Senior Backend / Platform Engineer (AI Infrastructure)

Gramian Consulting Group; Poland; On-site; PLN 180,000 - 300,000; Full time

Job summary

Gramian Consultancy is seeking a Senior Backend / Platform Engineer to build scalable backend services and platform components powering production AI applications. The role emphasizes microservices, APIs, cloud integration, authentication, performance optimization, and secure platform engineering across AWS and Azure.

You will design and implement RESTful and GraphQL APIs, integrate databases and third-party services, and collaborate with AI engineers to deploy models in containerized

Qualifications

• 5–10 years of backend, platform, or software engineering experience.
• Hands-on Python and/or Node.js development.
• Experience building scalable, cloud-based apps.
• Skilled in RESTful or GraphQL API design.
• Experience with authentication, authorization, and RBAC.

Responsibilities

• Design and build scalable, secure microservices and backend APIs.
• Develop RESTful and GraphQL services for production-grade apps.
• Integrate databases, third-party services, and AI systems.
• Optimize latency, throughput, and resources for real-time workloads.
• Implement enterprise authentication, authorization, RBAC, and rate limiting.
• Build secure service-to-service integrations across clouds.
• Maintain coding standards and engineering quality.
• Write integration tests and participate in code reviews.
• Collaborate with AI engineers to deploy models in containerized environments.
• Apply Git, CI/CD, testing, and cloud engineering best practices.

Skills

Python

Node.js

REST APIs

GraphQL

RBAC / Auth

Cloud platforms (AWS/Azure)

Git / CI/CD

English

Job description

About Gramian

Gramian Consultancy is a boutique consultancy specializing in IT professional services and engineering talent solutions. With a strong background in software engineering and leadership, we help companies build high-performing teams by matching them with professionals who truly fit their needs.

About the Role

Our client is a Big4 Consultancy group that works with leading financial institutions on AI-driven transformation, automation, advanced analytics, and financial crime prevention. Their work spans intelligent fraud detection, AML/KYC modernization, autonomous workflows, enterprise AI platforms, and the secure industrialization of AI in highly regulated environments.

We are looking for a Senior Backend / Platform Engineer to build scalable backend services and core platform components supporting production AI applications. The role focuses on microservices, APIs, cloud integration, authentication, performance optimization, and secure platform engineering across AWS and Azure environments.

CONTRACT: Contractor assignment, expected October 2026 – July 2027, with extensions to other projects

COMMITMENT: Full-time

LOCATIONS: Europe-based, EU-authorized

PROCESS: Initial qualification followed by technical and client interviews

NOTES: Fluent English is required.

Responsibilities

• Design and build highly scalable, resilient, and secure microservices and backend APIs.
• Develop RESTful and GraphQL services for production-grade applications.
• Integrate business databases, third-party services, and legacy internal platforms with AI systems.
• Optimize backend latency, throughput, and resource allocation for real-time AI workloads.
• Implement enterprise-grade authentication, authorization, RBAC, and rate limiting.
• Build secure service-to-service integrations across cloud environments.
• Establish clean coding standards and maintain strong engineering quality.
• Write comprehensive integration tests and participate in code reviews.
• Collaborate with AI engineers to deploy models and services in unified containerized environments.
• Apply Git, CI/CD, testing, and cloud engineering best practices throughout delivery.

Requirements

• 5–10 years of professional backend, platform, or software engineering experience.
• Strong hands-on development experience with Python and/or Node.js.
• Proven experience building scalable, resilient, and secure cloud-based applications.
• Strong experience designing RESTful or GraphQL APIs and microservices.
• Hands-on experience with enterprise authentication, authorization, and RBAC.
• Professional experience integrating applications with cloud-hosted services, APIs, and data platforms.
• Strong development practices including Git, CI/CD, automated testing, and code review.
• Fluent professional English.