Top Backend Jobs in Bristol

Build secure, reliable, and performant backend features for GitLab repository management using Ruby and GraphQL. Develop APIs, data models, business logic, tests, and policy-based functionality while improving performance, observability, caching, and resiliency. Collaborate asynchronously across product and engineering teams, participate in Tier 2 on-call, troubleshoot incidents, review AI-generated code, and contribute to branch protection, Codeowners, merge strategies, and AI-powered repository configuration.

Lead the technical direction and architecture of the Foundations platform team, owning authentication, authorization, SSO, secrets management, tenancy, and core platform services. Design APIs, drive services through launch, make technical decisions, establish engineering standards, and mentor engineers without formal management authority. Partner with engineering and product leaders to align execution with priorities.

Senior backend engineer responsible for designing, coding, and operating highly available distributed identity systems for Affirm’s international markets. The role includes owning quarterly goals, delivering scalable features in Kotlin and Python, collaborating across product and engineering teams, improving code and design standards, monitoring system availability, resolving production issues, mentoring engineers, and supporting technical planning and hiring.

Build backend data frameworks and tooling that keep GitLab’s datastores scalable, healthy, and safe across SaaS and self-managed deployments. Develop retention and lifecycle controls, schema-change guardrails, bulk data removal tools, SQL traffic replay, and background operations frameworks. Collaborate across engineering and product teams, review database changes, improve performance and migration safety, document best practices, and participate in a tier 2 database on-call rotation.

Design, build, and maintain secure, tested, performant backend integrations connecting GitLab agents with tools such as Slack, Claude Code, and Codex. Own complex features, develop GraphQL and REST APIs, improve automated testing, troubleshoot production issues through on-call rotations, enhance observability and resiliency, and collaborate across product, frontend, backend, and AI engineering teams.

Build, deploy, and maintain backend solutions for websites, digital products, APIs, and integrations using primarily Python, Django, and Wagtail. Improve security, performance, reliability, and testing; troubleshoot live services; participate in code reviews and on-call support; collaborate with engineers, designers, client success teams, and clients; and contribute to technical planning, documentation, and delivery.

Set long-term technical strategy for backend identity systems, lead major distributed-system initiatives, ensure operational availability, establish engineering quality standards, collaborate cross-functionally, and mentor engineers. Build and launch highly available systems supporting international expansion, KYC verification, identity data management, decisioning, regulatory compliance, and global risk models.

Build and operate high-traffic backend services for Universal Wallet, supporting fiat and stablecoin deposits, withdrawals, balances, integrations, and settlement. Develop across Python and Kotlin/Java stacks, design APIs and event-driven systems, improve architecture and observability, review code, and participate in on-call production support. Collaborate asynchronously across teams, influence technical decisions, and deliver reliable financial infrastructure.

Build and operate high-performance backend systems and distributed services using Elixir and Phoenix. Design declarative infrastructure with Terraform, Terramate, FluxCD, Kubernetes, and Helm; manage AWS cloud workloads, cluster upgrades, GitOps workflows, observability, and databases. Collaborate with a remote engineering team on architecture, product development, debugging, reliability, and customer success.

Develop and implement security controls across backend systems, investigate incidents and anomalies, triage bug bounty submissions, conduct threat hunting, improve remediation processes, maintain security policies, and support access governance. The role requires hands-on coding, strong PHP knowledge, security awareness, clear communication with nontechnical teams, and ownership across a broad technology stack.

Build and scale event-driven microservices for M-KOPA Mobility using C#/.NET. Own solutions throughout their lifecycle, from architecture and development through deployment, observability, monitoring, and decommissioning. Work with Azure, messaging systems, Kubernetes, Docker, automated testing, infrastructure as code, and DevOps practices while collaborating with distributed teams and coaching other engineers.

Leads backend architecture and streaming services for high-volume maritime tracking and trade data. Builds Python and PHP microservices, Kafka pipelines, and PostgreSQL and ClickHouse data systems. Owns production reliability, observability, CI/CD, and containerized deployments while collaborating with product, platform, and client-facing teams. Mentors engineers, drives modernization, and establishes technical standards.

Lead cross-functional Developer Experience initiatives across six teams, contributing hands-on backend code in Ruby and Go. Improve testing reliability, test coverage, CI/CD pipelines, logging standards, and development environments. Partner with engineering, platform, product, and infrastructure teams to identify friction, remove systemic bottlenecks, shape the Developer Experience Platform strategy, and foster continuous engineering improvement.

Build and secure backend systems that execute untrusted user code at scale. Responsibilities include designing sandboxed runtimes, threat detection, incident response, vulnerability management, penetration testing, security reviews, vulnerability disclosure, SOC 2 maintenance, and promoting security practices across engineering. The role requires backend engineering, offensive-security curiosity, runtime isolation experience, on-call participation, and collaboration with an open-source developer tools community.

Develop realistic backend coding challenges, feature implementations, bug fixes, and deterministic verification systems for AI training projects. Responsibilities include designing scalable backend scenarios, evaluating code correctness and quality, incorporating automated testing, identifying edge cases and performance issues, applying secure coding principles, and refining validation logic. The role requires strong backend programming experience, debugging and optimization skills, knowledge of algorithms and data structures, and independent technical problem-solving.

Build and operate core components of a distributed, multi-tenant database and SaaS data platform, including ingestion, query planning, distributed execution, storage formats, APIs, tenant isolation, quotas, audit logs, and background jobs. Develop agent-facing retrieval interfaces, instrument services with observability tooling, and shape architecture as the product evolves from prototype to production. Collaborate across product and infrastructure while making pragmatic decisions in an autonomous environment.

Own technical direction and execution for major products and systems. Design scalable backend, frontend, API, database, and infrastructure solutions; write code; prototype; review code; debug production issues; make architecture trade-offs; convert ambiguous problems into execution plans; improve engineering quality; lead critical initiatives; and mentor engineers.

Build and own backend services, APIs, workflows, and financial infrastructure for an AI neobank. Responsibilities include supporting onboarding, payments, accounts, cards, transfers, rewards, travel, FX, KYC, and risk flows; integrating with financial partners and third-party platforms; and ensuring reliability, security, scalability, observability, and data integrity. The role collaborates with product, frontend, mobile, and AI teams to deliver production systems for millions of users.

Develop and maintain Tailscale’s control plane, relay infrastructure, identity integrations, open-source client code, and backend services. Design, test, document, and operate scalable software, emphasizing observability, security, incident response, customer escalations, and system stability. Collaborate asynchronously with engineers, product managers, and designers while contributing to product strategy and the full product lifecycle.

Leads technical direction and hands-on execution for major products and systems. Designs scalable backend, frontend, API, database, and infrastructure solutions; writes code; drives architecture decisions; solves production issues; improves engineering quality, reliability, security, testing, and observability; and mentors engineers across teams.

Own technical direction and execution for major products and systems. Design scalable and reliable architectures, write production code, lead architecture decisions, solve complex engineering problems, and drive initiatives from concept through production. Improve engineering quality across testing, security, observability, and development practices while mentoring engineers and coordinating work across teams and products.

As a Senior Backend Engineer at DuckDuckGo, you'll lead backend projects, mentor engineers, and develop AI-enhanced features for the company's privacy-centric product line.

Design, develop, test, and maintain scalable backend applications, services, and APIs using modern engineering practices. Responsibilities include architecture and solution design, unit and integration testing, troubleshooting, code reviews, technical discussions, Agile collaboration, continuous improvement, and mentoring junior engineers. The role emphasizes performance, reliability, scalability, security, maintainability, and translating business requirements into high-quality technical solutions.

Develop backend blockchain functionality for Cardax DEX on the Cardano blockchain. Write and maintain smart contracts in Plutarch and Haskell that define the constraints and conditions for decentralized token exchange without a central entity.

Build and operate backend services for an AI-native context management system, including ingestion, indexing, retrieval APIs, multi-tenant SaaS infrastructure, agent integrations, and administration tools. Define architecture, storage, service boundaries, and API contracts while instrumenting systems for reliability. Work autonomously in an early-stage environment, iterate rapidly, collaborate across teams, and deliver scalable production software for AI-agent workflows.