# Staff and Principal FDE: why the rungs above Senior don't match the SWE ladder

> Above Senior, an FDE is no longer judged by the size of the systems they own, but by how much customer ambiguity they absorb and how much knowledge they bring back to the company.

Original: https://fdetimes.net/en/analysis/staff-principal-fde-career-ladder/

Bloomberry analysed around 1,000 Forward Deployed Engineer job postings. Among those that stated years of experience, only 8% asked for nine years or more, which is Staff+ territory. Most hiring demand sits at mid to senior level.

That figure explains a feeling many Senior FDEs know well: projects ship on time, customers renew, and the next step is unclear. The SWE ladder already has a vocabulary for Staff and Principal. Apply that vocabulary to FDE work and it is off from the unit of measurement onwards.

The consequences are concrete. If you don't know what the level above yours is given, you will collect the wrong evidence: more lines of code, more projects, while the people reviewing you are looking for something else.

## The SWE ladder measures systems; FDE measures customers

According to a hiring guide from Recruiting from Scratch, on the SWE side a Staff engineer's scope is their own team plus adjacent systems, while a Principal reaches across several teams, a large system or the whole company, with organisational rather than purely technical impact.

That yardstick assumes you have a system to "own". FDEs often don't: the work happens inside the customer's systems, and each engagement is a new environment.

Allen C offers a more useful measure: seniority is the ability to find and deliver solutions to increasingly ill-defined problems. In his view, Staff and Principal engineers are the people who turn business requirements into technical plans. Applied to FDE work, that measure describes almost exactly what the job involves day to day.

## What is a Staff FDE actually given?

MongoDB's Staff FDE posting asks for nine or more years of experience and gives the role the most complex customer engagements and technical areas.

Alongside that come two responsibilities not tied to any single account: mentoring senior engineers and sharing good practice across teams. The posting also asks the holder to build or improve mechanisms, standards and operating practices so that teams make better decisions.

Google's Staff FDE posting puts the emphasis elsewhere. The role owns the customer's entire technical journey, from first contact to lasting customer success. It is also the main technical conduit connecting how customers use the product with the core engineering team's roadmap.

Read side by side, the two postings suggest three parts to the Staff role. The first is carrying the hardest engagements. The second is turning experience into standards others can use.

The third is bringing signals from the field back to the product. A career guide from FDE Pulse also describes the Staff/Lead FDE as the person who defines ways of working and the playbook.

The first part matches an archetype Will Larson describes on staffeng.com: the Solver, who digs into problems however messy they are and finds a suitable way forward. That archetype is close to how many Staff FDE roles are used with strategic customers. But being only a Solver covers just a third of the job.

**Key point:** Above Senior, FDEs are paid for what remains after they leave the customer.

## The conversion table no job posting prints

The table below sets the common SWE levelling alongside what Staff FDE postings actually ask for. The Principal FDE row is inferred from the other two, as there is no agreed definition for that level.

| Aspect | Common SWE ladder | FDE work |
|---|---|---|
| Unit of scope | Team, system, organisation | Engagement, customer portfolio, feedback loop into the product |
| Staff is given | Own team plus adjacent systems | Hardest engagements, mentoring seniors, operating standards, conduit into the roadmap |
| Principal is given | Several teams or the whole company, organisational impact | Inferred: influence on how the whole company serves many customers and shapes the product |
| Evidence for promotion | Technical quality, breadth of systems | Customer impact plus technical quality |

The table leaves out one question you have to ask yourself first: at the company you are targeting, does a level above Senior exist at all?

## Why comparing levels across two companies is almost meaningless

Bloomberry found that companies use the same title, "Forward Deployed Engineer", for three different kinds of work. So a Staff FDE at one company and a Staff FDE at another may not even be doing the same job, let alone sit at the same level.

Larson points to a similar problem within SWE: career ladders often hide several different roles under one title. For FDEs the cover is twice as thick. The job title is already vague, and the levels above it add another layer of vagueness.

Then there is the question of whether the level exists. FDE Pulse's guide notes that at small companies Senior FDE may already be the top individual-contributor level. Combined with Bloomberry's 8% figure, the picture is fairly clear: the market hires many FDEs but few Staff FDEs, and many companies have no place for that level yet.

## The same customer at two levels

Imagine a customer hits a performance problem when taking the product into production. A good Senior FDE diagnoses it, fixes it, writes handover documentation, and the customer moves on. That is good work, but all its value stays within one account.

A Staff FDE does three more things. They notice this is the third customer to hit the same fault this quarter and turn the fix into a pre-production checklist for the whole team.

They sit with a senior engineer so that person can handle it alone next time. Then they take the usage pattern that caused the fault back to the product team, with enough data for that team to decide whether to fix it at the product level.

One rung higher, a Principal might be pictured as the person who changes how the whole company takes on and deploys a certain type of customer. That reading fits the organisational impact the SWE ladder describes. But it is an inference, not an industry-standard definition.

## Collect evidence against the right yardstick

FDE Pulse sums up the FDE promotion criteria in one line: you must demonstrate customer impact alongside technical quality. In other words, missing either half makes a promotion case hard to sustain. Elegant code not tied to customer outcomes is weak. A happy customer with a solution nobody can maintain is weak too.

When reading job postings, look for the verbs that signal scope. "Own the most complex engagements" is the Solver part. "Mentoring", "standards", "operating practices" are the mechanism-building part. "Conduit to the roadmap" is the product-feedback part. If a Staff posting contains only the first, ask how the actual scope differs from a Senior role.

In interviews, ask directly whether the company has a level above Senior for FDEs, and how the people at that level are evaluated. At a small company the answer may be that it doesn't exist yet. Knowing that before you sign is far better than finding out two years later.

On your CV, every line should prove one of the three parts of the role. A line like "deployed for customer X" only proves you were there. Lines such as "standardised a process other teams now use" or "brought a piece of customer feedback onto the roadmap" show the reader you are already doing the work of the next level.

The SWE ladder asks how many systems you own. The FDE ladder asks a harder question: after you leave a customer, do other people in the company do better?

**Try this week:**

- Take a Staff FDE job posting, underline every verb that signals scope (own, mentor, establish, act as conduit), and next to each one note something you have actually done.
- Pick a fix you have repeated at two or more customers, write it up as a one-page playbook and share it with colleagues.
- Write down one piece of customer feedback you got into the product backlog or roadmap, along with the outcome. That is a Staff-level CV line.

## Sources

- [Staff Forward Deployed Engineer @ MongoDB | AlleyCorp Job Board](https://jobs.alleycorp.com/companies/mongodb/jobs/88345358-staff-forward-deployed-engineer)

- [Staff Forward Deployed Engineer, Developers and Experiences](https://jobs.anitab.org/companies/google-24698/jobs/63900222-staff-forward-deployed-engineer-developers-and-experiences)

- [Staff archetypes (Staff Engineer: Leadership beyond the management track)](https://staffeng.com/guides/staff-archetypes/)

- [Staff Engineer vs. Principal Engineer: Hiring Differences and What Each Actually Does (2026)](https://www.recruitingfromscratch.com/blog/staff-engineer-vs-principal-engineer-hiring-differences-and-what-each-actually-does-2026)

- [What I learned analyzing 1K forward deployed engineer jobs](https://bloomberry.com/blog/i-analyzed-1000-forward-deployed-engineer-jobs-what-i-learned/)

- [Seniority, as a Measure to Increasingly Undefined Problems](https://allenc.com/seniority-as-a-measure-to-increasingly-undefined-problems)

- [FDE Levels & Career Progression](https://fdepulse.com/career/forward-deployed-engineer-levels/)