Senior Software Developer (Full-stack, Backend-focused)

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

Role Overview

Responsibilities

Developing VPN and eSIM Product Logic:

• implement features for issuing, renewing, and activating eSIM profiles, as well as managing access to VPN servers, user sessions, and subscription plans.

Telecom and Loyalty Vendor Integrations:

• work with the API telecom provider (Telna) to manage data plans and usage, and integrate with Voucherify for promo codes, discounts, and referral programs.

Integrating External Services and APIs:

• design and implement integrations with infrastructure services and external product services.

Backend Feature Development and Maintenance:

• develop product logic, handle webhooks from external providers, and maintain existing codebases using NestJS.

Developing Product and User Flows:

• build end-to-end user journeys across the backend and frontend using React, Next.js, and NestJS — from eSIM plan selection to activation.

Website Development and Enhancement:

• develop and maintain the company's product website, user account portal, and product conversion funnels.

Incident Investigation and System Monitoring:

• analyze logs, investigate service activation failures and analytics delivery issues, and configure monitoring and alerting using Datadog.

Architecture and Code Reviews:

• contribute to architectural design, technical planning, and code reviews.

Testing and Technical Debt:

• improve test coverage for new code and technical debt by writing E2E and unit tests.

Mentoring:

• mentor junior developers, share knowledge, and support their onboarding and integration into the team.

What We Expect from You

• 5+ years of commercial software development experience in Middle+ or Senior roles, with a strong backend focus;

• expert knowledge of NestJS, TypeScript, and Node.js, along with experience in modern frontend development using React and Next.js;

• product integration experience: hands-on experience working with external vendors' REST APIs;

• quality and reliability: practical experience writing E2E, integration, and unit tests, investigating incidents, and working with monitoring systems such as Datadog and Grafana;

• databases and infrastructure stack: experience with PostgreSQL, Redis, and Docker, including optimizing complex SQL queries and designing high-load architectures.

Soft skills:

• technical leadership and mentoring: willingness to mentor junior developers, conduct regular code reviews, and foster a strong engineering culture within the team;

• structured thinking and product mindset: ability to independently break down ambiguous business requirements, propose optimal architectural solutions, and deliver them to production;

• autonomy and responsibility: ability to take full ownership of a technical domain and be responsible for service stability and performance;

• excellent communication skills: ability to collaborate effectively with the Product Managers, Marketers, Designers, and adjacent Engineering teams.

Nice to have:

• architectural patterns: practical experience with CQRS and event-driven architecture;

• сloud and DevOps: experience with AWS (ECS, RDS, SQS, Lambda, S3, CloudFront) and monitoring and tracing systems such as Datadog;

• domain expertise: experience in telecom, VPN, eSIM, or working with mobile network operators;

• loyalty and discount systems: experience integrating with solutions such as Voucherify or designing custom services for promo codes, referral programs, and user retention mechanics;

• security and high load: understanding of fundamental network security principles, including TLS and cryptography, and practical experience designing fault-tolerant, highly available systems.

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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