Senior Back End Developer

2 weeks ago

ClujNapoca, Cluj, Romania YELO Software Full time €30,000 - €60,000 per year

What You'll Do

● Participate in the full software development lifecycle—from planning and design to

development, deployment, and monitoring.

● Design and implement a scalable backend platform and microservices using Python

(FastAPI) or

● Build and optimize complex queries and data models using PostgreSQL, ensuring

high performance at scale.

● Develop and manage cloud-native infrastructure on AWS, leveraging services such

as Lambda, ECS, API Gateway, and S3.

● Integrate third-party AI services (e.g., OpenAI, Gemini, AWS Bedrock) to power

conversational and automation features.

● Collaborate with product managers and backend engineers to define and deliver

impactful technical solutions.

● Actively participate in code reviews, architecture discussions, and continuous

engineering process improvements.

What We're Looking For

● 4+ years of backend development experience with Python (FastAPI) or

● Strong experience with PostgreSQL, including schema design, indexing, query

optimization, and complex SQL logic.

● Proven ability to design and build cloud-native applications on AWS, using services

such as ECS, S3.

● Experience integrating AI/ML APIs (e.g., OpenAI, AWS Bedrock, Gemini) into

real-world applications.

● Solid understanding of distributed systems and asynchronous processing, with

experience designing for scalability, fault tolerance, and high availability.

● Experience building and maintaining event-driven architectures

● Familiarity with system design principles, including tradeoffs in database models,

caching strategies, consistency models, and modular API boundaries.

● Experience with observability tooling (e.g., CloudWatch, Datadog, Sentry) and

building systems with operational visibility in mind.

● Strong foundation in software development best practices, including unit testing,

integration testing, Git workflows, and CI/CD pipelines.

● Comfortable in an agile, iterative development process with regular code reviews and

architecture discussions.

Strong written and verbal communication skills, with the ability to clearly document

and explain decisions and systems.

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