Senior

Spike Posted 147 days ago

Senior Backend Engineer

WebSockets

The job in short

From the ad's data

Spike is hiring: “Senior Backend Engineer” (Senior level). Location: Vilnius. Salary: 4 500–8 000 € per month gross, 23 % above the median for Backend (5 100 € gross). Technologies in the ad: AI, WebSockets. The ad is in English and does not ask for Lithuanian. Spike currently has 3 open IT positions.

Salary

4 500 – 8 000 €/month

Gross/month · +25 % vs the Senior median

Level

Senior

5+ years of experience. You own decisions, architecture and quality, mentor others and see the business context.

Work mode

On-site

Vilnius

What you will do

Optimize the voice AI platform for lower latency and improved scalability using open-source technologies.
Develop interfaces and parallel processing for connecting system components (STT, VAD, LLMs, TTS, external APIs).
Implement data synchronization mechanisms for voice and text streams in parallel workflows.
Create abstraction layers for scalable LLM usage, balancing cost, performance, and accuracy.
Enhance internal tools for system observability, monitoring, and data inspection at scale.
Build integrations to connect clinical workflows with our systems.
Qualifications
At least 4 years in software engineering
Strong analytical and quantitative problem-solving skills, with an aptitude for tackling complex technical challenges.
Proven ability to quickly learn and adapt to new technologies and concepts.
High degree of initiative and a strong sense of ownership over project outcomes.
Good to have (at least one)
Experience with video or audio streaming, or low latency image processing software development
Experience maintaining and scaling websockets
Personal projects demonstrating your mathematical skills
Contributions to open source software

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What they offer

Competitive salary in the range of 4,500 to 8,000 eur gross (and more in exceptional cases) per month depending on your qualifications.
Annual bonus.
Hybrid working model (offices in Vilnius, Lithuania and Palo Alto, CA)
Personal health fund, optical allowance, referral bonus, team events.
Dynamic growth: dive into AI and Data tech, seizing high-growth opportunities with cutting-edge projects.
Talented peers: collaborate with a smart, ambitious team comprising data scientists, PhDs, Cambridge alumni, and tech industry pros (formerly from Bloomberg, Amazon, and Google).
Solid backing: enjoy stability and ample resources for success, supported by market leader Raintree.
At Spike Technologies, diversity is celebrated, and inclusion is our priority. We welcome applicants from all backgrounds to join our innovative team and contribute to our inclusive culture.
Sounds like you? Let's talk.

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Job description

The ad as published by the employer.

Spike Technologies Inc. is a VC-backed hyper growth B2B Agentic AI and health data startup founded in 2022, split between San Francisco, California, and Vilnius, Lithuania. Spike provides a multimodal Voice AI-powered platform designed to eliminate administrative burden in the healthcare industry. The company serves a diverse client base across healthcare, government, digital health and health insurance sector.

In July 2026 Spike Technologies was acquired by Raintree, leading EMR platform in US rehab industry.

As a Software Engineer in Spike AI Engineering team, you will build the systems at the forefront of GenAI and Voice recognition and synthesis for real-time agentic use-cases. You will be operational in optimizing the software for low latency while maintaining flexibility, accuracy, scalability and compliance in Health care workflows.

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Aktyvus Open for 33 more days

Salary

4 500 – 8 000 €/month

Gross, before taxes

+25 % vs Senior median 5 000 €

Top 15 %

Compared with 257 Senior level jobs

Net ≈ 2 723–4 787 €/month. From 6 250 €: social security (Sodra) −1 219 € (19.5 %), income tax (GPM) −1 250 € = 3 781 €. Lithuanian taxes 2026, without the 2nd pension pillar.

Compared with the median +23 %+25 % 6

Whole IT market817 jobs · 4 050 €+54 %
Backend105 jobs · 5 100 €+23 %
Senior level257 jobs · 5 000 €+25 %
Vilnius644 jobs · 4 050 €+55 %
AI203 jobs · 4 550 €+37 %
WebSockets5 jobs · 5 200 €+20 %

IT median +1,3 % per week

Based on 817 active IT jobs with a gross salary on aplikuok.lt, €/month, middle of the range.

Area

Backend

Level

Senior

Work mode

On-site

City

Vilnius

Apply

All company jobs

Source: Unicorns.lt

Open until 2026-11-22

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About the company

Spike

Spike is hiring for 3 IT positions right now, mostly in Backend, Data and AI.

Open roles: 3
Salary median: 6 250 €
Remote or hybrid: 0 %
Cities: Vilnius

Technologies in Spike's ads

WebSockets

IoT

Microservices

Object-Oriented Programming

Python

TypeScript

Spike careers: all jobs 3 →

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