Senior Backend Developer - Node.js / TypeScript (m/f/x)

osapiens; Madrid; Híbrido; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A leading tech company is seeking a Senior Backend Developer to join their team in Madrid. In this role, you'll design and optimize backend features using Node.js and TypeScript, contributing to innovative software solutions. The position offers a hybrid work model, allowing you to balance in-person collaboration with remote flexibility. Ideal candidates will have strong backend development experience and excellent English communication skills.

Servicios

Purpose-driven mission

Flexible hybrid work options

Collaborative teamwork

Growth opportunities

Fun team events

Formación

• Strong experience in backend development focusing on Node.js and TypeScript.
• Expertise in developing web services and integrations.
• Ability to work in agile sprints and participate in team activities.

Responsabilidades

• Design and optimize backend features for scalability and maintainability.
• Collaborate with agile squads to implement features.
• Mentor and support junior developers.

Conocimientos

Backend development with Node.js

TypeScript expertise

Web services development (REST, GraphQL)

Git version control

Agile experience

Excellent communication skills in English (C1)

Descripción del empleo

Senior Backend Developer - Node.js / TypeScript (m/f/x)

Department: Business Partner Transparency

Employment Type: Permanent - Full Time

Location: Madrid

Description

As a Senior Backend Developer, you’ll play a key role in shaping the future of Business Partner Transparency (BPT) within our osapiens HUB. This enterprise-grade platform helps companies comply with critical ESG regulations like:

• The German Supply Chain Due Diligence Act (LkSG) – ensuring suppliers uphold human rights and environmental standards.
• The Whistleblower Directive – providing secure, anonymous reporting channels.
• The Corporate Sustainability Due Diligence Directive (CSDDD) – upcoming EU-wide sustainability compliance.

Our osapiens HUB is a modern, enterprise-grade development platform that enables businesses to build powerful applications without worrying about infrastructure, scaling, or failover. You’ll help develop and refine this cutting-edge, serverless ecosystem while delivering meaningful solutions for international clients.

This role is based in Mannheim, where you'll collaborate with a talented, forward-thinking team. We embrace a hybrid work model, with three days a week in the office, ensuring the perfect balance between in-person collaboration and remote flexibility.

Key Responsibilities

• Design, build, and optimize backend features using modern front-end and back-end technologies, ensuring scalability and maintainability.
• Develop and enhance innovative software solutions that automate complex compliance workflows for businesses of all sizes.
• Collaborate closely with product managers, designers, and engineers in small, agile squads (5-7 people) to define, refine, and implement features.
• Ensure high-quality, secure, and efficient code through rigorous reviews, automated testing, and continuous integration/deployment (CI/CD) practices.
• Own the architecture and design of solutions, optimizing for performance, reliability, and user experience.
• Contribute to technical strategy and decision-making, identifying opportunities for innovation and process improvements.
• Mentor and support junior developers, fostering a culture of learning and technical excellence within the team.

Skills, Knowledge and Expertise

• Strong experience in backend development with a focus on Node.js and TypeScript.
• Expertise in web services development and integration (REST, GraphQL, etc.).
• Familiarity with Git for version control and collaboration.
• Strong product mindset – you think beyond code, considering user experience, business impact, and scalability.
• Agile experience – comfortable working in sprints, participating in stand-ups, and iterating quickly.
• Excellent communication skills in English (C1). German is a bonus, but not necessary.

Benefits

• A purpose-driven mission with and for global industry pioneers in tackling complex challenges
• Room for creativity through collaborative teamwork and an open communication culture
• Flexibility and team bonding with our hybrid work options
• Fuel for your growth journey, both personally and professionally
• Sustainable mobility options, promoting eco-friendly commuting solutions
• Fun team events and outings with our global teams
• Inspiring workspaces in Mannheim and beyond