Sameer Ahmed

Senior Full-Stack & AWS Engineering Leader

I ship venture-ready platforms that scale from first customer to Series B—reliably.

Seven years leading high-stakes builds for YC founders, insurance marketplaces, and fintech teams. Type-safe full‑stack engineering and AWS architecture focused on uptime, speed, and measurable outcomes.

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Current Mandates

Ledger Investing — modernizing specialty insurance underwriting and pricing
IDA.eu — scaling travel operations tooling across six European hubs
YC fintech founders — shipping a compliance-ready platform in under 90 days

AWS, done right

Multi-account AWS landing zones with automated guardrails and audit trails
CI/CD pipelines via GitHub Actions, CodePipeline, and ArgoCD for safe rollouts
Observability stacks using OpenTelemetry, Datadog, and native CloudWatch insights
Cost-aware architectures balancing serverless, spot fleets, and Graviton workloads

Years leading full-stack product delivery

Venture-backed launches delivered end-to-end

$420M

Capital raised by teams I have supported

99.95%

Average uptime across managed workloads

Case Studies

Outcomes for venture-backed teams shipping regulated and high-trust products.

Request the full portfolio

Ledger InvestingPrincipal Full-Stack Engineer (Fractional)

Brought in to unify underwriting, pricing, and analytics into a platform brokers and carriers can trust.

Highlights

Orchestrated a secure multi-region AWS architecture spanning VPC networking, EventBridge, and Step Functions
Rebuilt broker-facing experiences with Next.js, tRPC, and design system guardrails for rapid iteration
Introduced infrastructure-as-code with AWS CDK, golden pipelines, and staged releases with feature flags

Results

Cut quoting cycle time by 45% while eliminating weekend fire drills
Enabled the team to close their Series B round with enterprise-readiness proof

Stack

Next.jsTypeScriptAWS CDKEventBridgePostgreSQLDatadog

IDA.euLead Platform Consultant

Partnered with operations and product to transform a paper-heavy logistics business into a resilient SaaS platform.

Highlights

Decomposed a monolith into service boundaries backed by GraphQL federation and serverless functions
Deployed a geo-aware content pipeline using S3, Lambda@Edge, and DynamoDB streams
Embedded experiment frameworks for pricing using feature toggles and warehouse feedback loops

Results

Improved booking conversion by 32% across primary markets
Expanded platform coverage to four new countries without downtime

Stack

ReactNestJSGraphQLAWS LambdaStep FunctionsSnowflake

YC Portfolio (Stealth Fintech)Fractional Head of Engineering

Guided a seed-stage team from prototype to compliance-ready launch serving regulated financial partners.

Highlights

Implemented SOC2-aligned controls with Terraform-managed AWS Organizations and IAM guardrails
Built automated risk scoring pipelines using Python, Kafka, and serverless batch processing
Coached the internal team on delivery rituals, code quality, and observability best practices

Results

Shipped the first enterprise contract in 11 weeks with zero P0 incidents
Secured follow-on Series A financing backed by reliability metrics

Stack

TerraformAWS OrganizationsPythonKafkaReactCircleCI

PrimeLayerPrincipal Full-Stack Engineer (Fractional)

SaaS builder for structured data systems — designed internal backend and AI‑assisted frontend builder powering 10+ active organizations.

Highlights

Defined multi-tenant architecture, access controls, and data modeling foundations
Built AI‑assisted UI builder enabling non-engineers to compose workflows

Results

Adopted by 10+ organizations with faster iteration on internal tools

Stack

Next.jsTypeScriptAWSPostgreSQL

Viste AILead Architect

AI SaaS platform for retail computer vision — built from scratch, architected cloud APIs, optimized inference pipeline, and launched MVP in 6 weeks.

Highlights

Architected cloud APIs and data pipelines for ingestion and inference
Optimized on-demand inference with cost-aware execution and caching

Results

Launched MVP in 6 weeks with a clear path to scale

Stack

ReactTypeScriptPythonAWS

ArtifactXLead Engineer

NFT marketplace and smart contract ecosystem — handled full-stack Web3 architecture, event-based indexer, and AWS-based metadata pipeline.

Highlights

Led core engineering team; built event-based indexer to track on-chain activity
Built metadata processing pipeline on AWS for reliable refreshes

Results

Revenue during beta with stable on-chain indexing
5% equity stake for engineering leadership

Stack

Next.jsTypeScriptAWS

Cryft NetworkBlockchain Infrastructure & Security (Contract)

High-trust blockchain engagement focused on securing live crypto infrastructure.

Highlights

Rebuilt production website, Node.js backend, and integrated smart-contract APIs
Hardened deployments against common on-chain exploits with zero downtime

Results

Maintained zero downtime during security hardening

Stack

Next.jsNode.jsSolidityEthers.jsHardhatAWS

Oliva HealthSenior Engineer (Fractional)

Mental health startup (Series B) — migrated legacy Webflow to Next.js + Prismic, implemented SEO-focused content delivery and analytics integration.

Highlights

Migrated marketing platform to Next.js + Prismic with preview flows
Implemented SEO-first rendering and analytics instrumentation

Results

Improved editorial velocity with safer, measurable releases

Stack

Next.jsTypeScriptPrismicVercel

Services

Fractional leadership with hands-on delivery when the roadmap is too important to stall.

Full-Stack Product Leadership

Fractional engineering leadership owning roadmap, architecture, and delivery.

Translate ambitious founder goals into measurable product increments
Ship hands-on across Next.js, Node.js, Python, and modern front-end stacks
Institutionalize code review, release cadences, and engineering playbooks

AWS Architecture & Operations

Design and operate resilient, cost-aware cloud infrastructure.

Multi-account landing zones, network segmentation, and compliance guardrails
Infrastructure as code with Terraform or AWS CDK plus automated drift detection
Observability with OpenTelemetry, Datadog, and pragmatic incident response loops

Delivery Acceleration & Pipelines

Modernize CI/CD so teams can ship confidently several times a day.

Opinionated pipelines using GitHub Actions, CodeBuild, and ArgoCD
Progressive delivery strategies including feature flags and canary releases
Developer experience workflows: automated QA, preview environments, quality gates

Operating Principles

Technical leadership anchored in clarity, measurement, and enablement.

Design for auditability

Versioned infrastructure, automated change records, and compliance artifacts from day one.

Data-driven iteration

Telemetry-first decisions, experimentation platforms, and customer feedback loops built into the roadmap.

People enablement

Pairing, documentation, and rituals that leave internal teams stronger than when I arrived.

Way of Working

Proven delivery rhythm that keeps momentum high and surprises low.

01 / Discovery & Alignment

Immersive workshops with founders, product, and operations to map constraints, compliance, and success metrics.

02 / Architecture Blueprints

Collaborative architecture artifacts with C4 diagrams, AWS reference stacks, and decision records to de-risk execution.

03 / Delivery & Enablement

Lead sprints, pair with internal engineers, and ship vertical slices weekly with automated quality gates.

04 / Reliability & Growth

Operational handover, runbooks, observability dashboards, and hiring support to sustain momentum.

Tooling & Stack

Modern, pragmatic tooling that scales with your team.

I meet teams where they are, then evolve the stack with automation and observability so releases stay boring and customer impact stays loud.

Next.js 15, React 19, Remix

TypeScript, Python, Go

PostgreSQL, DynamoDB, Snowflake

EventBridge, Step Functions, Kafka, SQS

Terraform, AWS CDK, Pulumi

GitHub Actions, CircleCI, ArgoCD

Datadog, New Relic, OpenTelemetry

Storybook, Design Systems, Accessibility

Founder Voices

Trusted by repeat founders and venture-backed teams.

"Sameer gave us the confidence to speak to enterprise clients. Infrastructure, product velocity, and team rituals leveled up fast."

Paul M.CEO, Ledger Investing

"He translated legacy chaos into a crisp roadmap and delivered it. Series A diligence became the easiest part of our raise."

Laura F.Chief Product Officer, IDA.eu

"We got a fractional CTO who still wrote the tough code. Compliance, pipelines, and customer trust followed quickly."

YC FounderStealth Fintech (Series A)

Let's Build

Ready for your launch or scale chapter? Let's architect it together.

Tell me about the product you are building, where the risk sits today, and the traction you need in the next two quarters. I will respond within one business day with next steps.

Email: hello@sameer.build

Based in: Remote across EU & North America

Engagements: Fractional leadership, build squads, architecture audits