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Anatolii K., Python Software Engineer

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- 4 years of experience in the IT industry as a Python Engineer - Proficient in using technologies such as Django DRF, Flask, Pandas, BeautifulSoup, SQLAlchemy, Asyncio, Flask + Marshmallow, Apscheduler, Jinja, Quip API, Docker, Nginx, Amazon MWS API, Amazon SP-API, Google API, and Telegram API; - Strong in refactoring, bug-fixing, and working with Python, JavaScript, Django, Django Rest Framework; - Skilled in developing faceted search and matching algorithms using ElasticSearch; - Experienced in PDF generation and importing from various formats; - Developed web applications, API interfaces, and automated scripts for data transformation; - Previous experience includes working as a Python developer focused on data scraping for Amazon, eBay, and Walmart products in dropshipping projects; - Also worked as a C# developer on various projects, specializing in web development, scraping, and parsing data; - Upper-Intermediate English; - Available ASAP

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Andrii Kh., Python Software Engineer

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- Python Engineer with 5+ years of experience designing, developing, and maintaining web applications and services across diverse industries (Financial Services, Healthcare, E-commerce, Education). - Proficient in both full-stack and backend development utilizing Python frameworks like Django, FastAPI, and Nameko. - Designed and implemented microservices for financial trading platform, healthcare platform, and more. - Extensive experience with relational (MySQL, PostgreSQL) and NoSQL databases (MongoDB, Redis). Optimized queries using Django ORM and SQLAlchemy. - Utilized AWS S3 for storage and integrated with various cloud services (Stripe, Auth0, Pipedrive). - Strong computer science expertise and commercial experience in web services architecture and development - Experience with scrapers, extracting data from sites, serializing and validating data

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Dmitry F, Lead Python Engineer

Kryvyi Rih, Ukraine
Last Updated: 4 Jul 2023

- 10+ years of experience in Analysis, Design, Development and Implementation of various web, stand-alone, client-server applications using Python; good Experience with Python web frameworks such as Django, Flask, Pyramid Framework, Tornado, Twisted, AioHTTP; have work experience with various Python Integrated Development Environments like PyCharm, Eclipse, Emacs; - Expertise in handling Django ORM and SQLAlchemy; experienced in developing applications using Agile Methodologies, Waterfall Methodology and Scrum stories in a python based environment; - Have knowledge in relational databases like MySQL (MariaDB),PostgresSQL, Firebird; have knowledge in NoSQL databases like Redis, MongoDB; - Upper-Intermediate English

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Spain
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Experienced software engineer with a strong background in computer science and a focus on full-stack development. - Strong skills with Python, Node.js, and JavaScript; - Expertise in frameworks Flask, Django, and React; - Skilled in working with databases including PostgreSQL, SQLite, MySQL, and Redis; - Deep skills with technologies like Docker and Elasticsearch; - Extensive experience in developing RESTful APIs, GraphQL, and Fast API, with a solid understanding of CI/CD processes. - Knowledgeable in machine learning techniques, particularly neural networks like darknet and caffe; - Demonstrated success in optimizing software performance, improving productivity, and implementing system integrations; - Strong problem-solving and collaboration skills, with a track record of mentoring and leading teams in technical projects.

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Georgia
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Software Engineer with 5 years of experience, specializing in backend and frontend development, as well as DevOps practices. Proficient in Python, JavaScript, and TypeScript, with extensive knowledge of frameworks like FastAPI, Django, Flask, React, and Redux. Demonstrates a strong background in Computer Science and Software Engineering with tangible success in designing robust systems, including microservices and monoliths. Proven expertise with cloud platforms AWS and Azure, and in utilizing various databases such as PostgreSQL, Redis, MongoDB, and DynamoDB. Skilled in CI/CD implementation, containerization with Docker and Kubernetes, and infrastructure as code with Terraform. Impressive track record of project roles, emphasizing performance optimization, architectural design, and integration of machine learning models into production. Holds a significant portfolio of projects across diverse domains such as logistics, social life science, and healthcare.

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Table of Contents

TOP 14 Facts about SQLAlchemy

  • SQLAlchemy is an open-source Python library that provides a set of high-level API for interacting with relational databases.
  • It was first released in 2006 and has since become one of the most popular Python libraries for database development.
  • SQLAlchemy supports multiple database management systems including PostgreSQL, MySQL, SQLite, Oracle, and Microsoft SQL Server.
  • One of the key features of SQLAlchemy is its Object-Relational Mapping (ORM) system, which allows developers to map database tables to Python classes and perform database operations using object-oriented programming techniques.
  • With SQLAlchemy’s ORM, developers can write database queries and manipulate data using Python code, abstracting away the complexities of SQL syntax.
  • SQLAlchemy provides a powerful Query API that allows developers to build complex database queries using a fluent interface, making it easier to express complex filtering, joining, and aggregation operations.
  • It supports both declarative and imperative styles of ORM, giving developers flexibility in how they define and interact with database models.
  • SQLAlchemy has a comprehensive set of features for handling database transactions, including support for nested transactions, savepoints, and two-phase commit protocols.
  • It offers advanced caching mechanisms to improve performance by reducing the number of database queries and optimizing data retrieval.
  • SQLAlchemy allows developers to work with databases using a variety of Python programming paradigms, including synchronous, asynchronous, and event-driven programming.
  • It provides support for database migrations through its built-in Alembic tool, which offers versioning, schema diffing, and the ability to generate migration scripts.
  • SQLAlchemy has a large and active community of developers who contribute to its development and provide support through online forums and mailing lists.
  • It is extensively documented with comprehensive API reference, tutorials, and examples, making it easy for developers to get started and learn the library.
  • SQLAlchemy is used by many popular companies and organizations, including Facebook, Reddit, Yelp, and Pinterest, highlighting its widespread adoption and reliability.

Soft skills of a SQLAlchemy Developer

Soft skills are essential for a SQLAlchemy Developer to effectively collaborate and communicate with other team members and stakeholders. These skills contribute to the overall success of the development process and the ability to deliver high-quality solutions.

Junior

  • 1. Strong Problem-Solving Skills: Able to analyze and solve complex problems efficiently.
  • 2. Effective Communication: Communicates clearly and effectively with team members and stakeholders.
  • 3. Adaptability: Demonstrates flexibility and adaptability in a fast-paced development environment.
  • 4. Attention to Detail: Pays attention to the smallest details to ensure accuracy and quality in code implementation.
  • 5. Teamwork: Works well in a team, collaborates with others, and actively participates in discussions and code reviews.

Middle

  • 1. Leadership: Takes initiative and leads small development tasks or projects.
  • 2. Time Management: Manages time effectively to meet project deadlines and deliverables.
  • 3. Strong Analytical Skills: Able to analyze complex requirements and propose efficient solutions.
  • 4. Collaboration: Works effectively with cross-functional teams and stakeholders to gather requirements and provide technical guidance.
  • 5. Continuous Learning: Demonstrates a desire to learn and stay updated with the latest technologies and best practices.
  • 6. Problem-Solving: Able to identify and resolve complex technical issues efficiently.
  • 7. Self-Motivation: Takes ownership of tasks and drives them to completion independently.

Senior

  • 1. Mentorship: Provides guidance and mentorship to junior and middle-level developers.
  • 2. Decision Making: Makes informed decisions and provides technical recommendations based on extensive experience.
  • 3. Conflict Resolution: Effectively resolves conflicts and promotes a positive team dynamic.
  • 4. Stakeholder Management: Manages relationships with stakeholders and ensures their requirements are met.
  • 5. Project Management: Demonstrates strong project management skills, including planning, organizing, and coordinating complex development projects.
  • 6. Code Review: Conducts thorough code reviews to ensure code quality and adherence to best practices.
  • 7. Collaboration: Collaborates effectively with cross-functional teams to align technical solutions with business goals.
  • 8. Strategic Thinking: Able to think strategically and align technical decisions with long-term business objectives.

Expert/Team Lead

  • 1. Technical Leadership: Provides technical leadership to the development team, guiding architectural decisions and ensuring code quality.
  • 2. Team Management: Manages and motivates a team of developers, assigning tasks and ensuring timely delivery.
  • 3. Communication Skills: Communicates complex technical concepts effectively to both technical and non-technical stakeholders.
  • 4. Innovation: Drives innovation and explores new technologies to enhance the development process and improve efficiency.
  • 5. Strategic Planning: Develops long-term strategies and roadmaps for the development team and aligns them with the organization’s goals.
  • 6. Risk Management: Identifies and mitigates risks associated with development projects.
  • 7. Quality Assurance: Implements and enforces quality assurance processes to ensure the delivery of high-quality software solutions.
  • 8. Agile Methodologies: Expertise in agile methodologies and able to effectively lead and manage development projects using agile practices.
  • 9. Client Relationship Management: Manages client relationships and ensures client satisfaction with the delivered solutions.
  • 10. Technical Documentation: Creates comprehensive technical documentation to facilitate knowledge sharing and maintain codebase integrity.
  • 11. Continuous Improvement: Drives continuous improvement initiatives within the development team and implements best practices to optimize the development process.

TOP 10 SQLAlchemy Related Technologies

  • Python

    Python is a popular programming language for SQLAlchemy software development. It is known for its simplicity, readability, and versatility. Python provides a wide range of libraries and frameworks that integrate seamlessly with SQLAlchemy, making it an ideal choice for developers.

  • SQLAlchemy

    SQLAlchemy is a powerful and flexible Object-Relational Mapping (ORM) tool for Python. It simplifies the process of working with databases by providing a high-level interface to interact with them. SQLAlchemy supports multiple database systems and offers advanced features like query building, transaction management, and schema generation.

  • Flask

    Flask is a lightweight web framework written in Python. It is widely used for building web applications and APIs. Flask integrates well with SQLAlchemy, allowing developers to easily create database-backed applications. With its modular design and extensive documentation, Flask is a popular choice among SQLAlchemy developers.

  • Django

    Django is a high-level web framework that follows the Model-View-Controller (MVC) architectural pattern. It provides built-in support for database integration through its Object-Relational Mapping (ORM) layer, which is powered by SQLAlchemy. Django offers a robust set of features for rapid application development and is widely adopted in the industry.

  • PostgreSQL

    PostgreSQL is a powerful open-source relational database management system. It is known for its reliability, scalability, and extensive feature set. SQLAlchemy has excellent support for PostgreSQL, making it a popular choice for developers working with complex data models and large datasets.

  • MySQL

    MySQL is a widely used open-source relational database management system. It is known for its speed, scalability, and ease of use. SQLAlchemy provides comprehensive support for MySQL, allowing developers to build efficient and reliable database applications.

  • SQLite

    SQLite is a lightweight, serverless, and self-contained relational database engine. It is widely used in embedded systems and mobile applications. SQLAlchemy offers full support for SQLite, making it an excellent choice for developers who require a simple and portable database solution.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior Developer0-2 yearsAssist in the development of software applications, perform coding tasks, debug and troubleshoot issues, collaborate with team members, and learn new technologies and programming languages.$45,000 – $65,000
Middle Developer2-5 yearsTake ownership of smaller tasks and modules within a project, participate in code reviews, collaborate with team members, provide technical guidance to junior developers, and contribute to the overall design and architecture of the software.$65,000 – $85,000
Senior Developer5-10 yearsLead the development of complex software solutions, design and implement critical components, mentor and guide junior and middle developers, collaborate with cross-functional teams, and contribute to decision-making regarding technology stacks and project timelines.$85,000 – $110,000
Expert/Team Lead Developer10+ yearsAct as a technical leader, oversee the development process, make architectural decisions, guide and mentor the entire development team, collaborate with stakeholders, manage project timelines and resources, and ensure the delivery of high-quality software solutions.$110,000 – $150,000+

Cases when SQLAlchemy does not work

  1. Unsupported Database: SQLAlchemy is a powerful and versatile Python ORM (Object-Relational Mapping) library that supports a wide range of databases including PostgreSQL, MySQL, SQLite, and Oracle. However, there are certain databases that are not supported by SQLAlchemy. For example, if you are working with a NoSQL database like MongoDB or Cassandra, SQLAlchemy may not be the most suitable choice since it primarily focuses on relational databases.
  2. Missing Database Connector: SQLAlchemy relies on database connectors or drivers to establish a connection with the respective database. If you are trying to use SQLAlchemy with a database for which a connector is not available or properly installed, you may face compatibility issues. For instance, if you intend to use SQLAlchemy with Microsoft SQL Server but do not have the required ODBC driver or FreeTDS installed, you may encounter difficulties in establishing a connection.
  3. Outdated SQLAlchemy Version: SQLAlchemy is actively maintained and new versions are released periodically to introduce bug fixes, enhancements, and support for the latest features of the supported databases. If you are using an outdated version of SQLAlchemy, you may encounter compatibility issues with newer versions of databases or face bugs that have been fixed in the latest releases. It is always recommended to stay up-to-date with the latest version of SQLAlchemy to ensure optimal compatibility and stability.
  4. Incompatible Python Version: SQLAlchemy requires a compatible Python interpreter to function properly. If you are using an older version of Python that is not supported by SQLAlchemy, you may face compatibility issues. For example, if you are using SQLAlchemy version 1.4 or higher, Python versions below 3.6 are not supported. It is crucial to ensure that your Python version meets the minimum requirements specified by SQLAlchemy.
  5. Conflicting Dependencies: SQLAlchemy depends on various Python packages and libraries to provide its functionality. In some cases, there might be conflicts or compatibility issues between the versions of these dependencies and the version of SQLAlchemy you are using. These conflicts can lead to unexpected behavior or errors. It is advisable to carefully manage your project’s dependencies and ensure that there are no conflicting versions that could affect the smooth functioning of SQLAlchemy.

Pros & cons of SQLAlchemy

7 Pros of SQLAlchemy

  • Flexibility: SQLAlchemy provides a flexible and powerful Object-Relational Mapping (ORM) framework that allows developers to map Python objects to database tables, making it easier to work with databases in a more object-oriented way.
  • Database Compatibility: SQLAlchemy supports a wide range of database systems including popular ones like PostgreSQL, MySQL, SQLite, Oracle, and Microsoft SQL Server. This compatibility allows developers to seamlessly switch between different databases without significant code changes.
  • Query Building: SQLAlchemy offers a comprehensive query API that allows developers to construct complex database queries using a high-level and intuitive syntax. It provides a rich set of query operators, functions, and expressions to facilitate data retrieval and manipulation.
  • Transaction Management: SQLAlchemy provides robust transaction management capabilities, allowing developers to handle database transactions with ease. It supports both explicit and implicit transaction management, ensuring data integrity and consistency.
  • Performance Optimization: SQLAlchemy offers various features to optimize database performance. It provides query caching, connection pooling, and lazy loading techniques to minimize unnecessary database round-trips and enhance application performance.
  • Data Integrity: SQLAlchemy helps developers maintain data integrity by supporting declarative constraints and referential integrity. It allows defining relationships between tables, enforcing foreign key constraints, and performing cascading operations to ensure consistent data across the database.
  • Modularity: SQLAlchemy is designed as a modular toolkit, allowing developers to use only the necessary components based on their specific needs. This modularity promotes code reusability, maintainability, and makes it easier to integrate SQLAlchemy with existing applications.

7 Cons of SQLAlchemy

  • Learning Curve: SQLAlchemy has a steep learning curve compared to simpler database libraries or raw SQL. Developers need to familiarize themselves with its ORM concepts, query API, and various configuration options.
  • Performance Overhead: While SQLAlchemy provides performance optimization features, it introduces an additional layer between Python and the database. This layer can impose some performance overhead compared to directly using raw SQL queries.
  • Complexity for Simple Projects: For simple projects or small databases, using an ORM like SQLAlchemy may introduce unnecessary complexity. In such cases, using a simpler database library or raw SQL queries can be more straightforward and efficient.
  • Debugging Challenges: When using an ORM, debugging database-related issues can be more challenging compared to directly inspecting and modifying SQL queries. Understanding the generated SQL queries and diagnosing performance bottlenecks may require additional effort.
  • Limited SQL Features: SQLAlchemy’s ORM abstracts away many SQL features, which can limit the ability to leverage database-specific functionalities or optimize queries using advanced SQL techniques. Developers may need to resort to raw SQL queries in some cases.
  • Compatibility Constraints: While SQLAlchemy supports multiple databases, certain database-specific features or optimizations may not be fully compatible across different database systems. This can limit the flexibility or performance benefits in certain scenarios.
  • Overhead for Small Projects: For small projects with relatively simple database interactions, using an ORM like SQLAlchemy might introduce unnecessary overhead in terms of code complexity and maintenance.

How and where is SQLAlchemy used?

Case NameCase Description
1. Web Application DevelopmentSQLAlchemy is widely used in web application development to interact with databases. It provides an Object Relational Mapping (ORM) layer which allows developers to work with databases using Python objects and classes. This simplifies database operations such as querying, inserting, updating, and deleting records, making it easier and more efficient to build web applications that require database interactions.
2. Data Analysis and ReportingSQLAlchemy is often utilized in data analysis and reporting tasks. With its powerful querying capabilities, SQLAlchemy enables developers to retrieve and manipulate data from databases with ease. It supports various SQL operations and provides a flexible and intuitive API for complex queries. This makes it a valuable tool for data analysts and researchers who need to extract insights from large datasets and generate reports based on their findings.
3. Microservices ArchitectureSQLAlchemy is well-suited for building microservices architectures, where applications are divided into smaller, loosely coupled services. It allows each microservice to have its own database connection and ORM instance, ensuring data isolation and modularity. SQLAlchemy’s declarative syntax and rich set of features make it convenient to develop and manage multiple independent services that interact with different databases.
4. Geospatial Data ProcessingSQLAlchemy provides support for geospatial data processing, making it a valuable tool for applications that deal with location-based services, mapping, and spatial analysis. It integrates with popular geospatial libraries such as GeoAlchemy and PostGIS, allowing developers to store, query, and analyze geographic data efficiently. This enables the development of applications that require geospatial functionality, such as finding nearest locations or performing spatial computations.
5. Test and Mocking FrameworksSQLAlchemy is often used in test and mocking frameworks to simulate database interactions during unit testing. It provides a lightweight in-memory SQLite database engine, which allows developers to create temporary databases for testing purposes. This enables them to write test cases that involve database operations without the need for a real database connection. SQLAlchemy’s flexibility and support for different database engines make it a popular choice for testing frameworks in various programming languages.

What are top SQLAlchemy instruments and tools?

  • SQLAlchemy: SQLAlchemy is a popular Python SQL toolkit and Object-Relational Mapping (ORM) library. It was first released in 2006 and has since become one of the most widely used tools for working with databases in Python. SQLAlchemy provides a high-level, intuitive API for interacting with databases, allowing developers to write database queries and manipulate data using Python objects. It supports multiple database backends, including PostgreSQL, MySQL, SQLite, and Oracle, making it versatile and suitable for a wide range of applications.
  • Flask-SQLAlchemy: Flask-SQLAlchemy is an extension for the Flask web framework that integrates SQLAlchemy into Flask applications. It provides a convenient way to define database models using Python classes and interact with the database within Flask routes. Flask-SQLAlchemy simplifies database operations in Flask applications by handling common tasks such as session management and query generation. It allows developers to focus on writing the application logic without worrying about low-level database details.
  • Alembic: Alembic is a lightweight database migration tool built on top of SQLAlchemy. It allows developers to manage database schema changes and versioning in a structured and automated manner. Alembic supports multiple database backends and provides a command-line interface for performing migrations. It generates migration scripts based on the changes made to the SQLAlchemy models and applies those scripts to the database. Alembic is widely used in SQLAlchemy projects to handle database schema evolution over time.
  • SQLAlchemy-Utils: SQLAlchemy-Utils is a collection of utility functions and data types that complement SQLAlchemy. It provides additional functionality for working with SQLAlchemy, such as custom data types, query enhancements, and database-specific utilities. SQLAlchemy-Utils includes features like composite primary keys, JSON and UUID data types, improved query options, and more. It aims to simplify common tasks and add extra flexibility to SQLAlchemy projects.
  • SQLAlchemy-Searchable: SQLAlchemy-Searchable is an extension for SQLAlchemy that enables full-text search capabilities in SQLAlchemy models. It integrates with popular full-text search engines like PostgreSQL’s full-text search and Elasticsearch. SQLAlchemy-Searchable allows developers to perform powerful text searches on database models without the need for complex SQL queries. It provides a convenient API for indexing and searching text-based data, making it easier to build search functionality into SQLAlchemy applications.
  • SQLAlchemy-Continuum: SQLAlchemy-Continuum is an extension for SQLAlchemy that adds versioning and history tracking to database models. It allows developers to track changes to database records over time and provides an easy way to query historical data. SQLAlchemy-Continuum automatically creates version tables and tracks changes made to SQLAlchemy models, including inserts, updates, and deletes. It is useful for auditing purposes, data analysis, and implementing features like undo/redo functionality.
  • SQLAlchemy-ImageAttach: SQLAlchemy-ImageAttach is an extension for SQLAlchemy that simplifies handling and storing of image files in databases. It provides a convenient way to associate images with SQLAlchemy models and handles image file management, including resizing, cropping, and generating thumbnails. SQLAlchemy-ImageAttach supports various storage backends, such as local file system, Amazon S3, and Google Cloud Storage. It is well-suited for applications that require image uploads and manipulation.
  • SQLAlchemy-JSONField: SQLAlchemy-JSONField is an extension for SQLAlchemy that adds support for storing JSON data in databases. It provides a JSON data type that can be used in SQLAlchemy models, allowing developers to store and retrieve JSON data seamlessly. SQLAlchemy-JSONField handles serialization and deserialization of JSON data automatically, making it easy to work with JSON in database applications. It supports various database backends, including PostgreSQL, MySQL, and SQLite.

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