Top Software Engineer Jobs in Belfast

Lead Bloomreach Professional Services integrations: design and implement solutions using Java and modern frontend frameworks, validate scope, assess technical risks, make architectural decisions, improve DXP add-ons and documentation, coach peers, and occasionally travel to EMEA clients.

Join a cross-functional agile team to design, build and test full-stack solutions using React, Node.js, Java/REST APIs and cloud platforms. Provide technical leadership, mentor engineers, solve complex problems, collaborate with product/QA/design, and promote engineering best practices while staying current with emerging technologies.

Lead design and implement new Elasticsearch search features, improve relevance and vector search (HNSW/IVF), fix bugs, collaborate across a distributed team, contribute to Lucene, and write idiomatic modern Java.

Design and develop software solutions from scratch, collaborating on government projects, and participating in the software development lifecycle.

Build and operate a managed PostgreSQL service for AI workloads: develop control plane and lifecycle automation in Go, tune PostgreSQL internals and ecosystem tooling, create migration tooling, integrate vector search, run SRE practices (SLOs, observability, incident response), and work directly with customers on architecture and escalations.

Lead backend and edge/IoT engineering, implementing scalable solutions and mentoring team members while collaborating with Data Science teams.

Design, implement, and maintain scalable Java-based software solutions. Collaborate across the SDLC with stakeholders and development teams, integrate DevOps and CI/CD practices, support operational tasks, ensure security and performance, drive feature development, conduct code reviews, and stay current with emerging technologies.

Lead Systems Engineer responsible for designing, implementing, and maintaining PLC/SCADA automation systems, industrial networks, and OT cybersecurity. Provides technical leadership, mentors teams, oversees system architecture, commissioning, risk assessments, and vendor/client coordination to deliver secure, standards-compliant projects on time and within budget.

Lead and grow an SDET team building reliable, scalable cloud storage solutions. Provide technical leadership, design and review architectures, plan sprints, implement deterministic functional and non-functional test suites in CI/CD/CT pipelines, collaborate on product specs, hire and mentor engineers, and continuously improve processes and systems.

Design and build extensible Dynamics 365 solutions: develop plug-ins, custom workflow assemblies and actions; implement integrations and concurrency handling; integrate Power Platform and Power BI; profile performance using Application Insights; and support CI/CD with Azure DevOps.

Own and deliver frontend trading features across web, mobile, and browser extension platforms. Lead new blockchain integrations and product initiatives, collaborate with product, design and trading teams, interface with users and developers, and help grow the engineering team and culture.

The Sr. Software Engineer (FE) will lead the development of scalable frontend applications using React. Responsibilities include systems design, testing strategy, performance optimization, AI integration, and mentoring.

Work on YDB distributed storage and database systems to maximize performance on modern and legacy hardware (NVMe, HDD, DPUs). Reengineer components for low-latency, high-throughput workloads, profile and debug production systems, and design resilient distributed storage primitives. Collaborate on incident resolution and production deployments to support Nebius cloud services.

Build and maintain a distributed, fault-tolerant, high-performance block and filesystem storage system. Work on virtualization (virtio-blk, virtio-fs, QEMU, vhost-user), high-throughput VM-to-storage networking (TCP, RoCEv2/RDMA), and core storage features like replication, consensus, self-healing, and data migration. Debug and optimize performance-critical I/O paths while writing reliable, maintainable code in a collaborative team environment.

The Senior Software Engineer will develop features for Phantom's web platforms, lead new product initiatives, interface with users, and contribute to team culture.

Design, deploy, and maintain scalable cloud infrastructure for ClickHouse. Collaborate with teams to enhance performance, reliability, and security of services.

Lead design, implementation, and end-to-end delivery of high-quality web features. Build and operate cloud-native services, write and review well-tested code, use observability and metrics, reduce technical debt, and align implementations with team architecture and scalability needs.

Develop microservices and cloud services for Magnify's platform, collaborate with data science, and lead complex software projects in a startup environment.

Lead full lifecycle delivery of cloud-based web features: design, build, test, release, and operate reliable, scalable systems. Own technical direction, convert ambiguous problems into plans, reduce technical debt, and use observability and metrics to ensure performance and health.

Lead design and implementation of search relevance and vector search features in Elasticsearch. Improve Lucene integration, invent or implement algorithms/data structures, fix complex bugs, write idiomatic modern Java, collaborate with a distributed engineering team, engage with open-source community and triage pull requests.

The Lead Software Engineer will oversee development in abuse and fraud prevention, lead teams, design systems, and ensure high-quality outcomes.

The Staff Software Engineer will design and manage end-to-end data pipelines, ensuring data quality and governance while collaborating across Java and Python systems, including event schema design and AI tooling.

Build and launch backend features and services using Python/Flask and other technologies, own projects end-to-end, identify high-impact improvements, collaborate with product and design, ensure quality, testing, monitoring, and production reliability for services at scale.

Lead and execute manual and automated testing for web, API, desktop, and mobile products. Build and maintain automated test suites, create test plans and cases, document and track defects, collaborate with Agile teams, improve testing processes and frameworks, and mentor junior QA engineers.

Lead the design and implementation of scalable, distributed systems, focusing on Reporting and Insights applications for clients. Guide software initiatives, mentor team members, and drive engineering best practices.