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Custom Software · FORGE

Custom Software.

Production custom software: SaaS platforms, enterprise applications, legacy modernization, integrations, and mobile. Built by senior engineers who have shipped this exact pattern before, not by a junior squad with a deck.

Book a discovery callGet a scoped plan
Sub-services
5
Department
FORGE

The problem

Most custom software ships two quarters late, twice the cost, and missing the load-bearing parts.

The shape of the failure is consistent: a discovery phase that reads more like an estimation gauntlet than a design exercise; a build phase staffed with a rotating cast of mid-level engineers; deferred decisions on auth, observability, and migration; integration work scoped as 'phase 2' that turns out to be load-bearing; and a launch that exposes the architecture to the load it wasn't designed for. Custom software fails at the seams between systems and at the gaps between contracted scope and operating reality.

Prosigns ships custom software the way the practice was supposed to work. Senior engineers from the first day, no junior bench rotations. Architecture decisions made up front in writing, with department co-pilots for the cross-cutting concerns (security, data, platform) the build team would otherwise underweight. Integration is treated as primary scope, not a footnote. The bench you see in the proposal is the bench in production, and the engineer who wrote the SOW is the engineer who staffs the engagement.

What we deliver

5 capabilities, one bench.

SaaS, enterprise applications, legacy modernization, integrations, and mobile.

How we engage

4 phases, in writing.

The methodology shows up in the statement of work, not as slogans, but as deliverables, owners, and acceptance criteria.

  1. 01

    Architecture in writing

    Two-week design phase: data model, integration surface, auth boundaries, observability, deployment topology, scaling thesis. Output is an Architecture Decision Record, not slides. The ADR becomes the contract for the build phase and the artifact your platform team can challenge.

  2. 02

    Integrated build squad

    Senior engineers (G6+) plus department co-pilots from FORGE (lead), CITADEL (compliance), NEXUS (cloud), and CORTEX (where AI is in scope). Two-week sprints with named acceptance criteria per increment. No junior bench rotations, no opaque hand-offs.

  3. 03

    Production-first cutover

    Deployment topology designed before the first commit. Infrastructure as code, environment promotion, observability and runbooks shipping alongside the application. Gradual cutover with documented rollback paths, not a flag flip and a prayer.

  4. 04

    Operate or hand off

    Choose: stay with us under Managed Services for ongoing operations and feature delivery, or hand off with a 90-day shadowing period and complete operational documentation. Either way, the runbook, ADR set, and eval suite are yours from day one.

Capabilities

What’s in scope.

  • Multi-tenant SaaS architecture: billing, onboarding, identity, scale
  • Enterprise applications: internal tools, workflow apps, system integrations
  • Legacy modernization: strangler-fig migrations, replatform vs rearchitect
  • API & integration: REST, GraphQL, gRPC, event-driven, iPaaS gateways
  • Mobile: React Native, native iOS/Android, offline-first patterns
  • Auth, RBAC, and audit-defensible identity layers (OIDC, SAML, SCIM)
  • Observability stacks: structured logging, metrics, tracing, SLO dashboards
  • Migration tooling: dual-writes, traffic shadowing, replay infrastructure

Stack

Tools we use in production.

Languages
TypeScriptPythonGoJavaKotlinSwift
Web frameworks
Next.jsReactRemixVueDjangoFastAPISpring
Mobile
React NativeSwift / SwiftUIKotlinExpo
Databases
PostgreSQLMySQLMongoDBDynamoDBRedisElasticsearch
Cloud & ops
AWSAzureGCPTerraformKubernetesDatadog
Identity & integration
Auth0OktaAzure ADWorkatoMuleSoftApache Kafka

Selected work

Quantified outcomes, not adjectives.

All case studies

Common questions

Asked before the first call.

  1. 01

    What kinds of custom software does Prosigns build?

    Production systems across five categories: multi-tenant SaaS platforms, enterprise applications and internal tools, legacy modernization and replatforming, API and integration work, and mobile applications. We don't take on prototype-only or design-only engagements, every project is scoped to ship into production with monitoring, governance, and an operations plan.

  2. 02

    Are you fixed-price or time and materials?

    Both, depending on the engagement model. Project-Based delivery is fixed-price with milestones and explicit acceptance criteria: best for bounded initiatives. Dedicated Teams is time and materials with quarterly cadence: best for multi-quarter capability gaps. Managed Services is a monthly retainer with named SLAs, best for ongoing operations of what we built or what you built. We publish all three honestly with budget brackets.

  3. 03

    Do you work with our existing team or replace them?

    Mostly with: pure replacement is rare. Most engagements embed senior engineers alongside your team, sharing repos, ceremonies, and ownership. Where we do greenfield work end-to-end, we hand off with a 90-day shadowing period and full documentation so your team owns operations after we leave. The only times we replace are when the customer has explicitly decided to dissolve the existing team or when there is no existing team yet.

  4. 04

    Can you ship with our compliance constraints?

    Yes: that's CITADEL's job. SOC 2 Type II, ISO 27001 alignment, HIPAA, GDPR / CCPA / PIPEDA, PCI-DSS, FedRAMP, and NERC CIP are all in our active engagement portfolio. Compliance evidence is collected continuously during delivery rather than scrambled at audit time. We engineer to your specific posture in the discovery phase, not to a generic 'we're compliant' checkbox.

  5. 05

    How do you handle legacy modernization?

    Strangler-fig migration is the default. We assess what to replatform, what to rearchitect, and what to retire: then build the migration tooling (dual-writes, traffic shadowing, replay) that lets us cut over incrementally. Most engagements migrate workloads in 5–15% increments with documented rollback at every stage. Big-bang cutovers are reserved for the rare cases where the substrate is so broken that nothing can be salvaged, and we will tell you when that's the case.

  6. 06

    What if we don't know what we want yet?

    That's what discovery is for. A 4–6 week discovery engagement (fixed-price, $50K–$150K) produces an Architecture Decision Record, a phased delivery plan, a defensible budget, and a recommended engagement model. Many discovery engagements end with us recommending you don't proceed with us, or don't proceed at all. We'd rather lose the build than ship something that wasn't ready to be built.

  7. 07

    Do you do design as part of the build?

    Yes: CANVAS (our design and UX department) embeds into the build squad rather than operating as a separate phase. Product design, interaction design, design systems, and accessibility-first interfaces ship inside the engineering cadence. We don't run a separate design phase that hands off to engineering after a Figma review.

  8. 08

    What are typical custom software engagement budgets?

    Discovery + ADR: 4–6 weeks, $50K–$150K. Production build for a focused initiative: 3–6 months, $250K–$1M. Multi-quarter platform builds with embedded squads: $1M–$5M+. Managed services for ongoing operations: $40K–$150K monthly retainer. Brackets published honestly so visitors self-qualify before the first call.

Related practices

Often paired with Custom Software.

Talk to us

Bring a custom software problem. We’ll bring a senior engineer.

A senior engineer plus the FORGE department lead joins the first call. No discovery gauntlet, no junior reps, no obligation.

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