Senior Backend Engineer

Mytechtree; London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading tech startup in London is seeking a Senior Backend Engineer to design and implement backend systems. The role requires extensive experience in backend development and fluency in multiple programming languages. Candidates should have a strong understanding of system design and architecture. This is a full-time position with significant scope for architectural input and hands-on implementation within a rapidly growing organization.

Qualifications

• Extensive backend development experience in complex domains.
• Fluency in 3 or more programming languages.
• Strong fundamentals in system design, software architecture, and data modelling.
• Deep experience working in complex domains like financial systems or logistics.
• Hands-on experience with relational databases, PostgreSQL preferred.
• Experience with refactoring legacy systems.

Responsibilities

• Own the design and implementation of backend systems driving workflows.
• Model domain complexity using DDD and architectural approaches.
• Shape and evolve our architecture transitioning from Java to Node.js.
• Work closely with product and operations to build features.
• Refactor and rearchitect complex codebases balancing performance and readability.
• Contribute to test automation and CI/CD pipelines.

Skills

Backend development

Programming languages (polyglot)

System design

Software architecture

Data modelling

Relational databases (PostgreSQL)

Event-driven architecture

Refactoring legacy systems

Test automation

CI/CD pipelines

Domain-Driven Design (DDD)

Command Query Responsibility Segregation (CQRS)

Behavior-Driven Development (BDD)

Job description

Overview

Join to apply for the Senior Backend Engineer role at TechTree

Seeking a Senior Backend Engineer to design and implement backend systems, model domain complexity, and shape architecture in a fast-growing startup revolutionizing global trade in drinks.

About The Company

Ferovinum is revolutionising the supply chain and financial foundations of the $800bn global drinks industry by building a platform that will change the way that commerce is executed forever. We\'ve secured our Series A funding and are part of Notion Capital\'s portfolio, with strong growth in the UK and global expansion plans.

About The Role

Seeking a Senior Backend Engineer to design and implement backend systems, model domain complexity, and shape architecture in a fast-growing startup revolutionizing global trade in drinks. This role is deeply hands-on and implementation-focused, with strong scope for architectural input. If you’re driven by complex domains, clean abstractions, and high-impact ownership, this is for you. Behind the scenes, our systems model deep commercial logic, financial rules, and real-world operations at scale.

What You’ll Do

• Own the design and implementation of backend systems driving business-critical workflows, financial calculations, and operational tooling.
• Model domain complexity using DDD and other architectural approaches across an event-driven modular monolith.
• Shape and evolve our architecture as we transition from Java to Node.js/TypeScript in a modern AWS-based environment.
• Work closely with product and operations to build features that serve external users and internal teams.
• Play a key role in refactoring and rearchitecting complex codebases, balancing performance, readability, and testability.
• Contribute to and promote test automation and CI/CD pipelines, especially for regression coverage.
• Bring system-level thinking to design discussions with a team of senior/principal engineers.

Requirements

• Extensive backend development experience in complex domains
• Fluency in 3 or more programming languages
• Strong fundamentals in system design, software architecture, and data modelling
• Deep experience working in complex domains such as financial systems, logistics, or workflow-heavy platforms
• Hands-on experience with relational databases (PostgreSQL preferred)
• Comfortable working in an event-driven, modular monolith environment
• Experience with refactoring legacy systems and shaping technical direction
• Familiarity with DDD, CQRS, BDD, or similar techniques
• Background in finance, accounting, logistics, or regulated domains
• Strong test automation experience, especially in CI/CD and end-to-end testing contexts

Required Skills

• Backend development
• Programming languages (polyglot)
• System design
• Software architecture
• Data modelling
• Relational databases (PostgreSQL)
• Event-driven architecture
• Refactoring legacy systems
• Test automation
• CI/CD pipelines
• Domain-Driven Design (DDD)
• Command Query Responsibility Segregation (CQRS)
• Behavior-Driven Development (BDD)

Team members

• senior/principal engineers

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering and Information Technology
• Industries
• Software Development