Senior/Principal Kotlin Developer

Grid Dynamics Holdings; City Of London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A global investment bank is seeking to expand its core engineering team as part of a strategic risk system replatforming program. Candidates should have strong hands-on experience with Kotlin and a proven track record working with large-scale data systems. The role involves design, development, and collaboration across teams to ensure a high-performance architecture. The position offers a competitive salary, flexible schedule, and a range of benefits.

Benefits

Opportunity to work on bleeding-edge projects

Work with a highly motivated team

Competitive salary

Flexible schedule

Medical insurance

Sports benefits

Corporate social events

Professional development opportunities

Well-equipped office

Qualifications

• Strong hands-on experience with Kotlin.
• Proven experience working with large-scale data systems in production.
• Solid grasp of software engineering best practices, including TDD and CI/CD.
• Background in high-availability or mission-critical systems is an advantage.

Responsibilities

• Design, develop, and maintain core components of the new risk platform.
• Apply Test-Driven Development practices to ensure high reliability.
• Work with very large data volumes in a high-pressure production environment.
• Collaborate across teams to improve performance and ensure robustness.

Skills

Kotlin

Test-Driven Development (TDD)

Large-scale data systems

Software engineering best practices

Job description

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Join the core engineering team on a multi-year strategic risk system replatforming programme for a leading global investment bank. You'll be responsible for building key components within a highly scalable, risk-tolerant architecture that underpins critical business operations across the organization.

Essential functions

• Design, develop, and maintain core components of the new risk platform using Kotlin.
• Apply Test-Driven Development (TDD) practices to ensure high reliability and maintainability.
• Work with very large data volumes in a high-pressure production environment.
• Collaborate across teams to define architecture, improve performance, and ensure robustness.

Qualifications

• Strong hands‑on experience with Kotlin.
• Proven experience working with large‑scale data systems in production.
• Solid grasp of software engineering best practices, including TDD and CI/CD.
• Background in high‑availability or mission‑critical systems is an advantage.

Would be a plus

Previous experience in the financial domain.

We offer

• Opportunity to work on bleeding‑edge projects
• Work with a highly motivated and dedicated team
• Competitive salary
• Flexible schedule
• Benefits package - medical insurance, sports
• Corporate social events
• Professional development opportunities
• Well‑equipped office

About us

Grid Dynamics (NASDAQ: GDYN) is a leading provider of technology consulting, platform and product engineering, AI, and advanced analytics services. Fusing technical vision with business acumen, we solve the most pressing technical challenges and enable positive business outcomes for enterprise companies undergoing business transformation. A key differentiator for Grid Dynamics is our 8 years of experience and leadership in enterprise AI, supported by profound expertise and ongoing investment in data, analytics, cloud & DevOps, application modernization and customer experience. Founded in 2006, Grid Dynamics is headquartered in Silicon Valley with offices across the Americas, Europe, and India.