Recharge SMS

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Embedded platform engineering

Core Capacities

Focus: 10M+ users, zero disruption

Project Focus

September 2025

Year

Overview

Rearchitecting SMS at Subscription Scale

Rearchitecting SMS at Subscription Scale

Rearchitecting SMS at Subscription Scale

Recharge is the leading subscription platform for e-commerce brands, managing recurring billing, customer self-service, analytics, and retention for thousands of merchants. After acquiring the team and technology behind Recharge SMS — a product that lets brands manage subscriptions via text — the company needed to rearchitect the service for the demands of a platform operating at tens of millions of users before it could be fully integrated into the core product.

Recharge is the leading subscription platform for e-commerce brands, managing recurring billing, customer self-service, analytics, and retention for thousands of merchants. After acquiring the team and technology behind Recharge SMS — a product that lets brands manage subscriptions via text — the company needed to rearchitect the service for the demands of a platform operating at tens of millions of users before it could be fully integrated into the core product.

Recharge is the leading subscription platform for e-commerce brands, managing recurring billing, customer self-service, analytics, and retention for thousands of merchants. After acquiring the team and technology behind Recharge SMS — a product that lets brands manage subscriptions via text — the company needed to rearchitect the service for the demands of a platform operating at tens of millions of users before it could be fully integrated into the core product.

1

The Challenge

The Challenge

The Challenge

The SMS service needed to be rebuilt for performance and stability at high message volume and high concurrency. But the internal engineering team was fully committed to the core product roadmap, and pulling engineers off it to absorb a major refactor would have cost significant velocity at exactly the wrong time. The problem required senior-level capacity without management overhead — someone who could embed, do the work, and hand it back cleanly.

2

The Solution

The Solution

The Solution

Sierra embedded a Staff Engineer directly with Recharge's team for 18 months to own the refactor end-to-end. Working inside Recharge's existing workflows, standards, and tooling, Sierra's engineer rearchitected the SMS service for performance and stability under high-volume loads, then delivered the bug fixes and feature extensions required for full integration into the core platform. The in-house team retained complete ownership of the core roadmap throughout.

3

Implementation Highlights

Implementation Highlights

Implementation Highlights

• Rearchitected the SMS service from the ground up for performance and stability at 10M+ user scale and high message concurrency. • Delivered bug fixes and feature extensions required for full integration into Recharge's platform ecosystem. • Embedded directly within the in-house engineering team, operating inside existing workflows, standards, and review processes. • Maintained clean documentation and handoff materials so internal engineers owned and understood everything built.

4

Results

Results

Results

The new Recharge SMS service exceeded performance targets and is now a core pillar of the company's subscription retention functionality. The in-house team stayed focused on the core product roadmap without disruption from start to finish. Product velocity was maintained, and Recharge gained a fully integrated, high-performance SMS capability without diverting internal engineering resources to a refactor that wasn't in their roadmap.

Let's Build Together.

Let's Build Together.

Let's Build Together.

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