London OR Dublin Engineering Full-time

Principal Software Engineer (Corda Availability & Performance)

At R3 we’re planning to change the world. You will be working at the cutting edge of permissioned blockchain and distributed ledger technology (DLT) as it transforms the future of business.
Corda is a DLT designed for running complex workflows between businesses, without any centralized points of control. You will work on a blockchain/DLT platform trusted by banks, insurance companies, stock exchanges, payments companies, and others – highly demanding industries with the interesting technical challenges that come with them.
You will join the Corda Business Unit to help us build the Corda of the future – a distributed ledger with huge throughput, reliability and uptime guarantees for the most demanding of R3 customers, and networks of customers.
As part of the team, you will:
• Act as a technical leader with specific focus on high-availability, scalability, and performance non-functional Corda requirements.
• Design, and coach our engineering team in the design of, highly-available, scalable enterprise systems.
• Work with industry-leading technologies to build the most robust version of Corda to date.
• Collaborate with Corda’s engineering teams to help produce a highly available, horizontal scaling, multi-tenant version of Corda, working right from the bottom peer-to-peer messaging layer up to the flow engine and ledger layer Corda has become known for.
• Engage with our Product Managers, QA teams, and Test Tooling teams to refine non-functional requirements around scalability, performance, and high availability, plus ensure that test plans and tooling are sufficiently aligned.
• Work with Corda teams to build and refine KPI metrics that describe Corda’s availability, performance and ability to scale. Guide Engineering team on how best to use these KPIs, and other internal metrics, to run operational reviews.
• Help identify areas in which we can improve Corda and its associated components.
• The role of a Principal Engineer spans many different areas of development. At times you will work with our existing development teams to help them understand how best they can solve the problems they are working on. At other times you will help identify high-value areas that could benefit from new R&D activities that you will lead.
• No team is an island. You will work with many others across the R3, to help ensure we build the best possible products and deliver the highest value for our customers. You will get to showcase your work and help influence thinking across company.
About you
You are a highly motivated, self-sufficient software engineer with outstanding design and implementation skills. You have a strong grasp of computer science fundamentals, either through formal study or via some other route. You are curious and quick to learn about new technologies, and keen to build on your skills by learning on the job. You have built complex distributed systems previously.
You have a proven track record of designing and building large distributed enterprise systems that are highly availability and horizontally scalability, and a strong grasp on performance analysis and optimization. You have led or participated in operational reviews of such systems. You know the importance of vending appropriate metrics and BI capabilities that can describe the customer experience of software systems, so that continual improvements can be made.
You are confident to be able to get into the details of software being developed by other teams, but you are also ready to define entirely new software, be the person who can develop the first versions of that new software, and then guide others on how to develop it further.
We know the best engineers can adapt to and learn any language, but we are primarily a Kotlin house and so you have, or will gain, extensive JVM knowledge, (garbage collection tuning, performance and memory profiling), and/or familiarity with the Java ecosystem.
We believe that quality, security, developer experience, and operational experience are everyone’s responsibility, so you will be driven by a passion to ensure excellence in all of these.
You are a blended tactical and strategic thinker who understands clients’ needs.  You will have led or mentored teams in the past.
You will want to influences the thinking of senior stakeholders and help shape the technical direction of Corda and its associated ecosystem. You are largely self-managing.


  • You will design and implement highly complex software within the Corda ecosystem and will assist other teams in understanding how to best utilize the software you develop.
  • As a recognized expert both inside and outside R3, you will help promote the work you have been doing to help the company in delivering the best possible software.
  • You will mentor other engineers, enabling them to understand your approach to understanding and solving complex problems.
  • You will use well developed and comprehensive judgment to make decisions of high complexity and impact, utilising team opinion and senior leadership where needed but often use autonomy in decision making.
  • You will use well honed business analysis skills to interact with product management team(s) to marry technical delivery and client requirements.
  • You will use well developed customer focus skills to anticipate internal/external customer requests.
  • You will contribute to the technical direction and strategic vision of Corda engineering.
  • At R3, we encourage a diverse and inclusive workforce. If you don’t meet all of the above criteria, but you think you’d be a great addition to R3, send us your CV. We’re always interested in meeting collaborative people who are excited to work with us.

About us

R3 is a leading provider of enterprise technology and services for the development of multi-party solutions that enable direct, digital collaboration in regulated industries where trust is critical.

Our values

Customers first

Customer success is paramount. We build strong relationships and strive to create the best possible experience. Learn why so many of our customers view R3 as a trusted, long-term partner.


We bring together all parts of our ecosystem and give our customers the tools and environment to work together to change their industries.


We have the agility of a small company but the confidence and ambition of the industry-defining trailblazer we aspire to become. As a thought leader, R3 subject matter experts produce compelling analysis and insight into emerging technology.


We demand excellence and take pride in our products and services. We believe the Corda and Conclave platforms will transform the way the world does business.

Our benefits

We offer comprehensive and competitive benefits packages to ensure the wellbeing of all our employees and their loved ones. For a regional breakdown of our company benefits and perks, click here.

R3 may process the personal data collected or identified in accordance with R3’s Recruitment Privacy Policy. In particular, R3 will use the personal data provided for the purposes of processing your application for the role you have applied for, to assess your suitability for the role as well as to enter into a contract with you if you are successfully brought onto the R3 team.