What does an Informix developer do?
An Informix developer builds server-side database logic and client applications for the IBM Informix database server. This role extends core database capabilities by coding stored routines, triggers, and custom DataBlade modules that handle complex data types. The work focuses on optimizing how applications interact with Informix through specific APIs like ESQL/C and JDBC.
- Write and deploy Structured Procedure Language (SPL) routines, including stored procedures and functions, to automate database tasks. Define SQL triggers that execute specific actions when data changes in targeted tables, ensuring consistent data integrity across the system.
- Develop client applications that connect to the Informix server using supported interfaces such as ESQL/C, JDBC, or ODBC drivers. Code efficient data-access layers that query the database and call server-side routines without introducing latency or connection errors.
- Create DataBlade modules to extend the database engine with new data types and specialized routines. Use the DataBlade Developers Kit tools, such as BladeSmith, to build, debug, and integrate these modules so they function seamlessly within the Informix environment.
- Author external-language user-defined routines, often in C, that execute SQL commands via the DataBlade API. Implement these routines to perform high-performance computations or data transformations that standard SQL cannot handle efficiently.
How to hire an Informix developer on Upwork
Step 1: Post a job
Define your database requirements clearly so candidates understand the specific Informix tasks they will handle. The Job Post Generator powered by Uma™, Upwork's Mindful AI helps you draft a precise description in seconds. Describe your needs in a few sentences and Uma drafts a job post for the role. You can write a new post, update a saved draft, or reuse an existing post.
- Specify whether the work involves building SPL routines, creating triggers, or developing client applications using ESQL/C or JDBC.
- List required tools such as the IBM Informix DataBlade Developers Kit if the project requires custom DataBlade modules.
- Clarify if the developer must write external-language user-defined routines in C that execute SQL via the DataBlade API.
Step 2: Evaluate candidates
Look for portfolios that demonstrate direct experience with IBM Informix server-side logic and client connectivity. Uma can run instant video interviews and build shortlists with side-by-side comparisons to help you assess technical fit quickly.
- Check for deployed SPL procedures and functions that handle complex database events and table triggers.
- Verify experience with DataBlade module development using tools like BladeSmith to extend server capabilities.
- Confirm proficiency in connecting applications to Informix databases using supported APIs such as ODBC or JDBC.
Step 3: Interview your top choices
Discuss specific technical challenges related to Informix architecture and data access patterns. Interviews can be scheduled and conducted within Upwork Messages with an immediate transcript and summary after each one.
- Ask how they debug DataBlade modules and ensure SQL execution paths function correctly within C-based UDRs.
- Request examples of client applications they built that query Informix databases using ESQL/C or similar interfaces.
- Explore their approach to designing database behavior using DDL statements and stored routine definitions.
Step 4: Agree on scope and begin work
Set clear milestones for delivering database objects and application components. Use Upwork Messages and the contract workroom for communication and project management, plus identity verification, payment protection, hourly tracking, and project funds for security.
- Define deliverables such as compiled DataBlade modules or tested SPL routines ready for deployment.
- Establish testing criteria for external-language routines to verify they execute SQL without errors.
- Schedule regular check-ins to review progress on client API integration and database object creation.
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