Senior Kotlin Engineer

Globawise Group; United Kingdom; Hybrid; GBP 50,000 - 80,000; Full time

Benefits offered by this job

Competitive salary

Professional growth opportunities

Hybrid working model

Collaborative culture

Job summary

Globawise Group is seeking a Senior Kotlin Engineer to develop high-performance backend services and influence architectural decisions within a leading UK FinTech. You'll collaborate across teams, write clean, maintainable code, and work within complex financial domains.

The role offers competitive compensation, professional growth, and a hybrid working model, making it an exceptional opportunity to contribute to innovative financial products.

Qualifications

• Strong commercial experience with Kotlin.
• Ability to write clean, simple, maintainable code.
• Solid experience with relational databases (PostgreSQL or similar).
• Understanding of software architecture and abstraction principles.
• Experience writing comprehensive automated tests.
• Ability to understand and work within complex financial domains.

Responsibilities

• Develop and maintain high-performance backend services in Kotlin.
• Participate in collaborative design forums and influence architecture.
• Build and integrate APIs for financial products and market expansion.
• Deliver simple, maintainable, well-tested code.

Skills

Commercial experience with Kotlin

Ability to write clean, simple, maintainable code

Experience with relational databases (PostgreSQL)

Understanding of software architecture principles

Experience writing automated tests

Comfort in complex financial domains

Tools

Kotlin (1.7+)

AWS

GraphQL

Job description

At Globawise, we empower technologists to thrive by connecting them with roles that deliver both impact and long-term growth.
We’re partnering with a high-performing UK FinTech that continues to redefine modern lending and credit infrastructure. Backed by strong market success and ongoing product expansion across the UK and US, their engineering team - now 80+ strong - is building the next generation of financial products, including lending platforms, credit cards, auto-finance solutions, and new launches planned for this year.
As a Senior Kotlin Engineer, you’ll join a newly forming pod with the opportunity to influence architectural decisions, shape design discussions, and help deliver elegant solutions to complex financial challenges. This is a role for an engineer who not only writes clean, idiomatic Kotlin but also elevates those around them through collaboration and thoughtful technical leadership.

What You’ll Do

Develop and maintain high-performance backend services in Kotlin, contributing to APIs, internal tooling, and new product capabilities.

Shape Architecture & Engineering Standards

Participate in collaborative design forums across engineering and business teams, influencing architectural decisions and system evolution.

Support Product Expansion

Build and integrate APIs supporting collections functionality, new financial products, and US market expansion.

Write Clean, Tested Code

Deliver simple, maintainable, well-tested code across all layers of the testing pyramid using modern Kotlin testing frameworks.

Collaborate Across the Business

Work closely with stakeholders across product, operations, and engineering to deeply understand complex financial domains and translate them into scalable systems.

Who You Are

• You write elegant, idiomatic Kotlin and value simplicity in design.
• You understand that great engineering is about people, not just code.
• You’re comfortable navigating complex financial domains and abstract system design.
• You think critically about architecture and understand trade-offs between quality and speed.
• You’re collaborative, pragmatic, and motivated to continuously improve yourself and your team.
• You can solve problems independently but know when to involve others.

Tech Stack You’ll Work With

• Kotlin (1.7+)
• AWS
• GraphQL (nice to have)

Frontend Ecosystem (Context Awareness)

• React & React Native
• TypeScript
• Gradle
• JUnit Jupiter
• Kotest
• TestContainers

Qualifications

Must-Have

• Strong commercial experience with Kotlin
• Ability to write clean, simple, maintainable code
• Solid experience with relational databases (PostgreSQL or similar)
• Understanding of software architecture and abstraction principles
• Experience writing comprehensive automated tests
• Ability to understand and work within complex financial domains

Nice-to-Have

• Experience with NoSQL databases
• Familiarity with GraphQL
• Experience working in FinTech or regulated environments
• Experience with Kanban or flow-based agile methodologies

What We Offer

At Globawise, we don’t just offer jobs — we provide launchpads for your career:

Top-Tier Compensation – Competitive salary and benefits aligned with your experience. High-Impact Work – Help scale one of the UK’s most successful FinTech platforms. Collaborative Culture – Join a team that values alignment, shared learning, and strong relationships. Professional Growth – Work in an environment that encourages continuous improvement and architectural ownership. Hybrid Flexibility – A balanced working model supporting both collaboration and focused deep work.

Ready to Engineer the Future of FinTech?

If you enjoy solving complex domain challenges, shaping architecture, and writing elegant Kotlin in a high-trust engineering culture – we’d love to meet you.

Apply now and let’s build something exceptional together.