Senior Scala Engineer – Equity Derivatives Tech VP

Citigroup; Greater London; Hybrid; GBP 62,000 - 102,000; Full time

Benefits offered by this job

Private medical care

Life insurance

Pension plan

Employee learning resources

Annual bonus

Job summary

Citi in London is seeking a senior software engineer to join the Equities Technology and Citi Investment Strategies Engineering group. You will help build, maintain, and scale the SolstiCE index calculation platform for CIS, driving a bold multi-year transformation across execution, prime, and margining.

The role combines hands-on coding with architecture evolution and cross-team collaboration. The successful candidate will have strong Scala/Python, REST/messaging experience, and a track record

Qualifications

• Hands-on senior software development experience.
• Proven ability to define technical architectures and deliver complex projects.
• Proficiency in object-oriented and functional programming.
• Rigorous application of clean code and TDD.
• Ability to work independently and in teams in a fast-paced environment.
• Excellent communication and multi-priority management.
• Strong interest in solving engineering challenges and learning new technologies.
• Proficiency in Scala and Python.
• Expertise in REST APIs and message queues (Solace).
• Understanding of multi-threaded programming.
• Experience with OpenShift and containerised deployments.
• Bachelor's degree in CS/Engineering or equivalent experience.

Responsibilities

• Define projects with stakeholders and set priorities.
• Evolve SolstiCE architecture, data flows, and integrations.
• Design new core functionality and features.
• Deliver enhancements to expand product coverage.
• Ensure system robustness and stability.
• Coordinate responses to production issues.
• Mentor less experienced team members.

Skills

Senior level experience

Software architecture

OO and functional programming

Clean code & TDD

Communication skills

Scala & Python

REST APIs & messaging

Multi-threaded programming

NoSQL (Couchbase)

Gradle & CI/CD

OpenShift

Containerised apps

Education

Bachelor's degree in CS/Engineering or related field

Tools

Gradle

Jenkins

Tekton

OpenShift

Couchbase

Job description

Salary: £62,000 - 102,000 per year

Requirements:

• We require hands-on professional software development experience at a senior level.
• We require proven experience defining technical architectures and leading complex projects through to delivery.
• We require proficiency in object-oriented and functional programming.
• We require rigorous application of clean code and TDD principles.
• We require the ability to work independently and as part of a team in a fast-paced, rapidly changing environment.
• We require excellent communication skills and the ability to manage multiple priorities simultaneously.
• We require a strong interest in solving engineering challenges and learning new technologies.
• We require proficiency in Scala and Python.
• We require expertise in component integration via REST APIs and message queues such as Solace.
• We require a thorough understanding of multi-threaded programming.
• We require working knowledge of NoSQL databases such as Couchbase.
• We require the ability to create and maintain project builds using Gradle and CI/CD pipelines using Jenkins and Tekton.
• We require experience building and deploying containerised applications, for example using OpenShift.
• We require a bachelors degree in computer science, engineering, or a related software programming or systems engineering field, or equivalent experience.

Responsibilities:

• We work with business stakeholders and business analysts to define new projects, ensure requirements are complete, and agree priorities.
• We evolve SolstiCE technical architecture, data flows, and integrations with upstream and downstream systems.
• We design new core functionality.
• We implement and deliver new features to expand product and use‑case coverage and increase system adoption for critical business processes.
• We ensure ongoing system robustness and stability.
• We coordinate our teams response to production issues.
• We coach and mentor less experienced team members to improve the standard of work.

Technologies:

• CI/CD
• Gradle
• Support
• Jenkins
• LESS
• Network
• NoSQL
• OpenShift
• Python
• REST
• Scala
• TDD
• AI

More:

We are Citi, and our Tech team is helping redefine global finance at scale, with systems that support business across 180+ countries and process trillions of dollars through our network every day. We are hiring for our Equities Technology and Citi Investment Strategies Engineering group in London, where our SolstiCE team develops, maintains, and supports an index calculation platform for the CIS business. This senior software engineering role is part of a bold multi-year transformation to build a best-in-class global platform across execution, prime, clearing, and cross-product margining. We offer a business casual workplace with a hybrid working model of up to 2 days working at home per week, a competitive base salary, an annual performance-related bonus, 27 days annual leave plus bank holidays, private medical care and life insurance, employee assistance support, a pension plan, paid parental leave, employee discounts, and access to extensive learning and development resources. We are committed to an inclusive workplace where everyone can feel comfortable, supported, and empowered to thrive.

last updated 36 week of 2026