Junior Backend Developer

🏢 Summary: The offer is for a Python Backend Engineer to build and maintain scalable backend services and REST APIs in a collaborative product environment. The role focuses on developing clean, well-tested code and contributing to architecture and code quality from day one. It is a fully remote position with flexible contract options and long-term international projects. 🗂️ Requirements: 3+ years of professional Python experience, Strong knowledge of FastAPI, Django, or Flask, Experience with PostgreSQL, Experience with REST API design, Proficiency with Git, Experience with pytest, Experience with CI/CD workflows 📃 Skills: Python, FastAPI, Django, Flask, PostgreSQL, REST, Git, pytest, CI/CD, AWS, GCP, Azure, Docker, Kubernetes, Kafka, Redis, RabbitMQ, Poetry, uv 🏢 Description: About the role We're looking for a Python backend engineer to join a client team and build reliable, scalable services from day one. Responsibilities Design and maintain Python-based backend services and REST APIs Write clean, tested, well-documented code Collaborate with product and DevOps teams on feature delivery Participate in code reviews and architecture discussions Requirements 3+ years of professional Python experience Solid knowledge of FastAPI, Django, or Flask Experience with PostgreSQL and RESTful API design Comfortable with Git, pytest, and CI/CD workflows Good written and spoken English Nice to have AWS, GCP, or Azure Docker / Kubernetes Kafka, Redis, or RabbitMQ Poetry or uv for dependency management pre-commit hooks and code quality tooling We offer B2B contract or employment contract (umowa o pracę / umowa zlecenie) — flexible on the form Fully remote, flexible setup Long-term engagements with international clients Dedicated recruiter support through onboarding

🏢 Summary: Full-Stack Software Developer role focused on developing and modernizing a complex platform using Python and React. The position involves backend and frontend ownership, migration to a modern tech stack, and deployment in AWS within an Agile environment. The developer will contribute to architectural decisions and CI/CD processes. 🗂️ Requirements: 5+ years of software development experience, Strong experience with Python, Experience with React, Practical knowledge of PostgreSQL, Experience designing and consuming REST APIs, Experience with AWS, Experience with CI/CD pipelines, Experience with end-to-end testing tools, Experience working in Agile environments (Jira or Confluence) 📃 Skills: Python, React, PostgreSQL, REST, AWS, GitHubActions, Playwright, CICD, Jira, Confluence 🏢 Description: We are currently looking for a Full-Stack Software Developer to join an international team working on the development and modernization of a complex software platform. The role involves taking ownership of both backend and frontend development during an ongoing project transition, including migration of existing functionalities to a modern technology stack. You will collaborate with a distributed Agile team and have real influence on the technical direction of the frontend architecture. Key Responsibilities Design, develop, and maintain full-stack applications using Python and React Develop and maintain RESTful APIs Work with PostgreSQL databases Participate in the migration of existing application components to a modern frontend framework Implement end-to-end testing using tools such as Playwright Manage CI/CD pipelines using GitHub Actions Deploy and maintain applications in AWS Collaborate with engineers in an international Agile environment Contribute to architectural discussions and technical decisions Requirements 5+ years of experience in software development Strong experience with Python Experience with React Practical knowledge of PostgreSQL and REST APIs Experience working with AWS Familiarity with CI/CD pipelines (e.g., GitHub Actions) Experience with end-to-end testing tools (e.g., Playwright) Experience working in Agile environments using tools such as Jira or Confluence Strong communication skills and a proactive mindset Nice to Have Experience with NumPy or SciPy Experience working in distributed engineering teams Experience participating in application migrations or system transitions

🏢 Summary: Contract opportunity for a Fullstack Developer to design and deliver web applications using modern Python and JavaScript frameworks, with a focus on AI-driven solutions. The role involves building and maintaining backend services, developing responsive frontend interfaces, and deploying applications in a cloud environment. Onsite presence is required in the Greater Copenhagen Area with a hybrid setup. 🗂️ Requirements: Strong backend development experience with Python, Experience with FastAPI, SQLAlchemy, Alembic, Proficiency in JavaScript and TypeScript, Experience with React and NextJS, Experience with PostgreSQL, Knowledge of Qdrant or other vector databases, Experience with Azure cloud platform, Experience with Docker containerization, Ability to develop and maintain fullstack web applications, Availability to work onsite minimum 3 days per week 📃 Skills: Python, FastAPI, SQLAlchemy, Alembic, JavaScript, TypeScript, React, NextJS, PostgreSQL, Qdrant, Azure, Docker, LLM, LangChain, LangGraph 🏢 Description: Introduction & Summary We are seeking a highly skilled Fullstack Developer. The ideal candidate will possess extensive experience in backend and frontend development, with proficiency in Python and JavaScript frameworks. If you have a passion for developing innovative solutions and a keen interest in AI technologies. Main Responsibilities As a Fullstack Developer, you will be responsible for designing and implementing web applications and services. Your focus will be on enhancing user experiences through effective software solutions. Develop and maintain backend services using Python with FastAPI. Implement frontend solutions utilizing React / NextJS. Work with PostgreSQL (Relational) and Qdrant (Vector) databases. Utilize Azure and Docker for deploying applications. Collaborate with cross-functional teams to define, design, and ship new features. Ensure code quality and maintainability throughout the development process. Debug and optimize existing applications. Key Requirements Strong experience in backend development using Python (FastAPI, SQLAlchemy, Alembic). Proficient in frontend technologies, specifically Javascript/Typescript with React / NextJS. Experience with relational databases, particularly PostgreSQL. Knowledge of vector databases like Qdrant. Familiarity with cloud platforms such as Azure. Experience with Docker for containerization. Experience with LLM / AI technologies is a plus. Bonus: Familiarity with LangGraph / LangChain for Python. Nice to Have Previous experience with AI-driven applications. Understanding of software design patterns and best practices. Experience in agile development methodologies. Start: ASAP End: End of September 2026 Location: Greater Copenhagen Area Onsite/remote: min. 3 days onsite per week

🏢 Summary: Fullstack Developer role focused on building and maintaining Python-based applications, REST APIs, microservices, and AI-supported data solutions. The position involves working with LLM integrations, CI/CD pipelines, automated testing, and modern engineering practices in a collaborative environment. Candidates should have strong backend expertise with Python and experience across full stack technologies. 🗂️ Requirements: 5+ years of professional software development experience, Advanced Python development experience, Advanced knowledge of Flask or similar Python frameworks, Advanced experience with REST APIs, Practical experience with LLMs, Experience with Docker, Intermediate JavaScript skills, Intermediate PostgreSQL knowledge, SQLAlchemy experience, Familiarity with React, Familiarity with CSS, Familiarity with SCSS, Experience writing automated tests, Experience with pytest, Experience with CI/CD pipelines, Good knowledge of Git, Fluent English communication skills 📃 Skills: Python, Flask, REST, LLM, Docker, JavaScript, PostgreSQL, SQLAlchemy, React, CSS, SCSS, pytest, CI/CD, Git, TypeScript, Redux, Zustand, SharePoint, Artifactory, JFrog, Kubernetes, AWS 🏢 Description: As a recruitment company, DCG understands that every business is powered by experienced professionals. Our management style and partnership approach enable us to meet your needs and provide continuous support. Due to our ongoing growth and the large number of recruitment projects we undertake for our partners, we are currently looking for: Python Fullstack Developer Responsibilities: Designing, developing and maintaining full stack applications with a strong Python backend focus Translating business requirements, epics and user stories into technical solutions Building data integrations and data transformation logic Reading from and writing to various databases and APIs Ensuring data completeness, quality and reconciliation between systems Developing REST APIs and microservices Working with LLM-based solutions and AI-supported data enrichment Creating and maintaining CI/CD pipelines Writing automated tests and ensuring high development standards Collaborating with Product Owners, Solution Architects, Analysts and other stakeholders Supporting the team in applying modern engineering practices and automation Requirements: Minimum 5 years of professional experience in software development Advanced experience in Python development and configuration Advanced knowledge of Flask or similar Python frameworks Advanced experience with REST APIs Practical experience with LLMs at least at an intermediate level Experience with Docker Intermediate JavaScript experience Intermediate knowledge of PostgreSQL and SQLAlchemy Familiarity with React Familiarity with CSS and SCSS Ability to write automated tests, preferably with pytest Experience with CI/CD and creating deployment pipelines Good knowledge of Git Strong engineering mindset and focus on high-quality software delivery Ability to work effectively in a multicultural, collaborative environment Good stakeholder engagement and communication skills Fluency in English (both written and spoken) Nice to have: Experience with AI tooling Familiarity with TypeScript Familiarity with web components Familiarity with Redux or Zustand Experience with SharePoint API Experience with Artifactory / JFrog Experience with Kubernetes Experience with cloud services, especially AWS Offer: Private medical care Co-financing for the sports card Constant support of dedicated consultant Employee referral program

🏢 Summary: The offer is for a Staff Python Developer to design and build scalable backend services, internal core banking tools, and customer-facing banking systems deployed in the cloud. The role focuses on system design, third-party integrations, and improving engineering standards within a remote team. It combines hands-on development with technical leadership and architectural decision-making. 🗂️ Requirements: Strong experience with Python and backend development, Experience with Django framework, Experience designing scalable backend services and APIs, Hands-on experience with AWS, GCP, or Azure, Strong knowledge of PostgreSQL or MySQL, Experience with NoSQL databases, Knowledge of CI/CD and DevOps practices, Experience with logging, monitoring, and tracing tools, Understanding of security best practices and secure coding, Strong system design and architectural skills, Ability to lead technical initiatives and mentor engineers 📃 Skills: Python, Django, PostgreSQL, MySQL, Redis, MongoDB, DynamoDB, AWS, GCP, Azure, CI/CD, DevOps, Logging, Monitoring, Tracing, APIs, NoSQL, Security 🏢 Description: We are looking for a Staff Python Developer to expand our small remotely working team. Join us to develop internal core banking tools and customer-facing services for banking products. Systems developed by the group are used by customers daily and are critical to the company's success. They are based on Django and PostgreSQL and are deployed to AWS. In addition, you will play a central role in the development of new features and integration with third-party systems to improve the workflows of commercial teams worldwide. Responsibilities: Design and implement software solutions and integrations with third-party systems to support business activities Introduce and advocate for coding best practices, ensure well-tested and maintainable code Collaborate with other engineers, product managers and UX designers throughout the development to involve them in the decision making and set expectations Contribute to the documentation to share knowledge and increase the team's expertise Investigate and apply new technologies to make our systems simpler and more efficient Experience designing and building scalable backend services and APIs Hands-on experience with cloud platforms: AWS, GCP, or Azure Strong database expertise: PostgreSQL/MySQL, NoSQL databases (Redis, MongoDB, DynamoDB, etc.) Strong CI/CD and DevOps practices knowledge Experience with observability tooling:Logging, Monitoring, Tracing Understanding of security best practices and secure coding standards 100% commitment to our team - we maintain a single-employment policy Leadership & Staff-Level Expectation: Strong system design and architectural decision-making skills Ability to mentor senior and mid-level engineers Proven ability to lead technical initiatives across multiple teams Strong system design and architectural decision-making skills Ability to mentor senior and mid-level engineers Experience driving engineering standards and best practices Ability to influence technical direction without direct authority Strong ownership mindset and ability to lead ambiguous projects Ability to balance delivery speed with technical quality and scalability What we offer: Competitive salary tailored to your skills and experience Participation in the company stock option program (equity) 20 paid days off annually, starting after a 3-month trial period No corporate nonsense — just real work, focused engineering, and minimal process overhead Flexible work environment with trust-based collaboration Opportunity to work on meaningful, technically challenging projects Direct communication and fast decision-making processes

🏢 Summary: Senior Back-End Developer role focused on designing and building scalable, secure APIs and services for a SaaS legal-tech platform hosted on AWS. The position involves developing distributed systems, optimizing data models, and integrating multiple AWS services to support complex enterprise workflows. You will collaborate with cross-functional teams to improve performance, reliability, and architecture of the back-end systems. 🗂️ Requirements: Experience as Back-End or Full-Stack Developer in SaaS environment, Strong knowledge of Python 3.10+, Strong knowledge of Django 4.x and Django REST Framework, Experience with PostgreSQL, Experience with Redis and/or Elasticsearch/OpenSearch, Experience with Celery and asynchronous task processing, Familiarity with AWS services: ECS, Lambda, S3, RDS, SQS/SNS, Experience with Git and CI/CD pipelines, Experience working in Agile/Scrum environment, Strong debugging and performance optimization skills 📃 Skills: Python, Django, DjangoRESTFramework, PostgreSQL, Redis, Elasticsearch, OpenSearch, Celery, AWS, ECS, Lambda, S3, RDS, SQS, SNS, Git, CI/CD, Terraform, Terragrunt, pytest, Ruff 🏢 Description: About Us We build B2B legal technology that helps law firms and fund managers work faster and produce high-quality results. Our product helps manage the legal processes used when raising private investment funds. It makes drafting, negotiation, and compliance work easier and faster for lawyers. We use a single-tenant SaaS system hosted on AWS in several regions. Our technology stack includes Python/Django 4.2, React 18 with TypeScript, PostgreSQL, Redis, Elasticsearch/OpenSearch, S3, ECS, and Lambda. Role Overview We are looking for a Senior Back-End Developer to design, build, and improve the APIs, data models, and services behind our product. You will work closely with front-end developers, QA engineers, and DevOps specialists to create reliable, scalable, and secure back-end systems used by global business clients. The ideal candidate has strong experience with Python/Django, AWS services, and distributed systems. They care about performance, clean architecture, and maintainable code. Key Responsibilities Design and build RESTful APIs using Python 3.10+ and Django 4.x / Django REST Framework. Create scalable data models and efficient queries using PostgreSQL, Redis, and Elasticsearch/OpenSearch. Build background jobs and asynchronous tasks using Celery, SQS, and Lambda. Integrate AWS services such as S3, SNS/SQS, CloudFront, ECS, and RDS into application workflows. Take part in code reviews and maintain clean, secure, and well-documented services. Work with DevOps to improve CI/CD pipelines and infrastructure automation. Help plan system architecture, scalability, and performance improvements. Essential Requirements Experience working as a Back-End or Full-Stack Developer in a SaaS environment. Strong knowledge of Python 3.10+ and Django 4.x / Django REST Framework. Experience with PostgreSQL, Redis, and/or Elasticsearch/OpenSearch. Familiarity with Celery, SQS/SNS, and AWS services such as ECS, Lambda, S3, and RDS. Experience with Git, CI/CD processes, and Agile/Scrum development. Strong debugging and problem-solving skills with attention to performance and reliability. Preferred Requirements Experience with infrastructure-as-code tools such as Terraform or Terragrunt and AWS developer tools. Knowledge of authentication systems, role-based access control, and single-tenant architecture. Experience working with text or document processing libraries. Familiarity with testing and code quality tools such as pytest, Ruff, and pre-commit workflows. Personal Attributes Practical engineer who values reliability and clean system design. Analytical and detail-focused problem solver. Comfortable working and communicating in cross-functional Agile teams. Proactive in improving code quality and developer experience. What We Offer Competitive salary and benefits. Remote-first work culture with colleagues from different countries. Opportunity to shape the back-end architecture and services of our global legal-tech product. Experience working with complex enterprise workflows and automation challenges.

🏢 Summary: Full-Stack / Backend Developer role focused on building and maintaining scalable applications and REST APIs that support client products. The position involves developing new integrations, enhancing existing backend and frontend systems, and improving platform performance and reliability. You will contribute to architecture improvements and work within a cloud-based environment. 🗂️ Requirements: Minimum 3 years commercial experience, Experience with Java, Experience with Spring Boot, Experience with AWS, Experience with MongoDB, Experience with PostgreSQL, Experience with React.js, Experience designing REST APIs, Knowledge of backend architecture, Experience with cloud environments, Understanding of clean code principles, Experience working in Agile environment 📃 Skills: Java, SpringBoot, AWS, MongoDB, PostgreSQL, React, REST, Agile, Cloud, Architecture 🏢 Description: We are looking for an experienced Full-Stack / Backend Developer to join our team and help build scalable applications and APIs supporting our clients’ products. You will work on both backend and frontend solutions, contributing to product development, system improvements, and ongoing platform stability. Your Responsibilities Develop new APIs to support client integrations and business features. Maintain and enhance existing backend and frontend applications. Fix bugs and improve application performance and reliability. Upgrade and support operational aspects of the platform. Identify opportunities to improve product quality, architecture, and development processes. Collaborate with developers, product teams, and stakeholders to deliver high-quality solutions. Participate in code reviews and contribute to best engineering practices. Required Skills Minimum 3 years of commercial experience with: Java Spring Boot AWS MongoDB PostgreSQL React.js Experience designing and developing REST APIs. Knowledge of backend architecture and modern web applications. Experience working with cloud-based environments (AWS). Understanding of software development best practices and clean code principles. Ability to work in an Agile development environment.

🏢 Summary: Python Developer role focused on building backend systems and AI/LLM integrations, starting with an open-source AI Red Teaming platform. The position involves developing a modular Python backend with integrations to major AI providers, real-time streaming, evaluation engines, analytics, and AWS deployment. Work includes commercial and open-source projects for international clients. 🗂️ Requirements: 3+ years commercial experience in Python backend development, Experience with Django, FastAPI, or Flask, Experience integrating AI/LLM APIs (e.g. OpenAI, Anthropic), Strong knowledge of PostgreSQL, Experience designing REST APIs, Experience with asynchronous programming in Python, Experience with Docker, Experience with CI/CD pipelines, Experience writing automated tests, Good command of English, Degree in Computer Science or related field 📃 Skills: Python, Django, FastAPI, Flask, PostgreSQL, REST, AsyncIO, Docker, CI/CD, OpenAI, Anthropic, Gemini, AWS, EKS, S3, RDS, WebSockets, SSE, LiteLLM 🏢 Description: We're looking for a Python Developer to join our team and work across a range of commercial and open-source projects focused on Python backend development and AI/LLM solutions. You'll build backends, design integrations with AI model providers, and contribute to products used by international clients. Project description: Your first project will be developing a Python-based backend for an open-source AI Red Teaming platform - a tool that enables organizations to systematically test and evaluate AI/LLM models for safety, fairness, and reliability. The project involves building a modular backend with integrations to major AI model providers (OpenAI, Anthropic, Google Gemini, AWS Bedrock, and others), real-time streaming, evaluation engine, analytics, and deployment on AWS. The platform will be released as an open-source product with a separate managed instance for the client. Requirements: - 3+ years of commercial experience in Python backend development - Experience with at least one modern Python web framework (Django, FastAPI, or Flask) - Practical experience integrating AI/LLM APIs into applications (e.g. OpenAI, Anthropic, or similar providers) - Solid knowledge of PostgreSQL and REST API design - Familiarity with async programming in Python - Experience with Docker and CI/CD pipelines - Experience writing automated tests - Good command of English (daily communication with an international client) - Degree in computer science or a related field Nice to have: - Experience with FastAPI - Experience with LiteLLM or similar LLM abstraction/routing libraries - Experience with real-time streaming (SSE, WebSockets) - Experience with AWS services (EKS, S3, RDS) - Familiarity with React or frontend technologies - Experience with open-source projects What We Offer - Fully remote work within a small, supportive team - Real responsibility from the start - no months of onboarding before you contribute - Variety - multiple projects mean diverse problems and technologies - Opportunities for professional growth, including contributions to open-source projects - A team culture built on transparency, trust, and fast feedback We look forward to hearing from you!

🏢 Summary: Backend Python Developer role owning end-to-end product development across backend systems, from architecture and implementation to deployment. The position focuses on building scalable applications, designing RESTful APIs, and working with cloud and data technologies. You will drive backend architecture decisions and deliver high-quality features in a production environment. 🗂️ Requirements: 8+ years of professional software engineering experience, Strong production experience with Python, Experience building scalable, high-quality applications, Deep understanding of backend architecture, Strong knowledge of RESTful API design, Strong experience with PostgreSQL, Hands-on experience with AWS, Experience with Elasticsearch, Experience working in Agile environments, Experience with Test-Driven Development (TDD) 📃 Skills: Python, PostgreSQL, AWS, Elasticsearch, REST, TDD, Agile, GCP, Snowflake, TypeScript, PHP, JavaScript 🏢 Description: Role Overview We’re looking for a Backend Python Developer to take ownership of product development across backend systems. You’ll work across the full development lifecycle — from architecture and implementation through to deployment — partnering closely with Product and Engineering. Must Have (Non-Negotiable) Strong hands-on experience with Python in production environments 8+ years of experience building scalable, high-quality software applications Deep understanding of backend architecture and RESTful API design Strong experience with relational databases (PostgreSQL preferred) Hands-on experience with AWS Proven ability to design, build, and ship end-to-end features independently Nice to Have TypeScript PHP Basic familiarity with JavaScript Elasticsearch Snowflake or modern data warehousing platforms Familiarity with GCP Key Responsibilities Product Development: Lead the development efforts, taking ownership of the entire product lifecycle from ideation to implementation. Collaborate with cross-functional teams, including product managers and engineers, to deliver high-quality products. Technical Leadership: Apply expertise in technologies to drive the adoption of new architectures and design patterns for our products. Mentor and guide junior developers, fostering a culture of continuous learning and improvement within the team. Innovation and Best Practices: Actively contribute to the evolution of our technical stack, ensuring it aligns with industry standards and supports scalability and maintainability. Cross-Functional Collaboration: Work closely with cross-functional teams to ensure backend systems effectively support product requirements. Your Professional Qualifications 🌟 Core Experience & Technical Skills Extensive Experience: 8+ years of professional experience as a Software Engineer delivering high-quality, scalable applications. Mandatory Backend Expertise: Proven, in-depth experience with Python Database Proficiency: Strong experience with relational databases, specifically PostgreSQL (Postgres). Search & Indexing: Direct experience designing, implementing, and optimizing solutions using Elasticsearch. Cloud Computing: Hands-on experience with AWS (mandatory), with familiarity with GCP as a bonus. Data Warehouse (Nice to Have): Experience working with modern data warehousing solutions like Snowflake. 🏗️ Architecture & Design Component Design: Experience with a shared component design paradigm utilizing controller-based patterns. Application Implementation: Proven track record of implementing applications effectively using established style guides and detailed wireframes. Backend Principles: Strong understanding of backend architecture principles and best practices for RESTful design. 📈 Development Methodologies & Teamwork Agile Development: Comfortable working in Agile environments and proficient in Test-Driven Development (TDD) methodologies. Collaboration: Highly team-oriented and collaborative, with the proven capacity to mentor junior team members and elevate team skill levels. Leadership & Communication: Demonstrated leadership ability combined with excellent written and verbal English skills. About Mozaiq Mozaiq is a fully remote team with roots in the US and Eastern Europe. We build powerful, cross-functional teams that support some of the most sophisticated tech and marketing organizations in the world. 🌐 Global Family: A tight-knit, multicultural, remote-first team 💼 Meaningful Work: Support world-class brands and products 🤝 Inclusive Culture: We prioritize collaboration, clarity, and growth Perks & Benefits 🌍 Work from anywhere ⏳ Flexible hours 🏝 Paid time off + holidays 🛫 Team offsites 🩺 Subsidised Health insurance

🏢 Summary: Remote Backend Python Developer role for a long-term pharmaceutical project focused on building secure, scalable, and high-quality backend services and REST APIs in a regulated environment. The position emphasizes clean, testable code, robust API design, and close collaboration with DevOps to ensure performance and reliability. Strong experience with modern Python ecosystem and cloud infrastructure is required. 🗂️ Requirements: Strong experience with Python 3.12+, Experience designing and implementing REST APIs, Hands-on experience with FastAPI and Pydantic, Practical knowledge of JWT authentication mechanisms, Experience with asynchronous programming, Ability to write typed Python code using typing, Experience with SQLAlchemy 2.0, Ability to write efficient SQL queries, Experience creating and maintaining unit tests, Knowledge of Dependency Injection principles, Experience with OpenAPI/Swagger documentation, Basic experience with Docker image creation, Ability to read and modify GitLab CI/CD pipelines, Practical experience with AWS services (EKS, ECR, Load Balancing) 📃 Skills: Python, FastAPI, Pydantic, SQLAlchemy, SQL, JWT, REST, OpenAPI, Swagger, Docker, GitLab, AWS, EKS, ECR, LoadBalancing, asyncio, typing, DependencyInjection, Decorators, ContextManagers, UnitTesting 🏢 Description: Backend Python Developer We are looking for an experienced Backend Python Developer to join a long‑term project for the pharmaceutical industry . The project focuses on building reliable, secure, and scalable backend services that support critical business and data-driven processes in a regulated environment. High code quality, testability, and well-designed APIs are key success factors. Work mode: 100% remote Tasks Designing and implementing backend services with a strong focus on API quality and reliability Creating well-structured, self-documented REST APIs Writing clean, maintainable, and testable Python code Collaborating closely with other engineers and DevOps teams Ensuring performance, security, and scalability of implemented solutions Requirements Solid understanding of best practices for API endpoint design and error handling Practical knowledge of JWT tokens and authentication mechanisms Strong experience with Python 3.12 or newer Writing correctly typed code using Python typing Practical experience with asynchronous programming Knowledge of decorators and context managers Habit of writing unit tests alongside production code Hands-on experience with FastAPI and Pydantic Good understanding of Dependency Injection Ability to design correct and robust models (validation, sanitization) Experience with self-documenting APIs using OpenAPI/Swagger Practical experience with SQLAlchemy 2.0 Ability to write clear and reasonably efficient database queries Basic understanding of Docker image creation principles Ability to read and modify GitLab CI/CD pipelines Practical experience navigating AWS services , especially: EKS, ECR, Load balancing Fluent English We offer Ongoing support from a dedicated agent , taking care of your project continuity, client contact, necessary formalities, work comfort and development, Consultant Development Program – advice on growth planning based on the latest trends and market needs in IT, including consultations with agents and growth mentors, Access to 7N Learning & Development – a development and educational platform with webinars, a library of articles and industry reports, and regular invitations to one-time and recurring development events – technical, business, and lifestyle, Spectacular integration events , both for you (e.g., annual Kick-Off trip , Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g., family picnics, movie premieres), Professional development not only during the project – you can get involved in knowledge transfer to others within the 7N Services offering directed at 7N clients, Relationships and access to the knowledge of the most experienced IT experts in the market – the average professional tenure of our consultants in Poland is over 10 years, A complete benefits package , including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad. About 7N Constantly searching for projects, difficult rate negotiations, lack of development support – sounds familiar? At 7N, you gain not only stability of contracts but also the personal involvement of a dedicated agent who ensures your professional comfort and continuous access to development initiatives. Our mission is to provide stable and rewarding collaborations that drive your success as an IT expert and the success of our clients. We build long-lasting relationships based on Scandinavian values and 30 years of experience creating IT solutions for over 200 organizations.