Data / Operations / Product

Tanja Adzic

I turn complex work into clear systems, reliable data and useful digital products.

My background spans customer support, operations, data analysis and product development. The connecting thread is practical problem-solving: understanding how work really happens and building a better way to do it.

View portfolio Professional background
01Data systems

Cleaning, modelling and making complex information trustworthy.

02Operations

Turning real workflows into clear, maintainable processes.

03Customer experience

Solving problems with context, patience and technical clarity.

04Product development

Moving from requirements and architecture to a working application.

Professional background

Work across people,
data and systems.

Aug 2026 - Present

Corex / CircuitMess

Customer Support Specialist

Customer support for CircuitMess, a company that makes STEM toys.

  • Guide customers through product selection, setup, assembly and everyday use.
  • Troubleshoot hardware, software and connectivity questions in clear, accessible language.
  • Support order, delivery, return and warranty-related requests.
  • Document recurring issues, escalate technical cases and share customer feedback with the wider team.
Feb 2026 - Present

Singularitet Mental Health Center

Data Systems & Product Developer / Independent Contractor

Rebuilding the center's operational data foundation and developing a secure practice-management application.

  • Reconstruct and reconcile years of client, session, calendar and financial records.
  • Design canonical data models, validation rules and privacy-aware workflows.
  • Map the complete practice journey, including scheduling, client status, payments and reporting.
  • Lead product requirements, architecture, prototyping, testing and staged application development.
Jul 2024 - Aug 2026

TaskUs, Serbia

Partner Support / Customer Care Representative

Delivered multichannel support across chat, WhatsApp, email and phone for booking, platform and partner-related issues.

  • Resolved customer and partner questions while following service, quality and escalation procedures.
  • Maintained accurate case records and coordinated with internal teams on complex issues.
Jun 2022 - Jun 2024

Singularitet Mental Health Center

Data Specialist & Analyst

Digitised and standardised business records, maintained data quality, tracked schedules, payments and KPIs, and improved administrative processes through reporting and automation.

Earlier experience

2015 - 2018

Co-Founder, Operations & Data Administration

Fabrika Social Accelerator and Coworking

2014 - 2021

Business English Teacher

Professional communication, coaching and tailored learning

Portfolio

Selected projects

Data analysis, operational systems and end-to-end product work. Each project shows the problem, the decisions behind the work and what the result makes possible.

Current projectProduct / Data / Operations

Psychotherapy Practice Operations Platform

One secure application for client records, sessions, scheduling, finances and operational reporting.

ProblemFragmented historical data and workflows across separate tools.
My roleResearch, data architecture, privacy, UX and application development.
Current stageData reconstruction, workflow specification and functional prototype.
In development
Operations analyticsKPI / Root cause

Operational KPI Performance Investigation

Tracing a performance drop across demand, capacity and service-quality signals, then translating findings into practical interventions.

Read case study
Marketing analyticsExcel / KPIs

Email Campaign Performance Analysis

Connecting delivery, engagement, conversion and revenue metrics to identify where campaigns gain or lose momentum.

Read case study
Predictive analyticsPython / XGBoost

Customer Targeting with Predictive Analytics

Turning an imbalanced classification problem into a ranked, business-ready list for targeted customer outreach.

Read case study
Original heatmap of Instacart order frequency by day and hour
Customer analyticsExploration / Recommendation

Instacart Behaviour & Item Recommendation

Analysing shopping patterns, reorder behaviour and timing signals to support meaningful product recommendations.

Explore project

More case studies

Healthcare Data Migration & ValidationData quality / Privacy / Operations ↗ Data Science POC for Digital MarketingProduct roadmap / Applied data science ↗

Selected writing

Technical ideas,
explained clearly.

Three pinned articles from my Medium publication, covering data collection, data infrastructure and application deployment.

01

18 min read · Dec 2023

A Web Scraping Project using Scrapy

Scrapy spiders, selectors, pagination, item pipelines and responsible data collection.
Read on Medium ↗
02

Data engineering · Jan 2024

ETL and Data Pipelines using Airflow and Kafka

Pipeline architecture, batch and streaming workflows, orchestration and monitoring.
Read on Medium ↗
03

6 min read · Feb 2023

Deploying a Streamlit App using Docker, AWS ECR and EC2

From a local application to a containerized cloud deployment on AWS.
Read on Medium ↗

About

I am most useful where the problem does not fit neatly into one job title.

I combine analytical work with operational experience and a strong understanding of users. I can move from a messy spreadsheet or customer issue to a data model, workflow, product requirement or practical solution.

My work is grounded in curiosity, accuracy and responsibility. I care about the details because the systems I build affect real decisions and real people.

Contact

Have a complex problem
that needs structure?

Start a conversation GitHub Medium