Collectly

Senior Software Engineer, Billie AI team

Serbia full-time Senior RSD84,000 - RSD108,000
full-time Senior level Technology & IT Salary listed Curated
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About the role

Key responsibilities

What you'll do

Build and improve AI voice and chat agents that handle thousands of patient conversations every day.

Work on real-time systems where low latency, high concurrency, and reliability are critical.

Develop AI-powered cost estimation algorithms using LLMs and statistical analysis of historical data.

Analyze production data, identify patterns, form hypotheses, test hypotheses, improve accuracy.

Design backend systems that handle high traffic, external integrations, and complex workflows.

Own features end to end. From understanding the business problem to implementation, production monitoring, and measuring results.

Build metrics and dashboards to understand how our products perform and where they need improvement.

Make pragmatic engineering decisions. Know when to move fast and when correctness and reliability cannot be compromised.

Challenge product ideas, propose better solutions, and defend your decisions with data and business reasoning.

Required qualifications

What we're looking for

Strong Python and PostgreSQL experience.

Solid system design skills. Ability to make and explain architectural decisions.

Experience with data analysis, SQL, and building metrics to support decisions.

Experience using AI coding tools in your daily workflow.

Strong product and business thinking -- Ability to understand business requirements, evaluate trade-offs, and make decisions based on customer and business impact.

End-to-end ownership -- Experience taking projects from initial requirements through design, implementation, deployment, and measuring results.

Nice to have

Experience writing and evaluating prompts for production AI systems.

Experience building AI-powered products.

Originally posted on Himalayas

Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Senior
Technology & IT Data Analysis MySQL Python SQL Writing Senior level

Likely questions

  1. Tell us about work you have done that is close to the Senior Software Engineer, Billie AI team role.
  2. How would you approach your first 30 days at Collectly?
  3. Which of Data Analysis, MySQL and Python have you used recently, and what did it help you achieve?
  4. How have you led people, improved a process, or made a hard decision in a previous role?
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with Data Analysis, MySQL and Python.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Senior Software Engineer, Billie AI team role because I can bring practical experience in Data Analysis, MySQL and Python, learn the team quickly, and contribute to the outcomes Collectly needs from this hire.

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