CRM development covers a wide range of work — building a custom CRM from scratch, customizing a commercial platform like Salesforce or HubSpot, integrating a CRM with other business systems, or migrating data from one CRM to another. The skills required for each of these are meaningfully different, and hiring the wrong type of CRM developer for your specific need is a common and expensive mistake.
This guide covers how to hire a CRM developer for each of these use cases, what skills and experience actually matter, the questions that will tell you whether a candidate can actually do the work, and the red flags that should make you walk away.
01 First: What Type of CRM Work Do You Actually Need?
Custom CRM development from scratch requires a full-stack developer with strong backend skills, database design experience, and ideally experience building B2B software. The CRM domain knowledge matters less than the engineering fundamentals.
Salesforce development requires specific platform knowledge — Apex programming language, SOQL for database queries, Lightning Web Components for UI, and Salesforce's security model. This is a distinct technical skill set. A great general developer cannot just pick up Salesforce development without real platform experience.
HubSpot development and integration requires familiarity with HubSpot's CRM APIs, workflow automation, custom properties, and the HubSpot CMS if you are building on HubSpot's website platform. It is a less specialized skill set than Salesforce but still has platform-specific knowledge requirements.
CRM integration work — connecting your CRM to your website, marketing tools, support platform, or ERP — requires strong API integration experience and deep familiarity with the specific platforms being connected.
02 Skills to Look for by CRM Work Type
For Custom CRM Development
Look for backend development experience with complex relational data models, understanding of how CRM data structures work (contacts, accounts, deals, activities and their relationships), experience building multi-user applications with role-based permissions, and ideally prior CRM-adjacent experience — sales tools, marketing automation, or similar domains.
For Salesforce Development
Salesforce certifications signal foundational knowledge, but experience matters more. Ask for specifics: what custom objects have they built, what Apex triggers have they written, what Lightning Web Components have they developed? Salesforce-specific interview questions about governor limits, trigger context variables, and bulkification patterns will quickly distinguish experienced Salesforce developers from those who have taken the certification without real project experience.
For HubSpot Development
HubSpot CRM API familiarity, experience with HubSpot's workflow automation and custom properties, and knowledge of HubSpot's association model for linking objects are the key technical requirements. Ask for examples of HubSpot integrations they have built and what the specific business problem was.
03 Interview Questions That Reveal Real Ability
For custom CRM development: Walk me through how you would design the data model for a B2B CRM that needs to support contacts, accounts, deals, activities, and custom fields. This question reveals both database design skill and domain understanding.
For any CRM integration work: How would you handle a situation where data in two systems gets out of sync? What is your approach to bidirectional sync, and how do you resolve conflicts when the same record is updated in both systems before the sync runs?
For any CRM work: What do you think the most common reasons are for CRM implementations failing, and how do you design to avoid them?