Senior Algorithms Software Engineer

Sword Health is on a mission to free two billion people from pain. 

With 67% of members achieving a pain-free life and a 70% reduction in surgery intent, at Sword, we are using AI Care to change lives, and save millions for our 25,000+ enterprise clients across three continents. Today, we hold the majority of industry patents, win 70% of competitive evaluations, and have raised more than $300 million from top venture firms like Founders Fund, Sapphire Ventures, General Catalyst, and Khosla Ventures.

Recognized as a Forbes Best Startup Employer in 2025, this award highlights our focus on being a destination for the best and brightest  talent. Not only have we experienced unprecedented growth since our market debut in 2020,  but we’ve also created a remarkable mission and value-driven environment that is loved by our growing team. With a recent valuation of $3 billion, we are in a phase of hyper growth and expansion, and we’re looking for individuals with passion, commitment, and energy to help us scale our global impact. 

Joining Sword means committing to a set of core values, chief amongst them to “do it for the patients” every day, and to always “deliver more than expected” on behalf of our members and clients.

This is an opportunity for you to make a significant difference on a massive scale as you work alongside 900+ (and growing!) talented colleagues, spanning three continents. Your charge? To help us build a pain-free world, powered by AI, enhanced by people — accessible to all.

Algorithms Team:

Our Algorithms team is a versatile Software Engineering team. They build production-ready software for complex problems that require technical and innovative solutions. The team combines:

- software engineering ability;

- technical expertise and versatility - and the ability to learn fast (in fields such as Computer Vision, Signal Processing, Kinematics, Control, Data Science, etc);

- product awareness.

The largest example of their work is the motion tracking and motion analysis engine that enables our AI Care Specialist to guide our members during their exercise sessions:

- providing multi modal real-time feedback;

- collecting valuable movement metrics.

• Work as a part of the Applied Algorithms team, designing and implementing real-time algorithms that power a state of the art guided exercise experience;
• Implement features that include the above algorithms or interact with existing algorithms directly in a large production codebase (Java);
• Write well-designed, efficient, and scalable code and contribute significantly to technical decisions;
• Collaborate with other teams, contributing to requirement definition and ensuring deliverables are aligned with product goals;
• Troubleshoot, debug, maintain code and documentation and create tests and validation processes;
• Iteratively improve the product with data-driven analysis;
• Help grow the team by defining and promoting best practices and mentoring more junior engineers.

• 5+ years of experience in solving complex and ambiguous problems with software in domains such as Mathematics, Data Science, Signal Processing, Control, etc;
• 5+ years of experience in software development, with solid knowledge of design patterns and system design;
• A strong mathematics/engineering background - with the ability to dive deep into complex technical concepts quickly;
• Ability to interface with non-technical stakeholders;
• Ability to visualize and interpret data of different types (tabular, time-series, relational databases, etc.);
• Critical thinking & self-direction, with a results-oriented mindset;
• Willingness and ability to collaborate effectively as a team to reach common goals.

• Experience working in a fast-paced environment and wearing different hats;
• Experience with mobile app development;
• Experience working in projects from ideation to completion and maintenance (including releasing and iterating);
• Experience with game development or machine learning.

• A stimulating, fast-paced environment with lots of room for creativity;
• A bright future at a promising high-tech startup company;
• Career development and growth, with a competitive salary;
• The opportunity to work with a talented team and to add real value to an innovative solution with the potential to change the future of healthcare;
• A flexible environment where you can control your hours (remotely) with unlimited vacation;
• Access to our health and well-being program (digital therapist sessions);
• Remote or Hybrid work policy: We have offices in Porto and Lisbon, so if you want to have face-to-face contact you can always work from there.

Portugal - Sword Benefits & Perks:

• Health, dental and vision insurance

• Meal allowance

• Equity shares

• Remote work allowance

• Flexible working hours

• Work from home

• Discretionary vacation

• Snacks and beverages

• English class

Note: Please note that this position does not offer relocation assistance. Candidates must possess a valid EU visa and be based in Portugal.

Sword Health, which includes SWORD Health, Inc. and Sword Health Professionals (consisting of Sword Health Care Providers, P.A., SWORD Health Care Providers of NJ, P.C., SWORD Health Care Physical Therapy Providers of CA, P.C.*) complies with applicable Federal and State civil rights laws and does not discriminate on the basis of Age, Ancestry, Color, Citizenship, Gender, Gender expression, Gender identity, Gender information, Marital status, Medical condition, National origin, Physical or mental disability, Pregnancy, Race, Religion, Caste, Sexual orientation, and Veteran status.