{"id":65118,"date":"2026-05-04T14:50:32","date_gmt":"2026-05-04T14:50:32","guid":{"rendered":"https:\/\/www.elixirr.com\/en-gb\/job-openings\/senior-back-end-engineer\/"},"modified":"2026-05-04T14:50:32","modified_gmt":"2026-05-04T14:50:32","slug":"senior-back-end-engineer","status":"publish","type":"vacancies","link":"https:\/\/www.elixirr.com\/en-gb\/job-openings\/senior-back-end-engineer\/","title":{"rendered":"Senior Back End Engineer"},"content":{"rendered":"
\n

Elixirr Digital<\/strong> is transforming how consulting services are delivered. This role is critical to designing and implementing the backend infrastructure that powers our AI-driven solutions and internal agent platform. As a Senior Backend Engineer, you will leverage modern cloud services (AWS and Azure), open-source frameworks and the latest AI developer tooling to build a scalable, secure and opinionated platform for Elixirr\u2019s next generation of tech-enabled consulting. <\/p>\n<\/div>\n

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This is an engineering role for someone who wants to move fast in a modern AI-assisted software development lifecycle. You will not just use AI tools \u2014 you will help define how Elixirr\u2019s engineering org adopts them responsibly: the harnesses, specs, evals, review practices and guardrails that turn AI-generated code into production-grade software. <\/p>\n

At Elixirr Digital<\/strong>, you\u2019ll have the opportunity to work with advanced tools, grow alongside a team of talented professionals, and make a lasting impact in diverse industries.<\/p>\n

Candidates applying for employment contract kindly note this position is a hybrid working opportunity from our locations in Rijeka<\/strong> <\/span>or Zagreb<\/strong>.<\/span><\/p>\n

What you will be doing as a Senior <\/strong>Back End Engineer<\/strong> at Elixirr Digital?<\/strong> <\/span><\/p>\n

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Platform Architecture & Development <\/strong><\/p>\n

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  • \n

    Design, implement and maintain the core backend architecture for Elixirr\u2019s AI-augmented consulting platform and agent platform. <\/p>\n<\/li>\n

  • \n

    Drive decisions on microservices, containerization and serverless solutions (e.g., AWS Lambda, Azure Functions, ECS, AKS) based on performance, cost and scalability requirements. <\/p>\n<\/li>\n

  • \n

    Own services end-to-end: architecture, implementation, testing, deployment, observability and on-call. <\/p>\n<\/li>\n<\/ul>\n

    AI-Assisted Software Development Lifecycle<\/strong> <\/p>\n

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    • \n

      Operate fluently across a modern, layered AI developer stack: editor-level copilots, agentic coding tools, repo-aware assistants, AI in CI (test generation, security and performance checks) and AI-assisted product discovery. <\/p>\n<\/li>\n

    • \n

      Practice spec-driven, harness-based development: write precise specifications, acceptance criteria and context briefs that let AI tools generate useful code instead of guessing. <\/p>\n<\/li>\n

    • \n

      Treat prompts, agents and evals as first-class engineering artifacts \u2014 versioned, reviewed and tested like any other code. <\/p>\n<\/li>\n

    • \n

      Hold the quality bar high on AI-generated code: review rigorously for correctness, security, edge cases, performance and long-term maintainability. Volume comes from AI; quality comes from engineers. <\/p>\n<\/li>\n

    • \n

      Build and maintain the internal guardrails \u2014 eval harnesses, security checks, policy controls \u2014 that make AI-assisted development safe and repeatable for the rest of the team. <\/p>\n<\/li>\n

    • \n

      Help the team measure impact with clear engineering metrics (deployment frequency, cycle time, change failure rate, defect density) so we know where AI is actually helping. <\/p>\n<\/li>\n<\/ul>\n

      Open-Source & Cloud Integration <\/strong><\/p>\n<\/div>\n

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      • \n

        Evaluate and integrate open-source frameworks to reduce build time and improve reliability (e.g., FastAPI, Django, Spring Boot, Node.js frameworks). <\/p>\n<\/li>\n

      • \n

        Leverage AWS and Azure services (e.g., EC2, S3, RDS, Cosmos DB, Event Hub, SQS, EventBridge) to deliver high-availability, high-performance solutions. <\/p>\n<\/li>\n

      • \n

        Integrate with the agent platform: LLM providers, vector stores, orchestration frameworks (LangGraph, Semantic Kernel, AutoGen) and retrieval pipelines. <\/p>\n<\/li>\n<\/ul>\n

        Security & Compliance <\/strong><\/p>\n

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        • \n

          Implement robust security measures \u2014 OAuth 2.0, OIDC, JWT, fine-grained authorization, secrets management, data protection \u2014 by default, not as an afterthought. <\/p>\n<\/li>\n

        • \n

          Address the specific risks of AI-assisted development: prompt injection, insecure AI-generated code, hallucinated dependencies, and supply chain risks from AI developer tooling. <\/p>\n<\/li>\n

        • \n

          Ensure compliance with relevant industry regulations and Elixirr\u2019s internal data governance standards (e.g., SOC 2, ISO 27001, GDPR). <\/p>\n<\/li>\n<\/ul>\n

          Cross-Functional Collaboration <\/strong><\/p>\n

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          • \n

            Work closely with product, DevOps, front-end, AI engineers, data scientists and client-facing consultants to turn ambiguous problems into shipped product. <\/p>\n<\/li>\n

          • \n

            Communicate architectural decisions and technical trade-offs clearly to both technical and non-technical stakeholders. <\/p>\n<\/li>\n<\/ul>\n

            Performance, Reliability & Observability <\/strong><\/p>\n

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            • \n

              Set up and maintain logging, tracing, metrics and alerting \u2014 including LLM-specific observability (prompts, tool calls, tokens, cost, latency) \u2014 so the platform is understandable and debuggable in production. <\/p>\n<\/li>\n

            • \n

              Diagnose and resolve bottlenecks, and make the platform scale as client and internal usage grows. <\/p>\n<\/li>\n<\/ul>\n

              Mentorship & Thought Leadership <\/strong><\/p>\n

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              • \n

                Mentor engineers across our UK, Croatia and South Africa teams \u2014 especially on how to work effectively alongside AI tooling. <\/p>\n<\/li>\n

              • \n

                Advocate for best practices in cloud-native development, CI\/CD and AI-enhanced workflows. <\/p>\n<\/li>\n<\/ul>\n

                Competencies and skillset we expect you to have to successfully perform your job: <\/strong> <\/p>\n

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                Education & Experience <\/strong><\/p>\n

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                • \n

                  Bachelor\u2019s or Master\u2019s in Computer Science, Engineering or a related field \u2014 or equivalent professional experience. <\/p>\n<\/li>\n

                • \n

                  5+ years building and operating large-scale backend systems in cloud environments (AWS and\/or Azure). <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                  Technical Expertise <\/strong><\/p>\n

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                  • \n

                    Strong proficiency in Python and\/or at least one major backend language\/framework (e.g., FastAPI, Django, Java\/Spring Boot, Node.js). <\/p>\n<\/li>\n

                  • \n

                    Experience with microservices, RESTful API design, event-driven and serverless architectures. <\/p>\n<\/li>\n

                  • \n

                    Familiarity with containerization (Docker, Kubernetes) and Infrastructure as Code (Terraform, CloudFormation, ARM\/Bicep). <\/p>\n<\/li>\n

                  • \n

                    Solid understanding of relational and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB, DynamoDB, Cosmos DB). <\/p>\n<\/li>\n<\/ul>\n

                    AI-Augmented Engineering <\/strong><\/p>\n

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                    • \n

                      Demonstrable daily use of AI-assisted developer tools (coding agents, Copilot-style assistants, AI code review, AI-driven test generation) with a clear view on where they help and where they don\u2019t. <\/p>\n<\/li>\n

                    • \n

                      Experience writing and reviewing AI-generated code with the same (or higher) rigor as human-written code. <\/p>\n<\/li>\n

                    • \n

                      Comfort integrating LLMs, machine learning models, agent frameworks and evaluation tooling into backend services. <\/p>\n<\/li>\n<\/ul>\n

                      Cloud & DevOps <\/strong><\/p>\n

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                      • \n

                        Hands-on with CI\/CD pipelines (GitHub Actions, GitLab CI, Azure DevOps) and modern practices for automated testing, code quality and safe deployment. <\/p>\n<\/li>\n

                      • \n

                        Familiarity with DORA metrics and engineering analytics to measure the impact of changes in process and tooling. <\/p>\n<\/li>\n<\/ul>\n

                        Soft Skills<\/strong> <\/p>\n

                          \n
                        • \n

                          Excellent communication and problem-solving; a track record of delivering complex projects on time. <\/p>\n<\/li>\n

                        • \n

                          Self-driven and proactive \u2014 you pick up new tools, form a view, and bring the team with you.<\/p>\n<\/li>\n<\/ul>\n

                          \n

                          Preferred Qualifications <\/strong><\/p>\n<\/div>\n

                          \n
                            \n
                          • \n

                            Multi-cloud experience: hands-on with both AWS and Azure in production. <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                              \n
                            • \n

                              Familiarity with enterprise security and compliance standards (SOC 2, ISO 27001, GDPR). <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                \n
                              • \n

                                Previous exposure to consulting or professional services environments. <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                  \n
                                • \n

                                  Experience working in distributed teams across multiple time zones.<\/p>\n<\/li>\n<\/ul>\n

                                  \n

                                  Why is Elixirr Digital the right next step for you? <\/strong><\/p>\n<\/div>\n

                                  \n

                                  From working with cutting-edge technologies to solving complex challenges for global clients, we make sure your work matters. And while you\u2019re building great things, we\u2019re here to support you. <\/p>\n<\/div>\n

                                  \n

                                  Compensation & Equity: <\/strong><\/p>\n<\/div>\n

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                                    \n
                                  • \n

                                    Individually tailored benefits package <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                      \n
                                    • \n

                                      Performance bonus <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                        Employee Stock Options Grant <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                        • \n

                                          Employee Share Purchase Plan (ESPP) <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                            \n
                                          • \n

                                            Competitive compensation <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

                                            \n

                                            Flexibility & Balance: <\/strong><\/p>\n<\/div>\n

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                                              \n
                                            • \n

                                              Flexible working hours and remote work <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                                \n
                                              • \n

                                                Multi-sport card <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                                  \n
                                                • \n

                                                  Full medical checkup <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

                                                  \n

                                                  Projects & Tools: <\/strong><\/p>\n<\/div>\n

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                                                    \n
                                                  • \n

                                                    Big clients and interesting projects <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                                      \n
                                                    • \n

                                                      Cutting-edge technologies 
                                                       <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

                                                      \n

                                                      Learning & Growth: <\/strong><\/p>\n<\/div>\n

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                                                      • \n

                                                        Learning and development budget <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                                          \n
                                                        • \n

                                                          Growth and development opportunities 
                                                           <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

                                                          \n

                                                          People-Centered Perks: <\/strong><\/p>\n<\/div>\n

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                                                            Referral bonus <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

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                                                              Anniversary bonus <\/p>\n<\/li>\n<\/ul>\n<\/div>\n

                                                              \n

                                                              We don\u2019t just offer a job – we create space for you to grow, thrive, and be recognized. <\/p>\n<\/div>\n

                                                              \n

                                                               <\/p>\n<\/div>\n

                                                              \n

                                                              Intrigued?\u202fApply now! <\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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