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Backend engineer building the core of a cryptocurrency trading platform: Java-based trading infrastructure, RESTful/WebSocket APIs for market data and order execution, and a high-concurrency 7x24 trading system. Stack centers on Java, Spring Boot/Cloud, MyBatis, Redis, Kafka, and Elasticsearch.
Develops and optimises real-time embedded C/C++ software for 5G NR PHY platforms on ARM-based embedded Linux, collaborating with PHY, hardware and system teams and applying SIMD, multithreading and hardware acceleration to meet real-time constraints. Hybrid working in Southampton, UK.
Designs and builds scalable Python backend systems — REST APIs, MongoDB/Redis data models, and distributed systems — powering AI-driven products for investment firms and financial institutions. Shapes technical direction, mentors engineers, and works hybrid in New York City.
Senior backend engineer who designs, builds, and scales Java/Spring Boot microservices and RESTful APIs — working on service communication, asynchronous messaging, database tuning, security (OAuth2/JWT), and resiliency patterns in distributed, containerised environments.
Hands-on backend Java role at a scaling FinTech in Newcastle, modernising a C++ trading system into a scalable, high-performance real-time Java platform for Front Office traders. Involves architectural ownership and use of AI-assisted tools like Claude; salary up to £120k plus bonus.
Saransh Inc is hiring a Java Full Stack Developer in Montreal (onsite from day 1) to modernize a market risk limit monitoring system into Java Spring Boot microservices communicating via Kafka, backed by MongoDB and an in-house React-based UI framework. Day-to-day work spans Core Java, Spring, REST APIs, and React front-end development.
Contract, onsite (from day 1) backend developer role in Montreal building server-side applications with Core Java and the Spring ecosystem (Spring MVC, Spring Boot, REST APIs, JSON). Candidates need strong CS fundamentals and DevOps tooling experience (Git, Jenkins, JIRA); Kafka and MongoDB are nice-to-haves.
Design, build, and maintain scalable, highly available Java backend applications, APIs, and microservices, including performance tuning, production troubleshooting, code reviews, and mentoring junior developers. Requires 7+ years of Java experience (Core Java, JVM, concurrency), REST APIs, and relational databases; Spring Boot, Kafka, Docker/Kubernetes, and cloud platforms are pluses.
Senior Core Java developer building and maintaining high-performance, low-latency trading and capital markets (debt markets) systems in a 4-day hybrid Toronto role. Core stack: Core Java, Spring/Spring Boot, multithreading, SQL with caching (MemSQL/Redis), and cloud deployment on AWS/Azure.
Senior Java Developer building API integrations for email data exchange and deploying GenAI/LLM-powered products. Key technologies include Java 8+, Spring Boot, Kubernetes, MCP Protocol, and prompt engineering within a hybrid Halifax-based environment.
A senior server-side Java developer role in Toronto (hybrid, 4 days onsite) building low-latency electronic trading and fixed-assets systems. Day-to-day work centers on multithreaded Java, multicast messaging (Solace/RV), GridGain-style caching, relational databases, and Maven/Jenkins DevOps pipelines.
Senior Core Java Engineer responsible for designing and supporting high-performance enterprise applications and distributed systems. Core technologies include Java 8/11/17+, multithreading, RESTful APIs, and relational databases like Oracle or PostgreSQL.
Long-term contract (12+ months) for a senior-to-lead Java Full Stack / Backend Developer in Montreal, onsite 3 days a week. Day to day involves building enterprise Java/Spring systems with Kafka messaging, distributed caching, event-driven/REST services, Docker, and CI/CD pipelines; 6–12 years of experience required.
Core Java Developer (placed via staffing firm Cynet Systems) building real-time, low-latency, multi-threaded server-side applications using Java 8+, Spring, J2EE, and web services, with SQL Server/Sybase/Oracle databases. On-site role in Anjou, Canada.
Mid-level (3-5 yrs) Core Java developer role at a London FinTech (recently acquired by a capital markets firm), hybrid 3 days a week in the office. Day to day you build software from scratch without frameworks like Spring, focusing on multithreading, data structures and algorithms, with cloud-agnostic deployment across GCP and AWS. Salary up to £100k plus bonus.
At Alstom, we understand transport networks and what moves people. From high-speed trains, metros, monorails, and trams, to turnkey systems, services, infrastructure, signalling and digital mobility, we offer our…
Java Developer at Yazaki's Ovar plant in Portugal, building and maintaining backend services with Java/Spring Boot and desktop applications with Swing/JavaFX. The role covers REST/SOAP integrations, security, CI/CD deployments, testing, documentation, and Agile collaboration with business teams.
Hybrid Java full-stack developer role at Capgemini in London, focused on building secure, scalable software for banking-domain clients. Day to day involves Java 17/Spring Boot microservices, React or Angular frontends, AWS serverless components, and Kafka, within agile CI/CD teams.
Capgemini is hiring a Java Software Engineer in Singapore to develop enterprise backend services and microservices using Java (JDK 17+), the Spring ecosystem, and Kafka, handling everything from API design to L3 production support. The role emphasizes security, performance tuning, and compliance for financial-system work, in collaboration with cross-functional teams.
Senior backend engineer at Capgemini's Montreal office who designs, builds, and supports high-performance, scalable enterprise Java applications and microservices. Day-to-day work centers on Core Java, Spring/REST services, relational databases, performance tuning, code reviews, and mentoring junior developers in an Agile team.
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