Senior Kotlin Engineer

Homerun B.V.; Leeds; Hybrid; GBP 65,000 - 95,000; Full time

Benefits offered by this job

Competitive salary

Company pension

Growth opportunities

Job summary

Avenue3, a Yorkshire-based digital consultancy, is seeking a Senior Engineer to design and deliver robust cross‑platform software. You will work in agile, multidisciplinary teams on projects that span health, government and regulated sectors.

You’ll mentor others and contribute to engineering standards, patterns and practices used across Avenue3. You will design, implement and refine features for Kotlin Multiplatform apps, with a focus on maintainability, testing and production readiness in

Qualifications

• Extensive experience delivering cross‑platform apps in Kotlin.
• Strong collaboration with architects, PO and clients in agile settings.
• Proven ability to ship robust features end‑to‑end.
• Excellent problem solving and code quality discipline.

Responsibilities

• Design, build and maintain cross‑platform applications using Kotlin Multiplatform and Compose.
• Own features end‑to‑end from design to production across Android and desktop targets.
• Contribute to DevOps practices, CI/CD pipelines and Gradle tooling.
• Write clean, well‑tested code and mentor engineers in the team.
• Collaborate with architects, product owners and client stakeholders.

Skills

Kotlin

Kotlin Multiplatform

Compose Multiplatform

Android

CI/CD

DevOps

Gradle

Software Architecture

Tools

CI/CD tooling

Job description

Full-time · Hybrid · Leeds-based · Occasional travel to client sites

Who are we?

Avenue3 is a Yorkshire-based digital consultancy specialising in open data, modern engineering and the transformation of complex systems across health, government and regulated sectors. We bring deep expertise across strategy, discovery, architecture and engineering, helping organisations modernise systems and adopt open data standards for long-term interoperability.

Our teams focus on high-quality delivery, using agile, collaborative ways of working that de-risk programmes and accelerate outcomes. Avenue3 offers a purpose-driven culture centred on impact, openness and meaningful problem-solving - giving engineers autonomy and influence over how we design and deliver solutions.

The opportunity

At Avenue3, we're looking for a Senior Engineer who combines strong hands-on technical skills with a thoughtful, customer-focused mindset. This role is about delivering high-quality software in complex, often disconnected or high-latency environments, writing great code, contributing to sound technical decisions and helping our clients move forward with confidence.

You'll thrive in agile, multidisciplinary teams where requirements aren't always fully defined, using your experience to ask the right questions, shape pragmatic solutions and translate ideas into robust, maintainable software. You'll work closely with architects, product owners and client stakeholders, taking ownership of features and components from design through to production.

Alongside delivery, you'll help raise the bar across the team, through code review, mentoring less experienced engineers, and contributing to the standards and patterns we use across Avenue3.

Core responsibilities

Design, build and maintain robust cross-platform applications using Kotlin Multiplatform and Compose Multiplatform, owning features end-to-end from design through to production across Android and desktop (Windows/macOS/Linux) targets.

Work across shared business logic and platform-specific implementations using Kotlin's expect/actual pattern, touching networking, local storage and device-integration layers.

Build and ship applications that sync reliably in disconnected and high-latency environments, applying strong DevOps practices, CI/CD pipelines and Gradle-based build tooling.

Deliver clean, well-tested, maintainable code, with appropriate automated testing across the SDLC.

Investigate and resolve issues across the stack, including in production, with a calm, methodical approach.

Technical Decision-Making

Contribute to technical design discussions and implementation plans, bringing pragmatic, well-reasoned options to the table.

Make sound day-to-day decisions on libraries, patterns and approaches within the boundaries set by the wider architecture.

Help uphold engineering standards, ensuring services are scalable, secure, observable and interoperable.

Identify technical risks and debt early, and work with the team to address them in a structured way.

Work closely with product owners, designers, architects and client teams to refine requirements and shape solutions that meet user and business needs.

Communicate technical concepts clearly to both technical and non-technical audiences.

Participate confidently in design sessions, refinements, show & tells and other delivery ceremonies.

Represent Avenue3 well with clients. Professional, constructive and focused on outcomes.

Commercial Awareness & Value Creation

Build an understanding of client organisations, their goals and the context in which they operate.

Spot opportunities to add value beyond immediate tickets. Improvements to architecture, delivery flow, tooling or operational efficiency, and raise them with delivery and technical leads.

Balance technical decisions with practical considerations of cost, complexity and effort, so solutions are robust without being over-engineered.

Support proposals, estimates and discovery activities where engineering input is needed.

Mentor and support less experienced engineers through pairing, code review and day-to-day collaboration.

Contribute to a culture of quality, curiosity and continuous improvement within the team.

Take an active role in retrospectives, technical discussions and team learning.

Contribute to internal knowledge-sharing, engineering playbooks and communities of practice.

Benefits and culture

This role offers a competitive salary alongside a company pension and clear opportunities for ongoing growth.

We foster an inclusive, supportive culture where engineering excellence, personal development and innovation are valued - and where people are trusted to deliver meaningful impact in a collaborative, open environment.

Apply for the job

Do you want to join our team? Then we'd love to hear about you!