Senior Software Engineer (Java / Kotlin)

Runa; Greater London; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid London office 3 days per week

£1,000 annual L&D allowance

25 days holiday + public holidays

Runa Reset Days

Summer Hours

Work from anywhere 45 days a year

Employee Options pool

Private Medical + Dental Health

Enhanced parental leave

Salary transparency discussion

Job summary

Runa is hiring a Senior Software Engineer to design, implement and deploy backend services. You will work with Java and Kotlin in an event-driven, containerised cloud environment, guiding junior engineers and shaping architecture across distributed systems.

You will join a hybrid London team, building scalable payment infrastructure with modern tooling (Kafka, AWS, Terraform) to move money efficiently and securely for customers worldwide.

Qualifications

• Proficiency in Java or Kotlin and Spring framework.
• Experience with event-driven architectures and microservices.
• Hands-on experience with containerisation and cloud infrastructure.

Responsibilities

• Architect, implement and deploy software services end-to-end.
• Mentor junior engineers and contribute to system design reviews.
• Build scalable, reliable services running on AWS with container orchestration.

Skills

Java

Kotlin

Spring

Architecture design

Tools

Kafka

EventBridge

SQS

Kubernetes (Helm)

Terraform

AWS

Job description

Runa is pioneering a first-of-its-kind payment rail that enables the seamless, global money movement at scale. Legacy banking and payment infrastructure struggles to support the demands of today's low-volume, high-velocity payouts, leading to inefficiencies in global payouts. Businesses worldwide send over $20 trillion annually in rewards, remittances, and disbursements often incurring costs of up to 50% per transaction and subjecting recipients to lengthy delays.

Runa transforms this landscape by providing a new digital payments infrastructure that empowers businesses to send digital money instantly and cost-free to anyone, anywhere. The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards. Leading companies such as Sodexo, TopCashback, Perkbox, Sweatcoin, Coinbase, and Globetopper rely on Runa to facilitate instant, flexible global payouts to tens of millions of consumers.

The Role

As a Senior Software Engineer, you will be responsible for architecting, implementing and deploying software services from end to end. You'll produce clean, scalable, and reusable code to build products which will have a big impact on our customers.

You will have the opportunity to work with a modern, event-driven architecture running on containerised cloud infrastructure, whilst guiding and mentoring more junior engineers in the team.

Our Tech

We will be building with Java and Kotlin, leaning heavily on event-driven architectures to move money reliably at scale. Services will run in containers on EKS, backed by both SQL and NoSQL databases on AWS.

If you're deep in the Java and Spring ecosystem (Spring Boot, Spring REST, Spring Data, resilience patterns like circuit breakers), you'll feel right at home. Experience with event-streaming and messaging tools like Kafka, EventBridge, SNS or SQS, Kubernetes tooling such as Helm, or infrastructure as code with Terraform will help you ramp up even faster.

What Excites You

• Contributing towards the design, delivery and deployment of large scale, complex projects which are used heavily by thousands of people with high throughput.
• Using modern technology like event-driven microservice architecture and container orchestration on AWS.
• Mentoring more junior members of the team to help support their growth and development and help scale the team by leading on technical interviews.
• Being a subject matter expert on technology and domain-specific problems, and taking ownership of software services from end to end.
• Improving responsiveness and overall performance of our web services.
• Getting stuck into problems at the heart of how money actually moves, in the payments space.

What Excites Us

• Proficiency in at least one of Java, or Kotlin, with a strong track record of architecting and developing new services and features end to end.
• Experience building applications with event-driven architectures.
• Familiarity with containerisation (e.g. EKS or similar).
• Knowledge of cloud platforms, ideally AWS.
• Working knowledge of both SQL and NoSQL databases.
• The ability to take ownership of design and architecture of large scale systems and developing API heavy software solutions without the need for guidance.
• A passion for promoting software engineering best practice, guiding and mentoring more junior engineers to deliver clean, scalable, and reusable code.
• Proactively contributing to the continual improvement of our engineering processes.

Bonus points for

• Deep experience with Java and the Spring ecosystem (Java 17+, Spring Boot, Spring REST and Spring Data, resilience patterns such as circuit breakers).
• Experience with event-streaming and messaging technologies (e.g. Kafka, EventBridge, SNS, SQS).
• Familiarity with Kubernetes tooling such as Helm.
• Experience with infrastructure as code, ideally Terraform.
• Experience within the payments domain.

What's in it for you

• We have a hybrid structure with the requirement of 3 days a week at our London Office (Shoreditch)
• £1,000 annual L&D allowance to invest in mastering your craft, including accredited studies. Plus 5 L&D days per year
• 25 days holiday + public holidays
• Runa Reset Days - Runa closes on the first Friday of each quarter for a well-deserved, Reset Day
• Summer Hours - In the month of August, we log off at 3pm on Fridays.
• Work from anywhere for up to 45 calendar days a year
• Participation in the Employee Options pool giving you ownership in Runa
• Private Medical + Dental Health Insurance with Bupa
• Enhanced parental leave for all new parents, up to 16 weeks full pay
• We are currently working towards salary transparency however we are not there just yet so our talent team will discuss this during the initial call to ensure that the right expectations are given.

The Interview Process

• Call with Talent Lead
• System Design Interview
• Coding Interview
• Values Interview

Diversity and Inclusion

We are committed to providing a hiring and working experience in which all people feel they are equally respected and valued regardless of race, religion, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.