Senior Software Engineer

Esendex

Nottingham

Hybrid

GBP 65,000 - 75,000

Full time

14 days+

Get more replies from employers

Send a job-specific resume in minutes.

Benefits offered by this job

Company Bonus Scheme

Healthcare plan

27 days annual leave + bank holidays

Wellbeing leave days

Birthday off

Pension 5%

Death in service (4x salary)

Annual awards

Social events

Training & development

Flexible hybrid working

Job summary

Commify is seeking an exceptional Senior Backend Engineer to own complex backend services, databases, and technical outcomes. You will drive architecture decisions, elevate engineering standards, and mentor the next generation of engineers while collaborating closely with Product Managers to refine requirements.

In an agile environment, you will balance feature delivery with resilience, performance, security, and cost-efficiency.

Qualifications

Strong backend design in C#/.NET and backend services.
Experience with distributed systems and event-driven patterns.
SQL data modeling and query optimization on Azure.
Experience with unit and integration testing.
Experience using AI tools in the development process.
DevOps mindset with Agile, Git and CI/CD practices.
Ability to mentor and lead engineering peers.

Responsibilities

Design, build, test, and refactor backend services and databases in C#/.NET.
Support platform modernization and migration to containerised services.
Lead code reviews and raise engineering standards, security, and testing.
Collaborate with Product Owners to shape acceptance criteria for real user outcomes.
Build and improve CI/CD pipelines, observability, and QA collaboration.
Balance design trade-offs with security, reliability, and cost-efficiency.

Skills

C#/.NET

Distributed Systems

SQL & Data Modeling

Azure Cloud

Unit & Integration Testing

AI in Coding

CI/CD

Mentoring

Communication

Leadership

Security & Reliability

Tools

Terraform

Bicep

Git

Azure DevOps

CI/CD Tools

Job description

At Commify, we're not just a company, we're a globally connected team of innovators who love what we do. As a CPaaS leader with 25 years of groundbreaking experience, we're the force behind over 7 billion customer interactions each year, enabling businesses worldwide to connect via advanced channels like SMS, RCS, and complex mobile journeys.

Our culture is our core strength. Operating across the UK, EMEA, the USA, and Australia, we've fostered a truly diverse and connected environment, earning a consistent 4 out of 5 culture score in our employee engagement surveys. You'll join a vibrant team where your diverse experience makes a daily global impact.

We need talented people to grow a global company where everyone feels proud to belong, have a purpose and do their best to directly shape the digital future.

We are looking for an exceptional Senior Backend Engineer to take ownership of complex backend services, database systems, and key technical outcomes.

In this role, you won't just be writing code—you’ll be driving architectural decisions, elevating engineering standards across the team, and mentoring the next generation of engineers. You will work closely with Product Managers and Owners to refine requirements, balancing functional features with resilience, performance, security, and cost-efficiency.

If you thrive in an agile environment, value software craftsmanship, and enjoy moving platforms forward, we’d love to hear from you.

What You’ll Be Doing

Architecture & Development: Design, build, test, and refactor complex, loosely coupled backend services and database systems in C#/.NET.
Platform Modernisation: Support our ongoing architecture evolution, including migrating serverless workloads over to containerised services.
Engineering Culture & Mentorship: Lead code reviews, mentor fellow engineers, and raise the bar for software development methods, security practices, and testing approaches.
Product Collaboration: Work directly with Product Owners to shape acceptance criteria, focusing on real-world customer outcomes rather than code alone.
DevOps & Quality: Build and improve CI/CD pipelines, manage observability (logging, metrics, monitoring), and partner with QA to ensure solid test coverage across the Agile pyramid.
Pragmatic Design: Evaluate design trade-offs, manage technical debt responsibly, and build security into systems from day one.

What We’re Looking For

Essential:

Core Tech Stack: Strong, proven expertise in designing and building backend services with C#/.NET.
Distributed Systems: Experience building loosely coupled architectures using event-based or message queue patterns.
Data & Cloud: Strong SQL skills (database design and query optimization) and experience operating services on a major cloud platform (we run exclusively on Azure, but equivalent AWS or GCP experience transfers smoothly).
Testing & Quality: A firm discipline in unit and integration testing as an integral part of your workflow.
Pragmatic AI Usage: Practical, day-to-day experience using AI coding assistants as part of your development process— with the critical mindset to review, adapt, or reject generated code.
DevOps Mindset: Comfortable working in agile environments with Git and CI/CD pipelines.
Communication & Leadership: Ability to explain complex technical concepts clearly to non-technical stakeholders, along with a track record of mentoring team members.

Desirable (Bonus points if you have):

Experience with modern .NET versions (we are moving to .NET 10) and native Azure services.
Experience with Infrastructure as Code (we use Bicep; Terraform experience is equally welcome).
Familiarity with both serverless and containerised infrastructure.
Full-stack capabilities or frontend experience with component frameworks like Angular.
Experience with high-throughput transactional messaging (SMS, IP messaging).
Experience leveraging AI tools beyond code generation (e.g., test generation, refactoring, documentation).