Backend Developer Jobs in Northern Ireland, United Kingdom

Proofpoint is a global cybersecurity leader protecting people, data, and AI agents across email, cloud, and collaboration tools. The Backend Engineer Intern will join the Tessian team to build intelligent security for email, using machine learning to predict and eliminate advanced threats.

Affinidi Elements Platform team builds secure, high‑performance backend services using Rust to enable decentralized identity solutions. The Senior Backend Engineer designs and implements production‑grade systems, optimizes performance, and mentors peers while collaborating with product, security, and infrastructure teams.

Backend Engineer – Wallets at Tether Finance, the team driving the world’s most trusted stablecoin and cutting‑edge digital asset services. Build scalable, secure microservices in Node.js that power instant cross‑chain token transfers and wallet infrastructure.

Yahoo Mail seeks a Backend Engineer II to build scalable, high‑performance systems that power AI/ML personalization across its global email platform. The role focuses on designing robust architectures, optimizing performance, and collaborating with cross‑functional teams in the US. Candidates will develop stateful and stateless services, leverage cloud technologies (especially GCP), and apply advanced data structures and algorithms to handle billions of messages daily.

Backend Engineer/API role at Stripe focuses on developing payment and risk management systems. Responsibilities include designing and maintaining APIs, solving production issues, mentoring engineers, and collaborating with cross-functional teams.

Backend Engineer

Backend Engineering team builds and scales backend systems that power advanced AI-driven capabilities for enterprise applications. The Backend Engineer - Extensions designs reliable, high-performance distributed workflows, collaborates with data scientists to translate AI use cases into scalable services, and ensures observability and resilience in production.

Prograd is an innovative fintech focused on empowering the next generation with better financial knowledge and opportunities. As a Backend Engineer (Node.js) you will design and build scalable high‑performance services, develop GraphQL and REST APIs, manage PostgreSQL databases, and deploy cloud infrastructure on AWS while collaborating with technical leaders and cross‑functional teams.

Backend Engineer at Jobgether, building a high‑scale, real‑time digital platform serving millions of active users. Designs and implements robust backend microservices, optimizes performance, and ensures system reliability in a cloud‑native, containerized environment.

Backend Developer (Java) at Capco in Glasgow. Join a hybrid engineering team focused on financial services and energy.

Backend Engineering team builds scalable backend services for high‑performance digital products. The Senior Backend Developer designs, develops and optimizes PHP and Golang microservices, improves database and caching layers, and leads code reviews in a fully remote environment.

Backend Engineering Team at jobgether builds high-impact backend systems powering internal operations and client-facing products. The role designs, develops, and maintains robust Ruby on Rails services, integrates distributed technologies like Kafka and GraphQL, and collaborates with infrastructure engineers to ensure seamless cloud-native deployments.

AI Backend Engineering team builds MCP-based services and AI-powered backend systems that enable internal teams to automate workflows. The engineer designs, develops, and maintains scalable TypeScript/Node.js services, serverless edge solutions on Cloudflare, and integrates LLM APIs and prompt engineering into production pipelines.

Backend Engineering Team at Nagarro builds scalable backend services and APIs for digital product solutions. The Senior Backend Engineer designs and implements microservices, event‑driven architectures, and containerized applications using Java, Python, FastAPI, Docker and Kubernetes, while ensuring security, performance and reliability.

Backend Engineering team at Nagarro builds scalable, high‑performance services for global clients. The role designs and implements Python‑based microservices and RESTful APIs using FastAPI, containerizes applications with Docker/Kubernetes, and ensures reliability through testing, monitoring, and security best practices.

Engineering team at Verve builds the core ad exchange platform, delivering high‑throughput, low‑latency advertising services. The Senior Backend Engineer leads design and implementation of critical backend components, writes highly concurrent Go or Java code, mentors junior engineers, and ensures operational excellence through performance tuning and incident resolution.

eBay Application Platform – Frameworks Team builds the API foundation that powers millions of buyers and sellers worldwide. As a Senior Backend Engineer you will design, implement, and scale the GraphQL Federation platform, creating high‑performance supergraphs, tooling, and gateways that enable internal teams to deliver reliable, developer‑friendly APIs.

Grand is building the first purpose-built fintech for the B2B economy, creating an intelligent payment network that powers credit and transactions. As a Founding Backend Engineer you will design and build Java services, model data, create event‑driven pipelines, and integrate AI capabilities to turn raw signals into product surfaces, operating the production systems with a security‑first mindset.

Heidi Health builds an AI Care Partner that supports clinicians across documentation to care delivery. As a Senior Backend Engineer you will design, build and maintain high‑performance Python backend systems, manage cloud infrastructure, data storage and message queues, and collaborate with frontend and AI teams to integrate features.

Senior Backend Engineer at Gong.io, part of the Engineering team building the Gong Revenue AI Operating System. The role focuses on designing and scaling high‑performance Java microservices that power AI‑driven revenue insights.