Material 3 + Cupertino apps
Adaptive UI that respects platform conventions where it should and overrides them where the brand demands it.
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Senior engineering · Flutter
Senior Flutter engineering for production systems.
Flutter where pixel-perfect cross-platform UI is the value — Dart, Riverpod, custom rendering with Skia / Impeller, and the design-system discipline Flutter rewards.
- In production
- 2020+
- Senior bench
- 12+ G6/G9 engineers
- Floor
- G6+ on client work
- Engagement
- Outcome-led, not hourly
Why senior, not contractor
Flutter in production is a different problem than Flutter on a laptop.
Flutter wins for design-heavy apps where pixel-perfect cross-platform UI matters and where the team can invest in Dart. Prosigns ships Flutter for greenfield apps with strong design constraints, for kiosk / embedded / desktop targets where Flutter's Skia rendering is the value, and for cross-platform brand apps where the team is willing to commit to the language and ecosystem long-term.
Senior floor
G6+ minimum
Bench depth
12+ G6/G9 engineers
In production
2020+
Engagement
Outcome-led SOW
Where Flutter ships
6 sub-areas, grounded in shipped engagements.
Specific applications of Flutter we’ve built and operate. Every example below maps to a real engagement, not a bullet on a stack-card.
01 02 State management with Riverpod
Riverpod / Bloc / GetX depending on team preference and app size. Typed providers, testable architectures.
03 Custom rendering with Skia / Impeller
Custom painters, complex animations on the GPU thread, Impeller-aware performance tuning.
04 Embedded + desktop + web
Linux / Windows / macOS desktop apps, Flutter for embedded (kiosk, automotive). Flutter web where its tradeoffs fit.
05 Native module integration
Method channels for platform-specific code, Pigeon for type-safe channel APIs, FFI for raw native interop.
06 Firebase + backend integration
Cloud Firestore, Auth, Functions, FCM. Or any REST / GraphQL backend with proper Dart-side type safety.
Stack depth
The Flutter ecosystem, owned.
Frameworks, libraries, and runtime tools the bench has shipped in production. Not a CV-skim — a working depth.
Core
- Flutter 3.22+
- Dart 3.4+
- Material 3
- Cupertino
- Impeller
State management
- Riverpod
- Bloc
- Provider
- GetX
- MobX
Networking + data
- Dio
- Retrofit (Dart)
- Drift
- Isar
- Hive
UI + animation
- Rive
- Lottie
- flutter_animate
- fl_chart
- Custom painters
Quality + ops
- flutter_test
- Patrol
- Mockito
- Sentry
- Firebase Crashlytics
Engagement models
Three ways to engage Flutter engineers.
We don’t bill hourly contractors. Engagements run against outcomes — choose the shape that matches the work.
See engagement models- 01
Fixed-scope
Defined deliverable, fixed price
When the deliverable is clear and the scope is bounded — an MVP, a migration, a discrete platform build. Senior engineering against a written outcome, not against a body count.
- 02
Embedded squad
Senior product team, ongoing
When the work is product-shaped and the cadence is continuous. A senior pod (engineering + design + PM as needed) embedded into your team, with the practice lead co-piloting from HELM.
- 03
Managed services
Steady-state operations
When the system is running and needs ongoing engineering ownership — operations, SLO defense, release management, security and compliance evidence. Monthly retainer against a published SLA.
Selected work
Flutter engineering that shipped.
Education
Cross-platform student app on Flutter for a global ed-tech provider.
iOS + Android + Websingle codebaseMaterial 3 + Cupertino adaptive UI. Riverpod state management. Drift for offline storage. Pigeon-typed native modules for camera / proctoring SDK integration. Shipped to web alongside iOS / Android.
Duration · 7 months
Brief us
Reply < 4 business hoursHave a Flutter workload? Send a brief.
Five fields. Goes straight to the practice lead — not an SDR. We’ll reply with a senior engineer’s read on fit, scope, and the engagement model that suits the work.
FAQ
Questions buyers ask.
Everything below also appears in the proposal and the SOW — no surprises after signing.
Flutter or React Native?
Flutter when pixel-perfect cross-platform UI is the value, when the team can commit to Dart, and when design-heavy interaction is the spine. RN when JS / TS skills dominate the team and code-share with web matters. Both are credible cross-platform choices in 2026.
Dart — really, in 2026?
Yes. Dart 3 is a serious language with sound null safety, records, patterns, and good tooling. The language is stable, the compilation story is mature, and the Flutter framework is the value. Team velocity in Dart stabilizes within 2-3 months for most engineers.
Is this staff-aug, or is it engineering-led delivery?
Engineering-led delivery. We don't bill hourly contractors against your JIRA board. Every engagement runs against a defined outcome with a senior engineer accountable from kickoff to operating cutover. If you genuinely need staff-aug — discrete bodies, your management, hourly rates — we'll be honest and route you to a partner that fits.
What seniority floor are we talking about?
G6 minimum (six-plus years in their craft) on every billable hour. Department leads are G9 or G10. We don't flex juniors onto the bench mid-sprint, we don't subcontract to delivery centers, and we don't dilute senior rates with mixed staffing. The bench in the proposal is the bench in production.
How does pricing work?
Three engagement models published at /engagement-models/. Fixed-scope for defined deliverables, embedded squads for ongoing product work, managed services for steady-state operations. Rates depend on seniority, engagement length, and region. Discovery + scoping conversation is free; SOWs are written against deliverables, not bodies.
Where are your engineers based?
Senior-only across Dallas, Doha, Lahore, and Islamabad. We staff against the engagement's needs (timezone, language, regulatory frame), not against arbitrary regional preferences. Most engagements run with a US/EU-aligned core and a follow-the-sun extended bench when the workload warrants it.
Will the engineers I see in the proposal be the engineers shipping the work?
Yes. We name the engineers in the SOW, attach their profiles, and they're on the kickoff. We don't bait-and-switch with senior reviewers and junior execution. If a named engineer needs to roll off the engagement (rare), we surface a replacement from the same seniority tier with explicit handoff.
Talk to a Flutter lead
Senior Flutter engineering, accountable from kickoff.
Bring the workload — we’ll bring a senior engineer plus the practice lead most relevant to the work. 30 minutes, no obligation, no junior reps.