Role Overview 

The Software Engineer will play a vital role in the design, development, troubleshooting, and debugging of software programs for both our existing product line and new innovations. This position involves developing software and tools that support design, infrastructure, and technology platforms, including operating systems, compilers, routers, networks, utilities, databases, and cloud-based or Internet-related tools. Additionally, the engineer will assess hardware compatibility and its influence on hardware design.

We are particularly keen on candidates who possess experience in embedded software development for this role.

Key responsibilities for this role include:  

• Design, develop, and maintain scalable systems software and platform tools to support new product development
• Build and enhance high-performance applications using object-oriented programming languages such as Python and Rust.
• Develop data processing pipelines, analytical models, and optimisation algorithms using scientific computing libraries including NumPy, SciPy, TensorFlow, and PyTorch.
• Create intuitive data visualisation and monitoring tools using Matplotlib, PyQtGraph, and related frameworks to support engineering and operational decision-making.
• Design and implement responsive desktop user interfaces using Qt, PySide6, and QML, ensuring strong usability and user experience standards.
• Troubleshoot, debug, and resolve complex software and system issues across development, testing, and production environments.
• Collaborate with cross-functional engineering teams to influence system architecture, software design, and hardware compatibility decisions.
• Develop and maintain deployment pipelines and release automation processes using Azure DevOps Pipelines, PyInstaller, and CI/CD best practices.
• Implement robust software quality assurance practices, including automated testing, static analysis, and code quality validation using pytest, mypy, and pylint.
• Participate in agile software development processes, including sprint planning, backlog refinement, and technical documentation using Jira and Confluence.
• Manage source code, branching strategies, and peer code reviews using Git, Bitbucket, and related version control tools.
• Contribute to the continuous improvement of software engineering standards, development workflows, and testing methodologies.
• Support the full software development lifecycle from requirements gathering and prototyping through deployment, maintenance, and enhancement.
• Work closely with stakeholders to translate technical and operational requirements into reliable and maintainable software solutions.

We are ideally looking for someone with the following skills and experience:

• Strong object-oriented programming experience with Python and related modern development practices.
• Experience developing data analysis workflows, optimisation routines, and algorithms using scientific computing and machine learning frameworks including NumPy, SciPy, Jupyter, TensorFlow, and PyTorch.
• Proficient in creating data visualisation and analytical reporting tools using libraries such as Matplotlib and PyQtGraph.
• Experience designing and developing desktop user interfaces and user experiences using Qt and PySide2/PyQt5 frameworks.
• Knowledge of software packaging, deployment automation, and CI/CD processes using tools including PyInstaller and Azure DevOps Pipelines.
• Proficient in version control, branching strategies, and collaborative development workflows using Git, Sourcetree, and Bitbucket.
• Familiarity with Agile software development methodologies, issue tracking, sprint planning, and technical documentation using Jira and Confluence.
• Strong understanding of software quality assurance, automated testing, static analysis, and validation frameworks including pytest, mypy, pylint, Xray, and TestRail.

We know there is no such thing as the perfect candidate and that there is great value in transferrable skills, so please don’t feel you have to tick all of the above boxes to apply!

Why work for Refeyn?

Compensation and core benefits

• We anticipate a base salary of £45,000 to £60,000 for this role, depending on candidate experience 
• 25 days annual leave per year in addition to bank holidays
• Up to 7% employer matched pension contribution
• Private health insurance from day one plus critical illness cover, income protection and life insurance
• Give as You Earn and Cycle to Work salary sacrifice schemes.
• Annual Company and Individual bonus scheme 
• Paid volunteer day

Family Friendly Benefits

Refeyn offers YellowNest Nursery Scheme to all employees once probation is passed, and new parents can benefit from up to 17 weeks fully paid maternity, adoption and shared parental leave, 4 weeks fully paid paternity leave, plus an annual allowance for emergency childcare.

Supporting your Development

All employees receive access to Linkedin Learning which offers thousands of courses to support their personal and professional development. We also run frequent training sessions on both hard and soft skills.

Creating an Engaging Culture

Refeyn supports hybrid working where the role allows and offers flexible start and finish times. We also have a subsidised weekly lunch for onsite employees and a vibrant social calendar which includes holiday parties and midsummer festivals plus an annual team budget for managers to plan team-building activities.

Values-Led 

Refeyn is committed to celebrating each other’s differences and creating a dynamic, driven and diverse culture where everyone can flourish. We are proud to have been awarded Committed Status by the Inclusive Employers Standard in 2024 and are working hard to create a safe and empowering environment for all.

We firmly believe that there is great strength in building teams with different voices, experiences, perspectives, and backgrounds so that we can continue to share the team workload and enable our customers to succeed, and we welcome applicants from all sections of society to join us on our mission to advance discovery through innovation. 

Refeyn is proud to use anonymised hiring practices. Identifying information such as a candidate's name, email address, date of birth and photo will not be visible to the hiring manager when they review CVs.

About Dubber

Dubber is the world’s leader in conversation capture and intelligence, revolutionising how businesses capture, analyse, and leverage their conversations. With cutting-edge AI technology, Dubber provides a comprehensive suite of tools and features that goes beyond traditional call recording and transcription solutions.Built to scale to meet any need, Dubber allows organisations to unlock the insights to be found in calls, videos and messages.

Already adopted as core network infrastructure by hundreds of global communications services and applications worldwide, Dubber is specifically designed to help service providers to differentiate, drive new revenues and improve customer retention.

The Team

The capture team at Dubber is a group of talented software engineers who specialise in building, running and operating secure, resilient and scalable platforms to capture audio and video streams from a variety of sources. Capture is at the heart of what Dubber does, and the team is currently embarking on an exciting journey to modernise, simplify and consolidate Dubber’s existing capture capabilities.

The Role

We’re looking for a Senior Engineer with deep telephony experience located in Oxford or London. You’ll be part of a distributed team, modernising and maintaining capture platforms and tools in a multi-cloud environment across many geographies. If you like solving complex problems in simple ways and have a passion for all things audio, then this might be the role for you.

This is a hands-on engineering role with significant ownership: you’ll design, ship and maintain telecommunication services, support production systems, and collaborate across engineering, product, and customer-facing teams to deliver robust solutions.

About You

• You’re enthusiastic, and like solving problems and being hands
• You enjoy communicating and collaborating with
• You’re curious, eager to learn, and have a desire to continuously improve your
• You have previous experience in agile software
• You got deep expertise and experience in software engineering of telephony/voice solutions
• You’ve (ideally) worked in public cloud environments (AWS, Azure, GCP or other).
• You’ve got some knowledge of Docker and Kubernetes (or similar container platforms).
• You’re familiar with highly-automated environments deployed through Infrastructure as Code (using Terraform or similar).
• You know about coding and security best practices and relevant
• You’re comfortable supporting what you

Digging Deeper

• You’re experienced in programming in C/C++ (oriented to VoIP software).
• You have significant experience in SIP protocol including signalling and
• You have experience with SIP signalling analysis for SIP Proxy, SBC, Gateway, Trunk, Registration and bridged media sessions.
• You have experience with open-source software like Asterisk and Freeswitch (configuration, compilation and installation of modules).
• You have experience with OpenSIPs (Load balancing, branches and routes).
• You’re confident with Linux administration (command line) for updating, patching, compiling and creating deb packages.
• You have knowledge of telephony codecs and media containers such as PCMU, PCMA, WAV and
• You have experience Generating SIP scenarios for functional and load testing (SIPp and/or other tools).
• You’re strong in IP networking and have knowledge of routing, NAT, DNS, VPNs and firewalls.
• You have SBC knowledge with AudioCodes, Oracle/Acme Packet or

Why should you join Dubber?

• At Dubber, you’ll join a high-performing global team where curiosity, accountability, and collaboration drive everything we do.
• We offer a competitive salary and bonus structure, along with the opportunity to grow your skills and make a real impact in a rapidly evolving technology environment.
• With team members located around the world, you’ll be part of an inclusive, flexible, and supportive workplace that values diverse perspectives and empowers you to do your best work.
• We foster a collaborative, supportive culture as we work toward ambitious goals.