Senior Backend Developer
Lokation: BallerupWe are looking for a Senior Backend Developer for our client in the Pharma industry Key Responsibilities Backend Development & Modernization Build, maintain, and improve backend services in Python, with a focus on migrating a legacy Flask application to a modern FastAPI architecture using Domain-Driven Design principles Design and implement clean, well-tested domain packages with enforced architectural boundaries, repositories, and service layers Continuously deliver production-ready code while the legacy system re-mains live - ensuring zero regression and zero downtime throughout the transformation Infrastructure, Deployment & Operations Manage and evolve AWS infrastructure using Terraform, covering ECS Fargate, ALB, ECR, S3, 1AM, and SSM Parameter Store Build and maintain CI/CD pipelines in GitHub Actions with OIDC-based cloud authentication and multi-environment promotion (development, test, production) Containerize services using Docker with production-optimized multi-stage builds, and manage deployments with zero-downtime strategies (rolling updates, blue/green) Data Architecture & Integration Design and maintain PostgreSQL schemas, write and optimize complex queries, and manage schema evolution through Alembic migrations on live databases Responsible for data ingestion, integration, and curation from various in-ternal and external sources (SAP, LIMS, Outlook, and others) in a highly-regulated environment Design, build, maintain, and improve end-to-end data pipelines for prod-uct data ingestion, output, and visualization Quality, Testing & Compliance Write and maintain comprehensive test suites using pytest, covering unit, integration, and behavioral tests Develop BDD tests (Given/When/Then) that mapdirectly to user require-ments and serve as evidence of fitness for intended use within a Quality Management System (QMS) Uphold testing discipline as a core engineering practice - tests are not an afterthought but a primary deliverable in a regulated industry context Stakeholder Engagement Engage with the team and internal stakeholders to understand and resolve technical issues and advise on solutions Use agile engineering practices and modern development tools to rapidly develop creative and efficient solutions that deliver value to users and the company Main Job Tasks Backend Development & Modernization Incrementally port legacy Flask endpoints and database layers to FastAPI and SQLAlchemy 2.0, using patterns such as strangler fig, bridge layers, and parallel running Implement new features as domain packages (bounded contexts) with strict import boundaries enforced by tooling (import-linter) Model domain entities using modern SQLAlchemy 2.0 patterns (Mapped[], mapped_columnO, explicit loading strategies) and validate data with Py-dantic v2 Manage Python dependencies, workspaces, and builds using UV (Astral) Infrastructure, Deployment & Operations Author and maintain Terraform configurations for AWS infrastructure, managing state across multiple environments (poc, tst, prd) Configure and maintain GitHub Actions workflows for automated testing, linting, type checking, Docker image builds, and multi-stage deployments with manual approval gates Manage ECS Fargate services, task definitions, auto-scaling policies, and ALB routing rules Write and optimize Dockerfiles for API, migration runner, and supporting services Data Architecture & Integration Design and execute zero-downtime database migrations using Alembic (e.g., multi-step add-column, backfill, then constrain patterns) Optimize PostgreSQL query performance through indexing strategies, query plan analysis, and schema design Build and maintain integration connectors that ingest data from external regulated systems Ensure referential integrity and data quality across a shared database serving multiple bounded contexts Quality, Testing & Compliance Design pytest fixture hierarchies, test isolation strategies (in-memory SQLite for speed, Postgres for fidelity), and test markers for selective execution Write BDD feature specifications that trace directly to user requirements, serving as living documentation and QMS compliance artifacts Maintain and extend pre-commit hooks, linters (Ruff), and type checkers (ty) to enforce code quality standards across the codebase Knowledge, Skills and Experience Experience 10+ years of proven industry experience in backend software development Extensive demonstrated experience building and maintaining production Python systems. Deep fluency with modern Python: type hints, data-classes, protocols, async/await, context managers, decorators, and modern packaging. Must be comfortable navigating, understanding, and improv-ing large legacy codebases while simultaneously building greenfield code to high standards Hands-on experience with SQLAlchemy 2.0 (Mapped[] , mapped_ column (), relationship loading strategies). Ideally has migrated code from SQLAlchemy 1.x to 2.0 patterns Proficient in PostgreSQL: schema design, query optimization (EXPLAIN ANALYZE), indexing strategies, transaction isolation, and managing schema changes on live databases Solid understanding of RDBMS fundamentals: normalization, referential integrity, foreign key constraints, composite keys, and knowing when to denormalize Experience managing database migrations (Alembic) in production, in-cluding zero-downtime patterns Experience with FastAPI or equivalent ASGI frameworks, including de-pendency injection, Pydantic validation, middleware, and building pro-duction REST APis. Experience with Flask is also relevant given the ongoing migration from Flask to FastAPI Demonstrated experience incrementally refactoring and migrating running production applications to modern architectures. Understands patterns like strangler fig, parallel running, and bridge layers Working knowledge of AWS services: ECS Fargate, ECR, ALB, S3, IAM roles, and SSM Parameter Store Experience with Terraform for infrastructure-as-code, including state man-agement, multi-environment configuration, and plan/apply workflows Comfortable with Docker: multi-stage builds, layer caching, production image optimization, and debugging containerized applications Strong testing discipline with pytest, covering unit and integration tests. Experience with fixture design, test isolation strategies, and test mark-ers/parametrization Experience writing BDD tests that map directly to user requirements and serve as evidence of fitness for intended use. Familiarity with Given/When/Then patterns. Important for our regulated industry context where tests serve as QMS compliance artifacts Familiarity with UV (Astral) for Python dependency management, workspaces, and lock files Experience with Domain-Driven Design: identifying bounded contexts, implementing the repository pattern, and enforcing architectural bound-aries between domains Experience with Pydantic v2: model validators, discriminated unions, and pydantic-settings for configuration management Experience with CI/CD using GitHub Actions, including OIDC-based cloud authentication, multi-environment promotion pipelines, and auto-mated deployment workflows Experience (Nice-to-Have) Understanding of Operations Research and Mathematical Optimization: Mixed Integer Programming (MIP), linear constraints, objective functions, and solver behavior. We have a core scheduling optimizer built on Python-MIP (CBC solver) that is part of the codebase Prior work in a regulated industry (pharma, medical devices, or similar) where traceability between requirements and tests, change control, and documentation discipline are expected Personal Skills Good listening and communication skills in English Generalist mindset with a strong focus on business objectives Curious, driven, self-starting and executing Ability and desire to learn and understand the domain and business, and constantly strive to improve this understanding to add value Ability to assume responsibility for architecture, implementation, DevOps, and support - whatever is needed to achieve the objectives Team player with experience working in teams of 5+ people Proactive in establishing strong Software Engineering capability and en-suring knowledge sharing across the team Start date: 1-05-2026 End date: 31-12-2026 Location: Ballerup, Denmark For the duration of this assignment Ework Services (0,9%) will be deducted from the total amount invoiced. We offer candidates continuously. This means that we sometimes remove the assignments before deadline. If you are interested, we recommend that you apply immediately.
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