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.
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.
What Full-Stack Developers Bring to Your Team
Full-stack developers aren't just developers who know both frontend and backend—they're engineers who understand how the entire system fits together. They can see how a database query affects API response times, how frontend state management impacts backend caching strategies, and how deployment pipelines influence development workflows. This holistic understanding makes them uniquely valuable for product development.
When you augment your team with full-stack developers, you're not just adding coding capacity—you're adding problem-solving capability. These engineers can work across the entire stack to implement features end-to-end, reducing handoffs between frontend and backend teams. They can debug issues that span multiple layers, optimize performance across the entire application, and make architectural decisions that consider the full system.
Our full-stack developers are particularly effective in agile environments where speed and flexibility matter. They can pick up a user story, implement it from database to UI, write tests, deploy it, and monitor it—all without waiting for other team members. This reduces cycle time, eliminates communication overhead, and enables faster iteration on product features.
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.
The Challenge in Detail
The fintech's existing PHP checkout system was showing its age. It couldn't handle the transaction volume they needed for growth, response times were degrading under load, and the codebase was so tightly coupled that making changes risked breaking critical payment flows. Meanwhile, they needed to maintain PCI DSS Level 1 compliance, support multiple payment methods (credit cards, bank transfers, digital wallets), and launch new features without disrupting existing merchants.
Our full-stack team approached this systematically. The staff engineer designed a microservices architecture that separated payment processing, fraud detection, and merchant management into independent services. The two full-stack developers built the new React + Next.js frontend while simultaneously implementing the Node.js backend services. The QA specialist created comprehensive test suites covering unit tests, integration tests, and end-to-end payment flows.
The key to success was progressive rollout. We used LaunchDarkly feature flags to gradually migrate merchants from the old system to the new one, monitoring error rates, response times, and transaction success rates at each stage. This allowed us to catch issues early and roll back instantly if needed—which we never had to do, because the new system performed better from day one.
"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
Technical Highlights
- Event-driven architecture with Kafka for payment processing
- PostgreSQL with read replicas for high availability
- Next.js server-side rendering for fast page loads
- Comprehensive monitoring with Datadog and Sentry
- Automated security scanning in CI/CD pipeline
- Feature flags for gradual rollout and A/B testing
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.
Onboarding: From Day One to First PR
We don't believe in long, drawn-out onboarding processes. Within the first week, your new full-stack developers will have access to your codebase, your communication tools, and your development environment. They'll participate in your team's rituals—stand-ups, sprint planning, retrospectives—from day one. By the end of week two, they'll have submitted their first pull request and be contributing to your product.
Our onboarding process includes a comprehensive engagement playbook that covers your team's working style, communication preferences, code review standards, and deployment processes. We also create a team charter that defines roles, responsibilities, and success metrics. This ensures everyone is aligned from the start and prevents misunderstandings down the road.
Communication: Transparency and Alignment
Effective collaboration requires clear communication. We use async updates in Slack or your preferred tool, shared dashboards that show progress in real-time, and weekly demos that showcase what's been built. Our engineers document their work as they go, write clear commit messages, and provide context in pull requests. You'll always know what's being worked on, what's been completed, and what's coming next.
We also track and report on DORA metrics—deployment frequency, lead time for changes, mean time to recovery, and change failure rate. These metrics give you visibility into engineering productivity and help identify areas for improvement. We don't just report these metrics—we actively work to improve them, implementing practices that increase deployment frequency, reduce lead times, and minimize failures.
Time Zone Alignment: Real-Time Collaboration
Our nearshore team works in time zones that overlap with US business hours, enabling real-time collaboration when you need it. During critical moments—sprint planning, architecture discussions, production incidents—our engineers are available for live conversations. For after-hours monitoring and support, we provide structured handoffs that ensure continuity without requiring you to be on-call 24/7.
This time zone alignment is crucial for agile development. When questions arise during development, they can be answered immediately. When code reviews are needed, they happen in real-time. When production issues occur, our engineers can jump on a call with your team to help troubleshoot. This isn't offshore development with 12-hour delays—it's true collaboration.
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
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.
If you’re interested in hiring developers for this capability in Argentina, visit the Argentina version of this page.
CONTACT US
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