Senior Software Engineer (Full Stack)

Ocean Infinity; Greater London; On-site; GBP 36,000 - 60,000; Full time

Job summary

Ocean Infinity seeks a Senior Software Engineer to design, build, and maintain the products behind our autonomous and remote marine operations. You will work from data models and APIs through to operator and customer interfaces, reporting to a Tech Lead.

The role involves fullstack development across C#/.NET or TS stack, React frontends, and collaboration with engineers to ensure robust, scalable systems.

Qualifications

• Degree in Computer Science, Information Technology, or related field.
• 5+ years as software engineer with production experience on backend and frontend.
• Strong backend fundamentals: REST, clean architecture, design patterns; experience in C#/.NET or Node/TypeScript.

Responsibilities

• Design, build, and maintain fullstack web applications from DB/API to UI.
• Write production backend services in C#/.NET or TypeScript/Node.
• Build React UIs (Next.js on TypeScript products).
• Manage relational DB schemas, queries, migrations.
• Integrate real-time data flows and robotics-to-web pipelines.
• Use AI-assisted development tools in daily workflow.
• Follow and improve development and quality practices.
• Mentor junior engineers through guidance and feedback.

Skills

5+ years experience

C#/.NET

Node/TypeScript

React

PostgreSQL/SQL Server

Entity Framework Core/Prisma/Drizzle

TypeScript

Git

OWASP security basics

English fluency

Autonomous work

REST API design

Design patterns

Single-page web apps

Education

Degree in Computer Science or related

Tools

Docker

Kubernetes

CI/CD pipelines

Azure/AWS/GCP

WebSockets/SignalR

tRPC/Next.js

Job description

Worker Type

Employee

Application End Date

28-08-2026

We are using and creating technology to transform operations at sea to enable people and the planet to thrive.

We are open-minded and fearless in our approach to innovation and don't believe in boundaries. We challenge everything and have massive ambitions to drag aging industries into the tech era.

We take safety, equality and education very seriously, and our responsibilities don't stop at our front door. Our business is built on the belief that there's definitely a more environmentally responsible way to operate at sea.

We employ people who share our core values. We expect our people to be courageous, trustworthy, and conscientious, driven by a desire to do the right thing. We strive for excellence, work collaboratively, and are genuinely excited by our work.

We offer opportunities for our people to develop beyond their role and span a multitude of disciplines. These are open to all, regardless of background and experience level. Working with us means being part of a team that is harnessing technology and creativity to disrupt a traditional industry.

We are not your average workplace.

Ocean Infinity is seeking a talented Senior Software Engineer who is strong across the stack and grounded in solid backend engineering. You will design, build, and maintain the products behind our autonomous and remote marine operations, working from data model and API through to the interfaces our operators and customers rely on. The role reports to a Tech Lead and is a key contributor within the team, providing technical expertise and guidance to fellow engineers.

Our products run on more than one stack. Depending on where you work, that is C#/.NET with a React frontend, or our TypeScript stack (Next.js, tRPC, Node, Postgres). We care more about the strength of your engineering than the specific framework.

What Will You Do

• Design, build, and maintain fullstack web applications, from database and API design through to responsive, performant user interfaces;
• Write production backend services grounded in sound design patterns, whether in C#/.NET or TypeScript/Node;
• Build user interfaces in React (and Next.js on our TypeScript products);
• Design and manage relational database schemas, queries, and migrations;
• Integrate systems and real-time, event-driven data flows, including robotics-to-web pipelines;
• Use AI-assisted development tools (such as Cursor or Claude) as part of your everyday workflow;
• Follow development and quality best practices, and be critical when you believe they can be improved;
• Take responsibility for sound technical engineering decisions across the stack;
• Document software and processes as needed;
• Mentor junior engineers through guidance and constructive feedback.

Who You Are (required)

• Degree in Computer Science, Information Technology, or related;
• Preferably 5+ years as a software engineer, with production experience building both backend services and web frontends;
• Strong backend fundamentals: Clean Architecture, design patterns, and REST API design, with hands-on experience in C#/.NET or Node/TypeScript;
• Proven experience building single-page web apps with React;
• Solid experience with relational databases (PostgreSQL and/or SQL Server) and an ORM (Entity Framework Core, Drizzle, Prisma, or similar), including schema and migration management;
• Proficiency with TypeScript;
• Proficiency with Git and collaborative versioning workflows;
• Familiarity with basic web application security concepts (authentication, authorization, OWASP);
• Fluency in English, spoken and written;
• Ability to take ownership and work autonomously with little supervision;
• Excellent time management and the ability to prioritise in a fast-paced environment;
• Critical thinking and initiative.

Desirable

• Experience across both a C#/.NET and a TypeScript/Node backend;
• Experience with event-driven or event-streaming systems (Kafka, RabbitMQ, or similar);
• Experience with real-time data and WebSockets/SignalR;
• Experience with containerisation and orchestration (Docker, Kubernetes);
• Experience with CI/CD pipelines and infrastructure-as-code;
• Familiarity with a cloud platform (Azure, AWS, or GCP);
• Experience with testing frameworks (Jest, Playwright, Vitest, or xUnit/NUnit);
• Experience with tRPC, Tailwind CSS, Shadcn/UI, or Next.js App Router.

Salary

Porto - Up to €70,000 per annum

UK - Dependent on experience

The salary varies for this position as we are recruiting in multiple regional locations and job grades. The salary process is based on skills, abilities, and experience required.

What You Can Expect

At Ocean Infinity, we believe in creating equal opportunities for all, celebrating each and everyone's differences. We are driven by transforming the industry, through our technology, thoughts, behaviours and actions. Being inclusive and respectful to all is fundamental to who we are. It is the right thing to do and enables innovation and creativity to thrive.

There is more work to be done, and we know that we aren't perfect, but our commitment to these values is unwavering. They are central to our mission and the impact we have on the industry, meaning, we cannot live without them.