Blumbit

Senior Backend Developer (CRM from scratch)

We’re looking for a Senior Backend Developer to build a CRM system from scratch. You’ll have a strong impact on architecture, product decisions, and business logic.

Responsibilities:

• Design and develop CRM architecture from scratch
• Build and optimize databases
• Develop APIs (REST / GraphQL / Webhooks)
• Implement business logic (sales pipeline, roles, access control)
• Integrate with external services
• Ensure data security and integrity

Must-have:

• 3+ years of backend development experience
• Strong SQL and database design skills (normalization, indexing, optimization, ER-diagrams)
• Experience with APIs (REST / GraphQL / SOAP, Webhooks)
• One of the stacks: Python / Node.js / PHP
• Docker + cloud platforms (AWS / GCP / Azure)
• NoSQL (Redis / MongoDB)
• Understanding of RBAC, audit logging, data security (GDPR, encryption)
• Experience with ETL processes and data handling (validation, cleaning)

Nice to have:

• Experience building CRM systems
• Strong business/system analysis skills

We offer:

• Build a CRM from scratch (no legacy)
• High impact on technical decisions
• Fast processes, no bureaucracy

We are looking for a developer with strong experience in Rust and Python.
The project is already live: the core is written in Rust, while integrations and business logic are implemented in Python.

Responsibilities:

• Maintain and further develop an existing project (Rust + Python).
  
   
• Optimize performance and fix bugs.
  
   
• Participate in fast release cycles and bug-fixing processes.
  
   

Requirements:

• Strong Python skills (3.8+), preferably with experience in data/web libraries.
  
   
• Experience with Rust or willingness to quickly dive into it.
  
   
• Confident JavaScript knowledge.
  
   
• Experience working with data: AI / data analysis, CSV, Excel, Google Sheets.
  
   
• Understanding of multithreading, API integrations, and system-level tools.
  
   
• Ability to quickly navigate an existing codebase and solve tasks independently.
  
   

Nice to have:

• Experience with CI/CD, Docker, GitHub Actions.
  
   
• Knowledge of code security practices and secret rotation.
  
   
• Familiarity with data / fintech ecosystems (Pandas, Polars, etc.).