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Custom Software & Full-stack

Senior engineers on React, Node, Python, Go, and the rest of the modern stack - embedded in your sprint, not a delivery black box

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SalesforcePower PlatformRetool & Internal ToolsShopify & E-commerceAI Agents & RAGCustom Software & Full-stack
SapotaCorp

Architecture Review

Free 45-minute call - send us the repo or an architecture diagram; we'll come back with a punch list of concrete risks.

What we ship when a platform doesn't fit

Five capability groups - web applications, APIs and back-end, data, mobile and desktop, and the infrastructure work that makes launches survivable.

Most of our engagements start because a Salesforce / Power Platform / Shopify / Retool build hit a wall - or because there was never a platform that fit in the first place. We bring senior full-stack engineers into your team at $1,800-$2,400/engineer/month, work inside your sprint, and leave documented code a future in-house team can own.

Senior engineers on the modern full-stack — from greenfield SaaS to mobile, infra, and data.

ReactNext.js (App Router)RemixVue 3 / NuxtSvelteKitAngularTailwind / shadcnNode.js (Nest / Fastify)Python (FastAPI / Django)Go (Echo / Gin)Rails.NET 8Spring BoottRPC / GraphQL / gRPCPostgresMongoDBClickHouseKafka / RedpandaReact Native (Expo)FlutterSwift / KotlinTauriAWS / GCP / AzureTerraform / PulumiKubernetesVercel / CloudflareGitHub ActionsOpenTelemetryDatadog / Sentry

Web applications - from MVP to scale

The bulk of our full-stack work. Greenfield products for startups, platform replatforms for scale-ups, and targeted feature teams for enterprise.

  • Greenfield SaaS on Next.js App Router / Remix / Nuxt - auth, billing, multi-tenant data isolation, admin console
  • Multi-tenant architectures - row-level security, schema-per-tenant, tenant-aware caching and rate limiting
  • Authentication and authorization - Clerk, Auth0, WorkOS, Supabase Auth, custom OIDC, SAML SSO, SCIM, RBAC / ABAC
  • Billing integrations - Stripe, Chargebee, Paddle, Lemon Squeezy - usage-based metering, invoicing, dunning, webhooks
  • Real-time features - WebSockets, Server-Sent Events, Supabase Realtime, Ably, Pusher, Liveblocks for collaboration
  • Complex forms and wizards - React Hook Form, Zod/Valibot, conditional logic, multi-step, autosave, resume
  • Admin and internal tools embedded in the same codebase or broken out to Retool - we help decide which
  • Migrations from legacy stacks - CoffeeScript / AngularJS / jQuery / Rails monolith into modern TypeScript gradually

API design & back-end services

The contract between your client and your data. We design for forward-compatibility, observability, and the failure modes that actually happen in production.

  • REST APIs with OpenAPI 3.1 specs, contract-first design, generated TypeScript clients, Spectral linting in CI
  • GraphQL schemas with Apollo, Yoga, or Pothos - dataloader batching, cost analysis, persisted queries, N+1 prevention
  • gRPC services for internal platform work - protobuf-first, buf lint/breaking, grpc-gateway for HTTP bridge
  • tRPC for TypeScript-only monorepos with end-to-end type safety and minimal schema duplication
  • Background jobs and queues - BullMQ, Sidekiq, Celery, Temporal, river - with retries, DLQ, and observability
  • Event-driven architectures - Kafka, Redpanda, SNS/SQS, EventBridge, NATS - with idempotency keys and schema registry
  • Webhook ingestion with signature verification, retry handling, idempotent processors, dead-letter visibility
  • API gateway and rate-limiting - Kong, Envoy, Cloudflare Workers, Tyk - with per-tenant quotas and auth

Data - modeling, migrations, analytics

What sits behind the API. Schema design that survives contact with growth, migrations that roll forward and back, and analytics paths that don't slow down your transactional workload.

  • Relational schema design in Postgres / MySQL - normalization to 3NF, selective denormalization, partitioning, indexes
  • Schema migrations - Prisma / Drizzle / Knex / Alembic / Atlas / sqitch - with zero-downtime rollout patterns
  • Database performance - EXPLAIN ANALYZE walkthrough, pg_stat_statements tuning, connection pooling with PgBouncer
  • Full-text and vector search in Postgres with tsvector, trgm, pgvector; or OpenSearch / Typesense / Meilisearch
  • CDC pipelines - Debezium / pg_logical → Kafka → consumers; Fivetran / Airbyte for SaaS-to-warehouse
  • Analytics warehouses - Snowflake, BigQuery, Redshift, ClickHouse, DuckDB - with dbt models and lineage
  • Event tracking and product analytics - PostHog, Amplitude, Segment, Mixpanel - with server-side CAPI
  • Data privacy and compliance - GDPR subject requests, right-to-erasure, audit logs, field-level encryption

Mobile, cross-platform & desktop

When the product isn't only a web tab. Native where it matters, cross-platform where it doesn't.

  • React Native with Expo EAS - OTA updates, native modules when needed, Sentry + Crashlytics error tracking
  • Flutter apps - Riverpod / Bloc state management, platform channels, background isolates, Flutter Web
  • Native iOS (SwiftUI + Swift Concurrency) or Android (Jetpack Compose + Kotlin Coroutines) when cross-platform compromises cost you
  • App Store and Play Store submission - review-readiness checklists, privacy manifests, iOS 18 / Android 15 requirements
  • Push notifications - Firebase Cloud Messaging, APNs, with server-side scheduling and user preference respect
  • Offline-first sync - Watermelon DB, PowerSync, Replicache - conflict resolution, background sync, queue visibility
  • Desktop apps - Tauri (Rust) or Electron - with auto-update, code signing, native menus, notifications
  • Embedded web views with secure bridges, deep linking, universal links, App Clips / Instant Apps

Infrastructure, DevOps & reliability

The part that separates a launch from a product you don't dread deploying to. Observability, IaC, rollback lanes, and on-call hygiene.

  • Infrastructure as code - Terraform, Pulumi (TypeScript/Go), CDK - with drift detection and state hygiene
  • Kubernetes clusters on EKS, GKE, AKS - Helm charts, ArgoCD / Flux, horizontal pod autoscaling, pod security standards
  • Serverless - Vercel, Cloudflare Workers, AWS Lambda, Google Cloud Run - with per-route caching and cold-start tuning
  • CI/CD pipelines - GitHub Actions, GitLab CI, CircleCI - with parallel jobs, caching, preview environments per PR
  • Observability - OpenTelemetry, Datadog, Grafana stack (Loki, Tempo, Mimir), Honeycomb, Sentry with source maps
  • Incident response - PagerDuty / Opsgenie runbooks, SLO dashboards, error budgets, blameless postmortems
  • Security hardening - SAST (Semgrep, CodeQL), SCA (Snyk, Dependabot), secret scanning, SBOMs, SOC 2 support work
  • Cost optimization - right-sizing, spot / preemptible instances, CDN tier audits, egress reduction
faq

Common questions from engineering leads

Staff-aug. Our engineers join your team for a monthly rolling engagement - your Jira, your Slack, your PR review. We don't build software in a black box and hand it over at the end. That model hasn't served anyone well for years.

React / Next.js / Remix + Node / Python / Go covers ~80% of our work. Ruby on Rails, Elixir, Rust, .NET, Java Spring Boot are all things we've shipped - the team matches to the project rather than trying to sell you a favorite.

Yes - this is where many engagements start. First two weeks are code walkthrough, ADR review, tech-debt triage, and a focused deliverable. If the codebase is in bad shape we'll tell you, with a concrete remediation plan, rather than pretending to 'fit in' quietly.

Yes. Not as a separate consulting offering - as part of the engagement. ADRs, RFCs, tech-stack selection, build-vs-buy, and hiring-plan input are all normal activities when your engineer is embedded with the team.

Depends on your regime - SOC 2, ISO 27001, HIPAA, PCI DSS, GDPR. We support evidence collection, code hardening (Semgrep, CodeQL, dependency scanning), SBOM generation, and secret management. We don't issue audits, but our work survives them.

A 2-week paid trial scoped to a concrete deliverable on your backlog. If the engineer doesn't ship what you expect, you pay for the two weeks and part ways - no ramp-down penalty, no contract tail.
why SapotaCorp

Why teams pick us for custom software

Senior-only team

Every engineer you interview has 6+ years shipping production software. No junior pairings, no shadow team behind the scenes - who you meet is who codes.

Inside your sprint

We join your Jira, your Slack, your standups, and your PR review. Not a delivery black box - you see commits daily and control the backlog.

Tests and types on day one

TypeScript strict, static analysis in CI, unit + integration tests with meaningful assertions, and PR templates that force a self-review. Not optional extras.

Clean handover built in

Documented architecture, runbooks, ADRs, and onboarding guides from week one - so if you bring it fully in-house, transition is days not months.

full-stack tech stack

The stack we work in

Web front-end

React, Next.js (App Router, Server Actions), Remix, Vue 3, Nuxt, Svelte/SvelteKit, Angular, TanStack Query/Router, Tailwind, shadcn/ui, Radix.

Back-end & APIs

Node.js (Nest, Fastify, Hono), Python (FastAPI, Django), Go (stdlib, Echo, Gin), Ruby on Rails, .NET 8, Java Spring Boot, tRPC, GraphQL, gRPC.

Mobile & cross-platform

React Native (Expo), Flutter, Swift/SwiftUI, Kotlin, Kotlin Multiplatform, Tauri, Electron for desktop.

Data, infra & DevOps

Postgres, MySQL, MongoDB, Redis, ClickHouse, Kafka, AWS, GCP, Azure, Cloudflare, Vercel, Fly, Terraform, Pulumi, Docker, Kubernetes, GitHub Actions, GitLab CI.

start a trial

Two weeks to prove the fit.

Paid trial, your stack, your backlog, your engineer of choice. Monthly rolling after that - no annual minimums.

Contact Us

(+84) 38 339 6560

Email

michael@sapotacorp.vn

Why work with us on custom software?

  • Senior-only engineers, embedded in your sprint
  • Modern stack - React, Node, Python, Go, mobile, infra
  • Documented code a future in-house team can own
  • From $1,800/engineer/month, 2-week paid trial
Book the trial
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Share Your Story

We build trust by delivering what we promise – the first time and every time!

We'd love to hear your vision. Our IT experts will reach out to you during business hours to discuss making it happen.

Contact Us

(+84) 38 339 6560

Email

michael@sapotacorp.vn

WhatsApp

(+84) 38 339 6560

Office

S-Building, 101 Huỳnh Tấn Phát, Hải Châu, Đà Nẵng

WHY CHOOSE US

"Collaborate, Elevate, Celebrate where Associates - Create Project Excellence"

SapotaCorp beyond the IT industry standard, we are

  • Certificated
  • Assured quality
  • Extra maintenance

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contacts

S-Building, 101 Huỳnh Tấn Phát, Đà Nẵng (+84) 38 339 6560
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Contacts(+84) 38 339 6560michael@sapotacorp.vn
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