Senior Software Engineer

Date Posted: 31/03/2026

Location: London

Job Type: Full time

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Senior Software Engineer - Full stack

Location: London - hybrid 50%

Contract: Permanent

Hours: Full time- 35 hours

Purpose

We’re looking for a Senior Full Stack Software Engineer to join a cross‑functional squad focused on delivering meaningful customer value across our mobile app and website.

You’ll bring strong, varied engineering experience and a drive to keep learning—whether that’s new languages, technologies or delivery practices. You’re comfortable shaping solutions, working closely with product managers, and making sure we build the right thing in the right way.

You lead by example: hands‑on with the code, supportive of your peers, and able to guide stakeholders. You care about building high‑quality, pragmatic software and contribute to discussions that shape our product and technical direction.

Alongside delivering production‑ready code, you’ll also help grow the team by mentoring and upskilling colleagues.

About Just

We help people achieve a better later life. That’s our purpose and it’s the reason we exist. We are a fast-growing company helping customers enjoy the retirement they deserve. We do this through a variety of market leading, award-winning products and services, delivered by a diverse team of over 1,400 purpose-led colleagues who genuinely put the customer at the heart of everything we do.

This is a brilliant time to join our business. We are on an exciting growth journey to become the UK’s most loved retirement expert.

Key Responsibilities

Providing engineering expertise and experience as a member of a cross functional delivery team, working alongside other engineers, designers, QA, delivery lead and a tech lead
Employ modern development practices to ship high-quality software
Ability to adapt to new languages and frameworks
Choosing the right technology for the job, striving for simplicity
Providing support for digital products once they are live
Pair programming with other members of the team, including designers and QAs
Own the delivery of user stories end-to-end, working within agile principles
Be an advocate for lean software development, building for what is required now
Help break large deliverables into small, lean incremental user stories
Actively contribute to agile ceremonies
Working collaboratively with other engineers within Just to advance our practice across product squads.

What we're looking for (Essential)

Significant full-stack development experience with .Net, TypeScript, React and React Native
Good understanding of HTML, CSS, Tailwind and modern frontend patterns
Proven experience delivering production software and working with APIs and relational databases
Hands‑on experience with Azure and cloud‑native development
Familiarity with containers (Kubernetes/Docker)
Exposure to Infrastructure as Code (Terraform)
Understanding of Git, CI/CD pipelines, and modern release practices
A well‑developed testing mindset (unit, integration, e2e; TDD beneficial)
Experience with observability tools and debugging distributed systems
Effective problem‑solving and system design skills
Comfortable working in agile environments and collaborating with Product and Design
Clear communication skills with the ability to work both independently and as part of a team

What’s in it for you

A competitive salary, pension scheme and life assurance
25 days annual leave plus an additional day on us for your birthday
Private medical cover and income protection, just in case
A generous and highly achievable bonus scheme
Opportunities to progress your career in-role and within the company
Free access to the Headspace app, 24/7 employee assistance helpline and trained physical and mental health first aiders
A variety of employee funded benefits available via our online benefits portal
Plus, several additional purchase options available for you and your loved ones

Explore our full range of benefits on our dedicated benefits page.

Belonging at Just

Valuing diversity of thought and fostering a sense of belonging is critical to our business success, driving innovation and balanced decision making. Our work on DEIB (Diversity, Equity, Inclusion and Belonging) aims to deliver a brilliant employee experience underpinned by a sense of belonging, where our people feel proud to work at Just.

We remain committed to our publicly disclosed HM Treasury Women in Finance Charter and Race at Work Charter targets and support a wide range of employee network and events, championing issues including intergenerational working, social mobility and neurodiversity.

Be Bold. Be Brilliant. Be Just.

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