Senior Back End Engineer

Hey Alfie; Warszawa; Hybrid; PLN 240,000 - 360,000; Full time

Job summary

Hey Alfie is seeking an experienced Senior Backend Engineer to own backend features, build scalable REST APIs with Python and FastAPI, and shape cloud infrastructure on AWS. You will partner with the CTO and product manager to translate ideas into production, while mentoring junior developers and ensuring high-quality delivery.

The role is fully remote, offering autonomy to influence product direction and oversee projects from inception through launch.

Qualifications

• Minimum 5 years of backend development experience.
• Expertise in REST API development using Python.
• Experience with AWS cloud infrastructure.
• Proficient in Git, CI/CD pipelines, Docker and Kubernetes.
• Ability to thrive in a fast-paced startup environment.
• Excellent problem-solving and ownership.
• Fluent English (B2+).

Responsibilities

• Lead the development of the REST API using Python on FastAPI framework, ensuring robust, scalable solutions.
• Develop and maintain cloud infrastructure on AWS.
• Collaborate with the CTO and product manager to define technical requirements.
• Drive architecture for scalable, highly available features with business tradeoffs.
• Maintain high code quality with reviews and best practices.
• Write unit, feature and end-to-end tests.
• Develop CI/CD pipelines to ensure quality delivery.
• Document technical decisions and API design.
• Mentor junior developers and promote learning within the team.

Skills

Python

REST API development

CI/CD pipelines

Git

English communication

Tools

AWS

Docker

Kubernetes

FastAPI

Git

Job description

As a Senior Back End Engineer, you will play a pivotal role in building scalable, fast and highly available API alongside cloud infrastructure from the ground up. Reporting directly to the CTO, you are expected to take ownership of the key features from the Back End perspective, utilising your extensive knowledge of Python and AWS. This position is fully remote. Ideal candidates will be proactive and eager to embrace challenges, possessing the autonomy to significantly influence product direction and oversee projects from inception through to launch.

Responsibilities

• Lead the development of the REST API using Python on FastAPI framework, ensuring robust, scalable, and high-performance solutions.
• Develop and maintain cloud infrastructure on AWS.
• Collaborate closely with the CTO and product manager to define technical requirements and transform visionary ideas into tangible products.
• Drive the architecture and build of new features, focusing simultaneously on scalability and high availability while making tradeoffs with the business.
• Uphold high standards of code quality and maintainability with thorough code reviews and adherence to best development practices.
• Write comprehensive unit, feature and e2e tests.
• Develop CI/CD pipelines to ensure high quality of software delivery.
• Document technical decisions and API.
• Take initiative in problem-solving, proactively identifying and addressing potential setbacks throughout the development lifecycle.
• Mentor junior developers, fostering a culture of learning and continuous improvement within the team.

Requirements

• Minimum of 5 years of experience in backend development, with expert-level proficiency in REST API development using Python.
• Experienced and proficient in developing cloud infrastructure, ideally on AWS.
• Knowledge of software development best practices, including version control (Git), CI/CD pipelines, and containerization (Docker, Kubernetes).
• Experience working in a fast-paced, startup environment where rapid prototyping and iterative development are paramount.
• Excellent problem-solving skills, with a strong sense of ownership and accountability.
• Outstanding communication and collaboration skills, with the ability to lead projects and interface directly with senior management.
• Fluent English with a minimum of B2+ level, enabling effective communication in a professional setting.
• Familiarity with Gen AI technologies is a plus.