Hire Full-Stack Developers

Augment your team with battle-tested full-stack developers who think beyond tickets. We join your rituals, de-risk architecture decisions, and keep product, design, and infrastructure aligned as we ship.

Our nearshore squad works in your time zone overlap and speaks the language of modern stacks—React, Next.js, Node.js, Python, TypeScript, PostgreSQL, Kubernetes. You get clean releases, measurable impact, and teammates who document as they deliver.

  • Prototype new customer experiences without slowing maintenance work.
  • Refactor legacy services into cloud-ready components while shipping features weekly.
  • Surface engineering KPIs your leadership cares about—lead time, change failure rate, uptime.

Need to modernize a legacy monolith while shipping new features? That’s our sweet spot. We balance customer timelines with sustainable engineering and keep you looped in with real progress, not vanity updates.

Hire full-stack developers – team with full-stack icons

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Full-Stack Staff Augmentation Services

We embed seasoned engineers who own outcomes alongside your team. They’re comfortable context-switching between frontend polish and backend resilience, and they leave your codebase healthier than they found it.

  • Product feature squads: design GraphQL/REST APIs, ship Next.js interfaces, wire analytics, and hand over documentation.
  • Legacy modernization: split monoliths, introduce clean architecture, and migrate safely without a feature freeze.
  • Platform reliability: instrument observability, performance budgets, and security reviews based on the OWASP Top 10.
  • Data-heavy workflows: model schemas, author ETL jobs, and surface dashboards users actually understand.
  • DevOps alignment: build pipelines, containerize apps with Kubernetes, and deploy to AWS, Azure, or GCP with blue/green safety nets.

Example engagement: we recently helped a B2B marketplace refactor a Node.js monolith into modular services while rolling out a redesigned React UI—achieving a 38% faster checkout and zero downtime launches.

Full-stack icons collage for staff augmentation

Case study: rebuilding payments for a fintech scale-up

A Latin American fintech needed to replace a brittle PHP checkout while meeting PCI compliance and aggressive go-live dates. We deployed a cross-functional pod—two senior full-stack developers, a staff engineer overseeing architecture, and a part-time QA automation specialist.

  • Stack: React + Next.js, Node.js event-driven services with Kafka, PostgreSQL, Terraform, LaunchDarkly for controlled rollouts.
  • Timeline: discovery (2 weeks), architecture and proof of concept (4 weeks), iterative delivery with progressive rollouts (8 weeks), enablement and handover (2 weeks).
  • Impact: card-approval rates improved 11%, average response time dropped from 820ms to 240ms, and the new onboarding wizard increased merchant activations by 23% while keeping PCI auditors satisfied.
  • Collaboration: we paired daily with the client’s compliance officer, left threat models mapped to OWASP findings, and recorded teardown sessions so their internal team could extend the platform confidently.

Differentiator: our engineers owned both product experiments and platform reliability—designing feature flags, post-release dashboards, and playbooks that the client’s staff now use to ship every new payment capability.

“Siblings Software brought focus and empathy. They challenged our assumptions, delivered every milestone, and left us with dashboards that finally make sense to leadership.”

Head of Engineering, Fintech Series B

Industries we accelerate

Fintech & payments

Build compliant onboarding, reconcile transactions in real time, and keep auditors happy with clear runbooks.

Recent win: delivered PSD2-ready APIs and observability dashboards in 10 weeks.

SaaS & analytics

Ship product-led growth features, unify event pipelines, and reduce dashboard latency without pausing roadmap work.

Recent win: consolidated three data sources, enabling self-serve reporting for 4,000 accounts.

Ecommerce & marketplaces

Optimize performance across storefronts, automate catalog ingestion, and personalize experiences with privacy in mind.

Recent win: reduced cart abandonment by 18% after deploying edge rendering and feature flags.

We also support healthtech and climate-tech products, coordinating with legal and compliance partners when extra certifications are required.

Engagement snapshots

Every partnership looks different. Here are three examples of how we plug into teams and drive outcomes without derailing existing roadmaps.

Experiment runway

Two full-stack developers paired with a product manager to test pricing experiments in a React + Node.js SaaS product. Outcome: three A/B launches in six weeks and a 9% lift in conversions, with clean feature flags ready for production rollout.

We maintained the core team’s release cadence and left dashboards that report on experiment ROI.

Legacy to cloud migration

A retailer asked us to disentangle a PHP monolith into services running on AWS Fargate. We introduced a strangler pattern, automated regression tests, and delivered observability via Grafana.

Result: deployment frequency tripled and operational costs dropped 17% without a feature freeze.

Analytics hardening

For a media company, we stabilized a data pipeline using Apache Airflow and TypeScript services. The team also rebuilt the customer dashboard in Next.js with cached views for sub-second reports.

Outcome: error rates fell by 82% and marketing finally trusted a single source of truth for campaign reporting.

Who we plug into your roadmap

Product-minded full-stack devs

Own user stories end-to-end, collaborate with designers, and monitor releases using tools like Datadog and Sentry.

Technical leads & solution architects

Facilitate architecture decisions, coach the team, and drive ADRs that keep your system future-ready.

QA automation & DevOps partners

Write Cypress/Playwright suites, maintain CI/CD, and ensure your environments stay compliant.

Need a larger multi-disciplinary squad? We can add scrum masters, UX writers, or data engineers and keep everyone moving as one unit.

How collaboration works

  • Fast onboarding: engagement playbook, team charter, and first PR within 7 business days.
  • Communication: async updates, shared dashboards, and weekly demos aligned with DORA metrics.
  • Time zones: real-time overlap with US hours plus structured handoffs for after-hours monitoring.
  • Knowledge transfer: living documentation, ADRs, and pairing sessions so your team stays self-sufficient.

Unlike traditional outsourcing vendors, we co-own the roadmap. Our engineers join backlog refinement, help product managers weigh trade-offs, and surface technical debt with business context so prioritization stays grounded in outcomes.

Delivery playbook

01. Discovery & guardrails

We align on objectives, success metrics, and risks. Expect architecture sketches, security considerations, and a jointly owned roadmap before the first sprint kicks off.

02. Delivery rhythm

Two-week sprints with async status notes, live demos, and backlog grooming. We log assumptions, debt, and experiment outcomes so decisions stay transparent.

03. Reliability gates

Before launch we run performance tests, security scans, and resilience drills mapped to the AWS Well-Architected Framework or your preferred checklist.

04. Transition & enablement

We deliver documentation, recorded walkthroughs, and optional shadowing sessions. If you need ongoing support, we spin up a lightweight retainer.

Tooling & accelerators we bring

Engineering productivity

Storybook, Chromatic visual testing, GitHub Actions reusable workflows, Dependabot guardrails.

Quality & observability

Playwright/Cypress suites, Pact contract testing, Grafana dashboards, Sentry alert hygiene.

Knowledge sharing

Miro discovery boards, Loom engineering notes, internal handbooks patterned after the 12-Factor App principles.

Already have preferred tooling? We plug into it and leave improvements that stick after we transition ownership. Need frontend-only support? Explore our web developers or JavaScript developers teams.

FAQs

We usually present vetted profiles within 3–5 days. Once you select the engineers, onboarding and first delivery happen within the next 7 business days, backed by our documented onboarding checklist.

Yes. We follow SOC 2-friendly processes, maintain least-privilege access, and document deployment pipelines so audits are painless. NDA and background checks are part of our standard onboarding for sensitive environments.

Absolutely. We partner with product to ship experiments, while our engineers reinforce automated testing, observability, and rollback plans so you can move fast without fire drills.

We join discovery calls, review Figma files with designers, and co-create acceptance criteria with product managers. Every sprint ends with a demo, so stakeholders always know what shipped and what’s next.

We plan a structured handover: documentation, recorded walkthroughs, backlog grooming, and optional shadowing. If you want to keep one or two engineers on retainer, we can do that too.

OUR STANDARDS

Full-stack craftsmanship, no shortcuts.

We write code that ages well. That means peer reviews, measurable quality gates, and architecture decisions that favor long-term clarity over short-term hacks. Every PR contains context, tests, and a rollback plan.

Transparency matters. You’ll see cycle times, DORA metrics, and roadmap progress in the same dashboards we use to run the team. And when it’s time to transition ownership, we leave playbooks that keep your product shipping after we roll off.

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If you’re interested in hiring developers for this capability in Argentina, visit the Argentina version of this page.

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