Top Software Engineer Jobs in Belfast

Provides hands-on technical leadership for platform engineering teams. Designs and operates secure, scalable APIs, authentication and authorization services, onboarding systems, configuration management, and shared cloud-native capabilities. Leads architecture decisions, improves engineering quality, reliability, observability, testing, security, and delivery practices. Partners with product, engineering, SRE, and developer experience teams while mentoring engineers and setting technical standards across the organization.

Build and operate platform-level portal software across frontend and backend systems. Responsibilities include developing APIs and reusable React libraries, managing AWS and Kubernetes infrastructure, improving performance, accessibility, security, and observability, and driving CI/CD automation. The role also involves technical leadership, architecture decisions, cross-functional collaboration, mentoring junior engineers, and balancing technical debt with feature delivery.

Lead design and delivery of scalable, cloud-native backend systems and integrations. Provide technical leadership, conduct code reviews, champion testing and observability, mentor engineers, collaborate with stakeholders, and drive operational excellence.

Design, develop, test, and maintain scalable backend applications and integrations. Replace a critical legacy system with a modern technology stack, troubleshoot technical issues, improve system resilience, support releases and deployments, and maintain documentation. Implement automated testing, continuous integration, and code reviews while guiding colleagues and applying systems thinking to solve complex problems.

Design and develop scalable backend systems using Python and cloud platforms for high-volume email processing. The role involves distributed systems, Kafka and data infrastructure, sensitive data security, system maintenance, cross-functional collaboration, technical leadership, mentoring, and leading projects through production deployment.

Design, build, and operate high-performance backend services and distributed systems for a large-scale Threat Response SaaS platform. Responsibilities include developing scalable processing frameworks, supporting parallel execution and tenant isolation, optimizing PostgreSQL databases, improving system throughput, and maintaining production systems. The role also involves collaborating across teams and leveraging AI-assisted engineering tools for software development, testing, debugging, and operational support.

Build and operate secure, scalable cloud integration services and distributed data-processing systems. Own capabilities across design, implementation, testing, deployment, observability, production support, and continuous improvement. Lead technical decisions, improve CI/CD and infrastructure automation, define service-level objectives, participate in incident response, and mentor engineers. The role requires hands-on software engineering, cloud-native platforms, containers, databases, secure software delivery, and cross-functional collaboration.

Designs, builds, and operates scalable, secure cloud platforms for a global multi-tenant SaaS environment. Responsibilities include AWS networking and architecture, Kubernetes platforms, CI/CD, observability, reliability engineering, disaster recovery, and database operations. The role also contributes to automation, infrastructure scalability, regional failover, and secure production operations using Java or Python, Terraform, and relational databases.

Build and operate secure, scalable, highly available cloud services and distributed data-processing systems. Own capabilities through design, implementation, testing, deployment, observability, production support, and continuous improvement. Drive technical decisions, improve CI/CD and infrastructure automation, define service-level objectives, participate in incident response, and mentor engineers. Collaborate across engineering, product, security, infrastructure, and operations teams while balancing reliability, performance, security, cost, and maintainability.

Designs and develops distributed systems and high-performance backend services for Proofpoint’s Threat Response product. Responsibilities include building scalable, multi-tenant SaaS platforms; processing high volumes of events and transactions; optimizing databases and system performance; supporting parallel execution and tenant isolation; and leveraging AI-assisted engineering tools for development, testing, debugging, and operations.

Design, develop, test, and implement Python applications, ETL pipelines, and real-time processing components for an enterprise reference data platform. Architect and optimize Oracle databases, SQL queries, and PL/SQL code while improving performance, scalability, and reliability. Collaborate with data stakeholders, support CI/CD and automated testing, troubleshoot production issues, and ensure governance compliance. Mentor junior developers and participate in Agile delivery.

Lead development of scalable, low-latency Maps API services and distributed ETL pipelines. Design systems, make architectural decisions, build and deploy microservices, monitor and troubleshoot production systems, and support continuous delivery. Mentor engineers through reviews and guidance, reduce technical debt, improve performance, document systems, and participate in on-call support. The role requires strong backend engineering experience, AWS expertise, mapping or geospatial product experience, and proficiency in Python and NodeJS.

Develop and maintain Elasticsearch’s Inference API and plugin framework, integrating internal and external AI providers. Responsibilities include API and protocol design, streaming, asynchronous execution, rate limiting, configuration, billing integration, error handling, open-source contribution reviews, incident response, and comprehensive unit, REST, and rolling-upgrade testing. The role requires advanced Java expertise, concurrency and parallelism knowledge, API design skills, cross-functional collaboration, and autonomous work in a distributed team.

Designs, develops, and operates large-scale software-defined networking for NVIDIA AI Cloud environments. Responsibilities include building OVS/OVN control and data plane software, Kubernetes networking services, observability systems, CI/CD pipelines, GitOps infrastructure, and production reliability tooling. The role requires expertise in C, Go, distributed systems, cloud networking, Kubernetes CNIs, infrastructure automation, secure service development, and datacenter networking.

Build and scale iVerify’s full-stack mobile security platform. Responsibilities include developing React admin interfaces, designing Python and Kotlin backend APIs and data models, supporting device management and telemetry dashboards, optimizing performance, writing secure scalable code, and contributing to architectural standards. The role collaborates with designers, mobile engineers, and backend developers in an Agile environment.

Graduate software engineers will develop open-source and commercial software across the Linux stack, from firmware, kernels, and drivers to desktop applications, containers, clouds, and Kubernetes. Responsibilities include writing resilient, performant code, contributing to product roadmaps, engaging with users and open-source communities, addressing customer issues, and developing secure software. The role is globally remote with twice-yearly international team sprints and emphasizes mentorship, collaboration, and continuous technical growth.

Work on the Core team building and maintaining APIs and services for baskets, orders, checkout, promotions, and capacity. Implement small-to-medium features, write tests, participate in code reviews and on-call rotations, collaborate with stakeholders, and use version control and AI coding tools to improve reliability and scalability.

Build end-to-end software solutions and integrations for strategic customers. Partner closely with customer engineers and executives, design technical architectures and product features, apply ElevenLabs technologies, and solve complex problems through hands-on coding and implementation. The role requires strong Python and software development expertise, API integration knowledge, clear communication, and regular travel to customer sites.

Build and maintain customer-facing features, internal tools, and platform improvements for a Rails-based self-storage operating system. Responsibilities include full feature ownership, collaborating with Product, writing tests, debugging production issues, improving stability and performance, monitoring applications, participating in code reviews, and contributing to technical discussions. The role requires independent work on defined tasks and collaboration within a small product engineering team.

Build and maintain BrandX software, including dashboard features, billing systems, authentication, and AI Assist capabilities. Own small-to-medium features, write and review code, create tests, support CI/CD and deployments, troubleshoot production issues, participate in team ceremonies, and join the on-call rotation. Collaborate with distributed teams while using AI coding tools such as Claude Code and GitHub Copilot.

Build and own automated testing frameworks, CI/CD infrastructure, load and stress testing, and chaos engineering practices for a brokerage platform. Write primarily Go, integrate AI and LLM tooling into quality workflows, investigate application and Kubernetes failures, improve developer tooling, and mentor engineers on reliability and test coverage.

Build and operate production custody systems: signing service, key management, chain integrations, and transaction pipelines. Own end-to-end subsystems, integrate new chains, collaborate with cryptography on threshold signing and key recovery, write post-mortems, and produce clear async design docs and PRs.

The Senior Software Engineer will design and implement systems for AI integration, build scalable backend services, and mentor team members, ensuring high-quality systems that meet user needs.

Implement and ship Storage Encryption Everywhere in Firefox/Gecko, including schema migrations, encrypted data storage, integration and platform testing. Collaborate through code review, resolve specification questions, and shepherd the feature across Nightly, Beta, and Release. Diagnose and fix correctness, performance, and regression issues in a multithreaded browser-engine codebase while contributing openly through public bugs and upstream landing.

Design, build, and operate high-performance platform services for SailPoint’s Identity Security Cloud. Develop Golang microservices, Angular and TypeScript features, automated tests, and AWS-based distributed architectures. Collaborate with data scientists on AI-driven capabilities, optimize low-latency services and databases, improve CI/CD pipelines, participate in a 24x7 on-call rotation, and contribute to technical design, mentoring, and platform strategy.