Senior Software Engineer – Backend (On-site)

JR United Kingdom; Slough; On-site; GBP 90,000 - 120,000; Full time

Job summary

A stealth-mode AI laboratory is seeking a Senior Software Engineer for backend development in Slough. The role focuses on designing scalable systems for Machine Learning workloads, requiring strong back-end development skills and experience with cloud-native technologies. Ideal candidates will have a collaborative mindset and be ready to mentor team members while tackling impactful engineering challenges.

Benefits

Competitive salary and equity

28 days leave + public holidays

Opportunities for professional growth

Qualifications

• 5+ years in back-end development with object-oriented programming languages.
• Experience in cloud platforms like AWS, GCP, Azure.
• Strong analytical and leadership skills.

Responsibilities

• Design and develop scalable, fault-tolerant backend systems.
• Lead complex projects and mentor team members.
• Collaborate on establishing best practices and standards.

Skills

Back-end development

Cloud-native technologies

Leadership

Problem-solving

Collaboration and communication

Tools

AWS

Terraform

C# (.NET 9)

Docker

Postgres

Job description

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Senior Software Engineer – Backend (On-site), Slough

Location: London (Liverpool Street)

Employment Type: Full-time and Permanent

Remuneration (London; On-site): £90–120k Base Salary + Discretionary Bonus + Equity

We are a stealth-mode AI laboratory researching and developing Machine Learning models.

The founding team consists of Cambridge graduates and former engineers at Microsoft, Bloomberg and Goldman Sachs. We are backed by prominent investors from the US and the UK, including institutional VC funds and C-level executives of global technology companies.

The role involves the design and development of backend infrastructure for Machine Learning workloads. You will work closely with the Machine Learning team; however, a background in Machine Learning is not required. This is an applied role, seeking a software engineer with experience in cloud computing and distributed systems.

In this role, you will:

• Design and develop highly scalable, fault-tolerant, and event-driven systems.
• Lead projects from inception to launch with a high degree of autonomy and ownership.
• Collaborate with the founding team to establish best practices, standards, and company culture.
• Mentor colleagues to raise the company's technical standards.
• Utilize AWS extensively, managing it with Terraform.
• Write services in C# (.NET 9) deployed to ECS or Lambda via GitHub Actions.
• Work with Postgres, SNS/SQS, and Redis.
• Maintain good end-to-end test coverage and confident deployment processes.

What we are looking for:

• Back-end development: 5+ years of experience in developing reliable, scalable backend systems with object-oriented programming languages.
• Cloud-native technologies: Experience with architecting and deploying in cloud platforms (AWS, GCP, Azure), containerization (Docker), infrastructure-as-code (Terraform), and observability tools (Datadog, Grafana).
• Leadership: Proven track record of leading complex projects.
• Problem-solving: Strong analytical skills and attention to detail, capable of breaking down complex projects.
• Collaboration and communication: Excellent interpersonal skills, able to communicate with both technical and non-technical stakeholders.

We acknowledge that no candidate checks every box—passion for solving complex challenges and willingness to learn are valued.

Nice to have:

• Machine Learning: Experience with generative models, LLMs, multi-modal models, and Deep Learning.
• Open-source: Contributions to open-source projects.
• Startup experience: Experience working in startup environments.
• Experience in cutting-edge AI research environments.
• An official role of “Founding Engineer” with impactful responsibilities.
• Competitive salary, equity, and benefits.
• 28 days + public holidays leave.
• Opportunities for professional growth.
• Work on impactful engineering challenges.
• Collaborate with high-profile clients and partners.