What happens after an enterprise software contract is signed? Beyond selling the product, vendors are increasingly expected to offer each customer post-sales support with integration, configuration, and adoption to help diagnosis problems as they surface.
On enterprise teams, the roles that take on this work are often Customer Success Engineers and Forward Deployment Engineers. While the Customer Success Engineer (CSE) keeps deployed products healthy inside enterprise accounts, the Forward Deployment Engineer (FDE) (also known by titles such as Forward Deployed Engineer, AI Deployment Engineer, or Forward Deployed Software Engineer) builds the custom pieces a customer’s environment demands.
These roles both answer for retention and expansion but differ in their day-to-day tasks, the team they join, and how long each engagement runs. Keep reading below to learn more about the differences between them and when the best time is to hire each:
Enterprise Accounts Raised the Stakes for SaaS
Enterprise sales now account for 60–85% of revenue at modern tech companies, up from a historical 40–70% range. The broader pivot toward enterprise accounts has created growing demand for technical expertise after the sale closes. Enterprise implementations tend to be complex, and the technical work of making them succeed (such as troubleshooting integrations, tuning configurations, and guiding adoption) falls to people with product and engineering depth.
That shift has been visible in Customer Success hiring for years. By 2025, hybrid Customer Success titles that brought engineering knowledge to account work had become more common at AI companies, with experience across cloud infrastructure, containerization, authentication, data platforms, and Python becoming baseline requirements. The CSE role emerged because traditional roles often lacked the technical depth to troubleshoot integration challenges.
Meanwhile, the FDE model has spread across companies of every size as the AI industry has matured. Enterprise org design now gives Customer Success Engineers and Forward Deployed Engineers their own seats beside the Enterprise Account Executive, Sales Engineer, Solutions Architect, and Account Manager.
The Engineer Titles That Work Towards Customer Success
Both CSEs and FDEs serve a specific account management function. While the titling reflects that they are technical support roles, both contribute to go-to-market (GTM) team objectives. The growing need for technical expertise on GTM teams reflects how modern enterprise software deals are rarely won without it.
Customer Success Engineers ensure the successful implementation and adoption of AI platforms. These reps work closely with CS and product teams to resolve issues and optimize implementations that already exist. Success is measured in customer outcomes such as adoption rates and satisfaction scores.
Forward Deployed Engineers embed within customer environments to build, deploy, and optimize AI systems around a client’s business requirements. As more organizations deploy customized AI agents, FDEs are crucial to helping customers configure those applications to perform tailored functions.
Both positions bring what they learn in live customer environments back to your product team. CSEs share technical feedback from active implementations, while FDEs discover which product features drive impact for specific clients and which can deliver value across markets.
Customer Success Engineers Keep Enterprise Deployments Healthy
A CSE is a post-sale technical specialist who sits where customer problems meet product capabilities. This includes finding the configuration limits, integration conflicts, and performance bottlenecks that surface after deployment. CSEs often become product experts faster than almost any other role because they meet edge cases and integration challenges every day.
The role’s responsibilities include:
- Implementation reality checks: Closing the gap between what was sold and what can be delivered within the customer’s constraints.
- Technical debt management: Acting as the first line of defense when customers push the product past standard use, and judging when a workaround is appropriate and when a product enhancement is necessary.
- Customer-driven innovation: Channeling technical feedback from live implementations to product teams, where it carries particular weight because it comes from actual customer usage.
CSEs work alongside Enterprise CSMs (ECSMs), who focus on strategic account planning and business outcome optimization while the CSE concentrates on product health monitoring, integration support, and proactive issue resolution. This division of labor helps vendors cover both the business and technical sides of a high-value account.
Candidates typically arrive from one of three paths: software engineers who find resolving customer problems more rewarding than developing features; CSMs who built technical depth through repeated exposure to product challenges; and consultants from professional services who combine technical delivery experience with customer relationship skills.
Forward Deployment Engineers Build Inside the Customer’s Environment
Palantir created the Forward Deployed Software Engineer (FDSE) role to design and implement solutions alongside customers. AI companies of all sizes have since adopted it, particularly for costly, complex enterprise deployments. By writing code, building integrations, and creating custom solutions, FDEs effectively become a temporary member of each customer’s engineering team.
The engagement begins after the sale and typically moves through five steps:
- Knowledge transfer from the sales team that covers customer requirements and success criteria
- Implementation planning with a detailed technical roadmap and timeline
- Customer onboarding, with the FDE taking primary responsibility for technical deployment
- Go-live support to confirm a successful production deployment
- Ongoing optimization followed by a transition to standard Customer Success for relationship management
The Forward Deployed Engineer shares skills with software engineers, Sales Engineers, Solutions Architects, and consultants, which can make it difficult to assess the likelihood of a candidate’s success in the role. Qualified candidates are skilled at writing production code, working closely with customers, and engaging with C-suite executives.
Top Differences Between the Roles
The titles separate along three lines: the technical work each performs, the team each joins, and how long each stays on the account.
Scope of Technical Work
Customer Success Engineers work on the product as it ships by diagnosing, configuring, and optimizing deployed systems. They trace issues across integrated platforms, deciding when a customer request calls for a workaround vs when it calls for product development.
Forward Deployed Engineers build to a specific customer’s needs by writing code, building integrations, and creating custom solutions inside the customer’s environment.
Team Placement
The CSE pairs with the account team (the Enterprise CSM holds the strategic plan while the Customer Success Engineer brings technical depth to the same accounts) and works with product teams to resolve issues.
The FDE embeds with the customer’s engineers. If your enterprise customers regularly need on-site implementation support, it’s time to bring on a Forward Deployed Engineer.
Engagement Length
The enterprise deal lifecycle runs through discovery, validation, proof-of-concept, sale, deployment, and expansion. A CSE picks up at implementation and stays through expansion, answering for adoption rates and satisfaction scores alongside technical performance.
A Forward Deployed Engineer stays embedded through the implementation lifecycle. After go-live, the work moves to optimization and often expansion while relationship management passes to standard Customer Success. FDE bonuses tie to production deployments, satisfaction scores, renewal rates, and expansion revenue.
Signs Your Enterprise Accounts Need an CSE or FDE
Support queues, implementation timelines, and engineering workload give you the clearest view of which seat your enterprise accounts call for. Each role draws on its own set of signals:
Signs You Need a CSE
- Support tickets that need engineering intervention exceed 15% of total volume
- Implementation timelines run past projections
- Technical questions at renewal pull in the product team
- Integration support requests overwhelm existing Customer Success capacity
Signs You Need an FDE
- Customer deployments require significant technical customization or environment-specific integrations
- Product teams spend substantial time on customer-specific implementations
- Revenue depends heavily on enterprise accounts with complex implementations
- Technical support tickets increasingly require engineering involvement
Technical support tickets that reach engineering appear on both lists and typically show which seat fits. Requests to fix or optimize existing functionality tend to fall within CSE responsibilities, while requests for new functionality are more characteristic of FDE work. Enterprise teams seeing both types of requests may benefit from having both roles.
Hire Your Next CSE or FDE With Betts Recruiting
Betts Recruiting has helped tech companies hire thousands of enterprise GTM professionals since 2009, and we will provide you with the expertise and solutions you need to identify and fill the top roles for your team. Whether you are searching for a CSE, an FDE, or any other position on your go-to-market team, Betts can help you find the right candidate for the role faster.
Contact Betts here to get started on building the post-sale technical team that will secure your enterprise accounts.