SaaS Build Retainer

The Build Retainer gives launched SaaS teams ongoing design and engineering capacity from one integrated team, billed as a predictable monthly subscription. It is the continuation path after the MVP — continuous product development without hiring in-house.

You get a team that already knows your product and ships every cycle, instead of scoping a fresh project each time you need work done. Capacity stays steady, context stays with us, and cost stays the same line on your budget month to month.

Because strategy, UX, and full-stack engineering sit in the same team, you direct one group rather than coordinating a separate design vendor and a separate development vendor across every change.

One integrated design and engineering team on a fixed monthly fee
Continuous shipping against a roadmap you reprioritise each cycle
Context retained across months instead of rebuilt per project
Tier up, tier down, or pause as your roadmap changes
Two-month minimum term, then month-to-month

SaaS product team working through a monthly build retainer cycle

A steady cycle, not a one-off project

The retainer runs on a repeating cycle so your product keeps moving without renegotiating scope every time a new priority appears.

Onboarding & Backlog

We learn your product, codebase, and goals, then shape a working backlog the team can pull from.

Prioritise Each Cycle

At the start of each cycle we agree the highest-leverage work for your current stage.

Design + Build in One Flow

Design and engineering happen in a single workflow, so decisions stay aligned end to end.

Ship & Review

We ship throughout the cycle and review what landed, what it changed, and what comes next.

Adjust Capacity

You tier up, tier down, or pause as the roadmap demands — the team flexes with you.

Continuity instead of restarts

Every one-off project begins with rediscovery. A retainer keeps the same team shipping, so momentum carries between cycles.

Context that stays with the team

The people who built last month's work build this month's, so product knowledge compounds rather than leaking out at handover.

Predictable, fixed monthly cost

A flat subscription replaces per-project quotes and hourly billing, so product spend stays a single, plannable line.

One team, design and engineering

Instead of hiring in-house or directing a staff-aug shop, you get one accountable team covering UX and full-stack work together.

Pricing & tiers

Value-based monthly tiers you can adjust as your roadmap changes

Each tier is a fixed monthly fee for a defined amount of integrated design and engineering capacity. You direct how that capacity is spent each cycle, and you can move between tiers as the work ahead grows or settles. A two-month minimum term lets the team onboard and build momentum before any change.

Focused

from £6,000/mo

Part-time blended design+engineering capacity for steady iteration.

Core

from £11,000/mo

Full-time integrated squad shipping continuously.

Scale

Custom

Expanded multi-discipline team for faster roadmaps.

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SaaS build retainer dashboard showing continuous product delivery progress

A retainer suits teams that have launched and need product to keep moving, not a single project that ends and leaves a gap.

2mo

Minimum term, then month-to-month — adjust your tier or pause each cycle as needs change.

1

One integrated team across strategy, design, and full-stack engineering — no vendor coordination.

3

Tiers from part-time capacity to a full multi-discipline squad, sized to your roadmap.

Not sure how to structure ongoing product capacity? Our guide to SaaS development team models compares in-house hiring, staff augmentation, and the retainer model in more detail.

FAQ

Common questions about the Build Retainer

The Build Retainer is a productized monthly subscription that gives your SaaS team ongoing design and engineering capacity from one integrated Celvix team. It is the continuation path after launch — continuous product development on a predictable recurring model, without hiring in-house.

Pricing is value-based and tiered. Focused starts from £6,000/mo for part-time blended design and engineering capacity, Core starts from £11,000/mo for a full-time integrated squad, and Scale is custom for an expanded multi-discipline team. You pay a fixed monthly fee rather than per-hour, so cost stays predictable.

There is a two-month minimum term so the team can onboard and build momentum. After that you can adjust your tier up or down each cycle, or pause the retainer when your roadmap quietens and resume when it picks up again.

Both. The same integrated team covers product strategy, UX and UI design, and full-stack engineering. Within your tier you direct the mix each cycle, so a month heavy on design and a month heavy on shipping both fit the same subscription. See our design and development services for the full range of work the team can take on.

Hiring in-house means recruitment time, fixed salaries, and management overhead. A staff-aug dev shop drops in bodies you still have to direct and that rarely include design. The Build Retainer gives you a self-directing team that retains context across cycles, covers design and engineering together, and flexes with your roadmap at a predictable monthly cost. Our guide to SaaS development team models compares these options in detail.

It is for SaaS teams that have launched and need continuous product development — shipping features, refining UX, and paying down technical debt — without building a full in-house team. It suits founders and product leaders who want one accountable team rather than coordinating separate design and engineering vendors.

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SaaS Build Retainer