PostgreSQL Developers Hiring Guide

An advanced, open-source database, popular for compatibility.

PostgreSQL is a prominent open-source relational database management system. It’s written in C and can perform validation, storage, and retrieval of data through SQL queries. 

It primarily uses SQL but can also use non-querying languages such as JSON. It’s compatible with all major programming languages, including Python, Java, C#, C/C+, Ruby, and JavaScript (Node.js). It can be used as a data warehouse, as many tools use PostgreSQL for data mining and analytics.  

One of the major advantages of PostgreSQL is its Geospatial data handling and support. PostgreSQL, along with PostGIS extension, can be used for organizing geospatial data and running location queries. It also supports GIS agencies to build secure mapping applications and programs.

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The PostgreSQL system works on client-server architecture and is compliant with all major OS and firmware. In addition, it’s ACID-compliant and has various features like multi-version concurrency and nested transactions.

It uses SSL encryption to protect the data traffic between ports. Row-level security allows admins to set the access setting for different users. LDAP server validates entries and provides role-based control to users. TLS is used for securing data over the network, which comes with complex encryption to secure data.

PostgreSQL provides users with trigger-based, asynchronous, and synchronous replication of data for backup and protection. It also has fault tolerance, physical and log-based partial replication, Point in Time recovery, and online/hot backups.


How relevant is PostgreSQL in today’s market

PostgreSQL is a pretty sophisticated and easy-to-use database. This database was released on 8 July 1996 by PostgreSQL Global Development Group. This stack overflow survey states that PostgreSQL is the second most popular database in the world.

One of the main reasons behind the popularity of PostgreSQL is that it provides a convenient and affordable database set up for medium-scale startups and organizations. However, well-known companies such as Groupon, Apple, and Fujitsu also use PostgreSQL.

It has many different uses. Financial firms also use PostgreSQL for online transaction processing and analytics. Supply chain companies use PostgreSQL for the storage backend. It also protects data from failover, repetitiveness, and manual negligence. 

PostgreSQL is open source, many companies use it for websites that require scalability without additional costs. It can work with different frameworks (Django, Hibernate, PHP, and others) and can also be used in research and scientific exploration.


Issues companies face while hiring a PostgreSQL developer

There can be various challenges that can arise while hiring a PostgreSQL developer. For example, the developer might be proficient in application development, but they may not have experience understanding or handling business requirements. Or they may not have experience in scaling the database or handling memory issues. 

Sometimes, developers don't know how to deal with the challenges of the PostgreSQL database system - they only know application integration. Using PostgreSQL requires extensive expertise and research. Only experienced developers and DB admin should be allowed to handle your database.


How to choose the best PostgreSQL developer?

Hiring a perfect PostgreSQL developer might seem a difficult task, but there are certain steps you can take. You can check the developer's knowledge of the flexible multimodel architecture of PostgreSQL. An ideal PostgreSQL developer should also know about DevOps and agile practices. 

They should have a good knowledge of SQL and should be able to use efficient database coding practices. PostgreSQL developers also may have to work on Geospatial data for GIS or with polyglot persistence databases. They should be knowledgeable about that while being able to maintain integrity and quality of content.    


Conclusion

PostgreSQL is undoubtedly one of the best database systems available in the market. It manages data efficiently and allows for maximum scalability and precision. PostgreSQL has relational (SQL) and non-relational (JSON) querying ability and is cross-platform. 

It can support dynamic websites and is compatible with all major languages and middleware. It protects data integrity and is fault-tolerant which makes it one of the most reliable and architecturally powerful database systems. 

What are the main differences between SQL Server and PostgreSQL?

SQL Server is a simple DBMS, whereas PostgreSQL is an advanced database. SQL Server can copy all sorts of data. PostgreSQL, however, only allows replication only in the report format. 

However, the SQL server doesn’t have options for dynamic actions, triggers or advanced compute columns, whereas PostgreSQL provides these features. Also, PostgreSQL is cross-platform, while SQLserver isn’t. 


What are the various data types in PostgreSQL?

PostgreSQL supports numerous data types such as Boolean, characters (char, text, varchar), numeric (int, float), temporal (date, time), array, UUID, and unique data types like geometric data and network address.


What’s multi-version concurrency control in PostgreSQL?

MVCC or multi-version concurrency control is an advanced PostgreSQL feature. It minimizes the useless locking of the database by allowing the transaction to work on the database as it was a few seconds ago. This prevents the transaction from viewing inconsistent data. 

This feature helps data analysts and developers, especially those working as a group. It allows easy, seamless access to the database without the fear of accessing incorrect information. 


What are PostgreSQL functions?

PostgreSQL functions are stored protocols that you can use to perform operations and tasks in a database. Thus, a function is a set of SQL and procedural commands that may have loops, assignments, and flow-of-control. These functions are stored on the database server and are invoked using the SQL interface. Functions can be query language functions, procedural functions, and internal functions. 


What are tokens in PostgreSQL?

Tokens are the fundamental building blocks in PostgreSQL. They can be of different types: constants, keywords, and quoted identifiers, among others. These are separated by whitespaces. Comments aren’t included in tokens, and the commands to invoke different tokens are decided on a case-by-case basis. 

We are looking for a smart and adaptable PostgreSQL developer to join our team. They should be team players who are passionate about software development, database handling, and maintenance. It’s an excellent opportunity for result-oriented developers who want to create excellent APIs, learn skills, and take on different responsibilities.


Responsibilities

  • Create, test, and execute highly-optimized SQL code. 
  • Implement and maintain SQL code through stored procedures, scripts, and triggers. 
  • Research and perform complex tasks and requests in a fast-paced environment.
  • Ensure Reliability, Security, and Performance. 
  • Coordinate with product managers, DBA’s, GIS analysts, and stakeholders to understand business requirements. 
  • Work on documentation and participate in Agile meetings.
  • Follow best industry practices and standards

Skills and Qualifications

  • Working Knowledge of PostgreSQL, SQL, triggers, procedures. 
  • Experience in efficient and readable code without compromising data quality and security. 
  • Proven experience with load testing, partitioning, connecting, and profiling databases.
  • Experience with DOM manipulation and handling complicated SQL statements. 
  • Knowledge of JSON and server management. 
  • Knowledge of database design principles, index management, integrity check.  
  • Problem-solving skills and team spirit. 

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