Caspian One

About the Company

Caspian One are an international professional services company. We solve technology-driven, resource-based and project-delivery challenges that demand speed, scale and commercial flexibility. Empowering individuals and organisations to optimise their full potential.

Put simply – we deploy specialist resources and niche technology teams to deliver projects in ways that best suit the needs of our clients. These SMEs are working to decommission, migrate, build, and implement tech that gives our clients the competitive edge.

We offer three distinct but integrated services: Resource Augmentation, Specialist Skills Acquisition, and Managed Outcomes - blending the best technical expertise with execution excellence.

In Financial Services technology, Caspian One is known for agility, market insight, and integrity. Successes can be linked to our hybrid delivery models and deep foundations formed over two decades at Investment Banks, Hedge Funds, Prop Trading Firms and Crypto clients. Across North America, USA, UK, EMEA, APAC.

Most profound expertise:

• Front Office Technology,
• Complex Trading,
• Data & Analytics,
• Application Development,
• Infrastructure,
• Cyber Security,
• and Change Management.

Within Broadcast Media our teams play a pivotal role in modernising the industry, supporting system integrations, tech transformations, and new platform development - while adeptly navigating the challenges of mission-critical system upgrades and technology transitions. We service over 150 global clients, including broadcasters, telcos, content owners, service providers and technology manufacturers. Join us at linkedin.com/caspian-one-broadcast-media

Central to our success is a vibrant company culture in which diversity of thought, accountability, and authentic experiences are valued. A culture that not only drives our internal operations but also shapes engagements with clients - the embodiment of professionalism, teamwork, and recognised specialism.

Listed Jobs

Company Name

Caspian One

Job Title

Java Swing Developer

Job Description

**Job Title**: Java Swing Developer **Role Summary**: Design, implement, and optimize the user interface of a high‑performance desktop trading platform that handles real‑time FX, cash, deposits, futures, and swaps. The role focuses on maintaining a multithreaded, low‑latency Swing UI while preparing the system for a future microservices transition. **Expectations**: - Deliver reliable, performant UI components for mission‑critical trading operations. - Collaborate closely with backend teams to integrate via bespoke TCP workflows. - Lead the decoupling of the Swing front‑end from the existing monolith and support its migration to a microservices architecture. **Key Responsibilities**: - Enhance and maintain the Java Swing UI for trading and risk management functions. - Develop multithreaded, high‑memory modules, ensuring thread safety and latency targets. - Interface with backend services over custom TCP protocols. - Design and implement strategies for UI and service decoupling, facilitating a future microservices rollout. - Conduct performance profiling, memory analysis, and code optimization. - Produce clean, well‑documented, unit‑tested code following industry‑wide design patterns. - Review peers’ changes and maintain rigorous code quality standards. **Required Skills**: - Proficient in core Java (Java SE) and Java Swing UI development. - Strong experience with multithreaded and concurrent programming. - Deep understanding of performance tuning, memory management, and profiling tools. - Familiarity with design patterns (e.g., MVC, Observer, Factory). - Knowledge of microservices concepts and architectural patterns; enthusiasm to adopt modern stacks. - Excellent debugging, problem‑solving, and communication abilities. **Nice to Have**: - Domain knowledge of FX, fixed income, and derivatives markets. - Experience with Order Management Systems (OMS), algorithmic trading, and FIX protocol. **Required Education & Certifications**: - Bachelor’s degree in Computer Science, Software Engineering, or a related technical field (or equivalent professional experience). - Oracle Certified Professional, Java SE (or comparable certification) is a plus. ---

London, United kingdom

Hybrid

12-01-2026

Company Name

Caspian One

Job Title

AS400 Developer

Job Description

**Job Title:** AS400 Developer **Role Summary:** Specialist responsible for the development, maintenance, security, and support of applications on IBM i (AS400) platforms. Works closely with product and cross‑functional teams to translate business requirements into technical solutions, improve operational processes, and ensure high‑quality delivery. **Expectations:** - Minimum 7 years of hands‑on AS400 development experience. - Proven ability to work independently, solve complex problems creatively, and deliver results in both Waterfall and Agile/Scrum environments. - Strong commitment to quality, customer service, and continuous improvement. **Key Responsibilities:** - Design, code, test, and maintain applications using RPG/LE, COBOL/400, SQL, CLP/CLLE, and related IBM i technologies. - Collaborate with product owners and team members to gather requirements and produce technical specifications. - Conduct problem analysis, data mapping, and use‑case modeling; produce clear documentation. - Identify and resolve defects, performance bottlenecks, and operational inefficiencies. - Participate in Agile ceremonies (sprint planning, stand‑ups, retrospectives) and utilize JIRA for task tracking. - Support integration and middleware components such as MQ, Data Queues, SFTP, and IFS. - Contribute to knowledge sharing and mentor junior developers as needed. **Required Skills:** - RPG/LE, COBOL/400, SQL, Query/400, QM Query, ASC Sequel, CLP/CLLE. - Experience with DB2/400, TAATOOL, RDI, Arcad, MQ, Data Queues, SFTP, IFS. - Proficiency with JIRA, ServiceNow, and version‑control/issue‑tracking tools. - Strong analytical, problem‑solving, and documentation skills. - Ability to work effectively in both Waterfall and Agile/Scrum methodologies. **Required Education & Certifications:** - Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent practical experience). - IBM i (AS400) certifications or relevant professional training are preferred but not mandatory.

Toronto, Canada

On site

Senior

20-01-2026

Company Name

Caspian One

Job Title

C# React Full-Stack Developer

Job Description

**Job Title:** C# React Full‑Stack Developer **Role Summary:** Senior .NET / React developer contracted for a leading global financial institution. Responsible for enhancing, maintaining, and extending business‑critical desktop and background applications and creating new React admin interfaces. Works within a small, collaborative team to support architecture improvements and cross‑functional deployments. **Expectations:** - 6‑month contract with potential extensions. - Hybrid work model: 50 % office time. - Day rate up to £850. **Key Responsibilities:** - Maintain and enhance two desktop applications (WPF/.NET launcher & background alerting system). - Develop new React admin screens for expanding business units. - Participate in architecture improvements for broader deployment. - Collaborate closely with a 3‑developer team. - Process system events in event‑driven messaging environments. **Required Skills:** - Strong .NET (C#) and React development experience. - Proficient with event‑driven architectures, asynchronous programming, and multi‑threading. - Familiarity with messaging systems and background processing. - Ability to handle both front‑end and back‑end development tasks. - Experience in financial services applications (domain knowledge preferred but not essential). - Independent, self‑directed work style within a small team. **Required Education & Certifications:** - Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent professional experience).

London, United kingdom

On site

22-01-2026

Company Name

Caspian One

Job Title

KDB Developer

Job Description

**Job Title** KDB Developer **Role Summary** Design, build, and maintain production‑grade KDB/Q systems for front‑office trading, risk, and compliance functions within a tier‑one financial services environment. Collaborate in small, high‑performance teams to support enterprise‑scale, multi‑asset‑class data platforms and contribute to a long‑term KDB roadmap. **Expectations** - Deliver robust, performant KDB solutions that operate in live production environments. - Engage cross‑functional teams (trading, risk, compliance) and adapt to evolving data and performance requirements. - Maintain code quality, adhere to best practices, and align with engineering standards. **Key Responsibilities** - Develop and optimize KDB/Q code for data ingestion, storage, and real‑time querying. - Debug, troubleshoot, and enhance existing KDB systems to meet operational SLAs. - Write efficient Q scripts & functions, manage schema changes, and ensure data integrity. - Collaborate with data, analytics, and business stakeholders to translate requirements into KDB solutions. - Participate in code reviews, pair‑programming sessions, and continuous improvement initiatives. - Contribute to the long‑term KDB roadmap, identifying opportunities for performance and scalability improvements. **Required Skills** - 3+ years of hands‑on KDB/Q development in production environments. - Strong proficiency in Q language, including complex querying, materialized tables, and event‑driven logic. - Experience scaling KDB to enterprise‑level workloads across multiple asset classes. - Knowledge of financial data structures and trade lifecycle concepts. - Python programming experience is advantageous. - Strong problem‑solving skills, attention to detail, and a collaborative mindset. **Required Education & Certifications** - Bachelor’s degree in Computer Science, Finance, Engineering, or a related technical field (or equivalent practical experience). - No specific certifications required; certification in KDB/Q or relevant financial data platforms is a plus.

Toronto, Canada

Hybrid

10-02-2026