Hire the Top 3% of Freelance PostgreSQL Developers
Toptal is a marketplace for top PostgreSQL developers, engineers, programmers, coders, architects, and consultants. Top companies and startups choose Toptal PostgreSQL freelancers for their mission-critical software projects.
Donald has a wealth of experience—ten plus years with Oracle Database, five years with PostgreSQL, SQL and other databases, and five years with Python development. Recently, he’s been working with Django, Linux Shell, JavaScript, HTML, among others. Environment-wise, Donald has worked with global, multicultural development teams, has AWS and GCP experience, and is equally comfortable with agile and waterfall methodologies.
Abraham's been working with databases since 1984, including Oracle, PostgreSQL, MS Access, MySQL, and more in Unix, Windows, and AWS (cloud) environments. His work experience runs the gamut from data analysis, modeling, migration, conversion, integration, aggregation, mining, optimization, performance tuning, warehousing to extensive, varied, and detailed reporting.
Ryder has 20 years experience building and maintaining large-scale transaction processing platforms (built on Linux, PostgreSQL, Python, and C++), in which performance, reliability, and uptime are equally critical. He has co-founded and architected platforms for three technology companies over his career and is comfortable filling many technical roles in small teams and large teams alike. He communicates well and is meticulous in all his work.
Vicki is a highly skilled full-stack software engineer with six years of experience designing, developing, and delivering innovative web apps. She is proficient in JavaScript and TypeScript and has extensive knowledge of React, Node.js, PostgreSQL, TypeORM, and Docker. She is committed to continuous learning, mentorship, and collaborating with cross-functional teams to achieve project success. Vicki has a good track record of owning projects and consistently delivered outstanding results.
Philip is an experienced database engineer and administrator (DBA) with over 20 years of experience. His primary focus is PostgreSQL, but he has worked with several other databases, including Oracle and the AWS suite. He has worked on every aspect of the database lifecycle, from designing and building greenfield projects to maintaining and tuning high throughput 24/7 systems and everything in between, including complex data migration projects.
László is a software engineer with two decades of experience. His primary areas of expertise are relational database and data-warehouse design, development and performance optimization with Oracle Database, Microsoft SQL Server, MySQL, PostgreSQL as well as distributed RDBMS as Greenplum. László's secondary areas of interest are back-end development using PHP, C++, .NET.
Sandra brings 20+ years of experience in the development of competitive location and business intelligent systems enabling market opportunity analysis, high-level roll-out strategy, workforce management, operational reporting, and KPIs tracking. She successfully integrates data from companies OSS/BSS, mobile apps, DWH, machine learning models, and external services for the purpose of reporting and data visualization. She has eight years of management experience and is a certified Scrum Master.
Ivan is a senior database and network administrator whose expertise includes software development, Elasticsearch, cloud servers (Digital Ocean, Google Cloud, AWS), and development in Java and Linux. He has designed and administrated a PostgreSQL database that handles millions of requests a day, developed PL/pgSQL procedures for high-performance data manipulation, and configured Elasticsearch clusters for vast amounts of data.
Andrei has more than 14 years of professional experience in database design. He began working in Oracle and later migrated to PostgreSQL. He uses Python and Bash to write scripts and back-end services and GNU/Linux as an operating system for business and personal purposes. When designing databases, Andrei sees the big picture and he pays close attention to small details.
Johan is a developer with 18 years of professional experience—his key technologies are Python, JavaScript, Flask, GTK/GNOME, PostgreSQL, Jenkins, and Gerrit. Johan has been contributing to open-source communities for many years, including maintaining the key technologies used in the GNOME desktop environment.
Berenice is a senior database engineer with solid experience working with relational and non-relational databases on-premises and in different clouds. She excels in managing massive data sets with various tools and dealing with performance issues. As a database expert, Berenice enjoys migrating it to the cloud and creating models and ETL in data warehousing.
PostgreSQL developers are skilled in creating systems for gathering, processing, and storing data. This guide to hiring PostgreSQL developers features interview questions and answers, as well as best practices that will help you identify the best candidates for your company.
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How to Hire PostgreSQL Developers Through Toptal
1
Talk to One of Our Industry Experts
A Toptal director of engineering will work with you to understand your goals, technical needs, and team dynamics.
2
Work With Hand-Selected Talent
Within days, we'll introduce you to the right PostgreSQL developer for your project. Average time to match is under 24 hours.
3
The Right Fit, Guaranteed
Work with your new PostgreSQL developer for a trial period (pay only if satisfied), ensuring they're the right fit before starting the engagement.
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Access a vast pool of skilled developers in our talent network and hire the top 3% within just 48 hours.
How much does it cost to hire a PostgreSQL developer?
The cost associated with hiring a PostgreSQL developer depends on various factors, including preferred talent location, complexity and size of the project you’re hiring for, seniority, engagement commitment (hourly, part-time, or full-time), and more. In the US, for example, Glassdoor’s reported average total annual pay for PostgreSQL developers is $111,830 as of May 4, 2023. With Toptal, you can speak with an expert talent matcher who will help you understand the cost of talent with the right skills and seniority level for your needs. To get started, schedule a call with us — it’s free, and there’s no obligation to hire with Toptal.
How do I hire a PostgreSQL developer?
To hire the right PostgreSQL developer, it’s important to evaluate a candidate’s experience, technical skills, and communication skills. You’ll also want to consider the fit with your particular industry, company, and project. Toptal’s rigorous screening process ensures that every member of our network has excellent experience and skills, and our team will match you with the perfect PostgreSQL developers for your project.
Are PostgreSQL developers in demand?
Yes, PostgreSQL developers are in high demand. According to Gartner, the DBMS market has seen consistent growth (it approached $80 billion in 2021) that continues to accelerate. PostgreSQL is a top choice for database management (and the preferred database technology among professional developers). It is a versatile tool with advanced features and it supports relational databases while also offering NoSQL functionality. The need for PostgreSQL engineers continues to increase.
How should I choose the best PostgreSQL developers for my project?
The best PostgreSQL developers for your project should have a foundation in relational databases and SQL expertise. They should have prior PostgreSQL experience and understand its features as they relate to data, performance, and reliability. Developers should also possess certain complementary skills: proficiency with a procedural language (e.g., PL/pgSQL or PL/Python), familiarity with PostgreSQL’s specific JSON operators and functions (if NoSQL functionalities are required), and mastery of C-family languages (in cases where in-house PostgreSQL extensions need creation or maintenance). Finally, it’s crucial for every engineer to have debugging and problem-solving abilities.
How quickly can you hire with Toptal?
Typically, you can hire a PostgreSQL developer with Toptal in about 48 hours. For larger teams of talent or Managed Delivery, timelines may vary. Our talent matchers are highly skilled in the same fields they’re matching in—they’re not recruiters or HR reps. They’ll work with you to understand your goals, technical needs, and team dynamics, and match you with ideal candidates from our vetted global talent network.
Once you select your PostgreSQL developer, you’ll have a no-risk trial period to ensure they’re the perfect fit. Our matching process has a 98% trial-to-hire rate, so you can rest assured that you’re getting the best fit every time.
Is PostgreSQL a good option for my project?
PostgreSQL is an open-source relational database that is currently the most popular of its kind. It offers many relevant extensions to the relational model, such as PostGIS geospatial support, ACID compliance, easy implementation of custom datatypes, custom functions, and the use of different programming languages without recompiling the engine. PostgreSQL is a very powerful database engine for a vast number of use cases. Extremely efficient and secure, with huge adoption, PostgreSQL is a solid choice when it comes to open-source databases for now and the foreseeable future.
How are Toptal PostgreSQL developers different?
At Toptal, we thoroughly screen our PostgreSQL developers to ensure we only match you with the highest caliber of talent. Of the more than 200,000 people who apply to join the Toptal network each year, fewer than 3% make the cut.
In addition to screening for industry-leading expertise, we also assess candidates’ language and interpersonal skills to ensure that you have a smooth working relationship.
When you hire with Toptal, you’ll always work with world-class, custom-matched PostgreSQL developers ready to help you achieve your goals.
Can you hire PostgreSQL developers on an hourly basis or for project-based tasks?
You can hire PostgreSQL developers on an hourly, part-time, or full-time basis. Toptal can also manage the entire project from end-to-end with our Managed Delivery offering. Whether you hire an expert for a full- or part-time position, you’ll have the control and flexibility to scale your team up or down as your needs evolve. Our PostgreSQL developers can fully integrate into your existing team for a seamless working experience.
What is the no-risk trial period for Toptal PostgreSQL developers?
We make sure that each engagement between you and your PostgreSQL developer begins with a trial period of up to two weeks. This means that you have time to confirm the engagement will be successful. If you’re completely satisfied with the results, we’ll bill you for the time and continue the engagement for as long as you’d like. If you’re not completely satisfied, you won’t be billed. From there, we can either part ways, or we can provide you with another expert who may be a better fit and with whom we will begin a second, no-risk trial.
Jano is a full-stack developer and founder specializing in databases. Using PostgreSQL, he has worked on database services with government data, recommendation engines, and performance optimization projects, and has experience with startups, consulting, and leading small teams. He has a master’s (summa cum laude) in software engineering from the Slovak University of Technology in Bratislava.
The database management systems (DBMS) market is booming—it approached $80 billion in 2021, following a trend of consistent growth over the five preceding years. PostgreSQL, also known as Postgres, is a top choice for database management and is the preferred database technology among professional developers. As the DBMS market expands, the need for PostgreSQL engineers continues to increase.
Hiring PostgreSQL developers is not always straightforward: While other SQL engineers do have some skill overlap with PostgreSQL developers, only experienced PostgreSQL specialists know how to leverage PostgreSQL’s advanced features and how to be effective at performance tuning.
In this hiring guide, we outline the critical components of a PostgreSQL job description, interview questions, and assessments. We also define the difference between PostgreSQL and SQL developers from a hiring perspective and the complementary technical skills your role might require.
What attributes distinguish quality PostgreSQL Developers from others?
When looking to hire a PostgreSQL developer, it’s important to understand how PostgreSQL developers stand out in a broader context of database expertise (i.e., PostgreSQL versus SQL versus NoSQL skills). There are two basic types of databases:
Relational (RDBMS) or SQL databases use tables with rows and columns, which is ideal for structured data; these databases facilitate complex queries and help developers enforce data consistency. Examples include PostgreSQL, MySQL, and Microsoft (MS) SQL Server.
With all of them, developers use Structured Query Language (SQL) to create and find data—but PostgreSQL extends the language with advanced features and customizations.
Nonrelational or NoSQL databases use ad hoc, JSON-formatted “documents,” allowing for maximum flexibility amid changing requirements.
While most candidates should be savvy with relational databases, the best PostgreSQL developers will also identify which advanced PostgreSQL features are a good fit for your assignment.
You should require a high-level understanding of standard features and functionalities, such as:
Data
Foreign keys; stored procedures; support for a variety of data types
Performance
Multiversion concurrency control (MVCC) and locking mechanisms; nested transactions; advanced query planner and optimizer
Secure access-control system; international character sets; support for a variety of languages; time stamps with time zones
To gauge a candidate’s depth of knowledge, ask them about specific PostgreSQL abilities and limitations, using its feature matrix for reference.
How can you identify the ideal PostgreSQL Developer for you?
Unless you are hiring junior-level engineers and have the flexibility for additional onboarding and training time, you should focus your efforts on finding developers with significant hands-on experience with PostgreSQL. When reviewing résumés, be wary of candidates who list only experience with SQL: SQL generalists will likely need to unlearn some habits specific to other SQL systems lest they risk implementing antipatterns that may cost your company—even before your app scales.
Ideally, candidates will have plenty of experience with the PostgreSQL subfeatures that are crucial to your project (e.g., JSON datatypes and functions for an app using a hybrid table/document architecture).
The mastery of PostgreSQL requires several complementary skills, but not all of them may be relevant to a given project.
Procedural languages allow PostgreSQL developers to reuse SQL-related code from directly within the database for performance and data consistency. There are four procedural languages in PostgreSQL’s core distribution:
If your project already relies heavily on one or more of these, you may need to hire a developer with Python, Perl, or Tcl skills. However, that list has little to do with how developers interface with PostgreSQL from an app’s code. For example, if your app (or its back end) is written in Java, a Java developer will use PostgreSQL’s client libraries to run queries; a PostgreSQL developer can collaborate with them better if they also know Java, depending on team size and role overlap.
Certain database projects may also benefit from JSON-proficient developers. As mentioned, PostgreSQL is primarily a relational database, but PostgreSQL engineers can still harness the power of NoSQL functionality. Look to hire someone with strong JSON SQL experience and mastery of JSON datatype operators if you are considering a combined document/relational database model.
Finally, in rare cases, familiarity with C-family languages (C or C++) may be needed when hiring developers so they can create and maintain custom PostgreSQL extensions. However, many extensions exist as open-source projects and can be leveraged as is without C or C++ skills.
How to Write a PostgreSQL Job Description for Your Project
The next step in hiring a PostgreSQL developer is to customize role requirements based on your data and specific needs:
Scenario
Level
Requirements
You are just getting started with PostgreSQL and searching for application developers.
Junior- or mid-level engineer
Look for candidates who are generally familiar with SQL. It may not make sense to have a hard requirement on PostgreSQL experience for all engineers, as this could limit your choices. Excellent application developers familiar with any relational database can learn PostgreSQL’s features relatively easily. It is helpful, however, for at least one person on the team to know advanced PostgreSQL features to ease the learning curve for other developers. In particular, a complex new product would benefit from having a PostgreSQL-savvy database architect available to shape the project during its infancy.
You are already using PostgreSQL and hope to enhance your project’s performance.
Senior data engineer
Look for a PostgreSQL database expert with advanced SQL knowledge. Such a specialist can provide you with performance optimization suggestions and monitoring techniques, and guide the team’s best practices. Search for candidates with advanced knowledge of performance tuning and the ability to assess an application’s bottlenecks, as well as leadership experience in coaching more junior engineers on team standards.
Regardless of their level of expertise in PostgreSQL, a solid candidate should have sufficient experience with databases and advanced knowledge of the SQL syntax as a foundation for additional PostgreSQL skills.
What are the most important PostgreSQL interview questions?
Effective interview questions are a critical piece in the hiring puzzle—and your ticket to top developers. You might ask standard SQL interview questions on topics like JOIN clauses and subqueries or more advanced questions on topics like window functions, CTEs, and recursive queries. The best interviews tailor questions based on project-specific factors.
After standard SQL questions, continue with more specific PostgreSQL interview questions, such as:
How would you handle deploying a database model change (e.g., an important column rename) with minimal downtime?
PostgreSQL supports transactional DDL, but even renaming a column can block a full table for reads and writes. This can cause downtime and deadlocks at the database level and may need nontrivial synchronization when deploying new application code that can work with both versions of the table. Splitting a model change into multiple steps that are safe to run at any time is the correct approach. Example action items might include:
Notifying key stakeholders that production deployment may include possible downtime.
Creating a backup copy of the table for later restoration, if required (i.e., when performing structural changes or bulk data updates in an important table).
Running the column rename and subsequent possible data manipulation in the column.
Committing changes (or rolling them back if unexpected issues occur).
Verifying with stakeholders that the application works as expected after finishing deployment.
You should also test each candidate’s understanding of complex PostgreSQL features that are relevant to your project. For example:
When would you consider using a partial index?
Partial indexes are suitable for tables and queries in cases in which you are interested only in a subset of the data. A good example is indexing a status column that filters out most rows. This case might occur in the real world for a table that contains processed and unprocessed job data, where a business is only interested in quickly fetching unprocessed data using the status column.
When would you use table partitioning?
When large amounts of data are stored in databases, performance and scaling suffer. Partitioning helps by dividing big tables into smaller tables, which reduces memory swap problems and table scans. As a result, huge data sets become more accessible and manageable. Most of the operations on unpartitioned tables are applicable to partitioned ones.
Focusing on database administration tasks (e.g., optimization and monitoring) may also be useful when looking to hire seasoned PostgreSQL developers:
What are the key metrics in a PostgreSQL database, and which tools would you use to monitor them?
In terms of query performance, strategic logging is required for any nontrivial application. It is crucial to recognize long-running queries and optimize them (standard approaches include running EXPLAIN ANALYZE and checking query costs). On the application level, it is vital to have visibility into how many queries are issued for a single request to identify N+1 query problems. To handle scaling, it is a best practice to monitor the number of open connections and replication lags.
Services like Datadog and New Relic provide actionable insights regarding PostgreSQL performance and are easy to integrate into existing applications of various languages. pgAdmin is also an excellent open-source graphical tool for database administration; it can monitor database configuration and activity, track sessions and locks, catch long-running queries, and more, but much of this functionality can also be achieved by a PostgreSQL developer skilled with the psql command line.
What would you do if a client’s application (dependent on a database) is stuck and nonresponsive?
Cooperation with other application teams is crucial, as the root cause of the problem may be outside of the database layer (e.g., unresponsive application servers or network firewalls). If all other layers are functional, then engineers should use the performance optimization methods for debugging we’ve laid out here.
Finally, a case study approach may be useful while interviewing. The situation below assesses a candidate’s experience with at least one other relational database (e.g., MySQL, Oracle, MS SQL).
To determine each candidate’s ability to deal with real-world problems, ask them to create a relational database model that meets a set of business requirements that aligns with your project’s use cases.
Based on each candidate’s model, ask them:
How would you query and manipulate data in the database?
What trade-offs did you make in terms of performance, scalability, and maintenance?
How would you run an EXPLAIN on a query? Please include a proposal to optimize the query plan.
All candidates should demonstrate a clear understanding of these relational database concepts.
While interviewing, consider other relevant developer strengths from the complementary technologies mentioned in the “How can you identify the ideal PostgreSQL Developer for you?” section, plus more general engineering topics:
Dockerized and cloud technologies are prevalent in PostgreSQL application architectures. Ask candidates about their experience with cloud database configurations, including experience with dockerized environments (containers) and major cloud providers.
No software engineering interview is complete without situational questions that assess problem-solving and debugging skills. These capabilities are essential for all developers, regardless of their technology or language specialization.
If you need support on high-level performance or architecture decisions, inquire directly about plans to assess your specific problem. Experts working at this level will have strong experience and referrals. They may suggest clear proposals for onboarding clients, defining the project’s next steps, and managing stakeholder expectations.
Why do companies hire PostgreSQL Developers?
PostgreSQL engineers can handle various data sets, whether serving small projects or global enterprises, and PostgreSQL is available for use with major cloud providers like Amazon Web Services, Microsoft Azure, and Google Cloud.
Common real-world use cases for PostgreSQL and other relational databases include transactional applications (e.g., customer relationship management systems) and other scenarios in which data does not change frequently (e.g., storing healthcare data, government data, electricity or mobile plan data, or financial data). An SQL generalist could be all that you need in such cases if there’s already enough PostgreSQL expertise on your team, but you’ll need a PostgreSQL specialist for your app to scale at an enterprise level.
PostgreSQL is an RDBMS first, but PostgreSQL developers can also harness the power of NoSQL functionality and work on projects with unstructured data using a combined document/relational data model. This approach is possible due to PostgreSQL’s rich JSON support, and it requires an engineer who has worked specifically with JSON datatypes in a production system.
While PostgreSQL is a versatile tool, it may not be suitable for every project. For example, other approaches offer better solutions when dealing with huge amounts of unstructured data or blob storage where you don’t need ACID compliance. But you still may benefit from PostgreSQL developers when using other technologies if you are migrating data from PostgreSQL.
As the DBMS market continues to grow, companies will increasingly look to expert PostgreSQL developers to harness the profits of large data sets and stay competitive. With the guidance offered here, you will be better prepared for every step of the hiring journey—from drafting your PostgreSQL job description to identifying the required advanced PostgreSQL skills for development. Zeroing in on the right PostgreSQL experts will drive your data—and your business—toward success.
The technical content presented in this article was reviewed by Tomislav Delas.