opportunity to join a high-performing, pragmatic, and low-ego engineering culture, where your ideas will be heard, and your work will have real impact from day one.
About the Company
* Product-led SaaS scale-up with an exceptional reputation for technical excellence and customer experience
* Profitable, secure, and growing fast with a loyal and expanding customer base
* Competing in a traditionally outdated market with a disruptive, high-performing platform
* Modern tech stack, strong internal processes, and a focus on engineering quality
The Role
As a Senior Backend Engineer, you’ll:
* Work across all areas of the platform (backend services, core technology, and optionally web apps)
* Own and deliver high-impact features that improve performance, scalability, and customer experience
* Collaborate closely with customer success teams to remain responsive to customer needs
* Play a key part in growing and mentoring the engineering team over the next 12–24 months
* Contribute to technical decisions and architecture in a high-trust environment
Tech Stack
* Backend: Go, PostgreSQL, Redis, Timescale, Temporal.io
* Deployment: Kubernetes on GCP & AWS
* Other languages: C#, C++ (core tech), Svelte & TypeScript (web apps)
* Development Environment: Linux-based, focused on fast dev/test loops
What We’re Looking For
* 10+ years' experience in software engineering, ideally in start-up/scale-up environments
* 2+ years of commercial Go experience
* Deep experience with at least one of: Go, C#, Java, C, or C++
* Proven background in building and operating cloud services or complex distributed systems
* Comfortable in a Linux dev environment and working with infrastructure tooling
* Strong ownership mindset, with the ability to take a feature/project from idea to deployment
* Experience mentoring engineers and contributing to a supportive, collaborative team culture
* Willingness to participate in an on-call rota (after onboarding)
* UK-based and happy to travel monthly for team meetups (usually in Cambridge or other locations in the South/East of England)
Nice-to-Haves
* Experience or interest in DevOps/infrastructure: observability, IaC, cloud environments, deployments, etc.
Why This Role?
* High-impact position in a company that values technical excellence and close customer collaboration
* Work with experienced engineers in a flexible, remote-friendly setup (with monthly in-person time)
* Opportunity to grow with the business and take on increasing leadership responsibilities
* Flat structure, fast decision-making, and genuine autonomy
Interested?
If you’re an experienced backend engineer looking for a hands-on, high-ownership role in a fast-growing, technically-minded scale-up, let’s chat. Apply now and hear back within 48 hours.