Senior Backend Developer

Senior Backend Developer

Build the Core of AI-Driven Marketing Platforms

Who We Are

Keenfolks is a next-generation AI marketing agency, where technology, data, and strategy come together to build intelligent, scalable platforms for global brands.

We don’t just “use” AI — we design and build proprietary AI-powered systems that enable personalization, automation, and data-driven decision-making at scale. Our mission is to bridge the gap between marketing needs and emerging AI technologies, turning complex ideas into real-world impact.

We are a multidisciplinary team of engineers, data scientists, and strategists who value collaboration, ownership, and continuous learning.

Role Overview

We’re looking for a Senior Backend Developer to help design, build, and scale the backend services that power our AI-driven marketing platforms.

In this role, you’ll work hands-on developing robust backend systems, integrating AI and data pipelines, and ensuring our platforms are reliable, secure, and cloud-ready. You’ll collaborate closely with AI engineers, DevOps, and product stakeholders to deliver production-grade solutions used by international clients.

This role is ideal for someone who enjoys deep backend work, modern architectures, and applying AI technologies in real products.

Key Responsibilities

Backend Development (≈70%)

• Design, develop, and maintain RESTful and GraphQL APIs


• Build backend services using Python (FastAPI, Flask) or Node.js


• Implement and optimize data flows interacting with AI/ML models


• Work with relational and non-relational databases (PostgreSQL, Redis, MongoDB)


• Ensure code quality through testing, documentation, and code reviews


• Optimize performance, scalability, and reliability of backend systems

Cloud, AI & Integrations (≈30%)

• Deploy and manage backend services on AWS, Azure, or GCP


• Containerize applications using Docker and orchestrate with Kubernetes


• Support CI/CD pipelines using GitHub Actions, Terraform, or Bicep


• Integrate with AI platforms and tools (OpenAI APIs, LangChain, vector databases)


• Implement authentication, monitoring, and observability solutions


• Collaborate with DevOps and architects on cloud and infrastructure decisions

Requirements

Must-Have

• Strong experience with Python (FastAPI, Flask) or Node.js


• Solid backend engineering experience in production environments


• Experience working with PostgreSQL and Redis


• Cloud experience on AWS, Azure, or GCP


• Hands-on experience with Docker and basic Kubernetes


• Familiarity with CI/CD pipelines and Infrastructure-as-Code concepts


• Experience integrating APIs and external services


• Advanced English (daily communication with international teams)

Nice to Have

• Experience working with AI/ML tools (OpenAI API, LangChain, RAG pipelines)


• Knowledge of dbt, Spark, or data processing pipelines


• Experience with MongoDB or other NoSQL databases


• Familiarity with monitoring and observability tools (Sentry, Prometheus, Grafana)


• Understanding of authentication mechanisms (OAuth2, JWT)


• Experience in fast-paced startup or scale-up environments

Your Mindset

At Keenfolks, we value backend engineers who:

• Enjoy solving complex technical challenges


• Care deeply about code quality, scalability, and security


• Are curious about AI and modern backend architectures


• Collaborate well with cross-functional teams


• Take ownership and responsibility for what they build

What We Offer

• Hybrid work model: 2 days in the office, 3 remote


• Free lunch on office days


• Daily snacks, coffee, and fruit ☕


• Office activities: ping-pong, yoga & more ♀


• 30 days working from abroad


• Birthday day off


• 23 vacation days + 2 personal days


• A tech-focused environment with real AI applications in production


• Opportunities to grow technically and work on cutting-edge platforms

Diversity Matters

We are committed to building an inclusive, diverse, and equitable workplace where everyone can grow, contribute, and make an impact. Different perspectives make better technology — and better teams.