Senior Software Engineer

ieso; Cambridge; On-site; GBP 50,000 - 90,000; Full time

Job summary

Join a mission-driven company that is transforming mental healthcare through innovative technology. As a Senior Software Engineer, you will work within a collaborative Scrum team, tackling complex challenges and shaping the future of mental health services. Your expertise will help design and build cloud-native applications, enhance system performance, and mentor fellow engineers. This role offers the opportunity to make a real-world impact while working with a modern tech stack in a supportive environment that values ethics and innovation. If you're passionate about using technology for good, this is the perfect opportunity for you.

Qualifications

• Strong experience in building cloud-native web applications and APIs.
• Knowledge of microservices, event-driven design, and DDD.
• Experience with automated testing frameworks and CI/CD tools.

Responsibilities

• Design, build, and evolve complex services and systems.
• Lead large technical initiatives across team boundaries.
• Mentor engineers through pairing, code reviews, and feedback.

Skills

Cloud-native web applications

APIs

SQL

NoSQL

Agile methodologies

Kubernetes

Docker

CI/CD

Microservices

Event-driven design

Tools

.NET

C#

TypeScript

Python

Azure Functions

SQL Server

CosmosDB

GitHub

Azure DevOps

Terraform

Job description

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Senior Software Engineer

Help shape the future of mental healthcare.

At Ieso, we're redefining how mental health services are delivered, using clinically validated digital therapies and advanced technology to bring life-changing support to people when they need it most. We're growing our engineering team and looking for a Senior Software Engineer who’s passionate about building systems that genuinely make a difference.

About the Role

As a Senior Software Engineer, you'll work in a collaborative Scrum team to tackle complex technical challenges, develop new functionality, and evolve our systems for scale, security, and performance. You'll help drive architectural decisions, mentor others, and champion best practices while working in an environment that values ethics, innovation, and care quality.

You’ll report to our Principal Software Engineer and be a key part of a supportive, mission-driven team.

What You'll Do

Technical Impact

• Design, build, and evolve complex services and systems
• Own and drive technical solutions across the stack
• Apply strong debugging, analysis, and instrumentation skills
• Contribute to our company-wide architecture and service design
• Improve CI/CD, observability, and deployment pipelines

Project Ownership

• Lead large technical initiatives across team boundaries
• Plan for testing, monitoring, and reliability from day one
• Manage technical risks and break down large problems into workable parts
• Influence "build vs. buy" decisions and shape system design
• Mentor engineers through pairing, code reviews, and feedback
• Share knowledge and increase the visibility of your team’s work
• Facilitate architecture conversations and contribute to RFCs and epic briefs
• Support engineering culture grounded in learning, curiosity, and care

What We’re Looking For

• Strong experience building cloud-native web applications and APIs (We use .NET, C#, TypeScript, Python, Azure Functions)
• Solid experience with SQL and NoSQL databases (We use SQL Server & CosmosDB)
• Knowledge of microservices, event-driven design, DDD
• Experience with automated testing frameworks and CI/CD tools
• Strong communicator with a growth mindset
• Comfortable working in Agile teams (Scrum/Kanban)
• Willing to join our on-call rotation and support production systems
• Experience with Kubernetes, Docker, Helm, Terraform
• Understanding of web security principles (e.g., OWASP)
• Exposure to performance tuning and legacy system migration
• Familiarity with GitHub, Azure DevOps, App Insights, Azure ML/Bot Services
• Experience with functional programming principles
• Join a mission-led company focused on transforming mental healthcare
• Work with a modern tech stack and collaborative cross-functional teams
• Support a culture of curiosity, innovation, and high trust
• Be part of a team where your work has real-world impact

If you want to work with an innovative team working on a real work problem them please apply.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

• Industries

  Software Development

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