Senior Software Engineer

Coltech; Deutschland; Remote; EUR 83,000 - 138,000; Full time

Job summary

Coltech is seeking a skilled Full Stack Software Engineer for a fully remote 6-month contract based in Germany. You will design, develop, and maintain scalable full stack applications using React, TypeScript, and Node.js, while building robust backend services and REST APIs.

You will work across the full SDLC, collaborate with product managers, and contribute to CI/CD pipelines and cloud deployments. The role requires strong front-end and back-end expertise, experience with microservices,

Qualifications

• Experience with React and TypeScript.
• Strong front-end development and responsive UI skills.
• Backend service development with Node.js and REST APIs.
• Experience with microservices architecture.

Responsibilities

• Design, develop, and maintain full stack applications using React, TypeScript, and Node.js.
• Build responsive and accessible user interfaces.
• Develop backend services, REST APIs, and microservices to support applications.
• Collaborate with cross-functional teams to translate requirements into technical solutions.
• Contribute to CI/CD pipelines and DevOps practices.

Skills

React

TypeScript

Node.js

REST APIs

Microservices

Cloud platforms

CI/CD

Tools

Docker

Kubernetes

Terraform

Job description

Industry: Financial Technology (FinTech)

Technology Stack: React, TypeScript, Node.js, REST APIs, Microservices, Cloud Platforms

About the Role

We are seeking an experienced Full Stack Software Engineer to join the engineering team of a fast-growing FinTech business developing innovative, scalable, and secure financial technology solutions.

This is an excellent opportunity for a technically strong engineer with expertise in modern front-end and backend development to contribute to the design, development, and delivery of high-quality software applications within a dynamic financial services environment.

The successful candidate will work across the full software development lifecycle, building responsive user interfaces, developing robust backend services, integrating APIs, and helping scale cloud-based applications. You will collaborate with engineers, product managers, and other stakeholders to deliver reliable, maintainable, and secure solutions that support business growth and evolving customer requirements.

This is a fully remote, 6-month contract opportunity for candidates based in Germany, with an immediate start available.

Key Responsibilities

• Design, develop, and maintain scalable full stack applications using React, TypeScript, and Node.js.
• Build responsive, accessible, and high-performance user interfaces in line with modern front-end development standards.
• Develop and maintain backend services, RESTful APIs, and microservices to support business-critical applications.
• Design and implement scalable software architectures that support performance, reliability, and future growth.
• Integrate internal services, third-party APIs, and external platforms into existing applications.
• Work with SQL and NoSQL databases, ensuring efficient data storage, retrieval, consistency, and performance.
• Develop and deploy applications within cloud environments such as AWS, Google Cloud Platform (GCP), or Microsoft Azure.
• Implement automated testing, including unit, integration, and end-to-end testing where appropriate.
• Contribute to CI/CD pipelines, automated deployment processes, and modern DevOps practices.
• Ensure applications meet high standards of security, performance, availability, and maintainability.
• Apply secure coding practices when handling sensitive financial information and customer data.
• Troubleshoot technical issues, identify performance bottlenecks, and support production systems.
• Participate in code reviews, technical design sessions, sprint planning, and agile development ceremonies.
• Collaborate with cross-functional teams to translate business requirements into effective technical solutions.
• Take ownership of assigned features and projects from initial design through development, testing, deployment, and maintenance.
• Contribute to technical documentation, engineering standards, and continuous improvement initiatives.

Essential Skills and Experience

Front-End Development

• Strong commercial experience developing applications using React and TypeScript.
• Experience building reusable components and maintainable front-end architectures.
• Understanding of state management, API integration, responsive design, and front-end performance optimisation.
• Ability to deliver intuitive and reliable user experiences.
• Strong commercial experience with Node.js and backend application development.
• Proven experience designing, building, and maintaining REST APIs.
• Experience developing and maintaining microservices or distributed applications.
• Good understanding of authentication, authorisation, API security, and error handling.
• Strong knowledge of software design principles, data structures, and clean coding practices.

Cloud and DevOps

• Experience working with at least one major cloud platform: AWS, GCP, or Azure.
• Understanding of CI/CD pipelines, automated builds, testing, and deployments.
• Familiarity with Git and collaborative source control workflows.
• Knowledge of application monitoring, logging, troubleshooting, and production support.
• Experience with Docker, Kubernetes, or infrastructure-as-code tools would be beneficial.

Databases

• Strong understanding of SQL databases and relational data modelling.
• Experience with NoSQL databases and document-oriented or key-value data stores.
• Knowledge of database optimisation, indexing, query performance, and data integrity.
• Ability to select appropriate data storage solutions based on application requirements.

Testing and Software Quality

• Experience implementing automated testing strategies.
• Knowledge of unit, integration, and end-to-end testing frameworks.
• Understanding of test-driven development and continuous