Senior Java/Kotlin Engineer – Equity Prime Finance
London | Hybrid | Tier 1 Investment Bank
The Opportunity
We are partnering with a Tier 1 investment bank on a major, multi-year Equity Accelerator programme focused on modernising its Prime Finance Equities platform.
The programme is re-engineering core trading and post-trade systems, introducing new data and market-expansion platforms, and enabling advanced client capabilities including cross-margining and credit financing.
You’ll be working within a live, financially significant production environment, replacing legacy architecture with modern event-driven, cloud-native systems designed for institutional-grade stability, throughput and extensibility.
This is not a general-purpose Java development role. The team requires engineers with strong technical depth, genuine capital-markets experience and the ability to operate autonomously within a complex production environment.
Essential functions
The Role
As a Senior Java/Kotlin Engineer, you’ll contribute to the re-engineering of core Prime Finance trading and post-trade systems across the JVM ecosystem.
You’ll work closely with experienced engineers and business stakeholders, contributing to architectural decisions, modernising legacy components and building highly resilient services capable of handling complex financial workflows and market-driven events.
Key Responsibilities
Re-engineer core trading and post-trade systems using Java and Kotlin
Design and develop event-driven, message-based and event-sourced systems
Design for failure handling, ordering guarantees, replay semantics and data integrity
Modernise and refactor large-scale legacy systems while maintaining production stability
Build data and market-expansion platforms supporting the wider Equity Accelerator programme
Develop technology supporting advanced capabilities such as cross-margining and credit financing
Apply TDD and shift-left testing throughout the development lifecycle
Build local-first automated tests using containerised dependencies
Deliver through trunk-based development and CI/CD
Support frequent, zero-downtime production releases
Work directly with business stakeholders and upstream/downstream teams to develop strong domain knowledge
Analyse complex production behaviour and resolve technically challenging issues
Use AI-assisted and agentic development tools to accelerate legacy analysis, refactoring, testing and prototyping
Contribute to technical design discussions and challenge decisions constructively where appropriate
Qualifications
Essential Experience
Expert-level Java development experience
Strong experience with Kotlin, or a clear appetite to develop in Kotlin
Strong understanding of multi-threading, concurrency and performance
Hands-on experience designing and developing event-driven systems
Practical understanding of message passing, event sourcing, failure handling, ordering and replay
Proven Test-Driven Development (TDD) experience
Strong automated testing and design-for-testability practices
Experience within capital markets, trading or post-trade environments
Strong understanding of areas such as:
Trade lifecycle
Trade booking
Position management
Cashflow calculation
Settlement and wires
Client reporting
Financial accounting principles
Experience modernising and refactoring large-scale legacy systems
Genuine experience working with iterative delivery, trunk-based development and CI/CD
Experience delivering frequent, reliable zero-downtime production releases
Ability to work autonomously within complex production environments
Strong communication skills and the confidence to contribute to architectural and technical decisions
Technology Environment
Java | Kotlin | JVM | Event-Driven Architecture | Event Sourcing | Kafka | SQL Server | T-SQL | MongoDB | Kubernetes | OpenShift | Cloud | OpenTelemetry | ELK | Grafana | CI/CD | TDD | Git | Trunk-Based Development | Docker | AI-Assisted Development
The Opportunity
This is an opportunity to work on a strategic, multi-year transformation at the heart of a global Prime Finance business, rather than simply maintaining an existing application.
You’ll gain deep exposure to Equity Prime Finance, trading and post-trade technology, work alongside highly experienced engineers and play a meaningful role in replacing legacy systems with modern, resilient and scalable architecture.
If you’re a senior Java engineer who combines deep engineering ability with genuine capital-markets domain knowledge, this is an opportunity to work on technically challenging systems with significant business impact.
Would be a plus
Highly Desirable
Prime Brokerage experience
Synthetic / Swap or Cash Equity operational flows
Corporate Actions
Regulatory reporting, including 871(m), EMIR or MiFID
Integration with risk and valuation systems
Strong SQL Server / T-SQL experience
Database schema design and performance tuning
Kafka or equivalent event-streaming platforms at scale
MongoDB
Kubernetes / OpenShift
Cloud-native operational practices
OpenTelemetry, ELK and Grafana
AI-first development using agentic coding tools for legacy analysis, refactoring and test generation
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.Apply to the position
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Grid Dynamics is an equal opportunity employer. We are committed to creating an inclusive environment for all employees during their employment and for all candidates during the application process.
All qualified applicants will receive consideration for employment without regard to, and will not be discriminated against based on, age, race, gender, color, religion, national origin, sexual orientation, gender identity, veteran status, disability or any other protected category. All employment is decided on the basis of qualifications, merit, and business need.