Senior Software Engineer

Halo Recruiting; Lisboa; On-site; EUR 60,000 - 90,000; Full time

Job summary

Halo Recruiting is a growing technology company building software that helps financial institutions detect financial crime, manage risk, and make faster, better-informed decisions. You will work primarily on backend systems with some frontend contributions, operating with the pace and accountability of a smaller company.

The role focuses on designing, building, testing, and maintaining product features, owning technical work end-to-end, and making architectural decisions that emphasize

Qualifications

• Senior-level software engineering experience with depth in backend product development.
• Strong system-design skills with the ability to explain tradeoffs and long-term implications clearly.
• Experience building and maintaining production software used by real customers.
• Experience contributing to frontend applications, with comfort working across the stack when needed.
• Excellent spoken and written English communication.
• High ownership and initiative: you solve ambiguous problems with minimal direction.

Responsibilities

• Design, build, test, and maintain product features across backend services and selected frontend components.
• Own technical work from problem definition through design, implementation, release, and improvements.
• Make strong architectural decisions involving scalability, reliability, maintainability, security, and performance.
• Modernize existing applications and improve code quality without disrupting critical workflows.
• Partner closely with product managers and engineers to translate business needs into technical solutions.
• Investigate problems independently and move work forward with limited oversight.
• Review code and raise engineering standards within a small, collaborative team.

Skills

Backend development

System design

Production software

Frontend experience

Job description

Join a growing technology company building software that helps financial institutions and global businesses detect financial crime, manage risk, and make faster, better-informed decisions. This is a hands-on product engineering role for someone who can design strong systems, build reliable software, and take ownership without waiting for step-by-step direction.

You will work primarily on backend systems while contributing to frontend development when needed. The teamoperateswith the pace and accountability of a smaller company, so success requires sound judgment, curiosity, and a willingness toidentifywhere you can help most.

What You Will Do

Design, build, test, and maintain product features across backend services and selected frontend components.

Own technical work from problem definition and system design through implementation, release, and ongoing improvement.

Make strong architectural and system-design decisions involving scalability, reliability, maintainability, security, and performance.

Modernize existing applications and improve code quality without disrupting critical business workflows.

Partner closely with product managers and other engineers to turn business needs into practical technical solutions.

Investigate problems independently, propose solutions, and move work forward with limited oversight.

Review code, share technical knowledge, and help raise engineering standards across a small, collaborative team.

Identify useful work, risks, and improvement opportunities instead of waiting to be assigned every next step.

What We Are Looking For

Proven senior-level software engineering experience with deep strength in backend product development.

Very strong system-design skills and the ability to explain technical decisions, tradeoffs, and long‑term consequences clearly.

Experience building and maintaining production software used by real customers.

Experience contributing to frontend applications, with comfort working across the stack when the product requires it.

Excellent spoken and written English, including the ability to communicate complex technical ideas clearly.

A personable, collaborative working style and the confidence to engage directly with technical and non‑technical teammates.

High ownership and initiative: you find the best way to help, solve ambiguous problems, and follow through without constant direction.

Strongly Preferred

Experience working in a startup, scale‑up, or other small‑company environment where engineers take broad ownership.

Experience in fintech, financial services, risk, compliance, payments, or another regulated financial domain.

A record of improving existing systems while continuing to deliver new customer‑facing functionality.

Role Scope

This is a product software engineering position. It is not a data engineering, data science, DevOps, site reliability, or infrastructure role. Candidates should be strongest in application development, backend systems, and system design.

What Success Looks Like

You quickly understand the product, users, and technical landscape.

You make sound system‑design decisions and deliver reliable, maintainable software.

You communicate early when priorities, risks, or tradeoffs are unclear.

You consistently look for the highest‑value way to contribute and help the team move forward.