Senior/Lead Fullstack Developer (Billing)

Toggle is a product company building eSIM and VPN solutions for global connectivity across all major platforms, including mobile, desktop, and TV.

Role Overview

We are looking for a Senior Full-Stack Developer to join our Billing team and grow into a Lead role within 3–6 months.

You will take full technical ownership of Billing, including web payments (Stripe, Solidgate), subscription logic, and integrations with marketing and analytics platforms such as Voluum, Google Analytics, Meta, and others.

We are looking for someone who can build and improve technical processes within the team, lead and support developers, and represent the Billing team on technical topics when working with other departments.

This is a hands-on role. Currently, the team has one Full-Stack Developer, so a significant part of your time will be focused on development — from backend work with NestJS and TypeScript to payment flows on the frontend with React and Next.js.

Responsibilities

Technical Leadership & Ownership

• take full technical ownership of the Billing domain, including architecture, quality, stability, releases, and technical debt across payment, subscription, and analytics infrastructure;

• build and improve technical processes within the team, including coding and code review standards, testing, releases, incident management, task estimation and breakdown, and technical documentation;

• lead and mentor developers in the team: assign and prioritize tasks, run 1:1 meetings, evaluate performance, and take part in hiring and onboarding;

• work closely with the Product Manager on delivery estimates, risks, the technical roadmap, and technical debt priorities;

• make key architectural decisions and perform code reviews;

• work with other teams and departments, including Marketing, other Web teams, QA, Finance, and Support, as well as payment providers, on Billing-related technical topics.

Hands-on Development

• develop and maintain payment integrations with Stripe and Solidgate, including checkout, recurring payments, webhooks, and payment issue troubleshooting;

• develop and improve subscription logic, including renewals, upgrades, cancellations, refunds, and access management;

• integrate marketing analytics systems such as Voluum, Google Analytics, Meta CAPI, and Amplitude, and ensure events and data are tracked correctly;

• integrate with external services and APIs;

• develop new backend features and maintain existing code using NestJS;

• develop and maintain payment flows across the frontend and backend using React, Next.js, and NestJS;

• build and improve marketing web funnels;

• develop and maintain websites using headless CMS platforms such as Strapi and Payload;

• investigate payment and analytics incidents using logs and monitoring tools such as Datadog;

• write E2E and unit tests for new features and improve test coverage as part of technical debt work.

What We Expect from You

Nice to have:

• experience with AWS (ECS, RDS) and Datadog;

• experience with affiliate and tracking platforms such as Affise, Everflow, AppMagic, or similar;

• experience working with subscription-based products;

• people management experience, including 1:1 meetings, performance reviews, and hiring developers;

• experience building development processes from scratch in a small team.

Perks

• official employment and a competitive salary;

• paid vacation+5 personal days per year;

• support for growth: we cover professional courses, books, and conferences;

• private health insurance (including dental coverage);

• internal English classes;

• fast skill growth in a startup-paced environment;

• a culture of openness, respect, and honest feedback;

• minimal bureaucracy — maximum impact and momentum.

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