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Data QA Developer with Python Salary in 2024

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Total:
36
Median Salary Expectations:
$4,752
Proposals:
1

How statistics are calculated

We count how many offers each candidate received and for what salary. For example, if a Data QA developer with Python with a salary of $4,500 received 10 offers, then we would count him 10 times. If there were no offers, then he would not get into the statistics either.

The graph column is the total number of offers. This is not the number of vacancies, but an indicator of the level of demand. The more offers there are, the more companies try to hire such a specialist. 5k+ includes candidates with salaries >= $5,000 and < $5,500.

Median Salary Expectation – the weighted average of the market offer in the selected specialization, that is, the most frequent job offers for the selected specialization received by candidates. We do not count accepted or rejected offers.

Data QA

What is Data Quality

A data quality analyst maintains an organisation’s data so that they can have confidence in the accuracy, completeness, consistency, trustworthiness, and availability of their data. DQA teams are in charge of conducting audits, defining the data quality standards, spotting outliers, and fixing the flaws, and play a key role at all stages in the data lifecycle. Without DQA work, strategic plans will fail, operations will go awry, customers will leave, and organisations will face substantial financial losses, as well as a lack of customer trust and potential legal repercussions due to poor-quality data.

This is a job that has changed as much as the hidden infrastructure that transforms data into insight and then powers the apps that we all use. I mean, it’s changed a lot.

Data Correctness/Validation

This is the largest stream of all the tasks. When we talk about data correctness, we should be asking: what does correctness mean to you, for this dataset? Because it would be different for every dataset and every organisation. The commonsense interpretation is that it must be what your end user (or business) wants from the dataset. Or what would be an expected result of the dataset.

We can obtain this just by asking questions, or else reading through the list of requirements. Here are some of the tests we might run, in this stream:

Finding Duplicates — nobody wants this in their data.

– Your data contains unique/distinct values in that column/field. Will the returned value be a unique/distinct value in that column/field?

– Any value that can be found in your data is returned.

Data with KPIs – If data has any columns we can sum, min or max on it’s called a key performance indicator. So basically any models which are mostly numeric/int column. eg: Budget, Revenue, Sales etc. If there is data comparison between two datasets then below tests applies:

– Comparing counts between two datasets — get the difference in count

– Compare the unique/distinct values and counts for columns – find out which values are not present in either of the datasets.

– Compare the KPIs between two datasets and get the percentage difference between them.

– Replace missing values – missing in any one of the datasets with primary or composite primary key. This can be done in a data source that does not have primary key too.

– Perform the metrics by segment for the individual column value — that can help you determine what might be going wrong if the count of values in the Zoopla-side doesn’t match the count on the Rightmove-side or if some of the values are missing. 

Data Freshness

This is an easy set. How do we know if the data is fresh?

An obvious indication here is to check if your dataset has a date column, in which case, you just check the max date. Another one is, when the data was pulled into a particular table, all of this can be converted into a very simple automated checks, which we might talk about in a later blog entry. 

Data Completeness

This could be an intermediate step in addition to data correctness, but how do we know to get there if the space of answers is complete?

To do this test, check if any column has all values null in it ­ perhaps that’s okay, but most of the time it’s bad news.

Another test would be one-valuedness: whether everywhere on the column all values are the same, probably in some cases that would be a fine result, but probably in other cases that would be something we’d rather look into.

What are Data Quality Tools and How are They Used?

Data quality tools are used to improve, or sometimes automate, many processes required to ensure that data stays fit for analytics, data science, and machine learning. For example, such tools enable teams to evaluate their existing data pipelines, identify bottlenecks in quality, and even automate many remediation steps. Examples of activities relating to guaranteeing data quality include data profiling, data lineage, and data cleansing. Data cleansing, data profiling, measurement, and visualization tools can be used by teams to ‘understand the shape and values of the data assets that have been acquired – and how they are being collected’. These tools will call outliers and mixed formats. In the data analytics pipeline, data profiling acts as a quality control gate. And each of these are data management chores.

Where is Python used?

Web Crawling Shenanigans

    • Python slinks through websites like a ninja, snatching data and whispering '404 error' as a joke when pages evade capture.

AI's Kitchen

    • Python stirs the AI pot, tossing in a pinch of algorithms and a dollop of data to cook up some truly mind-nibbling intelligence.

Game of Codes



    • In the realm of game development, Python plays the jester, not the king, but it still juggles codes and enchants indie developers.



Astronomy's Telescope Lens Polisher



    • Python keeps its head among the stars, polishing data from the cosmos and helping boffins unlock the universe's cheat codes.


Python Alternatives

 

Java

 

Object-oriented programming language used for enterprise applications, mobile apps, and large systems development.

 

Example: Android app development

 


// Python code
def greet(name):
return "Hello, " + name + "!"

# Java equivalent
public class HelloWorld {
public static String greet(String name) {
return "Hello, " + name + "!";
}
}




    • Runs on billions of devices worldwide.
    • Static typing can lead to fewer runtime errors.
    • Comes with a rich set of APIs and a vibrant ecosystem.
    • Verbose syntax compared to Python.
    • Slower development time due to explicit compilation.
    • Can be more challenging for beginners.




JavaScript

 

The scripting language primarily for the web, used in front-end development and increasingly in back-end with Node.js.

 

Example: Interactive websites, server applications

 


// Python code
def add(x, y):
return x + y

# JavaScript equivalent
function add(x, y) {
return x + y;
}




    • Essential for client-side web development.
    • Highly versatile with frameworks like React, Angular, and Vue.
    • Event-driven non-blocking I/O with Node.js.
    • Dynamic typing can lead to runtime errors.
    • Asynchronous programming can be complex.
    • Fragmented ecosystem due to rapid evolution.




Go (Golang)

 

A statically-typed language designed at Google, known for its simplicity and high performance in concurrent operations.

 

Example: Cloud services, distributed networks

 


// Python code
def add(x, y):
return x + y

# Go equivalent
func add(x int, y int) int {
return x + y
}




    • Optimized for multi-core processors with built-in concurrency.
    • Statically-typed with a clean and readable syntax.
    • Efficient execution and a strong standard library.
    • Limited third-party libraries compared to Python.
    • Interface-based type system can be tricky.
    • Less versatile for certain applications.

 

Quick Facts about Python

 

Monty Python's Love Child

 

Let's kick things off with a chuckle: Python, a coding language that's as much about fun as function, was born in the late '80s thanks to a chap named Guido van Rossum. He was on a quest to combat the drudgery of the season (think Christmas with no presents) and ended up crafting this nifty script-slinger in 1989. But here's the twist—it's named after the British comedy troupe Monty Python. So remember, always expect the Spanish Inquisition when you're debugging!



The Zen of Python

 

If Python was a dude, it'd be the 'chill' one at the party. It's got this mantra—The Zen of Python—which is basically the 'Hakuna Matata' for coders. It whispers sweet nothings like "beautiful is better than ugly" and "simple is better than complex." Want a piece of that Zen? Just type

import this

into your Python console and get ready for some programming enlightenment.



Release the Pythons!

 

Eyebrows hit the ceiling in 2008 when Python 3 sauntered into the scene. Codenamed "Python 3000" or the cooler-sounding "Py3k", this bad boy was no mere update—it was like Python had drunk a whole new type of coffee. It had impressive new features, but also broke backwards compatibility, meaning code written in Python 2 needed to shape up or ship out. It sparked a love-hate relationship that has kept forums buzzing and devs chugging energy drinks into the wee hours.

What is the difference between Junior, Middle, Senior and Expert Python developer?



Seniority NameYears of ExperienceAverage Salary (USD/year)Responsibilities & Activities
Junior0-2$50,000 - $70,000

    • Writing simple scripts and automation tasks

    • Debugging and fixing minor bugs

    • Learning codebase and contributing to documentation

    • Assisting in code reviews with supervision


Middle2-5$70,000 - $95,000

    • Developing features with moderate guidance

    • Improvement and refactoring of code

    • Writing unit and integration tests

    • Participating in code reviews


Senior5+$95,000 - $120,000

    • Architecting and designing complex systems

    • Mentoring junior and middle developers

    • Leading technical discussions and making decisions

    • Optimizing performance and ensuring code quality


Expert/Team Lead8+$120,000+

    • Setting technical direction and strategy for teams

    • Coordinating with stakeholders on product vision

    • Overseeing project management and delivery

    • Handling complex project negotiations and risks


 

Top 10 Python Related Tech



    • Python


      Python slithers its way to the top of the list, being the charming and easy-to-read language that woos developers of all levels. Renowned for its clean syntax and powerful libraries, it's like the Swiss Army knife in a techie's toolkit. It's the VIP pass to a plethora of frameworks, tools, and libraries. Python's versatile nature lets it code everything from a tiny script to a full-fledged spaceship (okay, maybe not a spaceship).


      def greet(world):
      print(f"Hello, {world}!")
      greet("Developers")

 

    • Django


      Picture Django as the cool kid on the block that lets you whip up web applications without breaking a sweat. This high-level Python web framework follows the "batteries-included" philosophy, which means it gives you everything and the kitchen sink to avoid the dreaded "NotImplementedYet" blues.


      from django.http import HttpResponse

      def hello(request):
      return HttpResponse("Look ma! I built a web app with Django!")

 

    • Flask


      Flask is your minimalist buddy in the Python web framework world, who is a fan of simplicity and elegance. If Django is a Swiss Army knife, Flask is your trusty scalpel — precise and perfect for smaller incisions into the web dev body. It gives you the foundation to build basic web services quicker than you can say "micro-framework."


      from flask import Flask
      app = Flask(__name__)

      @app.route("/")
      def home():
      return "Flask makes web dev fun!"

 

    • NumPy


      NumPy is like the gym for Python where data goes to get buff. It's all about handling those heavy-lifting numerical operations with its powerful array objects. Data scientists and engineers flex their coding muscles with NumPy to crunch numbers faster than a calculator on a sugar rush.


      import numpy as np

      a = np.array([1, 2, 3])
      print(f"NumPy says hi: {a}")

 

    • Pandas


      Pandas is not your everyday black and white bear. In the Python jungle, it's the go-to data manipulation expert, ideal for munging and messing around with data frames. Its ability to devour messy data and spit out clean results is legendary among data wranglers and analysts.


      import pandas as pd

      df = pd.DataFrame({'A': [1, 2, 3]})
      print("Pandas and chill: ")
      print(df)

 

    • Git


      Git is the timeless classic of version control systems. It's like that trusty old spellbook for developers, keeping all versions of their magical codes safe and sound. The incantation "git commit" is often followed by a sigh of relief, knowing that changes are tucked away in their repository repository, safe from accidental catastrophes.

 

    • Docker


      Docker is the sorcerer's stone of consistent software deployment — converting applications to portable, containerized spells that can run almost anywhere. With Docker, you can stop saying, "But it works on my machine!" and start shipping apps in their cozy little environments.

 

    • PostgreSQL


      PostgreSQL, affectionately called Postgres, is the database giant that won't give you a "sql-ache". It's an open-source relational database that juggles SQL compliance with, throwing in enough advanced features that you'd think it’s doing data magic.

 

    • Redis


      Redis is like that flash memory card that surprises you with its speed every time. It's an in-memory data structure store, used as a database, cache, and message broker. It’s like giving your data a triple espresso shot, so your app's data-fetching game is always on point.

    • AWS


      AWS, or Amazon Web Services, is the colossal cloud playground where developers deploy their apps without ever worrying about running out of sandbox space. It's a haven of scalable resources, with enough services to make any developer feel like a kid in a candy store, or rather, a techie in a tech store.

 

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